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<?php |
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/* |
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* This file is part of the Guarded Authentication package. |
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* |
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* (c) Jafar Jabr <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Jafar\Bundle\GuardedAuthenticationBundle\Api\JWTSigner\Signer\OpenSSL; |
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use Jafar\Bundle\GuardedAuthenticationBundle\Api\JWTSigner\Signer\SignerInterface; |
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/** |
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* Class HMAC. |
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* This class is the base of all HMAC Signers. |
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* |
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* @author Jafar Jabr <[email protected]> |
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*/ |
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abstract class HMAC implements SignerInterface |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function sign($input, $key) |
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{ |
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return hash_hmac($this->getHashingAlgorithm(), $input, (string) $key, true); |
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} |
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/** |
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* To prevent timing attacks we are using PHP 5.6 native function hash_equals, |
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* in case of PHP < 5.6 a timing safe equals comparison function. |
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* |
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* more info here: |
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* http://blog.ircmaxell.com/2014/11/its-all-about-time.html |
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* |
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* |
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* {@inheritdoc} |
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*/ |
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public function verify($key, $signature, $input) |
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{ |
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$signedInput = $this->sign($input, $key); |
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return $this->timingSafeEquals($signedInput, $signature); |
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} |
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/** |
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* A timing safe equals comparison. |
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* |
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* @param string $known the internal signature to be checked |
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* @param string $input The signed input submitted value |
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* |
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* @return bool true if the two strings are identical |
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*/ |
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public function timingSafeEquals($known, $input) |
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{ |
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return hash_equals($known, $input); |
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} |
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/** |
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* Returns the hashing algorithm used in this signer. |
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* |
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* @return string |
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*/ |
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abstract public function getHashingAlgorithm(); |
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} |
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jafaronly /
guarded-authentication-bundle
