<?php

namespace Jose\Component\Signature\Algorithm;

use InvalidArgumentException;
use Jose\Component\Core\JWK;
use ParagonIE\ConstantTime\Base64UrlSafe;

use function in_array;
use function is_string;

abstract class HMAC implements MacAlgorithm
{
    public function allowedKeyTypes(): array
    {
        return ['oct'];
    }

    public function verify(JWK $key, string $input, string $signature): bool
    {
        return hash_equals($this->hash($key, $input), $signature);
    }

    public function hash(JWK $key, string $input): string
    {
        $k = $this->getKey($key);

        return hash_hmac($this->getHashAlgorithm(), $input, $k, true);
    }

    protected function getKey(JWK $key): string
    {
        if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
            throw new InvalidArgumentException('Wrong key type.');
        }
        if (! $key->has('k')) {
            throw new InvalidArgumentException('The key parameter "k" is missing.');
        }
        $k = $key->get('k');
        if (! is_string($k)) {
            throw new InvalidArgumentException('The key parameter "k" is invalid.');
        }

        return Base64UrlSafe::decodeNoPadding($k);
    }

    abstract protected function getHashAlgorithm(): string;
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----Njg2ODEzODMyMTcxNzYxNCAzODE2NzI3NDI2Mjc0IDc2NzQyNTYwNjU3NTgxMTI=