58 files changed, 4687 insertions, 0 deletions
diff --git a/vendor/fgrosse/phpasn1/CHANGELOG.md b/vendor/fgrosse/phpasn1/CHANGELOG.md
new file mode 100644
index 0000000..e38b982
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/CHANGELOG.md
@@ -0,0 +1,51 @@
+#### v2.3.0 (2021-04)
+* Allow creating an unsigned CSR and adding the signature later
+  https://github.com/fgrosse/PHPASN1/pull/82
+
+#### v2.2.0 (2020-08)
+* support polyfills for bcmath and gmp, and add a composer.json
+  suggestion for the `phpseclib/bcmath_polyfill` for servers unable
+  to install PHP the gmp or bcmath extensions.
+
+#### v.2.1.1 & &v.2.0.2 (2018-12)
+* add stricter validation around some structures, highlighed
+  by wycheproof test suite
+
+#### v.2.1.0 (2018-03)
+* add support for `bcmath` extension (making `gmp` optional)<br>
+  https://github.com/fgrosse/PHPASN1/pull/68
+
+#### v.2.0.1 & v.1.5.3 (2017-12)
+* add .gitattributes file to prevent examples and tests to be installed via composer when --prefer-dist was set
+
+#### v.2.0.0 (2017-08)
+* rename `FG\ASN1\Object` to `FG\ASN1\ASNObject` because `Object` is a special class name in the next major PHP release
+  - when you upgrade you have to adapt all corresponding `use` and `extends` statements as well as type hints and all
+    usages of `Object::fromBinary(…)`.
+*  generally drop PHP 5.6 support
+
+#### v.1.5.2 (2016-10-29)
+* allow empty octet strings
+
+#### v.1.5.1 (2015-10-02)
+* add keywords to composer.json (this is a version on its own so the keywords are found on a stable version at packagist.org)
+
+#### v.1.5.0 (2015-10-30)
+* fix a bug that would prevent you from decoding context specific tags on multiple objects [#57](https://github.com/fgrosse/PHPASN1/issues/57)
+  - `ExplicitlyTaggedObject::__construct` does now accept multiple objects to be tagged with a single tag
+  - `ExplicitlyTaggedObject::getContent` will now always return an array (even if only one object is tagged)
+
+#### v.1.4.2 (2015-09-29)
+* fix a bug that would prevent you from decoding empty tagged objects [#57](https://github.com/fgrosse/PHPASN1/issues/57)
+
+#### v.1.4.1
+* improve exception messages and general error handling [#55](https://github.com/fgrosse/PHPASN1/pull/55)
+
+#### v.1.4.0
+* **require PHP 5.6**
+* support big integers (closes #1 and #37)
+* enforce one code style via [styleci.io][9]
+* track code coverage via [coveralls.io][10]
+* replace obsolete `FG\ASN1\Exception\GeneralException` with `\Exception`
+* `Construct` (`Sequence`, `Set`) does now implement `ArrayAccess`, `Countable` and `Iterator` so its easier to use
+* add [`TemplateParser`][11]
diff --git a/vendor/fgrosse/phpasn1/LICENSE b/vendor/fgrosse/phpasn1/LICENSE
new file mode 100644
index 0000000..1e17eb0
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2012-2015 Friedrich Große <friedrich.grosse@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/fgrosse/phpasn1/README.md b/vendor/fgrosse/phpasn1/README.md
new file mode 100644
index 0000000..3931010
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/README.md
@@ -0,0 +1,167 @@
+PHPASN1
+=======
+
+[![Build Status](https://secure.travis-ci.org/fgrosse/PHPASN1.png?branch=master)](http://travis-ci.org/fgrosse/PHPASN1)
+[![PHP 7 ready](http://php7ready.timesplinter.ch/fgrosse/PHPASN1/badge.svg)](https://travis-ci.org/fgrosse/PHPASN1)
+[![Coverage Status](https://coveralls.io/repos/fgrosse/PHPASN1/badge.svg?branch=master&service=github)](https://coveralls.io/github/fgrosse/PHPASN1?branch=master)
+
+[![Latest Stable Version](https://poser.pugx.org/fgrosse/phpasn1/v/stable.png)](https://packagist.org/packages/fgrosse/phpasn1)
+[![Total Downloads](https://poser.pugx.org/fgrosse/phpasn1/downloads.png)](https://packagist.org/packages/fgrosse/phpasn1)
+[![Latest Unstable Version](https://poser.pugx.org/fgrosse/phpasn1/v/unstable.png)](https://packagist.org/packages/fgrosse/phpasn1)
+[![License](https://poser.pugx.org/fgrosse/phpasn1/license.png)](https://packagist.org/packages/fgrosse/phpasn1)
+
+A PHP Framework that allows you to encode and decode arbitrary [ASN.1][3] structures
+using the [ITU-T X.690 Encoding Rules][4].
+This encoding is very frequently used in [X.509 PKI environments][5] or the communication between heterogeneous computer systems.
+
+The API allows you to encode ASN.1 structures to create binary data such as certificate
+signing requests (CSR), X.509 certificates or certificate revocation lists (CRL).
+PHPASN1 can also read [BER encoded][6] binary data into separate PHP objects that can be manipulated by the user and reencoded afterwards.
+
+The **changelog** can now be found at [CHANGELOG.md](CHANGELOG.md).
+
+## Dependencies
+
+PHPASN1 requires at least `PHP 7.0` and either the `gmp` or `bcmath` extension.
+Support for older PHP versions (i.e. PHP 5.6) was dropped starting with `v2.0`.
+If you must use an outdated PHP version consider using [PHPASN v1.5][13].
+
+For the loading of object identifier names directly from the web [curl][7] is used.
+
+## Installation
+
+The preferred way to install this library is to rely on [Composer][2]:
+
+```bash
+$ composer require fgrosse/phpasn1
+```
+
+## Usage
+
+### Encoding ASN.1 Structures
+
+PHPASN1 offers you a class for each of the implemented ASN.1 universal types.
+The constructors should be pretty self explanatory so you should have no big trouble getting started.
+All data will be encoded using [DER encoding][8]
+
+```php
+use FG\ASN1\OID;
+use FG\ASN1\Universal\Integer;
+use FG\ASN1\Universal\Boolean;
+use FG\ASN1\Universal\Enumerated;
+use FG\ASN1\Universal\IA5String;
+use FG\ASN1\Universal\ObjectIdentifier;
+use FG\ASN1\Universal\PrintableString;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\NullObject;
+
+$integer = new Integer(123456);        
+$boolean = new Boolean(true);
+$enum = new Enumerated(1);
+$ia5String = new IA5String('Hello world');
+
+$asnNull = new NullObject();
+$objectIdentifier1 = new ObjectIdentifier('1.2.250.1.16.9');
+$objectIdentifier2 = new ObjectIdentifier(OID::RSA_ENCRYPTION);
+$printableString = new PrintableString('Foo bar');
+
+$sequence = new Sequence($integer, $boolean, $enum, $ia5String);
+$set = new Set($sequence, $asnNull, $objectIdentifier1, $objectIdentifier2, $printableString);
+
+$myBinary  = $sequence->getBinary();
+$myBinary .= $set->getBinary();
+
+echo base64_encode($myBinary);
+```
+
+
+### Decoding binary data
+
+Decoding BER encoded binary data is just as easy as encoding it:
+
+```php
+use FG\ASN1\ASNObject;
+
+$base64String = ...
+$binaryData = base64_decode($base64String);        
+$asnObject = ASNObject::fromBinary($binaryData);
+
+
+// do stuff
+```
+
+If you already know exactly how your expected data should look like you can use the `FG\ASN1\TemplateParser`:
+
+```php
+use FG\ASN1\TemplateParser;
+
+// first define your template
+$template = [
+    Identifier::SEQUENCE => [
+        Identifier::SET => [
+            Identifier::OBJECT_IDENTIFIER,
+            Identifier::SEQUENCE => [
+                Identifier::INTEGER,
+                Identifier::BITSTRING,
+            ]
+        ]
+    ]
+];
+
+// if your binary data is not matching the template you provided this will throw an `\Exception`:
+$parser = new TemplateParser();
+$object = $parser->parseBinary($data, $template);
+
+// there is also a convenience function if you parse binary data from base64:
+$object = $parser->parseBase64($data, $template);
+```
+
+You can use this function to make sure your data has exactly the format you are expecting.
+
+### Navigating decoded data
+
+All constructed classes (i.e. `Sequence` and `Set`) can be navigated by array access or using an iterator.
+You can find examples
+[here](https://github.com/fgrosse/PHPASN1/blob/f6442cadda9d36f3518c737e32f28300a588b777/tests/ASN1/Universal/SequenceTest.php#L148-148),
+[here](https://github.com/fgrosse/PHPASN1/blob/f6442cadda9d36f3518c737e32f28300a588b777/tests/ASN1/Universal/SequenceTest.php#L121) and 
+[here](https://github.com/fgrosse/PHPASN1/blob/f6442cadda9d36f3518c737e32f28300a588b777/tests/ASN1/TemplateParserTest.php#L45).
+
+
+### Give me more examples!
+
+To see some example usage of the API classes or some generated output check out the [examples](https://github.com/fgrosse/PHPASN1/tree/master/examples).
+
+
+### How do I contribute?
+
+If you found an issue or have a question submit a github issue with detailed information.
+
+In case you already know what caused the issue and feel in the mood to fix it, your code contributions are always welcome. Just fork the repository, implement your changes and make sure that you covered everything with tests.
+Afterwards submit a pull request via github and be a little patient :) I usually try to comment and/or merge as soon as possible.
+
+#### Mailing list
+
+New features or questions can be discussed in [this google group/mailing list][12].
+
+### Thanks
+
+To [all contributors][1] so far!
+
+## License
+
+This library is distributed under the [MIT License](LICENSE).
+
+[1]: https://github.com/fgrosse/PHPASN1/graphs/contributors
+[2]: https://getcomposer.org/
+[3]: http://www.itu.int/ITU-T/asn1/
+[4]: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=x.690
+[5]: http://en.wikipedia.org/wiki/X.509
+[6]: http://en.wikipedia.org/wiki/X.690#BER_encoding
+[7]: http://php.net/manual/en/book.curl.php
+[8]: http://en.wikipedia.org/wiki/X.690#DER_encoding
+[9]: https://styleci.io
+[10]: https://coveralls.io/github/fgrosse/PHPASN1
+[11]: https://github.com/fgrosse/PHPASN1/blob/master/tests/ASN1/TemplateParserTest.php#L16
+[12]: https://groups.google.com/d/forum/phpasn1
+[13]: https://packagist.org/packages/fgrosse/phpasn1#1.5.2
diff --git a/vendor/fgrosse/phpasn1/composer.json b/vendor/fgrosse/phpasn1/composer.json
new file mode 100644
index 0000000..01ffada
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/composer.json
@@ -0,0 +1,49 @@
+{
+    "name": "fgrosse/phpasn1",
+    "description": "A PHP Framework that allows you to encode and decode arbitrary ASN.1 structures using the ITU-T X.690 Encoding Rules.",
+    "type": "library",
+    "homepage": "https://github.com/FGrosse/PHPASN1",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Friedrich Große",
+            "email": "friedrich.grosse@gmail.com",
+            "homepage": "https://github.com/FGrosse",
+            "role": "Author"
+        },
+        {
+            "name": "All contributors",
+            "homepage": "https://github.com/FGrosse/PHPASN1/contributors"
+        }
+    ],
+    "keywords": [ "x690", "x.690", "x.509", "x509", "asn1", "asn.1", "ber", "der", "binary", "encoding", "decoding" ],
+
+    "require": {
+        "php": ">=7.0.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~6.3",
+        "satooshi/php-coveralls": "~2.0"
+    },
+    "suggest": {
+        "ext-gmp": "GMP is the preferred extension for big integer calculations",
+        "ext-bcmath": "BCmath is the fallback extension for big integer calculations",
+        "phpseclib/bcmath_compat": "BCmath polyfill for servers where neither GMP nor BCmath is available",
+        "ext-curl": "For loading OID information from the web if they have not bee defined statically"
+    },
+    "autoload": {
+        "psr-4": {
+            "FG\\": "lib/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "FG\\Test\\": "tests/"
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php
new file mode 100644
index 0000000..3b7f162
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php
@@ -0,0 +1,355 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\Boolean;
+use FG\ASN1\Universal\Enumerated;
+use FG\ASN1\Universal\GeneralizedTime;
+use FG\ASN1\Universal\Integer;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\ObjectIdentifier;
+use FG\ASN1\Universal\RelativeObjectIdentifier;
+use FG\ASN1\Universal\OctetString;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\UTCTime;
+use FG\ASN1\Universal\IA5String;
+use FG\ASN1\Universal\PrintableString;
+use FG\ASN1\Universal\NumericString;
+use FG\ASN1\Universal\UTF8String;
+use FG\ASN1\Universal\UniversalString;
+use FG\ASN1\Universal\CharacterString;
+use FG\ASN1\Universal\GeneralString;
+use FG\ASN1\Universal\VisibleString;
+use FG\ASN1\Universal\GraphicString;
+use FG\ASN1\Universal\BMPString;
+use FG\ASN1\Universal\T61String;
+use FG\ASN1\Universal\ObjectDescriptor;
+use FG\Utility\BigInteger;
+use LogicException;
+
+/**
+ * Class ASNObject is the base class for all concrete ASN.1 objects.
+ */
+abstract class ASNObject implements Parsable
+{
+    private $contentLength;
+    private $nrOfLengthOctets;
+
+    /**
+     * Must return the number of octets of the content part.
+     *
+     * @return int
+     */
+    abstract protected function calculateContentLength();
+
+    /**
+     * Encode the object using DER encoding.
+     *
+     * @see http://en.wikipedia.org/wiki/X.690#DER_encoding
+     *
+     * @return string the binary representation of an objects value
+     */
+    abstract protected function getEncodedValue();
+
+    /**
+     * Return the content of this object in a non encoded form.
+     * This can be used to print the value in human readable form.
+     *
+     * @return mixed
+     */
+    abstract public function getContent();
+
+    /**
+     * Return the object type octet.
+     * This should use the class constants of Identifier.
+     *
+     * @see Identifier
+     *
+     * @return int
+     */
+    abstract public function getType();
+
+    /**
+     * Returns all identifier octets. If an inheriting class models a tag with
+     * the long form identifier format, it MUST reimplement this method to
+     * return all octets of the identifier.
+     *
+     * @throws LogicException If the identifier format is long form
+     *
+     * @return string Identifier as a set of octets
+     */
+    public function getIdentifier()
+    {
+        $firstOctet = $this->getType();
+
+        if (Identifier::isLongForm($firstOctet)) {
+            throw new LogicException(sprintf('Identifier of %s uses the long form and must therefor override "ASNObject::getIdentifier()".', get_class($this)));
+        }
+
+        return chr($firstOctet);
+    }
+
+    /**
+     * Encode this object using DER encoding.
+     *
+     * @return string the full binary representation of the complete object
+     */
+    public function getBinary()
+    {
+        $result  = $this->getIdentifier();
+        $result .= $this->createLengthPart();
+        $result .= $this->getEncodedValue();
+
+        return $result;
+    }
+
+    private function createLengthPart()
+    {
+        $contentLength = $this->getContentLength();
+        $nrOfLengthOctets = $this->getNumberOfLengthOctets($contentLength);
+
+        if ($nrOfLengthOctets == 1) {
+            return chr($contentLength);
+        } else {
+            // the first length octet determines the number subsequent length octets
+            $lengthOctets = chr(0x80 | ($nrOfLengthOctets - 1));
+            for ($shiftLength = 8 * ($nrOfLengthOctets - 2); $shiftLength >= 0; $shiftLength -= 8) {
+                $lengthOctets .= chr($contentLength >> $shiftLength);
+            }
+
+            return $lengthOctets;
+        }
+    }
+
+    protected function getNumberOfLengthOctets($contentLength = null)
+    {
+        if (!isset($this->nrOfLengthOctets)) {
+            if ($contentLength == null) {
+                $contentLength = $this->getContentLength();
+            }
+
+            $this->nrOfLengthOctets = 1;
+            if ($contentLength > 127) {
+                do { // long form
+                    $this->nrOfLengthOctets++;
+                    $contentLength = $contentLength >> 8;
+                } while ($contentLength > 0);
+            }
+        }
+
+        return $this->nrOfLengthOctets;
+    }
+
+    protected function getContentLength()
+    {
+        if (!isset($this->contentLength)) {
+            $this->contentLength = $this->calculateContentLength();
+        }
+
+        return $this->contentLength;
+    }
+
+    protected function setContentLength($newContentLength)
+    {
+        $this->contentLength = $newContentLength;
+        $this->getNumberOfLengthOctets($newContentLength);
+    }
+
+    /**
+     * Returns the length of the whole object (including the identifier and length octets).
+     */
+    public function getObjectLength()
+    {
+        $nrOfIdentifierOctets = strlen($this->getIdentifier());
+        $contentLength = $this->getContentLength();
+        $nrOfLengthOctets = $this->getNumberOfLengthOctets($contentLength);
+
+        return $nrOfIdentifierOctets + $nrOfLengthOctets + $contentLength;
+    }
+
+    public function __toString()
+    {
+        return $this->getContent();
+    }
+
+    /**
+     * Returns the name of the ASN.1 Type of this object.
+     *
+     * @see Identifier::getName()
+     */
+    public function getTypeName()
+    {
+        return Identifier::getName($this->getType());
+    }
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws ParserException
+     *
+     * @return \FG\ASN1\ASNObject
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse binary from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $identifierOctet = ord($binaryData[$offsetIndex]);
+        if (Identifier::isContextSpecificClass($identifierOctet) && Identifier::isConstructed($identifierOctet)) {
+            return ExplicitlyTaggedObject::fromBinary($binaryData, $offsetIndex);
+        }
+
+        switch ($identifierOctet) {
+            case Identifier::BITSTRING:
+                return BitString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::BOOLEAN:
+                return Boolean::fromBinary($binaryData, $offsetIndex);
+            case Identifier::ENUMERATED:
+                return Enumerated::fromBinary($binaryData, $offsetIndex);
+            case Identifier::INTEGER:
+                return Integer::fromBinary($binaryData, $offsetIndex);
+            case Identifier::NULL:
+                return NullObject::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OBJECT_IDENTIFIER:
+                return ObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            case Identifier::RELATIVE_OID:
+                return RelativeObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OCTETSTRING:
+                return OctetString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::SEQUENCE:
+                return Sequence::fromBinary($binaryData, $offsetIndex);
+            case Identifier::SET:
+                return Set::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UTC_TIME:
+                return UTCTime::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GENERALIZED_TIME:
+                return GeneralizedTime::fromBinary($binaryData, $offsetIndex);
+            case Identifier::IA5_STRING:
+                return IA5String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::PRINTABLE_STRING:
+                return PrintableString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::NUMERIC_STRING:
+                return NumericString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UTF8_STRING:
+                return UTF8String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UNIVERSAL_STRING:
+                return UniversalString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::CHARACTER_STRING:
+                return CharacterString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GENERAL_STRING:
+                return GeneralString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::VISIBLE_STRING:
+                return VisibleString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GRAPHIC_STRING:
+                return GraphicString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::BMP_STRING:
+                return BMPString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::T61_STRING:
+                return T61String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OBJECT_DESCRIPTOR:
+                return ObjectDescriptor::fromBinary($binaryData, $offsetIndex);
+            default:
+                // At this point the identifier may be >1 byte.
+                if (Identifier::isConstructed($identifierOctet)) {
+                    return new UnknownConstructedObject($binaryData, $offsetIndex);
+                } else {
+                    $identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+                    $lengthOfUnknownObject = self::parseContentLength($binaryData, $offsetIndex);
+                    $offsetIndex += $lengthOfUnknownObject;
+
+                    return new UnknownObject($identifier, $lengthOfUnknownObject);
+                }
+        }
+    }
+
+    protected static function parseIdentifier($identifierOctet, $expectedIdentifier, $offsetForExceptionHandling)
+    {
+        if (is_string($identifierOctet) || is_numeric($identifierOctet) == false) {
+            $identifierOctet = ord($identifierOctet);
+        }
+
+        if ($identifierOctet != $expectedIdentifier) {
+            $message = 'Can not create an '.Identifier::getName($expectedIdentifier).' from an '.Identifier::getName($identifierOctet);
+            throw new ParserException($message, $offsetForExceptionHandling);
+        }
+    }
+
+    protected static function parseBinaryIdentifier($binaryData, &$offsetIndex)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse identifier from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $identifier = $binaryData[$offsetIndex++];
+
+        if (Identifier::isLongForm(ord($identifier)) == false) {
+            return $identifier;
+        }
+
+        while (true) {
+            if (strlen($binaryData) <= $offsetIndex) {
+                throw new ParserException('Can not parse identifier (long form) from data: Offset index larger than input size', $offsetIndex);
+            }
+            $nextOctet = $binaryData[$offsetIndex++];
+            $identifier .= $nextOctet;
+
+            if ((ord($nextOctet) & 0x80) === 0) {
+                // the most significant bit is 0 to we have reached the end of the identifier
+                break;
+            }
+        }
+
+        return $identifier;
+    }
+
+    protected static function parseContentLength(&$binaryData, &$offsetIndex, $minimumLength = 0)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse content length from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $contentLength = ord($binaryData[$offsetIndex++]);
+        if (($contentLength & 0x80) != 0) {
+            // bit 8 is set -> this is the long form
+            $nrOfLengthOctets = $contentLength & 0x7F;
+            $contentLength = BigInteger::create(0x00);
+            for ($i = 0; $i < $nrOfLengthOctets; $i++) {
+                if (strlen($binaryData) <= $offsetIndex) {
+                    throw new ParserException('Can not parse content length (long form) from data: Offset index larger than input size', $offsetIndex);
+                }
+                $contentLength = $contentLength->shiftLeft(8)->add(ord($binaryData[$offsetIndex++]));
+            }
+
+            if ($contentLength->compare(PHP_INT_MAX) > 0) {
+                throw new ParserException("Can not parse content length from data: length > maximum integer", $offsetIndex);
+            }
+
+            $contentLength = $contentLength->toInteger();
+        }
+
+        if ($contentLength < $minimumLength) {
+            throw new ParserException('A '.get_called_class()." should have a content length of at least {$minimumLength}. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $lenDataRemaining = strlen($binaryData) - $offsetIndex;
+
+        if ($lenDataRemaining < $contentLength) {
+            throw new ParserException("Content length {$contentLength} exceeds remaining data length {$lenDataRemaining}", $offsetIndex);
+        }
+
+        return $contentLength;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php
new file mode 100644
index 0000000..7e0d7dd
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php
@@ -0,0 +1,136 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+
+abstract class AbstractString extends ASNObject implements Parsable
+{
+    /** @var string */
+    protected $value;
+    private $checkStringForIllegalChars = true;
+    private $allowedCharacters = [];
+
+    /**
+     * The abstract base class for ASN.1 classes which represent some string of character.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function allowCharacter($character)
+    {
+        $this->allowedCharacters[] = $character;
+    }
+
+    protected function allowCharacters(...$characters)
+    {
+        foreach ($characters as $character) {
+            $this->allowedCharacters[] = $character;
+        }
+    }
+
+    protected function allowNumbers()
+    {
+        foreach (range('0', '9') as $char) {
+            $this->allowedCharacters[] = (string) $char;
+        }
+    }
+
+    protected function allowAllLetters()
+    {
+        $this->allowSmallLetters();
+        $this->allowCapitalLetters();
+    }
+
+    protected function allowSmallLetters()
+    {
+        foreach (range('a', 'z') as $char) {
+            $this->allowedCharacters[] = $char;
+        }
+    }
+
+    protected function allowCapitalLetters()
+    {
+        foreach (range('A', 'Z') as $char) {
+            $this->allowedCharacters[] = $char;
+        }
+    }
+
+    protected function allowSpaces()
+    {
+        $this->allowedCharacters[] = ' ';
+    }
+
+    protected function allowAll()
+    {
+        $this->checkStringForIllegalChars = false;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->value);
+    }
+
+    protected function getEncodedValue()
+    {
+        if ($this->checkStringForIllegalChars) {
+            $this->checkString();
+        }
+
+        return $this->value;
+    }
+
+    protected function checkString()
+    {
+        $stringLength = $this->getContentLength();
+        for ($i = 0; $i < $stringLength; $i++) {
+            if (in_array($this->value[$i], $this->allowedCharacters) == false) {
+                $typeName = Identifier::getName($this->getType());
+                throw new Exception("Could not create a {$typeName} from the character sequence '{$this->value}'.");
+            }
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static('');
+
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $string = substr($binaryData, $offsetIndex, $contentLength);
+        $offsetIndex += $contentLength;
+
+        $parsedObject->value = $string;
+        $parsedObject->setContentLength($contentLength);
+        return $parsedObject;
+    }
+
+    public static function isValid($string)
+    {
+        $testObject = new static($string);
+        try {
+            $testObject->checkString();
+
+            return true;
+        } catch (Exception $exception) {
+            return false;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php
new file mode 100644
index 0000000..9fad505
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php
@@ -0,0 +1,78 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use DateInterval;
+use DateTime;
+use DateTimeZone;
+use Exception;
+
+abstract class AbstractTime extends ASNObject
+{
+    /** @var DateTime */
+    protected $value;
+
+    public function __construct($dateTime = null, $dateTimeZone = 'UTC')
+    {
+        if ($dateTime == null || is_string($dateTime)) {
+            $timeZone = new DateTimeZone($dateTimeZone);
+            $dateTimeObject = new DateTime($dateTime, $timeZone);
+            if ($dateTimeObject == false) {
+                $errorMessage = $this->getLastDateTimeErrors();
+                $className = Identifier::getName($this->getType());
+                throw new Exception(sprintf("Could not create %s from date time string '%s': %s", $className, $dateTime, $errorMessage));
+            }
+            $dateTime = $dateTimeObject;
+        } elseif (!$dateTime instanceof DateTime) {
+            throw new Exception('Invalid first argument for some instance of AbstractTime constructor');
+        }
+
+        $this->value = $dateTime;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function getLastDateTimeErrors()
+    {
+        $messages = '';
+        $lastErrors = DateTime::getLastErrors();
+        foreach ($lastErrors['errors'] as $errorMessage) {
+            $messages .= "{$errorMessage}, ";
+        }
+
+        return substr($messages, 0, -2);
+    }
+
+    public function __toString()
+    {
+        return $this->value->format("Y-m-d\tH:i:s");
+    }
+
+    protected static function extractTimeZoneData(&$binaryData, &$offsetIndex, DateTime $dateTime)
+    {
+        $sign = $binaryData[$offsetIndex++];
+        $timeOffsetHours   = intval(substr($binaryData, $offsetIndex, 2));
+        $timeOffsetMinutes = intval(substr($binaryData, $offsetIndex + 2, 2));
+        $offsetIndex += 4;
+
+        $interval = new DateInterval("PT{$timeOffsetHours}H{$timeOffsetMinutes}M");
+        if ($sign == '+') {
+            $dateTime->sub($interval);
+        } else {
+            $dateTime->add($interval);
+        }
+
+        return $dateTime;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php b/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php
new file mode 100644
index 0000000..119ee7b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace FG\ASN1;
+
+use FG\Utility\BigInteger;
+use InvalidArgumentException;
+
+/**
+ * A base-128 decoder.
+ */
+class Base128
+{
+    /**
+     * @param int $value
+     *
+     * @return string
+     */
+    public static function encode($value)
+    {
+        $value = BigInteger::create($value);
+        $octets = chr($value->modulus(0x80)->toInteger());
+
+        $value = $value->shiftRight(7);
+        while ($value->compare(0) > 0) {
+            $octets .= chr(0x80 | $value->modulus(0x80)->toInteger());
+            $value = $value->shiftRight(7);
+        }
+
+        return strrev($octets);
+    }
+
+    /**
+     * @param string $octets
+     *
+     * @throws InvalidArgumentException if the given octets represent a malformed base-128 value or the decoded value would exceed the the maximum integer length
+     *
+     * @return int
+     */
+    public static function decode($octets)
+    {
+        $bitsPerOctet = 7;
+        $value = BigInteger::create(0);
+        $i = 0;
+
+        while (true) {
+            if (!isset($octets[$i])) {
+                throw new InvalidArgumentException(sprintf('Malformed base-128 encoded value (0x%s).', strtoupper(bin2hex($octets)) ?: '0'));
+            }
+
+            $octet = ord($octets[$i++]);
+
+            $l1 = $value->shiftLeft($bitsPerOctet);
+            $r1 = $octet & 0x7f;
+            $value = $l1->add($r1);
+
+            if (0 === ($octet & 0x80)) {
+                break;
+            }
+        }
+
+        return (string)$value;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php
new file mode 100644
index 0000000..3f4027c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class AttributeTypeAndValue extends Sequence
+{
+    /**
+     * @param ObjectIdentifier|string $objIdentifier
+     * @param \FG\ASN1\ASNObject $value
+     */
+    public function __construct($objIdentifier, ASNObject $value)
+    {
+        if ($objIdentifier instanceof ObjectIdentifier == false) {
+            $objIdentifier = new ObjectIdentifier($objIdentifier);
+        }
+        parent::__construct($objIdentifier, $value);
+    }
+
+    public function __toString()
+    {
+        return $this->children[0].': '.$this->children[1];
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php
new file mode 100644
index 0000000..e95e7ac
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php
@@ -0,0 +1,37 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\Universal\PrintableString;
+use FG\ASN1\Universal\IA5String;
+use FG\ASN1\Universal\UTF8String;
+
+class RDNString extends RelativeDistinguishedName
+{
+    /**
+     * @param string|\FG\ASN1\Universal\ObjectIdentifier $objectIdentifierString
+     * @param string|\FG\ASN1\ASNObject $value
+     */
+    public function __construct($objectIdentifierString, $value)
+    {
+        if (PrintableString::isValid($value)) {
+            $value = new PrintableString($value);
+        } else {
+            if (IA5String::isValid($value)) {
+                $value = new IA5String($value);
+            } else {
+                $value = new UTF8String($value);
+            }
+        }
+
+        parent::__construct($objectIdentifierString, $value);
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php
new file mode 100644
index 0000000..4185f41
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php
@@ -0,0 +1,50 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\Exception\NotImplementedException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Universal\Set;
+
+class RelativeDistinguishedName extends Set
+{
+    /**
+     * @param string|\FG\ASN1\Universal\ObjectIdentifier $objIdentifierString
+     * @param \FG\ASN1\ASNObject $value
+     */
+    public function __construct($objIdentifierString, ASNObject $value)
+    {
+        // TODO: This does only support one element in the RelativeDistinguishedName Set but it it is defined as follows:
+        // RelativeDistinguishedName ::= SET SIZE (1..MAX) OF AttributeTypeAndValue
+        parent::__construct(new AttributeTypeAndValue($objIdentifierString, $value));
+    }
+
+    public function getContent()
+    {
+        /** @var \FG\ASN1\ASNObject $firstObject */
+        $firstObject = $this->children[0];
+        return $firstObject->__toString();
+    }
+
+    /**
+     * At the current version this code can not work since the implementation of Construct requires
+     * the class to support a constructor without arguments.
+     *
+     * @deprecated this function is not yet implemented! Feel free to submit a pull request on github
+     * @param string $binaryData
+     * @param int $offsetIndex
+     * @throws NotImplementedException
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        throw new NotImplementedException();
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php b/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php
new file mode 100644
index 0000000..58f9613
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php
@@ -0,0 +1,191 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use ArrayAccess;
+use ArrayIterator;
+use Countable;
+use FG\ASN1\Exception\ParserException;
+use Iterator;
+
+abstract class Construct extends ASNObject implements Countable, ArrayAccess, Iterator, Parsable
+{
+    /** @var \FG\ASN1\ASNObject[] */
+    protected $children;
+    private $iteratorPosition;
+
+    /**
+     * @param \FG\ASN1\ASNObject[] $children the variadic type hint is commented due to https://github.com/facebook/hhvm/issues/4858
+     */
+    public function __construct(/* HH_FIXME[4858]: variadic + strict */ ...$children)
+    {
+        $this->children = $children;
+        $this->iteratorPosition = 0;
+    }
+
+    public function getContent()
+    {
+        return $this->children;
+    }
+
+    public function rewind()
+    {
+        $this->iteratorPosition = 0;
+    }
+
+    public function current()
+    {
+        return $this->children[$this->iteratorPosition];
+    }
+
+    public function key()
+    {
+        return $this->iteratorPosition;
+    }
+
+    public function next()
+    {
+        $this->iteratorPosition++;
+    }
+
+    public function valid()
+    {
+        return isset($this->children[$this->iteratorPosition]);
+    }
+
+    public function offsetExists($offset)
+    {
+        return array_key_exists($offset, $this->children);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->children[$offset];
+    }
+
+    public function offsetSet($offset, $value)
+    {
+        if ($offset === null) {
+            $offset = count($this->children);
+        }
+
+        $this->children[$offset] = $value;
+    }
+
+    public function offsetUnset($offset)
+    {
+        unset($this->children[$offset]);
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->children as $component) {
+            $length += $component->getObjectLength();
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $result = '';
+        foreach ($this->children as $component) {
+            $result .= $component->getBinary();
+        }
+
+        return $result;
+    }
+
+    public function addChild(ASNObject $child)
+    {
+        $this->children[] = $child;
+    }
+
+    public function addChildren(array $children)
+    {
+        foreach ($children as $child) {
+            $this->addChild($child);
+        }
+    }
+
+    public function __toString()
+    {
+        $nrOfChildren = $this->getNumberOfChildren();
+        $childString = $nrOfChildren == 1 ? 'child' : 'children';
+
+        return "[{$nrOfChildren} {$childString}]";
+    }
+
+    public function getNumberOfChildren()
+    {
+        return count($this->children);
+    }
+
+    /**
+     * @return \FG\ASN1\ASNObject[]
+     */
+    public function getChildren()
+    {
+        return $this->children;
+    }
+
+    /**
+     * @return \FG\ASN1\ASNObject
+     */
+    public function getFirstChild()
+    {
+        return $this->children[0];
+    }
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws Exception\ParserException
+     *
+     * @return Construct|static
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static();
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $startIndex = $offsetIndex;
+
+        $children = [];
+        $octetsToRead = $contentLength;
+        while ($octetsToRead > 0) {
+            $newChild = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $newChild->getObjectLength();
+            $children[] = $newChild;
+        }
+
+        if ($octetsToRead !== 0) {
+            throw new ParserException("Sequence length incorrect", $startIndex);
+        }
+
+        $parsedObject->addChildren($children);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+
+    public function count($mode = COUNT_NORMAL)
+    {
+        return count($this->children, $mode);
+    }
+
+    public function getIterator()
+    {
+        return new ArrayIterator($this->children);
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php
new file mode 100644
index 0000000..c9f8e82
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php
@@ -0,0 +1,15 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Exception;
+
+class NotImplementedException extends \Exception
+{
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php
new file mode 100644
index 0000000..4bda4e8
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php
@@ -0,0 +1,29 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Exception;
+
+class ParserException extends \Exception
+{
+    private $errorMessage;
+    private $offset;
+
+    public function __construct($errorMessage, $offset)
+    {
+        $this->errorMessage = $errorMessage;
+        $this->offset = $offset;
+        parent::__construct("ASN.1 Parser Exception at offset {$this->offset}: {$this->errorMessage}");
+    }
+
+    public function getOffset()
+    {
+        return $this->offset;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php
new file mode 100644
index 0000000..b947a95
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php
@@ -0,0 +1,131 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * Class ExplicitlyTaggedObject decorate an inner object with an additional tag that gives information about
+ * its context specific meaning.
+ *
+ * Explanation taken from A Layman's Guide to a Subset of ASN.1, BER, and DER:
+ * >>> An RSA Laboratories Technical Note
+ * >>> Burton S. Kaliski Jr.
+ * >>> Revised November 1, 1993
+ *
+ * [...]
+ * Explicitly tagged types are derived from other types by adding an outer tag to the underlying type.
+ * In effect, explicitly tagged types are structured types consisting of one component, the underlying type.
+ * Explicit tagging is denoted by the ASN.1 keywords [class number] EXPLICIT (see Section 5.2).
+ * [...]
+ *
+ * @see http://luca.ntop.org/Teaching/Appunti/asn1.html
+ */
+class ExplicitlyTaggedObject extends ASNObject
+{
+    /** @var \FG\ASN1\ASNObject[] */
+    private $decoratedObjects;
+    private $tag;
+
+    /**
+     * @param int $tag
+     * @param \FG\ASN1\ASNObject $objects,...
+     */
+    public function __construct($tag, /* HH_FIXME[4858]: variadic + strict */ ...$objects)
+    {
+        $this->tag = $tag;
+        $this->decoratedObjects = $objects;
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->decoratedObjects as $object) {
+            $length += $object->getObjectLength();
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encoded = '';
+        foreach ($this->decoratedObjects as $object) {
+            $encoded .= $object->getBinary();
+        }
+
+        return $encoded;
+    }
+
+    public function getContent()
+    {
+        return $this->decoratedObjects;
+    }
+
+    public function __toString()
+    {
+        switch ($length = count($this->decoratedObjects)) {
+        case 0:
+            return "Context specific empty object with tag [{$this->tag}]";
+        case 1:
+            $decoratedType = Identifier::getShortName($this->decoratedObjects[0]->getType());
+            return "Context specific $decoratedType with tag [{$this->tag}]";
+        default:
+            return "$length context specific objects with tag [{$this->tag}]";
+        }
+    }
+
+    public function getType()
+    {
+        return ord($this->getIdentifier());
+    }
+
+    public function getIdentifier()
+    {
+        $identifier = Identifier::create(Identifier::CLASS_CONTEXT_SPECIFIC, true, $this->tag);
+
+        return is_int($identifier) ? chr($identifier) : $identifier;
+    }
+
+    public function getTag()
+    {
+        return $this->tag;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+        $firstIdentifierOctet = ord($identifier);
+        assert(Identifier::isContextSpecificClass($firstIdentifierOctet), 'identifier octet should indicate context specific class');
+        assert(Identifier::isConstructed($firstIdentifierOctet), 'identifier octet should indicate constructed object');
+        $tag = Identifier::getTagNumber($identifier);
+
+        $totalContentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $remainingContentLength = $totalContentLength;
+
+        $offsetIndexOfDecoratedObject = $offsetIndex;
+        $decoratedObjects = [];
+
+        while ($remainingContentLength > 0) {
+            $nextObject = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $remainingContentLength -= $nextObject->getObjectLength();
+            $decoratedObjects[] = $nextObject;
+        }
+
+        if ($remainingContentLength != 0) {
+            throw new ParserException("Context-Specific explicitly tagged object [$tag] starting at offset $offsetIndexOfDecoratedObject specifies a length of $totalContentLength octets but $remainingContentLength remain after parsing the content", $offsetIndexOfDecoratedObject);
+        }
+
+        $parsedObject = new self($tag, ...$decoratedObjects);
+        $parsedObject->setContentLength($totalContentLength);
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php
new file mode 100644
index 0000000..b21caa3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php
@@ -0,0 +1,339 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+
+/**
+ * The Identifier encodes the ASN.1 tag (class and number) of the type of a data value.
+ *
+ * Every identifier whose number is in the range 0 to 30 has the following structure:
+ *
+ * Bits:    8  7    6    5  4  3  2  1
+ *       | Class | P/C |   Tag number  |
+ *       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Bits 8 and 7 define the class of this type ( Universal, Application, Context-specific or Private).
+ * Bit 6 encoded whether this type is primitive or constructed
+ * The remaining bits 5 - 1 encode the tag number
+ */
+class Identifier
+{
+    const CLASS_UNIVERSAL        = 0x00;
+    const CLASS_APPLICATION      = 0x01;
+    const CLASS_CONTEXT_SPECIFIC = 0x02;
+    const CLASS_PRIVATE          = 0x03;
+
+    const EOC               = 0x00; // unsupported for now
+    const BOOLEAN           = 0x01;
+    const INTEGER           = 0x02;
+    const BITSTRING         = 0x03;
+    const OCTETSTRING       = 0x04;
+    const NULL              = 0x05;
+    const OBJECT_IDENTIFIER = 0x06;
+    const OBJECT_DESCRIPTOR = 0x07;
+    const EXTERNAL          = 0x08; // unsupported for now
+    const REAL              = 0x09; // unsupported for now
+    const ENUMERATED        = 0x0A;
+    const EMBEDDED_PDV      = 0x0B; // unsupported for now
+    const UTF8_STRING       = 0x0C;
+    const RELATIVE_OID      = 0x0D;
+    // value 0x0E and 0x0F are reserved for future use
+
+    const SEQUENCE          = 0x30;
+    const SET               = 0x31;
+    const NUMERIC_STRING    = 0x12;
+    const PRINTABLE_STRING  = 0x13;
+    const T61_STRING        = 0x14; // sometimes referred to as TeletextString
+    const VIDEOTEXT_STRING  = 0x15;
+    const IA5_STRING        = 0x16;
+    const UTC_TIME          = 0x17;
+    const GENERALIZED_TIME  = 0x18;
+    const GRAPHIC_STRING    = 0x19;
+    const VISIBLE_STRING    = 0x1A;
+    const GENERAL_STRING    = 0x1B;
+    const UNIVERSAL_STRING  = 0x1C;
+    const CHARACTER_STRING  = 0x1D; // Unrestricted character type
+    const BMP_STRING        = 0x1E;
+
+    const LONG_FORM         = 0x1F;
+    const IS_CONSTRUCTED    = 0x20;
+
+    /**
+     * Creates an identifier. Short form identifiers are returned as integers
+     * for BC, long form identifiers will be returned as a string of octets.
+     *
+     * @param int $class
+     * @param bool $isConstructed
+     * @param int $tagNumber
+     *
+     * @throws Exception if the given arguments are invalid
+     *
+     * @return int|string
+     */
+    public static function create($class, $isConstructed, $tagNumber)
+    {
+        if (!is_numeric($class) || $class < self::CLASS_UNIVERSAL || $class > self::CLASS_PRIVATE) {
+            throw new Exception(sprintf('Invalid class %d given', $class));
+        }
+
+        if (!is_bool($isConstructed)) {
+            throw new Exception("\$isConstructed must be a boolean value ($isConstructed given)");
+        }
+
+        $tagNumber = self::makeNumeric($tagNumber);
+        if ($tagNumber < 0) {
+            throw new Exception(sprintf('Invalid $tagNumber %d given. You can only use positive integers.', $tagNumber));
+        }
+
+        if ($tagNumber < self::LONG_FORM) {
+            return ($class << 6) | ($isConstructed << 5) | $tagNumber;
+        }
+
+        $firstOctet = ($class << 6) | ($isConstructed << 5) | self::LONG_FORM;
+
+        // Tag numbers formatted in long form are base-128 encoded. See X.609#8.1.2.4
+        return chr($firstOctet).Base128::encode($tagNumber);
+    }
+
+    public static function isConstructed($identifierOctet)
+    {
+        return ($identifierOctet & self::IS_CONSTRUCTED) === self::IS_CONSTRUCTED;
+    }
+
+    public static function isLongForm($identifierOctet)
+    {
+        return ($identifierOctet & self::LONG_FORM) === self::LONG_FORM;
+    }
+
+    /**
+     * Return the name of the mapped ASN.1 type with a preceding "ASN.1 ".
+     *
+     * Example: ASN.1 Octet String
+     *
+     * @see Identifier::getShortName()
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getName($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        $typeName = static::getShortName($identifier);
+
+        if (($identifierOctet & self::LONG_FORM) < self::LONG_FORM) {
+            $typeName = "ASN.1 {$typeName}";
+        }
+
+        return $typeName;
+    }
+
+    /**
+     * Return the short version of the type name.
+     *
+     * If the given identifier octet can be mapped to a known universal type this will
+     * return its name. Else Identifier::getClassDescription() is used to retrieve
+     * information about the identifier.
+     *
+     * @see Identifier::getName()
+     * @see Identifier::getClassDescription()
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getShortName($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        switch ($identifierOctet) {
+            case self::EOC:
+                return 'End-of-contents octet';
+            case self::BOOLEAN:
+                return 'Boolean';
+            case self::INTEGER:
+                return 'Integer';
+            case self::BITSTRING:
+                return 'Bit String';
+            case self::OCTETSTRING:
+                return 'Octet String';
+            case self::NULL:
+                return 'NULL';
+            case self::OBJECT_IDENTIFIER:
+                return 'Object Identifier';
+            case self::OBJECT_DESCRIPTOR:
+                return 'Object Descriptor';
+            case self::EXTERNAL:
+                return 'External Type';
+            case self::REAL:
+                return 'Real';
+            case self::ENUMERATED:
+                return 'Enumerated';
+            case self::EMBEDDED_PDV:
+                return 'Embedded PDV';
+            case self::UTF8_STRING:
+                return 'UTF8 String';
+            case self::RELATIVE_OID:
+                return 'Relative OID';
+            case self::SEQUENCE:
+                return 'Sequence';
+            case self::SET:
+                return 'Set';
+            case self::NUMERIC_STRING:
+                return 'Numeric String';
+            case self::PRINTABLE_STRING:
+                return 'Printable String';
+            case self::T61_STRING:
+                return 'T61 String';
+            case self::VIDEOTEXT_STRING:
+                return 'Videotext String';
+            case self::IA5_STRING:
+                return 'IA5 String';
+            case self::UTC_TIME:
+                return 'UTC Time';
+            case self::GENERALIZED_TIME:
+                return 'Generalized Time';
+            case self::GRAPHIC_STRING:
+                return 'Graphic String';
+            case self::VISIBLE_STRING:
+                return 'Visible String';
+            case self::GENERAL_STRING:
+                return 'General String';
+            case self::UNIVERSAL_STRING:
+                return 'Universal String';
+            case self::CHARACTER_STRING:
+                return 'Character String';
+            case self::BMP_STRING:
+                return 'BMP String';
+
+            case 0x0E:
+                return 'RESERVED (0x0E)';
+            case 0x0F:
+                return 'RESERVED (0x0F)';
+
+            case self::LONG_FORM:
+            default:
+                $classDescription = self::getClassDescription($identifier);
+
+                if (is_int($identifier)) {
+                    $identifier = chr($identifier);
+                }
+
+                return "$classDescription (0x".strtoupper(bin2hex($identifier)).')';
+        }
+    }
+
+    /**
+     * Returns a textual description of the information encoded in a given identifier octet.
+     *
+     * The first three (most significant) bytes are evaluated to determine if this is a
+     * constructed or primitive type and if it is either universal, application, context-specific or
+     * private.
+     *
+     * Example:
+     *     Constructed context-specific
+     *     Primitive universal
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getClassDescription($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        if (self::isConstructed($identifierOctet)) {
+            $classDescription = 'Constructed ';
+        } else {
+            $classDescription = 'Primitive ';
+        }
+        $classBits = $identifierOctet >> 6;
+        switch ($classBits) {
+            case self::CLASS_UNIVERSAL:
+                $classDescription .= 'universal';
+                break;
+            case self::CLASS_APPLICATION:
+                $classDescription .= 'application';
+                break;
+            case self::CLASS_CONTEXT_SPECIFIC:
+                $tagNumber = self::getTagNumber($identifier);
+                $classDescription = "[$tagNumber] Context-specific";
+                break;
+            case self::CLASS_PRIVATE:
+                $classDescription .= 'private';
+                break;
+
+            default:
+                return "INVALID IDENTIFIER OCTET: {$identifierOctet}";
+        }
+
+        return $classDescription;
+    }
+
+    /**
+     * @param int|string $identifier
+     *
+     * @return int
+     */
+    public static function getTagNumber($identifier)
+    {
+        $firstOctet = self::makeNumeric($identifier);
+        $tagNumber = $firstOctet & self::LONG_FORM;
+
+        if ($tagNumber < self::LONG_FORM) {
+            return $tagNumber;
+        }
+
+        if (is_numeric($identifier)) {
+            $identifier = chr($identifier);
+        }
+        return Base128::decode(substr($identifier, 1));
+    }
+
+    public static function isUniversalClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_UNIVERSAL;
+    }
+
+    public static function isApplicationClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_APPLICATION;
+    }
+
+    public static function isContextSpecificClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_CONTEXT_SPECIFIC;
+    }
+
+    public static function isPrivateClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_PRIVATE;
+    }
+
+    private static function makeNumeric($identifierOctet)
+    {
+        if (!is_numeric($identifierOctet)) {
+            return ord($identifierOctet);
+        } else {
+            return $identifierOctet;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/OID.php b/vendor/fgrosse/phpasn1/lib/ASN1/OID.php
new file mode 100644
index 0000000..d4875c7
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/OID.php
@@ -0,0 +1,199 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class OID
+{
+    const RSA_ENCRYPTION                    = '1.2.840.113549.1.1.1';
+    const MD5_WITH_RSA_ENCRYPTION           = '1.2.840.113549.1.1.4';
+    const SHA1_WITH_RSA_SIGNATURE           = '1.2.840.113549.1.1.5';
+    const SHA256_WITH_RSA_SIGNATURE         = '1.2.840.113549.1.1.11';
+    const PKCS9_EMAIL                       = '1.2.840.113549.1.9.1';
+    const PKCS9_UNSTRUCTURED_NAME           = '1.2.840.113549.1.9.2';
+    const PKCS9_CONTENT_TYPE                = '1.2.840.113549.1.9.3';
+    const PKCS9_MESSAGE_DIGEST              = '1.2.840.113549.1.9.4';
+    const PKCS9_SIGNING_TIME                = '1.2.840.113549.1.9.5';
+    const PKCS9_EXTENSION_REQUEST           = '1.2.840.113549.1.9.14';
+
+    // certificate extension identifier
+    const CERT_EXT_SUBJECT_DIRECTORY_ATTR   = '2.5.29.9';
+    const CERT_EXT_SUBJECT_KEY_IDENTIFIER   = '2.5.29.14';
+    const CERT_EXT_KEY_USAGE                = '2.5.29.15';
+    const CERT_EXT_PRIVATE_KEY_USAGE_PERIOD = '2.5.29.16';
+    const CERT_EXT_SUBJECT_ALT_NAME         = '2.5.29.17';
+    const CERT_EXT_ISSUER_ALT_NAME          = '2.5.29.18';
+    const CERT_EXT_BASIC_CONSTRAINTS        = '2.5.29.19';
+    const CERT_EXT_CRL_NUMBER               = '2.5.29.20';
+    const CERT_EXT_REASON_CODE              = '2.5.29.21';
+    const CERT_EXT_INVALIDITY_DATE          = '2.5.29.24';
+    const CERT_EXT_DELTA_CRL_INDICATOR      = '2.5.29.27';
+    const CERT_EXT_ISSUING_DIST_POINT       = '2.5.29.28';
+    const CERT_EXT_CERT_ISSUER              = '2.5.29.29';
+    const CERT_EXT_NAME_CONSTRAINTS         = '2.5.29.30';
+    const CERT_EXT_CRL_DISTRIBUTION_POINTS  = '2.5.29.31';
+    const CERT_EXT_CERT_POLICIES            = '2.5.29.32';
+    const CERT_EXT_AUTHORITY_KEY_IDENTIFIER = '2.5.29.35';
+    const CERT_EXT_EXTENDED_KEY_USAGE       = '2.5.29.37';
+
+    // standard certificate files
+    const COMMON_NAME                       = '2.5.4.3';
+    const SURNAME                           = '2.5.4.4';
+    const SERIAL_NUMBER                     = '2.5.4.5';
+    const COUNTRY_NAME                      = '2.5.4.6';
+    const LOCALITY_NAME                     = '2.5.4.7';
+    const STATE_OR_PROVINCE_NAME            = '2.5.4.8';
+    const STREET_ADDRESS                    = '2.5.4.9';
+    const ORGANIZATION_NAME                 = '2.5.4.10';
+    const OU_NAME                           = '2.5.4.11';
+    const TITLE                             = '2.5.4.12';
+    const DESCRIPTION                       = '2.5.4.13';
+    const POSTAL_ADDRESS                    = '2.5.4.16';
+    const POSTAL_CODE                       = '2.5.4.17';
+    const AUTHORITY_REVOCATION_LIST         = '2.5.4.38';
+
+    const AUTHORITY_INFORMATION_ACCESS      = '1.3.6.1.5.5.7.1.1';
+
+    /**
+     * Returns the name of the given object identifier.
+     *
+     * Some OIDs are saved as class constants in this class.
+     * If the wanted oidString is not among them, this method will
+     * query http://oid-info.com for the right name.
+     * This behavior can be suppressed by setting the second method parameter to false.
+     *
+     * @param string $oidString
+     * @param bool $loadFromWeb
+     *
+     * @see self::loadFromWeb($oidString)
+     *
+     * @return string
+     */
+    public static function getName($oidString, $loadFromWeb = true)
+    {
+        switch ($oidString) {
+            case self::RSA_ENCRYPTION:
+                return 'RSA Encryption';
+            case self::MD5_WITH_RSA_ENCRYPTION:
+                return 'MD5 with RSA Encryption';
+            case self::SHA1_WITH_RSA_SIGNATURE:
+                return 'SHA-1 with RSA Signature';
+
+            case self::PKCS9_EMAIL:
+                return 'PKCS #9 Email Address';
+            case self::PKCS9_UNSTRUCTURED_NAME:
+                return 'PKCS #9 Unstructured Name';
+            case self::PKCS9_CONTENT_TYPE:
+                return 'PKCS #9 Content Type';
+            case self::PKCS9_MESSAGE_DIGEST:
+                return 'PKCS #9 Message Digest';
+            case self::PKCS9_SIGNING_TIME:
+                return 'PKCS #9 Signing Time';
+
+            case self::COMMON_NAME:
+                return 'Common Name';
+            case self::SURNAME:
+                return 'Surname';
+            case self::SERIAL_NUMBER:
+                return 'Serial Number';
+            case self::COUNTRY_NAME:
+                return 'Country Name';
+            case self::LOCALITY_NAME:
+                return 'Locality Name';
+            case self::STATE_OR_PROVINCE_NAME:
+                return 'State or Province Name';
+            case self::STREET_ADDRESS:
+                return 'Street Address';
+            case self::ORGANIZATION_NAME:
+                return 'Organization Name';
+            case self::OU_NAME:
+                return 'Organization Unit Name';
+            case self::TITLE:
+                return 'Title';
+            case self::DESCRIPTION:
+                return 'Description';
+            case self::POSTAL_ADDRESS:
+                return 'Postal Address';
+            case self::POSTAL_CODE:
+                return 'Postal Code';
+            case self::AUTHORITY_REVOCATION_LIST:
+                return 'Authority Revocation List';
+
+            case self::CERT_EXT_SUBJECT_DIRECTORY_ATTR:
+                return 'Subject directory attributes';
+            case self::CERT_EXT_SUBJECT_KEY_IDENTIFIER:
+                return 'Subject key identifier';
+            case self::CERT_EXT_KEY_USAGE:
+                return 'Key usage certificate extension';
+            case self::CERT_EXT_PRIVATE_KEY_USAGE_PERIOD:
+                return 'Private key usage';
+            case self::CERT_EXT_SUBJECT_ALT_NAME:
+                return 'Subject alternative name (SAN)';
+            case self::CERT_EXT_ISSUER_ALT_NAME:
+                return 'Issuer alternative name';
+            case self::CERT_EXT_BASIC_CONSTRAINTS:
+                return 'Basic constraints';
+            case self::CERT_EXT_CRL_NUMBER:
+                return 'CRL number';
+            case self::CERT_EXT_REASON_CODE:
+                return 'Reason code';
+            case self::CERT_EXT_INVALIDITY_DATE:
+                return 'Invalidity code';
+            case self::CERT_EXT_DELTA_CRL_INDICATOR:
+                return 'Delta CRL indicator';
+            case self::CERT_EXT_ISSUING_DIST_POINT:
+                return 'Issuing distribution point';
+            case self::CERT_EXT_CERT_ISSUER:
+                return 'Certificate issuer';
+            case self::CERT_EXT_NAME_CONSTRAINTS:
+                return 'Name constraints';
+            case self::CERT_EXT_CRL_DISTRIBUTION_POINTS:
+                return 'CRL distribution points';
+            case self::CERT_EXT_CERT_POLICIES:
+                return 'Certificate policies ';
+            case self::CERT_EXT_AUTHORITY_KEY_IDENTIFIER:
+                return 'Authority key identifier';
+            case self::CERT_EXT_EXTENDED_KEY_USAGE:
+                return 'Extended key usage';
+            case self::AUTHORITY_INFORMATION_ACCESS:
+                return 'Certificate Authority Information Access (AIA)';
+
+            default:
+                if ($loadFromWeb) {
+                    return self::loadFromWeb($oidString);
+                } else {
+                    return $oidString;
+                }
+        }
+    }
+
+    public static function loadFromWeb($oidString)
+    {
+        $ch = curl_init("http://oid-info.com/get/{$oidString}");
+
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+        curl_setopt($ch, CURLOPT_HEADER, 0);
+
+        $contents = curl_exec($ch);
+        curl_close($ch);
+
+        // This pattern needs to be updated as soon as the website layout of oid-info.com changes
+        preg_match_all('#<tt>(.+)\(\d+\)</tt>#si', $contents, $oidName);
+
+        if (empty($oidName[1])) {
+            return "{$oidString} (unknown)";
+        }
+
+        $oidName = ucfirst(strtolower(preg_replace('/([A-Z][a-z])/', ' $1', $oidName[1][0])));
+        $oidName = str_replace('-', ' ', $oidName);
+
+        return "{$oidName} ({$oidString})";
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php b/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php
new file mode 100644
index 0000000..fa66b55
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php
@@ -0,0 +1,32 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * The Parsable interface describes classes that can be parsed from their binary DER representation.
+ */
+interface Parsable
+{
+    /**
+     * Parse an instance of this class from its binary DER encoded representation.
+     *
+     * @param string $binaryData
+     * @param int $offsetIndex the offset at which parsing of the $binaryData is started. This parameter ill be modified
+     *            to contain the offset index of the next object after this object has been parsed
+     *
+     * @throws ParserException if the given binary data is either invalid or not currently supported
+     *
+     * @return static
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = null);
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php b/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php
new file mode 100644
index 0000000..90a40b0
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php
@@ -0,0 +1,70 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Universal\Sequence;
+
+class TemplateParser
+{
+    /**
+     * @param string $data
+     * @param array $template
+     * @return \FG\ASN1\ASNObject|Sequence
+     * @throws ParserException if there was an issue parsing
+     */
+    public function parseBase64($data, array $template)
+    {
+        // TODO test with invalid data
+        return $this->parseBinary(base64_decode($data), $template);
+    }
+
+    /**
+     * @param string $binary
+     * @param array $template
+     * @return \FG\ASN1\ASNObject|Sequence
+     * @throws ParserException if there was an issue parsing
+     */
+    public function parseBinary($binary, array $template)
+    {
+        $parsedObject = ASNObject::fromBinary($binary);
+
+        foreach ($template as $key => $value) {
+            $this->validate($parsedObject, $key, $value);
+        }
+
+        return $parsedObject;
+    }
+
+    private function validate(ASNObject $object, $key, $value)
+    {
+        if (is_array($value)) {
+            $this->assertTypeId($key, $object);
+
+            /* @var Construct $object */
+            foreach ($value as $key => $child) {
+                $this->validate($object->current(), $key, $child);
+                $object->next();
+            }
+        } else {
+            $this->assertTypeId($value, $object);
+        }
+    }
+
+    private function assertTypeId($expectedTypeId, ASNObject $object)
+    {
+        $actualType = $object->getType();
+        if ($expectedTypeId != $actualType) {
+            throw new Exception("Expected type ($expectedTypeId) does not match actual type ($actualType");
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php
new file mode 100644
index 0000000..83ec6a9
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php
@@ -0,0 +1,41 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class BMPString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 BMP String.
+     *
+     * BMPString is a subtype of UniversalString that has its own
+     * unique tag and contains only the characters in the
+     * Basic Multilingual Plane (those corresponding to the first
+     * 64K-2 cells, less cells whose encoding is used to address
+     * characters outside the Basic Multilingual Plane) of ISO/IEC 10646-1.
+     *
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::BMP_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
new file mode 100644
index 0000000..226695c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
@@ -0,0 +1,88 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class BitString extends OctetString implements Parsable
+{
+    private $nrOfUnusedBits;
+
+    /**
+     * Creates a new ASN.1 BitString object.
+     *
+     * @param string|int $value Either the hexadecimal value as a string (spaces are allowed - leading 0x is optional) or a numeric value
+     * @param int $nrOfUnusedBits the number of unused bits in the last octet [optional].
+     *
+     * @throws Exception if the second parameter is no positive numeric value
+     */
+    public function __construct($value, $nrOfUnusedBits = 0)
+    {
+        parent::__construct($value);
+
+        if (!is_numeric($nrOfUnusedBits) || $nrOfUnusedBits < 0) {
+            throw new Exception('BitString: second parameter needs to be a positive number (or zero)!');
+        }
+
+        $this->nrOfUnusedBits = $nrOfUnusedBits;
+    }
+
+    public function getType()
+    {
+        return Identifier::BITSTRING;
+    }
+
+    protected function calculateContentLength()
+    {
+        // add one to the length for the first octet which encodes the number of unused bits in the last octet
+        return parent::calculateContentLength() + 1;
+    }
+
+    protected function getEncodedValue()
+    {
+        // the first octet determines the number of unused bits
+        $nrOfUnusedBitsOctet = chr($this->nrOfUnusedBits);
+        $actualContent = parent::getEncodedValue();
+
+        return $nrOfUnusedBitsOctet.$actualContent;
+    }
+
+    public function getNumberOfUnusedBits()
+    {
+        return $this->nrOfUnusedBits;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::BITSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 2);
+
+        $nrOfUnusedBits = ord($binaryData[$offsetIndex]);
+        $value = substr($binaryData, $offsetIndex + 1, $contentLength - 1);
+
+        if ($nrOfUnusedBits > 7 || // no less than 1 used, otherwise non-minimal
+            ($contentLength - 1) == 1 && $nrOfUnusedBits > 0 || // content length only 1, no
+            (ord($value[strlen($value)-1])&((1<<$nrOfUnusedBits)-1)) != 0 // unused bits set
+        ) {
+            throw new ParserException("Can not parse bit string with invalid padding", $offsetIndex);
+        }
+
+        $offsetIndex += $contentLength;
+
+        $parsedObject = new self(bin2hex($value), $nrOfUnusedBits);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php
new file mode 100644
index 0000000..b73c99f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php
@@ -0,0 +1,75 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class Boolean extends ASNObject implements Parsable
+{
+    private $value;
+
+    /**
+     * @param bool $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::BOOLEAN;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 1;
+    }
+
+    protected function getEncodedValue()
+    {
+        if ($this->value == false) {
+            return chr(0x00);
+        } else {
+            return chr(0xFF);
+        }
+    }
+
+    public function getContent()
+    {
+        if ($this->value == true) {
+            return 'TRUE';
+        } else {
+            return 'FALSE';
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::BOOLEAN, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength != 1) {
+            throw new ParserException("An ASN.1 Boolean should not have a length other than one. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $value = ord($binaryData[$offsetIndex++]);
+        $booleanValue = $value == 0xFF ? true : false;
+
+        $parsedObject = new self($booleanValue);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php
new file mode 100644
index 0000000..bfc170d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php
@@ -0,0 +1,28 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class CharacterString extends AbstractString
+{
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::CHARACTER_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php
new file mode 100644
index 0000000..06d04a3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php
@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class Enumerated extends Integer
+{
+    public function getType()
+    {
+        return Identifier::ENUMERATED;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php
new file mode 100644
index 0000000..fb0346f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class GeneralString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 GeneralString.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::GENERAL_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php
new file mode 100644
index 0000000..ca92209
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php
@@ -0,0 +1,134 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractTime;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * This ASN.1 universal type contains date and time information according to ISO 8601.
+ *
+ * The type consists of values representing:
+ * a) a calendar date, as defined in ISO 8601; and
+ * b) a time of day, to any of the precisions defined in ISO 8601, except for the hours value 24 which shall not be used; and
+ * c) the local time differential factor as defined in ISO 8601.
+ *
+ * Decoding of this type will accept the Basic Encoding Rules (BER)
+ * The encoding will comply with the Distinguished Encoding Rules (DER).
+ */
+class GeneralizedTime extends AbstractTime implements Parsable
+{
+    private $microseconds;
+
+    public function __construct($dateTime = null, $dateTimeZone = 'UTC')
+    {
+        parent::__construct($dateTime, $dateTimeZone);
+        $this->microseconds = $this->value->format('u');
+        if ($this->containsFractionalSecondsElement()) {
+            // DER requires us to remove trailing zeros
+            $this->microseconds = preg_replace('/([1-9]+)0+$/', '$1', $this->microseconds);
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::GENERALIZED_TIME;
+    }
+
+    protected function calculateContentLength()
+    {
+        $contentSize = 15; // YYYYMMDDHHmmSSZ
+
+        if ($this->containsFractionalSecondsElement()) {
+            $contentSize += 1 + strlen($this->microseconds);
+        }
+
+        return $contentSize;
+    }
+
+    public function containsFractionalSecondsElement()
+    {
+        return intval($this->microseconds) > 0;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encodedContent = $this->value->format('YmdHis');
+        if ($this->containsFractionalSecondsElement()) {
+            $encodedContent .= ".{$this->microseconds}";
+        }
+
+        return $encodedContent.'Z';
+    }
+
+    public function __toString()
+    {
+        if ($this->containsFractionalSecondsElement()) {
+            return $this->value->format("Y-m-d\tH:i:s.uP");
+        } else {
+            return $this->value->format("Y-m-d\tH:i:sP");
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::GENERALIZED_TIME, $offsetIndex++);
+        $lengthOfMinimumTimeString = 14; // YYYYMMDDHHmmSS
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, $lengthOfMinimumTimeString);
+        $maximumBytesToRead = $contentLength;
+
+        $format = 'YmdGis';
+        $content = substr($binaryData, $offsetIndex, $contentLength);
+        $dateTimeString = substr($content, 0, $lengthOfMinimumTimeString);
+        $offsetIndex += $lengthOfMinimumTimeString;
+        $maximumBytesToRead -= $lengthOfMinimumTimeString;
+
+        if ($contentLength == $lengthOfMinimumTimeString) {
+            $localTimeZone = new \DateTimeZone(date_default_timezone_get());
+            $dateTime = \DateTime::createFromFormat($format, $dateTimeString, $localTimeZone);
+        } else {
+            if ($binaryData[$offsetIndex] == '.') {
+                $maximumBytesToRead--; // account for the '.'
+                $nrOfFractionalSecondElements = 1; // account for the '.'
+
+                while ($maximumBytesToRead > 0
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != '+'
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != '-'
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != 'Z') {
+                    $nrOfFractionalSecondElements++;
+                    $maximumBytesToRead--;
+                }
+
+                $dateTimeString .= substr($binaryData, $offsetIndex, $nrOfFractionalSecondElements);
+                $offsetIndex += $nrOfFractionalSecondElements;
+                $format .= '.u';
+            }
+
+            $dateTime = \DateTime::createFromFormat($format, $dateTimeString, new \DateTimeZone('UTC'));
+
+            if ($maximumBytesToRead > 0) {
+                if ($binaryData[$offsetIndex] == '+'
+                || $binaryData[$offsetIndex] == '-') {
+                    $dateTime = static::extractTimeZoneData($binaryData, $offsetIndex, $dateTime);
+                } elseif ($binaryData[$offsetIndex++] != 'Z') {
+                    throw new ParserException('Invalid ISO 8601 Time String', $offsetIndex);
+                }
+            }
+        }
+
+        $parsedObject = new self($dateTime);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php
new file mode 100644
index 0000000..4a01d67
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class GraphicString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Graphic String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::GRAPHIC_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php
new file mode 100644
index 0000000..33a8067
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+/**
+ * The International Alphabet No.5 (IA5) references the encoding of the ASCII characters.
+ *
+ * Each character in the data is encoded as 1 byte.
+ */
+class IA5String extends AbstractString
+{
+    public function __construct($string)
+    {
+        parent::__construct($string);
+        for ($i = 1; $i < 128; $i++) {
+            $this->allowCharacter(chr($i));
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::IA5_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php
new file mode 100644
index 0000000..fe3806b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php
@@ -0,0 +1,130 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\Utility\BigInteger;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class Integer extends ASNObject implements Parsable
+{
+    /** @var int */
+    private $value;
+
+    /**
+     * @param int $value
+     *
+     * @throws Exception if the value is not numeric
+     */
+    public function __construct($value)
+    {
+        if (is_numeric($value) == false) {
+            throw new Exception("Invalid VALUE [{$value}] for ASN1_INTEGER");
+        }
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::INTEGER;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->getEncodedValue());
+    }
+
+    protected function getEncodedValue()
+    {
+        $value = BigInteger::create($this->value, 10);
+        $negative = $value->compare(0) < 0;
+        if ($negative) {
+             $value = $value->absoluteValue();
+             $limit = 0x80;
+        } else {
+             $limit = 0x7f;
+        }
+
+        $mod = 0xff+1;
+        $values = [];
+        while($value->compare($limit) > 0) {
+            $values[] = $value->modulus($mod)->toInteger();
+            $value = $value->shiftRight(8);
+        }
+
+        $values[] = $value->modulus($mod)->toInteger();
+        $numValues = count($values);
+
+        if ($negative) {
+            for ($i = 0; $i < $numValues; $i++) {
+                $values[$i] = 0xff - $values[$i];
+            }
+            for ($i = 0; $i < $numValues; $i++) {
+                $values[$i] += 1;
+                if ($values[$i] <= 0xff) {
+                    break;
+                }
+                assert($i != $numValues - 1);
+                $values[$i] = 0;
+            }
+            if ($values[$numValues - 1] == 0x7f) {
+                $values[] = 0xff;
+            }
+        }
+        $values = array_reverse($values);
+        $r = pack("C*", ...$values);
+        return $r;
+    }
+
+    private static function ensureMinimalEncoding($binaryData, $offsetIndex)
+    {
+        // All the first nine bits cannot equal 0 or 1, which would
+        // be non-minimal encoding for positive and negative integers respectively
+        if ((ord($binaryData[$offsetIndex]) == 0x00 && (ord($binaryData[$offsetIndex+1]) & 0x80) == 0) ||
+            (ord($binaryData[$offsetIndex]) == 0xff && (ord($binaryData[$offsetIndex+1]) & 0x80) == 0x80)) {
+            throw new ParserException("Integer not minimally encoded", $offsetIndex);
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static(0);
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        if ($contentLength > 1) {
+            self::ensureMinimalEncoding($binaryData, $offsetIndex);
+        }
+        $isNegative = (ord($binaryData[$offsetIndex]) & 0x80) != 0x00;
+        $number = BigInteger::create(ord($binaryData[$offsetIndex++]) & 0x7F);
+
+        for ($i = 0; $i < $contentLength - 1; $i++) {
+            $number = $number->multiply(0x100)->add(ord($binaryData[$offsetIndex++]));
+        }
+
+        if ($isNegative) {
+            $number = $number->subtract(BigInteger::create(2)->toPower(8 * $contentLength - 1));
+        }
+
+        $parsedObject = new static((string)$number);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php
new file mode 100644
index 0000000..b5293e4
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php
@@ -0,0 +1,54 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class NullObject extends ASNObject implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::NULL;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 0;
+    }
+
+    protected function getEncodedValue()
+    {
+        return null;
+    }
+
+    public function getContent()
+    {
+        return 'NULL';
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::NULL, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength != 0) {
+            throw new ParserException("An ASN.1 Null should not have a length other than zero. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $parsedObject = new self();
+        $parsedObject->setContentLength(0);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php
new file mode 100644
index 0000000..13fb7c3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php
@@ -0,0 +1,38 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class NumericString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 NumericString.
+     *
+     * The following characters are permitted:
+     * Digits                0,1, ... 9
+     * SPACE                 (space)
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowNumbers();
+        $this->allowSpaces();
+    }
+
+    public function getType()
+    {
+        return Identifier::NUMERIC_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php
new file mode 100644
index 0000000..1c5d349
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php
@@ -0,0 +1,26 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class ObjectDescriptor extends GraphicString
+{
+    public function __construct($objectDescription)
+    {
+        parent::__construct($objectDescription);
+    }
+
+    public function getType()
+    {
+        return Identifier::OBJECT_DESCRIPTOR;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php
new file mode 100644
index 0000000..150ce9c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php
@@ -0,0 +1,138 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Base128;
+use FG\ASN1\OID;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class ObjectIdentifier extends ASNObject implements Parsable
+{
+    protected $subIdentifiers;
+    protected $value;
+
+    public function __construct($value)
+    {
+        $this->subIdentifiers = explode('.', $value);
+        $nrOfSubIdentifiers = count($this->subIdentifiers);
+
+        for ($i = 0; $i < $nrOfSubIdentifiers; $i++) {
+            if (is_numeric($this->subIdentifiers[$i])) {
+                // enforce the integer type
+                $this->subIdentifiers[$i] = intval($this->subIdentifiers[$i]);
+            } else {
+                throw new Exception("[{$value}] is no valid object identifier (sub identifier ".($i + 1).' is not numeric)!');
+            }
+        }
+
+        // Merge the first to arcs of the OID registration tree (per ASN definition!)
+        if ($nrOfSubIdentifiers >= 2) {
+            $this->subIdentifiers[1] = ($this->subIdentifiers[0] * 40) + $this->subIdentifiers[1];
+            unset($this->subIdentifiers[0]);
+        }
+
+        $this->value = $value;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    public function getType()
+    {
+        return Identifier::OBJECT_IDENTIFIER;
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->subIdentifiers as $subIdentifier) {
+            do {
+                $subIdentifier = $subIdentifier >> 7;
+                $length++;
+            } while ($subIdentifier > 0);
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encodedValue = '';
+        foreach ($this->subIdentifiers as $subIdentifier) {
+            $encodedValue .= Base128::encode($subIdentifier);
+        }
+
+        return $encodedValue;
+    }
+
+    public function __toString()
+    {
+        return OID::getName($this->value);
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OBJECT_IDENTIFIER, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        $firstOctet = ord($binaryData[$offsetIndex++]);
+        $oidString = floor($firstOctet / 40).'.'.($firstOctet % 40);
+        $oidString .= '.'.self::parseOid($binaryData, $offsetIndex, $contentLength - 1);
+
+        $parsedObject = new self($oidString);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+
+    /**
+     * Parses an object identifier except for the first octet, which is parsed
+     * differently. This way relative object identifiers can also be parsed
+     * using this.
+     *
+     * @param $binaryData
+     * @param $offsetIndex
+     * @param $octetsToRead
+     *
+     * @throws ParserException
+     *
+     * @return string
+     */
+    protected static function parseOid(&$binaryData, &$offsetIndex, $octetsToRead)
+    {
+        $oid = '';
+
+        while ($octetsToRead > 0) {
+            $octets = '';
+
+            do {
+                if (0 === $octetsToRead) {
+                    throw new ParserException('Malformed ASN.1 Object Identifier', $offsetIndex - 1);
+                }
+
+                $octetsToRead--;
+                $octet = $binaryData[$offsetIndex++];
+                $octets .= $octet;
+            } while (ord($octet) & 0x80);
+
+            $oid .= sprintf('%d.', Base128::decode($octets));
+        }
+
+        // Remove trailing '.'
+        return substr($oid, 0, -1) ?: '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php
new file mode 100644
index 0000000..5d69ae7
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php
@@ -0,0 +1,91 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class OctetString extends ASNObject implements Parsable
+{
+    protected $value;
+
+    public function __construct($value)
+    {
+        if (is_string($value)) {
+            // remove gaps between hex digits
+            $value = preg_replace('/\s|0x/', '', $value);
+        } elseif (is_numeric($value)) {
+            $value = dechex($value);
+        } elseif ($value === null) {
+            return;
+        } else {
+            throw new Exception('OctetString: unrecognized input type!');
+        }
+
+        if (strlen($value) % 2 != 0) {
+            // transform values like 1F2 to 01F2
+            $value = '0'.$value;
+        }
+
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::OCTETSTRING;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->value) / 2;
+    }
+
+    protected function getEncodedValue()
+    {
+        $value = $this->value;
+        $result = '';
+
+        //Actual content
+        while (strlen($value) >= 2) {
+            // get the hex value byte by byte from the string and and add it to binary result
+            $result .= chr(hexdec(substr($value, 0, 2)));
+            $value = substr($value, 2);
+        }
+
+        return $result;
+    }
+
+    public function getContent()
+    {
+        return strtoupper($this->value);
+    }
+
+    public function getBinaryContent()
+    {
+        return $this->getEncodedValue();
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $value = substr($binaryData, $offsetIndex, $contentLength);
+        $offsetIndex += $contentLength;
+
+        $parsedObject = new self(bin2hex($value));
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php
new file mode 100644
index 0000000..fe6d4bc
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php
@@ -0,0 +1,53 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class PrintableString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 PrintableString.
+     *
+     * The ITU-T X.680 Table 8 permits the following characters:
+     * Latin capital letters A,B, ... Z
+     * Latin small letters   a,b, ... z
+     * Digits                0,1, ... 9
+     * SPACE                 (space)
+     * APOSTROPHE            '
+     * LEFT PARENTHESIS      (
+     * RIGHT PARENTHESIS     )
+     * PLUS SIGN             +
+     * COMMA                 ,
+     * HYPHEN-MINUS          -
+     * FULL STOP             .
+     * SOLIDUS               /
+     * COLON                 :
+     * EQUALS SIGN           =
+     * QUESTION MARK         ?
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowNumbers();
+        $this->allowAllLetters();
+        $this->allowSpaces();
+        $this->allowCharacters("'", '(', ')', '+', '-', '.', ',', '/', ':', '=', '?');
+    }
+
+    public function getType()
+    {
+        return Identifier::PRINTABLE_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php
new file mode 100644
index 0000000..2aa9643
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php
@@ -0,0 +1,57 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class RelativeObjectIdentifier extends ObjectIdentifier implements Parsable
+{
+    public function __construct($subIdentifiers)
+    {
+        $this->value = $subIdentifiers;
+        $this->subIdentifiers = explode('.', $subIdentifiers);
+        $nrOfSubIdentifiers = count($this->subIdentifiers);
+
+        for ($i = 0; $i < $nrOfSubIdentifiers; $i++) {
+            if (is_numeric($this->subIdentifiers[$i])) {
+                // enforce the integer type
+                $this->subIdentifiers[$i] = intval($this->subIdentifiers[$i]);
+            } else {
+                throw new Exception("[{$subIdentifiers}] is no valid object identifier (sub identifier ".($i + 1).' is not numeric)!');
+            }
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::RELATIVE_OID;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::RELATIVE_OID, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        try {
+            $oidString = self::parseOid($binaryData, $offsetIndex, $contentLength);
+        } catch (ParserException $e) {
+            throw new ParserException('Malformed ASN.1 Relative Object Identifier', $e->getOffset());
+        }
+
+        $parsedObject = new self($oidString);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php
new file mode 100644
index 0000000..0397cf1
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php
@@ -0,0 +1,23 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Construct;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class Sequence extends Construct implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::SEQUENCE;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php
new file mode 100644
index 0000000..6e6d346
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php
@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class Set extends Sequence
+{
+    public function getType()
+    {
+        return Identifier::SET;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php
new file mode 100644
index 0000000..5641864
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php
@@ -0,0 +1,36 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class T61String extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 T61 String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @see http://en.wikipedia.org/wiki/ITU_T.61
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::T61_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php
new file mode 100644
index 0000000..c4d303c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php
@@ -0,0 +1,77 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractTime;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * This ASN.1 universal type contains the calendar date and time.
+ *
+ * The precision is one minute or one second and optionally a
+ * local time differential from coordinated universal time.
+ *
+ * Decoding of this type will accept the Basic Encoding Rules (BER)
+ * The encoding will comply with the Distinguished Encoding Rules (DER).
+ */
+class UTCTime extends AbstractTime implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::UTC_TIME;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 13; // Content is a string o the following format: YYMMDDhhmmssZ (13 octets)
+    }
+
+    protected function getEncodedValue()
+    {
+        return $this->value->format('ymdHis').'Z';
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::UTC_TIME, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 11);
+
+        $format = 'ymdGi';
+        $dateTimeString = substr($binaryData, $offsetIndex, 10);
+        $offsetIndex += 10;
+
+        // extract optional seconds part
+        if ($binaryData[$offsetIndex] != 'Z'
+        && $binaryData[$offsetIndex] != '+'
+        && $binaryData[$offsetIndex] != '-') {
+            $dateTimeString .= substr($binaryData, $offsetIndex, 2);
+            $offsetIndex += 2;
+            $format .= 's';
+        }
+
+        $dateTime = \DateTime::createFromFormat($format, $dateTimeString, new \DateTimeZone('UTC'));
+
+        // extract time zone settings
+        if ($binaryData[$offsetIndex] == '+'
+        || $binaryData[$offsetIndex] == '-') {
+            $dateTime = static::extractTimeZoneData($binaryData, $offsetIndex, $dateTime);
+        } elseif ($binaryData[$offsetIndex++] != 'Z') {
+            throw new ParserException('Invalid UTC String', $offsetIndex);
+        }
+
+        $parsedObject = new self($dateTime);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php
new file mode 100644
index 0000000..cba568d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class UTF8String extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Universal String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::UTF8_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php
new file mode 100644
index 0000000..0c3fe1d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php
@@ -0,0 +1,36 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class UniversalString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Universal String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @see http://en.wikipedia.org/wiki/Universal_Character_Set
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::UNIVERSAL_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php
new file mode 100644
index 0000000..d9326d3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class VisibleString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Visible String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::VISIBLE_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php
new file mode 100644
index 0000000..b19a07a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php
@@ -0,0 +1,59 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class UnknownConstructedObject extends Construct
+{
+    private $identifier;
+    private $contentLength;
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws \FG\ASN1\Exception\ParserException
+     */
+    public function __construct($binaryData, &$offsetIndex)
+    {
+        $this->identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+        $this->contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $children = [];
+        $octetsToRead = $this->contentLength;
+        while ($octetsToRead > 0) {
+            $newChild = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $newChild->getObjectLength();
+            $children[] = $newChild;
+        }
+
+        parent::__construct(...$children);
+    }
+
+    public function getType()
+    {
+        return ord($this->identifier);
+    }
+
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->contentLength;
+    }
+
+    protected function getEncodedValue()
+    {
+        return '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php
new file mode 100644
index 0000000..4ac536a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php
@@ -0,0 +1,59 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class UnknownObject extends ASNObject
+{
+    /** @var string */
+    private $value;
+
+    private $identifier;
+
+    /**
+     * @param string|int $identifier Either the first identifier octet as int or all identifier bytes as a string
+     * @param int        $contentLength
+     */
+    public function __construct($identifier, $contentLength)
+    {
+        if (is_int($identifier)) {
+            $identifier = chr($identifier);
+        }
+
+        $this->identifier = $identifier;
+        $this->value = "Unparsable Object ({$contentLength} bytes)";
+        $this->setContentLength($contentLength);
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    public function getType()
+    {
+        return ord($this->identifier[0]);
+    }
+
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->getContentLength();
+    }
+
+    protected function getEncodedValue()
+    {
+        return '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php b/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php
new file mode 100644
index 0000000..866162c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php
@@ -0,0 +1,195 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigInteger
+ * Utility class to remove dependence on a single large number library. Not intended for external use, this class only
+ * implements the functionality needed throughout this project.
+ *
+ * Instances are immutable, all operations return a new instance with the result.
+ *
+ * @package FG\Utility
+ * @internal
+ */
+abstract class BigInteger
+{
+    /**
+     * Force a preference on the underlying big number implementation, useful for testing.
+     * @var string|null
+     */
+    private static $_prefer;
+
+    public static function setPrefer($prefer = null)
+    {
+        self::$_prefer = $prefer;
+    }
+
+    /**
+     * Create a BigInteger instance based off the base 10 string or an integer.
+     * @param string|int $val
+     * @return BigInteger
+     * @throws \InvalidArgumentException
+     */
+    public static function create($val)
+    {
+        if (self::$_prefer) {
+            switch (self::$_prefer) {
+                case 'gmp':
+                    $ret = new BigIntegerGmp();
+                    break;
+                case 'bcmath':
+                    $ret = new BigIntegerBcmath();
+                    break;
+                default:
+                    throw new \UnexpectedValueException('Unknown number implementation: ' . self::$_prefer);
+            }
+        }
+        else {
+            // autodetect
+            if (function_exists('gmp_add')) {
+                $ret = new BigIntegerGmp();
+            }
+            elseif (function_exists('bcadd')) {
+                $ret = new BigIntegerBcmath();
+            } else {
+                throw new \RuntimeException('Requires GMP or bcmath extension.');
+            }
+        }
+
+        if (is_int($val)) {
+            $ret->_fromInteger($val);
+        }
+        else {
+            // convert to string, if not already one
+            $val = (string)$val;
+
+            // validate string
+            if (!preg_match('/^-?[0-9]+$/', $val)) {
+                throw new \InvalidArgumentException('Expects a string representation of an integer.');
+            }
+            $ret->_fromString($val);
+        }
+
+        return $ret;
+    }
+
+    /**
+     * BigInteger constructor.
+     * Prevent directly instantiating object, use BigInteger::create instead.
+     */
+    protected function __construct()
+    {
+
+    }
+
+    /**
+     * Subclasses must provide clone functionality.
+     * @return BigInteger
+     */
+    abstract public function __clone();
+
+    /**
+     * Assign the instance value from base 10 string.
+     * @param string $str
+     */
+    abstract protected function _fromString($str);
+
+    /**
+     * Assign the instance value from an integer type.
+     * @param int $integer
+     */
+    abstract protected function _fromInteger($integer);
+
+    /**
+     * Must provide string implementation that returns base 10 number.
+     * @return string
+     */
+    abstract public function __toString();
+
+    /* INFORMATIONAL FUNCTIONS */
+
+    /**
+     * Return integer, if possible. Throws an exception if the number can not be represented as a native integer.
+     * @return int
+     * @throws \OverflowException
+     */
+    abstract public function toInteger();
+
+    /**
+     * Is represented integer negative?
+     * @return bool
+     */
+    abstract public function isNegative();
+
+    /**
+     * Compare the integer with $number, returns a negative integer if $this is less than number, returns 0 if $this is
+     * equal to number and returns a positive integer if $this is greater than number.
+     * @param BigInteger|string|int $number
+     * @return int
+     */
+    abstract public function compare($number);
+
+    /* MODIFY */
+
+    /**
+     * Add another integer $b and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function add($b);
+
+    /**
+     * Subtract $b from $this and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function subtract($b);
+
+    /**
+     * Multiply value.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function multiply($b);
+
+    /**
+     * The value $this modulus $b.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function modulus($b);
+
+    /**
+     * Raise $this to the power of $b and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function toPower($b);
+
+    /**
+     * Shift the value to the right by a set number of bits and returns the result.
+     * @param int $bits
+     * @return BigInteger
+     */
+    abstract public function shiftRight($bits = 8);
+
+    /**
+     * Shift the value to the left by a set number of bits and returns the result.
+     * @param int $bits
+     * @return BigInteger
+     */
+    abstract public function shiftLeft($bits = 8);
+
+    /**
+     * Returns the absolute value.
+     * @return BigInteger
+     */
+    abstract public function absoluteValue();
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php
new file mode 100644
index 0000000..25ad891
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php
@@ -0,0 +1,133 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigIntegerBcmath
+ * Integer representation of big numbers using the bcmath library to perform large operations.
+ * @package FG\Utility
+ * @internal
+ */
+class BigIntegerBcmath extends BigInteger
+{
+    protected $_str;
+
+    public function __clone()
+    {
+        // nothing needed to copy
+    }
+
+    protected function _fromString($str)
+    {
+        $this->_str = (string)$str;
+    }
+
+    protected function _fromInteger($integer)
+    {
+        $this->_str = (string)$integer;
+    }
+
+    public function __toString()
+    {
+        return $this->_str;
+    }
+
+    public function toInteger()
+    {
+        if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
+            throw new \OverflowException(sprintf('Can not represent %s as integer.', $this->_str));
+        }
+        return (int)$this->_str;
+    }
+
+    public function isNegative()
+    {
+        return bccomp($this->_str, '0', 0) < 0;
+    }
+
+    protected function _unwrap($number)
+    {
+        if ($number instanceof self) {
+            return $number->_str;
+        }
+        return $number;
+    }
+
+    public function compare($number)
+    {
+        return bccomp($this->_str, $this->_unwrap($number), 0);
+    }
+
+    public function add($b)
+    {
+        $ret = new self();
+        $ret->_str = bcadd($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function subtract($b)
+    {
+        $ret = new self();
+        $ret->_str = bcsub($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function multiply($b)
+    {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function modulus($b)
+    {
+        $ret = new self();
+        if ($this->isNegative()) {
+            // bcmod handles negative numbers differently
+            $b = $this->_unwrap($b);
+            $ret->_str = bcsub($b, bcmod(bcsub('0', $this->_str, 0), $b), 0);
+        }
+        else {
+            $ret->_str = bcmod($this->_str, $this->_unwrap($b));
+        }
+        return $ret;
+    }
+
+    public function toPower($b)
+    {
+        $ret = new self();
+        $ret->_str = bcpow($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function shiftRight($bits = 8)
+    {
+        $ret = new self();
+        $ret->_str = bcdiv($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function shiftLeft($bits = 8) {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function absoluteValue()
+    {
+        $ret = new self();
+        if (-1 === bccomp($this->_str, '0', 0)) {
+            $ret->_str = bcsub('0', $this->_str, 0);
+        }
+        else {
+            $ret->_str = $this->_str;
+        }
+        return $ret;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php
new file mode 100644
index 0000000..0791226
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php
@@ -0,0 +1,133 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigIntegerGmp
+ * Integer representation of big numbers using the GMP extension to perform operations.
+ * @package FG\Utility
+ * @internal
+ */
+class BigIntegerGmp extends BigInteger
+{
+    /**
+     * Resource handle.
+     * @var \GMP
+     */
+    protected $_rh;
+
+    public function __clone()
+    {
+        $this->_rh = gmp_add($this->_rh, 0);
+    }
+
+    protected function _fromString($str)
+    {
+        $this->_rh = gmp_init($str, 10);
+    }
+
+    protected function _fromInteger($integer)
+    {
+        $this->_rh = gmp_init($integer, 10);
+    }
+
+    public function __toString()
+    {
+        return gmp_strval($this->_rh, 10);
+    }
+
+    public function toInteger()
+    {
+        if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
+            throw new \OverflowException(sprintf('Can not represent %s as integer.', $this));
+        }
+        return gmp_intval($this->_rh);
+    }
+
+    public function isNegative()
+    {
+        return gmp_sign($this->_rh) === -1;
+    }
+
+    protected function _unwrap($number)
+    {
+        if ($number instanceof self) {
+            return $number->_rh;
+        }
+        return $number;
+    }
+
+    public function compare($number)
+    {
+        return gmp_cmp($this->_rh, $this->_unwrap($number));
+    }
+
+    public function add($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_add($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function subtract($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_sub($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function multiply($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mul($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function modulus($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mod($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function toPower($b)
+    {
+        if ($b instanceof self) {
+            // gmp_pow accepts just an integer
+            if ($b->compare(PHP_INT_MAX) > 0) {
+                throw new \UnexpectedValueException('Unable to raise to power greater than PHP_INT_MAX.');
+            }
+            $b = gmp_intval($b->_rh);
+        }
+        $ret = new self();
+        $ret->_rh = gmp_pow($this->_rh, $b);
+        return $ret;
+    }
+
+    public function shiftRight($bits=8)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_div($this->_rh, gmp_pow(2, $bits));
+        return $ret;
+    }
+
+    public function shiftLeft($bits=8)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mul($this->_rh, gmp_pow(2, $bits));
+        return $ret;
+    }
+
+    public function absoluteValue()
+    {
+        $ret = new self();
+        $ret->_rh = gmp_abs($this->_rh);
+        return $ret;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php b/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php
new file mode 100644
index 0000000..a06b56f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php
@@ -0,0 +1,22 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Composite\AttributeTypeAndValue;
+
+class AlgorithmIdentifier extends AttributeTypeAndValue
+{
+    public function __construct($objectIdentifierString)
+    {
+        parent::__construct($objectIdentifierString, new NullObject());
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php b/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php
new file mode 100644
index 0000000..5a965e2
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php
@@ -0,0 +1,68 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\CSR;
+
+use FG\ASN1\ASNObject;
+use FG\X509\CertificateExtensions;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Construct;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class Attributes extends Construct implements Parsable
+{
+    public function getType()
+    {
+        return 0xA0;
+    }
+
+    public function addAttribute($objectIdentifier, Set $attribute)
+    {
+        if (is_string($objectIdentifier)) {
+            $objectIdentifier = new ObjectIdentifier($objectIdentifier);
+        }
+        $attributeSequence = new Sequence($objectIdentifier, $attribute);
+        $attributeSequence->getNumberOfLengthOctets();  // length and number of length octets is calculated
+        $this->addChild($attributeSequence);
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], 0xA0, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $octetsToRead = $contentLength;
+
+        $parsedObject = new self();
+        while ($octetsToRead > 0) {
+            $initialOffset = $offsetIndex; // used to calculate how much bits have been read
+            self::parseIdentifier($binaryData[$offsetIndex], Identifier::SEQUENCE, $offsetIndex++);
+            self::parseContentLength($binaryData, $offsetIndex);
+
+            $objectIdentifier = ObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            $oidString = $objectIdentifier->getContent();
+            if ($oidString == OID::PKCS9_EXTENSION_REQUEST) {
+                $attribute = CertificateExtensions::fromBinary($binaryData, $offsetIndex);
+            } else {
+                $attribute = ASNObject::fromBinary($binaryData, $offsetIndex);
+            }
+
+            $parsedObject->addAttribute($objectIdentifier, $attribute);
+            $octetsToRead -= ($offsetIndex - $initialOffset);
+        }
+
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php b/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php
new file mode 100644
index 0000000..53f9aeb
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php
@@ -0,0 +1,159 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\CSR;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\Integer;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\Sequence;
+use FG\X509\CertificateSubject;
+use FG\X509\AlgorithmIdentifier;
+use FG\X509\PublicKey;
+
+class CSR extends Sequence
+{
+    const CSR_VERSION_NR = 0;
+
+    protected $subject;
+    protected $publicKey;
+    protected $signature;
+    protected $signatureAlgorithm;
+
+    protected $startSequence;
+
+    /**
+     * @param string $commonName
+     * @param string $email
+     * @param string $organization
+     * @param string $locality
+     * @param string $state
+     * @param string $country
+     * @param string $organizationalUnit
+     * @param string $publicKey
+     * @param string $signature
+     * @param string $signatureAlgorithm
+     */
+    public function __construct($commonName, $email, $organization, $locality, $state, $country, $organizationalUnit, $publicKey, $signature = null, $signatureAlgorithm = OID::SHA1_WITH_RSA_SIGNATURE)
+    {
+        $this->subject = new CertificateSubject(
+            $commonName,
+            $email,
+            $organization,
+            $locality,
+            $state,
+            $country,
+            $organizationalUnit
+        );
+        $this->publicKey = $publicKey;
+        $this->signature = $signature;
+        $this->signatureAlgorithm = $signatureAlgorithm;
+
+        if (isset($signature)) {
+            $this->createCSRSequence();
+        }
+    }
+
+    protected function createCSRSequence()
+    {
+        $versionNr            = new Integer(self::CSR_VERSION_NR);
+        $publicKey            = new PublicKey($this->publicKey);
+        $signature            = new BitString($this->signature);
+        $signatureAlgorithm    = new AlgorithmIdentifier($this->signatureAlgorithm);
+
+        $certRequestInfo  = new Sequence($versionNr, $this->subject, $publicKey);
+
+        // Clear the underlying Construct
+        $this->rewind();
+        $this->children = [];
+        $this->addChild($certRequestInfo);
+        $this->addChild($signatureAlgorithm);
+        $this->addChild($signature);
+    }
+
+    public function getSignatureSubject()
+    {
+        $versionNr            = new Integer(self::CSR_VERSION_NR);
+        $publicKey            = new PublicKey($this->publicKey);
+
+        $certRequestInfo  = new Sequence($versionNr, $this->subject, $publicKey);
+        return $certRequestInfo->getBinary();
+    }
+
+    public function setSignature($signature, $signatureAlgorithm = OID::SHA1_WITH_RSA_SIGNATURE)
+    {
+        $this->signature = $signature;
+        $this->signatureAlgorithm = $signatureAlgorithm;
+
+        $this->createCSRSequence();
+    }
+
+    public function __toString()
+    {
+        $tmp = base64_encode($this->getBinary());
+
+        for ($i = 0; $i < strlen($tmp); $i++) {
+            if (($i + 2) % 65 == 0) {
+                $tmp = substr($tmp, 0, $i + 1)."\n".substr($tmp, $i + 1);
+            }
+        }
+
+        $result = '-----BEGIN CERTIFICATE REQUEST-----'.PHP_EOL;
+        $result .= $tmp.PHP_EOL;
+        $result .= '-----END CERTIFICATE REQUEST-----';
+
+        return $result;
+    }
+
+    public function getVersion()
+    {
+        return self::CSR_VERSION_NR;
+    }
+
+    public function getOrganizationName()
+    {
+        return $this->subject->getOrganization();
+    }
+
+    public function getLocalName()
+    {
+        return $this->subject->getLocality();
+    }
+
+    public function getState()
+    {
+        return $this->subject->getState();
+    }
+
+    public function getCountry()
+    {
+        return $this->subject->getCountry();
+    }
+
+    public function getOrganizationalUnit()
+    {
+        return $this->subject->getOrganizationalUnit();
+    }
+
+    public function getPublicKey()
+    {
+        return $this->publicKey;
+    }
+
+    public function getSignature()
+    {
+        return $this->signature;
+    }
+
+    public function getSignatureAlgorithm()
+    {
+        return $this->signatureAlgorithm;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php b/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php
new file mode 100644
index 0000000..6ed1c6a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php
@@ -0,0 +1,100 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\OID;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\OctetString;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+use FG\X509\SAN\SubjectAlternativeNames;
+
+class CertificateExtensions extends Set implements Parsable
+{
+    private $innerSequence;
+    private $extensions = [];
+
+    public function __construct()
+    {
+        $this->innerSequence = new Sequence();
+        parent::__construct($this->innerSequence);
+    }
+
+    public function addSubjectAlternativeNames(SubjectAlternativeNames $sans)
+    {
+        $this->addExtension(OID::CERT_EXT_SUBJECT_ALT_NAME, $sans);
+    }
+
+    private function addExtension($oidString, ASNObject $extension)
+    {
+        $sequence = new Sequence();
+        $sequence->addChild(new ObjectIdentifier($oidString));
+        $sequence->addChild($extension);
+
+        $this->innerSequence->addChild($sequence);
+        $this->extensions[] = $extension;
+    }
+
+    public function getContent()
+    {
+        return $this->extensions;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::SET, $offsetIndex++);
+        self::parseContentLength($binaryData, $offsetIndex);
+
+        $tmpOffset = $offsetIndex;
+        $extensions = Sequence::fromBinary($binaryData, $offsetIndex);
+        $tmpOffset += 1 + $extensions->getNumberOfLengthOctets();
+
+        $parsedObject = new self();
+        foreach ($extensions as $extension) {
+            if ($extension->getType() != Identifier::SEQUENCE) {
+                //FIXME wrong offset index
+                throw new ParserException('Could not parse Certificate Extensions: Expected ASN.1 Sequence but got '.$extension->getTypeName(), $offsetIndex);
+            }
+
+            $tmpOffset += 1 + $extension->getNumberOfLengthOctets();
+            $children = $extension->getChildren();
+            if (count($children) < 2) {
+                throw new ParserException('Could not parse Certificate Extensions: Needs at least two child elements per extension sequence (object identifier and octet string)', $tmpOffset);
+            }
+            /** @var \FG\ASN1\ASNObject $objectIdentifier */
+            $objectIdentifier = $children[0];
+
+            /** @var OctetString $octetString */
+            $octetString = $children[1];
+
+            if ($objectIdentifier->getType() != Identifier::OBJECT_IDENTIFIER) {
+                throw new ParserException('Could not parse Certificate Extensions: Expected ASN.1 Object Identifier but got '.$extension->getTypeName(), $tmpOffset);
+            }
+
+            $tmpOffset += $objectIdentifier->getObjectLength();
+
+            if ($objectIdentifier->getContent() == OID::CERT_EXT_SUBJECT_ALT_NAME) {
+                $sans = SubjectAlternativeNames::fromBinary($binaryData, $tmpOffset);
+                $parsedObject->addSubjectAlternativeNames($sans);
+            } else {
+                // can now only parse SANs. There might be more in the future
+                $tmpOffset += $octetString->getObjectLength();
+            }
+        }
+
+        $parsedObject->getBinary(); // Determine the number of content octets and object sizes once (just to let the equality unit tests pass :/ )
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php b/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php
new file mode 100644
index 0000000..0a04d57
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php
@@ -0,0 +1,108 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Composite\RelativeDistinguishedName;
+use FG\ASN1\Identifier;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Composite\RDNString;
+use FG\ASN1\Universal\Sequence;
+
+class CertificateSubject extends Sequence implements Parsable
+{
+    private $commonName;
+    private $email;
+    private $organization;
+    private $locality;
+    private $state;
+    private $country;
+    private $organizationalUnit;
+
+    /**
+     * @param string $commonName
+     * @param string $email
+     * @param string $organization
+     * @param string $locality
+     * @param string $state
+     * @param string $country
+     * @param string $organizationalUnit
+     */
+    public function __construct($commonName, $email, $organization, $locality, $state, $country, $organizationalUnit)
+    {
+        parent::__construct(
+            new RDNString(OID::COUNTRY_NAME, $country),
+            new RDNString(OID::STATE_OR_PROVINCE_NAME, $state),
+            new RDNString(OID::LOCALITY_NAME, $locality),
+            new RDNString(OID::ORGANIZATION_NAME, $organization),
+            new RDNString(OID::OU_NAME, $organizationalUnit),
+            new RDNString(OID::COMMON_NAME, $commonName),
+            new RDNString(OID::PKCS9_EMAIL, $email)
+        );
+
+        $this->commonName = $commonName;
+        $this->email = $email;
+        $this->organization = $organization;
+        $this->locality = $locality;
+        $this->state = $state;
+        $this->country = $country;
+        $this->organizationalUnit = $organizationalUnit;
+    }
+
+    public function getCommonName()
+    {
+        return $this->commonName;
+    }
+
+    public function getEmail()
+    {
+        return $this->email;
+    }
+
+    public function getOrganization()
+    {
+        return $this->organization;
+    }
+
+    public function getLocality()
+    {
+        return $this->locality;
+    }
+
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    public function getCountry()
+    {
+        return $this->country;
+    }
+
+    public function getOrganizationalUnit()
+    {
+        return $this->organizationalUnit;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::SEQUENCE, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $names = [];
+        $octetsToRead = $contentLength;
+        while ($octetsToRead > 0) {
+            $relativeDistinguishedName = RelativeDistinguishedName::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $relativeDistinguishedName->getObjectLength();
+            $names[] = $relativeDistinguishedName;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php b/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php
new file mode 100644
index 0000000..d57ad86
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class PrivateKey extends Sequence
+{
+    /**
+     * @param string $hexKey
+     * @param \FG\ASN1\ASNObject|string $algorithmIdentifierString
+     */
+    public function __construct($hexKey, $algorithmIdentifierString = OID::RSA_ENCRYPTION)
+    {
+        parent::__construct(
+            new Sequence(
+                new ObjectIdentifier($algorithmIdentifierString),
+                new NullObject()
+            ),
+            new BitString($hexKey)
+        );
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php b/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php
new file mode 100644
index 0000000..ab8b451
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class PublicKey extends Sequence
+{
+    /**
+     * @param string $hexKey
+     * @param \FG\ASN1\ASNObject|string $algorithmIdentifierString
+     */
+    public function __construct($hexKey, $algorithmIdentifierString = OID::RSA_ENCRYPTION)
+    {
+        parent::__construct(
+            new Sequence(
+                new ObjectIdentifier($algorithmIdentifierString),
+                new NullObject()
+            ),
+            new BitString($hexKey)
+        );
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php
new file mode 100644
index 0000000..502738b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php
@@ -0,0 +1,28 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\Universal\GeneralString;
+
+class DNSName extends GeneralString
+{
+    const IDENTIFIER = 0x82; // not sure yet why this is the identifier used in SAN extensions
+
+    public function __construct($dnsNameString)
+    {
+        parent::__construct($dnsNameString);
+    }
+
+    public function getType()
+    {
+        return self::IDENTIFIER;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php
new file mode 100644
index 0000000..f55be95
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php
@@ -0,0 +1,73 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Exception\ParserException;
+
+class IPAddress extends ASNObject implements Parsable
+{
+    const IDENTIFIER = 0x87; // not sure yet why this is the identifier used in SAN extensions
+
+    /** @var string */
+    private $value;
+
+    public function __construct($ipAddressString)
+    {
+        $this->value = $ipAddressString;
+    }
+
+    public function getType()
+    {
+        return self::IDENTIFIER;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 4;
+    }
+
+    protected function getEncodedValue()
+    {
+        $ipParts = explode('.', $this->value);
+        $binary  = chr($ipParts[0]);
+        $binary .= chr($ipParts[1]);
+        $binary .= chr($ipParts[2]);
+        $binary .= chr($ipParts[3]);
+
+        return $binary;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], self::IDENTIFIER, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        if ($contentLength != 4) {
+            throw new ParserException("A FG\\X509\SAN\IPAddress should have a content length of 4. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $ipAddressString = ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]);
+
+        $parsedObject = new self($ipAddressString);
+        $parsedObject->getObjectLength();
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php
new file mode 100644
index 0000000..271ddde
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php
@@ -0,0 +1,96 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\Sequence;
+
+/**
+ * See section 8.3.2.1 of ITU-T X.509.
+ */
+class SubjectAlternativeNames extends ASNObject implements Parsable
+{
+    private $alternativeNamesSequence;
+
+    public function __construct()
+    {
+        $this->alternativeNamesSequence = new Sequence();
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->alternativeNamesSequence->getObjectLength();
+    }
+
+    public function getType()
+    {
+        return Identifier::OCTETSTRING;
+    }
+
+    public function addDomainName(DNSName $domainName)
+    {
+        $this->alternativeNamesSequence->addChild($domainName);
+    }
+
+    public function addIP(IPAddress $ip)
+    {
+        $this->alternativeNamesSequence->addChild($ip);
+    }
+
+    public function getContent()
+    {
+        return $this->alternativeNamesSequence->getContent();
+    }
+
+    protected function getEncodedValue()
+    {
+        return $this->alternativeNamesSequence->getBinary();
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength < 2) {
+            throw new ParserException('Can not parse Subject Alternative Names: The Sequence within the octet string after the Object identifier '.OID::CERT_EXT_SUBJECT_ALT_NAME." is too short ({$contentLength} octets)", $offsetIndex);
+        }
+
+        $offsetOfSequence = $offsetIndex;
+        $sequence = Sequence::fromBinary($binaryData, $offsetIndex);
+        $offsetOfSequence += $sequence->getNumberOfLengthOctets() + 1;
+
+        if ($sequence->getObjectLength() != $contentLength) {
+            throw new ParserException('Can not parse Subject Alternative Names: The Sequence length does not match the length of the surrounding octet string', $offsetIndex);
+        }
+
+        $parsedObject = new self();
+        /** @var \FG\ASN1\ASNObject $object */
+        foreach ($sequence as $object) {
+            if ($object->getType() == DNSName::IDENTIFIER) {
+                $domainName = DNSName::fromBinary($binaryData, $offsetOfSequence);
+                $parsedObject->addDomainName($domainName);
+            } elseif ($object->getType() == IPAddress::IDENTIFIER) {
+                $ip = IPAddress::fromBinary($binaryData, $offsetOfSequence);
+                $parsedObject->addIP($ip);
+            } else {
+                throw new ParserException('Could not parse Subject Alternative Name: Only DNSName and IP SANs are currently supported', $offsetIndex);
+            }
+        }
+
+        $parsedObject->getBinary(); // Determine the number of content octets and object sizes once (just to let the equality unit tests pass :/ )
+        return $parsedObject;
+    }
+}