<?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;
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjAzNTQ0OTk3MzMyNTYxIDQ3OTc2MzYyMjg1Nzg3ODMgMzQwMTUzNDkwNjM5MDg3