<?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:----NjQ1MzIxNzMwOTAzMzkyIDc2NDQyNTMyMDUyNTE0NzYgOTkyMzY0NzUxMDkyMjA4OQ==