/**
* Create a HOTP URI for use with Google Authenticator.
*
* Note that this is not a URI for the QR code used by Google Authenticator.
* The URI produced by this method is used as the actual content of the QR
* code, and follows a special set of conventions understood by Google
* Authenticator, and other OTP apps.
*
* @param HotpConfigurationInterface $configuration The HOTP configuration.
* @param CounterBasedOtpSharedParametersInterface $shared The shared parameters.
* @param string $label The label for the account.
* @param string|null $issuer The issuer name.
* @param boolean|null $issuerInLabel True if legacy issuer support should be enabled by prefixing the label with the issuer name.
*
* @return string The HOTP URI.
*/
public function createHotp(HotpConfigurationInterface $configuration, CounterBasedOtpSharedParametersInterface $shared, $label, $issuer = null, $issuerInLabel = null)
{
if (1 === $shared->counter()) {
$parameters = '';
} else {
$parameters = '&counter=' . rawurlencode($shared->counter());
}
return $this->buildUri('hotp', $parameters, $configuration, $shared, $label, $issuer, $issuerInLabel);
}
/**
* 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));
}
