/**
* Get signature algorithm identifier of given asymmetric cryptographic type
* utilizing given hash algorithm.
*
* @param AlgorithmIdentifier $crypto_algo Cryptographic algorithm
* identifier, eg. RSA or EC
* @param HashAlgorithmIdentifier $hash_algo Hash algorithm identifier
* @throws \UnexpectedValueException
* @return SignatureAlgorithmIdentifier
*/
public static function algoForAsymmetricCrypto(AlgorithmIdentifier $crypto_algo, HashAlgorithmIdentifier $hash_algo)
{
switch ($crypto_algo->oid()) {
case AlgorithmIdentifier::OID_RSA_ENCRYPTION:
$oid = self::_oidForRSA($hash_algo);
break;
case AlgorithmIdentifier::OID_EC_PUBLIC_KEY:
$oid = self::_oidForEC($hash_algo);
break;
default:
throw new \UnexpectedValueException("Crypto algorithm " . $crypto_algo->name() . " not supported.");
}
$cls = AlgorithmIdentifier::MAP_OID_TO_CLASS[$oid];
return new $cls();
}
