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<?php
namespace Namshi\JOSE\Signer\OpenSSL;
use Namshi\JOSE\Signer\SignerInterface;
/**
* This class is the base of all HMAC Signers.
*/
abstract class HMAC implements SignerInterface
{
/**
* {@inheritdoc}
*/
public function sign($input, $key)
{
return hash_hmac($this->getHashingAlgorithm(), $input, (string) $key, true);
}
/**
* To prevent timing attacks we are using PHP 5.6 native function hash_equals,
* in case of PHP < 5.6 a timing safe equals comparison function.
*
* more info here:
* http://blog.ircmaxell.com/2014/11/its-all-about-time.html
*
*
* {@inheritdoc}
*/
public function verify($key, $signature, $input)
{
$signedInput = $this->sign($input, $key);
return $this->timingSafeEquals($signedInput, $signature);
}
/**
* A timing safe equals comparison.
*
* @param string $signature the internal signature to be checked
* @param string $signedInput The signed input submitted value
*
* @return bool true if the two strings are identical.
*/
public function timingSafeEquals($known, $input)
{
return hash_equals($known, $input);
}
/**
* Returns the hashing algorithm used in this signer.
*
* @return string
*/
abstract public function getHashingAlgorithm();
}