public string DecodeAndDecryptMessage(string msg)
{
RSAManager RSAKeys = new RSAManager(Helper.GetPublicKey().RSAParameters, Helper.GetPrivateKey());
Message message = AuthenticateMessage(msg);
//Decipher symm key to decipher the content
string keyToDecipher = RSAKeys.Decrypt(message.KeyToDecipher);
KeyDecipher keyDecipher = JsonConvert.DeserializeObject <KeyDecipher>(keyToDecipher);
//Decipher content
AesManager aesManager = new AesManager();
aesManager.Update(keyDecipher.Key, keyDecipher.IV);
byte[] content = JsonConvert.DeserializeObject <byte[]>(message.Cryptotext);
string Content = aesManager.DecryptStringFromBytes_Aes(content);
JsonFreshMessage jsonFreshMessage = JsonConvert.DeserializeObject <JsonFreshMessage>(Content);
VerifyNonce(jsonFreshMessage.Nonce);
return(jsonFreshMessage.Message);
}
public string JsonMessage(string msg)
{
RSAManager RSAKeys = new RSAManager(Helper.GetPcPublicKey());
AesManager aesManager = new AesManager();
//Cipher content with the symmetric key
byte[] bytes = aesManager.EncryptStringToBytes_Aes(msg);
string cipherText = JsonConvert.SerializeObject(bytes);
//Cipher the symmetric key with pub key
KeyDecipher keyDecipher = new KeyDecipher(aesManager.Key, aesManager.InitVect);
string KeyDecipher = JsonConvert.SerializeObject(keyDecipher);
string cipheredKey = RSAKeys.Encrypt(KeyDecipher);
//The cipherText and cipherKey
Message message = new Message(cipherText, cipheredKey);
string Message = JsonConvert.SerializeObject(message);
//Digest the message
HMACManager DigestKey = new HMACManager(Helper.GetDigestKey());
return(JsonConvert.SerializeObject(new JsonCryptoDigestMessage(Message, DigestKey.Encode(Message))));
}