Quick heads up, i know this is a duplicate but the answers did not help me.
So im trying to make an AES and RSA encrypted connection, so i can encrypt very large stuff, However upon decrypting something with AES, I`m met with garbage in the beginning of the data, Here is my code (yes i tried hardcoding the IV):
RSA rsa = RSA.Create();
rsa.KeySize = 1024;
Aes aes = Aes.Create();
aes.IV = Encoding.UTF8.GetBytes("1234567890123456");
byte[] sendBytes = null;
byte[] buffer = new byte[1024];
TcpClient client = new TcpClient();
client.Connect(new IPEndPoint(IPAddress.Loopback, 900));
NetworkStream ns = client.GetStream();
ns.Write(Encoding.UTF8.GetBytes(rsa.ToXmlString(false) + "$"), 0, (rsa.ToXmlString(false) + "$").Length);
ns.Read(buffer, 0, buffer.Length);
MessageBox.Show(Encoding.UTF8.GetString(buffer));
rsa.FromXmlString(Encoding.UTF8.GetString(buffer).Split('$')[0]);
ns.Write(Encoding.UTF8.GetBytes(Convert.ToBase64String(rsa.Encrypt(aes.Key, RSAEncryptionPadding.Pkcs1)) + "$"), 0, (Convert.ToBase64String(rsa.Encrypt(aes.Key, RSAEncryptionPadding.Pkcs1)) + "$").Length);
MessageBox.Show(Convert.ToBase64String(rsa.Encrypt(aes.Key, RSAEncryptionPadding.Pkcs1)));
ICryptoTransform encrypt = aes.CreateEncryptor();
sendBytes = Encoding.UTF8.GetBytes("*" + Convert.ToBase64String(encrypt.TransformFinalBlock(Encoding.UTF8.GetBytes(authResult.AccessToken), 0, authResult.AccessToken.Length)) + "|" + Convert.ToBase64String(aes.IV) + "$");
ns.Write(sendBytes, 0, ("*" + Convert.ToBase64String(encrypt.TransformFinalBlock(Encoding.UTF8.GetBytes(authResult.AccessToken), 0, authResult.AccessToken.Length)) + "|" + Convert.ToBase64String(aes.IV) + "$").Length);
sendBytes = Encoding.UTF8.GetBytes(Convert.ToBase64String(encrypt.TransformFinalBlock(Encoding.UTF8.GetBytes(authResult.Account.Username), 0, authResult.Account.Username.Length)) + "$");
ns.Write(sendBytes, 0, (Convert.ToBase64String(encrypt.TransformFinalBlock(Encoding.UTF8.GetBytes(authResult.Account.Username), 0, authResult.Account.Username.Length)) + "$").Length);
ns.Dispose();
client.Close();
This is the server:
NetworkStream networkStream = clientSocket.GetStream();
networkStream.Read(bytesFrom);
string dataFromClient = Encoding.UTF8.GetString(bytesFrom).Split("$")[0];
networkStream.Write(Encoding.UTF8.GetBytes(rsa.ToXmlString(false) + "$"));
rsa.FromXmlString(dataFromClient.Split("$")[0]);
int waste;
rsa.ImportRSAPrivateKey(key, out waste);
Console.WriteLine(rsa.KeySize.ToString());
networkStream.Read(bytesFrom);
Console.WriteLine(Encoding.UTF8.GetString(bytesFrom));
aes.Key = rsa.Decrypt(Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("$")[0]), RSAEncryptionPadding.Pkcs1);
ICryptoTransform decrypt = aes.CreateDecryptor();
networkStream.Read(bytesFrom);
aes.IV = Encoding.UTF8.GetBytes("1234567890123456");
dataFromClient = Encoding.UTF8.GetString(decrypt.TransformFinalBlock(Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("|")[0].Split("*")[1]), 0, Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("|")[0].Split("*")[1]).Length));
Console.WriteLine(Encoding.UTF8.GetString(decrypt.TransformFinalBlock(Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("|")[0].Split("*")[1]), 0, Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("|")[0].Split("*")[1]).Length)));
string info = await GetHttpContentWithToken("https://graph.microsoft.com/v1.0/me", dataFromClient);
Console.WriteLine(info);
Root a = JsonConvert.DeserializeObject<Root>(info);
networkStream.Read(bytesFrom);
dataFromClient = Encoding.UTF8.GetString(decrypt.TransformFinalBlock(Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("$")[0]), 0, Convert.FromBase64String(Encoding.UTF8.GetString(bytesFrom).Split("$")[0]).Length));
(yes im messing with microsoft accounts, you can just ignore everything except for the key exchange and AES decryption code.)
After taking a closer look, i realized i created the decryptor before the IV, sorry about that.