/**
* Decrypt
*
* @param string $msg
* @param string $privateKey
* @return string
* @throws RuntimeException
*/
public function decrypt(string $msg, string $privateKey = '') : string
{
// get the session key
list($encryptedKey, $ciphertext) = explode(':', $msg, 2);
// decrypt the session key with privateKey
$sessionKey = $this->public->decrypt(base64_decode($encryptedKey), $privateKey);
//openssl_private_decrypt(base64_decode($encryptedKey), $sessionKey, $privateKey, $padding);
// encrypt the plaintext with symmetric algorithm
return $this->symmetric->decrypt($ciphertext, $sessionKey);
}
