<?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:----OTM3OTU5Mzc0MzQwMDM3MCA4MjA4NDA3MDE2MTM1ODggNDM2NTg4MTQzMzY1OTk4NQ==