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vendor/lcobucci/jwt/src/Signer/Hmac.php

@@ -0,0 +1,44 @@
+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\JWT\Signer;
+
+use Lcobucci\JWT\Signer;
+
+use function hash_equals;
+use function hash_hmac;
+use function strlen;
+
+abstract class Hmac implements Signer
+{
+    final public function sign(string $payload, Key $key): string
+    {
+        $actualKeyLength   = 8 * strlen($key->contents());
+        $expectedKeyLength = $this->minimumBitsLengthForKey();
+
+        if ($actualKeyLength < $expectedKeyLength) {
+            throw InvalidKeyProvided::tooShort($expectedKeyLength, $actualKeyLength);
+        }
+
+        return hash_hmac($this->algorithm(), $payload, $key->contents(), true);
+    }
+
+    final public function verify(string $expected, string $payload, Key $key): bool
+    {
+        return hash_equals($expected, $this->sign($payload, $key));
+    }
+
+    /**
+     * @internal
+     *
+     * @return non-empty-string
+     */
+    abstract public function algorithm(): string;
+
+    /**
+     * @internal
+     *
+     * @return positive-int
+     */
+    abstract public function minimumBitsLengthForKey(): int;
+}