<?php

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:----NDMxODQ2MjQwNjgyMDE3MSAyNjE5MTYxNzk3ODE1NDY1IDcwNjYyODg0NDE2MzQ1NzU=