/**
* Generate an HOTP value.
*
* @link http://tools.ietf.org/html/rfc4226#section-5.3
*
* @param HotpConfigurationInterface $configuration The configuration to use for generation.
* @param CounterBasedOtpSharedParametersInterface $shared The shared parameters to use for generation.
*
* @return HotpValueInterface The generated HOTP value.
*/
public function generateHotp(HotpConfigurationInterface $configuration, CounterBasedOtpSharedParametersInterface $shared)
{
return new HotpValue(hash_hmac($configuration->algorithm()->value(), $this->pack($shared->counter()), $shared->secret(), true));
}