1 files changed, 49 insertions, 0 deletions

diff --git a/vendor/web-token/jwt-signature-algorithm-hmac/HMAC.php b/vendor/web-token/jwt-signature-algorithm-hmac/HMAC.php
new file mode 100644
index 0000000..e676bed
--- /dev/null
+++ b/vendor/web-token/jwt-signature-algorithm-hmac/HMAC.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2018 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace Jose\Component\Signature\Algorithm;
+
+use Base64Url\Base64Url;
+use Jose\Component\Core\JWK;
+
+abstract class HMAC implements SignatureAlgorithm
+{
+    public function allowedKeyTypes(): array
+    {
+        return ['oct'];
+    }
+
+    public function verify(JWK $key, string $input, string $signature): bool
+    {
+        return \hash_equals($this->sign($key, $input), $signature);
+    }
+
+    public function sign(JWK $key, string $input): string
+    {
+        $this->checkKey($key);
+
+        return \hash_hmac($this->getHashAlgorithm(), $input, Base64Url::decode($key->get('k')), true);
+    }
+
+    protected function checkKey(JWK $key)
+    {
+        if (!\in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
+            throw new \InvalidArgumentException('Wrong key type.');
+        }
+        if (!$key->has('k')) {
+            throw new \InvalidArgumentException('The key parameter "k" is missing.');
+        }
+    }
+
+    abstract protected function getHashAlgorithm(): string;
+}