static function getEncryptionObject($algo)
{
$modes = '(CBC|ECB|CFB|OFB|CTR)';
switch (true) {
case preg_match("#^AES-(128|192|256)-{$modes}\$#", $algo, $matches):
$cipher = new AES(self::getEncryptionMode($matches[2]));
$cipher->setKeyLength($matches[1]);
return $cipher;
case preg_match("#^DES-EDE3-{$modes}\$#", $algo, $matches):
return new TripleDES(self::getEncryptionMode($matches[1]));
case preg_match("#^DES-{$modes}\$#", $algo, $matches):
return new DES(self::getEncryptionMode($matches[1]));
default:
throw new \UnexpectedValueException('Unsupported encryption algorithmn');
}
}