1 files changed, 100 insertions, 0 deletions
diff --git a/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/PasswordHasher.php b/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/PasswordHasher.php
new file mode 100644
index 0000000..894503e
--- /dev/null
+++ b/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/PasswordHasher.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Shared;
+
+use PhpOffice\PhpSpreadsheet\Exception;
+use PhpOffice\PhpSpreadsheet\Worksheet\Protection;
+
+class PasswordHasher
+{
+    /**
+     * Get algorithm name for PHP.
+     */
+    private static function getAlgorithm(string $algorithmName): string
+    {
+        if (!$algorithmName) {
+            return '';
+        }
+
+        // Mapping between algorithm name in Excel and algorithm name in PHP
+        $mapping = [
+            Protection::ALGORITHM_MD2 => 'md2',
+            Protection::ALGORITHM_MD4 => 'md4',
+            Protection::ALGORITHM_MD5 => 'md5',
+            Protection::ALGORITHM_SHA_1 => 'sha1',
+            Protection::ALGORITHM_SHA_256 => 'sha256',
+            Protection::ALGORITHM_SHA_384 => 'sha384',
+            Protection::ALGORITHM_SHA_512 => 'sha512',
+            Protection::ALGORITHM_RIPEMD_128 => 'ripemd128',
+            Protection::ALGORITHM_RIPEMD_160 => 'ripemd160',
+            Protection::ALGORITHM_WHIRLPOOL => 'whirlpool',
+        ];
+
+        if (array_key_exists($algorithmName, $mapping)) {
+            return $mapping[$algorithmName];
+        }
+
+        throw new Exception('Unsupported password algorithm: ' . $algorithmName);
+    }
+
+    /**
+     * Create a password hash from a given string.
+     *
+     * This method is based on the algorithm provided by
+     * Daniel Rentz of OpenOffice and the PEAR package
+     * Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
+     *
+     * @param string $pPassword Password to hash
+     */
+    private static function defaultHashPassword(string $pPassword): string
+    {
+        $password = 0x0000;
+        $charPos = 1; // char position
+
+        // split the plain text password in its component characters
+        $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
+        foreach ($chars as $char) {
+            $value = ord($char) << $charPos++; // shifted ASCII value
+            $rotated_bits = $value >> 15; // rotated bits beyond bit 15
+            $value &= 0x7fff; // first 15 bits
+            $password ^= ($value | $rotated_bits);
+        }
+
+        $password ^= strlen($pPassword);
+        $password ^= 0xCE4B;
+
+        return strtoupper(dechex($password));
+    }
+
+    /**
+     * Create a password hash from a given string by a specific algorithm.
+     *
+     * 2.4.2.4 ISO Write Protection Method
+     *
+     * @see https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/1357ea58-646e-4483-92ef-95d718079d6f
+     *
+     * @param string $password Password to hash
+     * @param string $algorithm Hash algorithm used to compute the password hash value
+     * @param string $salt Pseudorandom string
+     * @param int $spinCount Number of times to iterate on a hash of a password
+     *
+     * @return string Hashed password
+     */
+    public static function hashPassword(string $password, string $algorithm = '', string $salt = '', int $spinCount = 10000): string
+    {
+        $phpAlgorithm = self::getAlgorithm($algorithm);
+        if (!$phpAlgorithm) {
+            return self::defaultHashPassword($password);
+        }
+
+        $saltValue = base64_decode($salt);
+        $encodedPassword = mb_convert_encoding($password, 'UCS-2LE', 'UTF-8');
+
+        $hashValue = hash($phpAlgorithm, $saltValue . $encodedPassword, true);
+        for ($i = 0; $i < $spinCount; ++$i) {
+            $hashValue = hash($phpAlgorithm, $hashValue . pack('L', $i), true);
+        }
+
+        return base64_encode($hashValue);
+    }
+}