/**
*
* @see \CryptoUtil\PBE\PBEScheme::decryptWithKey()
* @throws \UnexpectedValueException If decryption failed
* @return string
*/
public function decryptWithKey($data, $key)
{
if (strlen($key) !== 16) {
throw new \UnexpectedValueException("Invalid key length.");
}
try {
$algo = $this->_cipher->withInitializationVector(substr($key, 8, 8));
$str = $this->_crypto->decrypt($data, substr($key, 0, 8), $algo);
return $this->_removePadding($str, 8);
} catch (\RuntimeException $e) {
throw new \UnexpectedValueException("Decryption failed.", null, $e);
}
}
/**
* Get OpenSSL cipher method for given cipher algorithm identifier.
*
* @param CipherAlgorithmIdentifier $algo
* @throws \UnexpectedValueException
* @return string
*/
protected function _algoToCipher(CipherAlgorithmIdentifier $algo)
{
$oid = $algo->oid();
if (array_key_exists($oid, self::MAP_CIPHER_OID_TO_NAME)) {
return self::MAP_CIPHER_OID_TO_NAME[$oid];
}
if (AlgorithmIdentifier::OID_RC2_CBC == $oid) {
if (!$algo instanceof RC2CBCAlgorithmIdentifier) {
throw new \UnexpectedValueException("Not an RC2-CBC algorithm.");
}
return $this->_rc2AlgoToCipher($algo);
}
throw new \UnexpectedValueException("Cipher method " . $algo->oid() . " not supported.");
}
