/**
* Calculate a base 64 encoded SHA256 HMAC according to the rules at
* https://docs.adyen.com/developers/hpp-manual#hmacpaymentsetupsha256
*
* @param GatewayType $adapter
* @param array $values
* @return string
*/
public static function calculateSignature(GatewayType $adapter, $values)
{
$ignoredKeys = array('sig', 'merchantSig', 'title', 'liberated');
foreach (array_keys($values) as $key) {
if (substr($key, 0, 7) === 'ignore.' || in_array($key, $ignoredKeys)) {
unset($values[$key]);
} else {
// escape colons and backslashes
$values[$key] = str_replace('\\', '\\\\', $values[$key]);
$values[$key] = str_replace(':', '\\:', $values[$key]);
}
}
ksort($values, SORT_STRING);
$merged = array_merge(array_keys($values), array_values($values));
$joined = implode(':', $merged);
$secret = $adapter->getAccountConfig('SharedSecret');
return base64_encode(hash_hmac('sha256', $joined, pack("H*", $secret), true));
}
public static function calculateSignature(GatewayType $adapter, $message)
{
$key = $adapter->getAccountConfig('SecretKey');
return strtoupper(hash_hmac('sha256', pack('A*', $message), pack('A*', $key)));
}