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Edit File : Hmac.php \| Size : 1.59 KB
<?php /** * This file is part of Lcobucci\JWT, a simple library to handle JWT and JWS * * @license http://opensource.org/licenses/BSD-3-Clause BSD-3-Clause / namespace Lcobucci\JWT\Signer; /* * Base class for hmac signers * * @author Luís Otávio Cobucci Oblonczyk <lcobucci@gmail.com> * @since 0.1.0 / abstract class Hmac extends BaseSigner { /* * {@inheritdoc} / public function createHash($payload, Key $key) { return hash_hmac($this->getAlgorithm(), $payload, $key->getContent(), true); } /* * {@inheritdoc} / public function doVerify($expected, $payload, Key $key) { if (!is_string($expected)) { return false; } $callback = function_exists('hash_equals') ? 'hash_equals' : [$this, 'hashEquals']; return call_user_func($callback, $expected, $this->createHash($payload, $key)); } /* * PHP < 5.6 timing attack safe hash comparison * * @internal * * @param string $expected * @param string $generated * * @return boolean / public function hashEquals($expected, $generated) { $expectedLength = strlen($expected); if ($expectedLength !== strlen($generated)) { return false; } $res = 0; for ($i = 0; $i < $expectedLength; ++$i) { $res \|= ord($expected[$i]) ^ ord($generated[$i]); } return $res === 0; } /* * Returns the algorithm name * * @internal * * @return string */ abstract public function getAlgorithm(); } Back

Edit File : Hmac.php | Size : 1.59 KB

<?php
/**
 * This file is part of Lcobucci\JWT, a simple library to handle JWT and JWS
 *
 * @license http://opensource.org/licenses/BSD-3-Clause BSD-3-Clause
 */

namespace Lcobucci\JWT\Signer;

/**
 * Base class for hmac signers
 *
 * @author Luís Otávio Cobucci Oblonczyk <lcobucci@gmail.com>
 * @since 0.1.0
 */
abstract class Hmac extends BaseSigner
{
    /**
     * {@inheritdoc}
     */
    public function createHash($payload, Key $key)
    {
        return hash_hmac($this->getAlgorithm(), $payload, $key->getContent(), true);
    }

/**
     * {@inheritdoc}
     */
    public function doVerify($expected, $payload, Key $key)
    {
        if (!is_string($expected)) {
            return false;
        }

$callback = function_exists('hash_equals') ? 'hash_equals' : [$this, 'hashEquals'];

return call_user_func($callback, $expected, $this->createHash($payload, $key));
    }

/**
     * PHP < 5.6 timing attack safe hash comparison
     *
     * @internal
     *
     * @param string $expected
     * @param string $generated
     *
     * @return boolean
     */
    public function hashEquals($expected, $generated)
    {
        $expectedLength = strlen($expected);

if ($expectedLength !== strlen($generated)) {
            return false;
        }

$res = 0;

for ($i = 0; $i < $expectedLength; ++$i) {
            $res |= ord($expected[$i]) ^ ord($generated[$i]);
        }

return $res === 0;
    }

/**
     * Returns the algorithm name
     *
     * @internal
     *
     * @return string
     */
    abstract public function getAlgorithm();
}

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