private void KeyExchange()
{
//todo: add handling of an unsuccessful key exchange
ReadServerPublicKey();
AesKeyExchangeRequest keyExchangeRequest = new AesKeyExchangeRequest(aesEncryption.GetKey(), aesEncryption.GetIV(), UserName);
tcpClient.Send(rsa.Encrypt(coding.GetBytes(JsonSerializer.Serialize(keyExchangeRequest)), false));
byte[] rawResponse = tcpClient.GetMessage();
Response response = ParseMessage <Response>(rawResponse, serverKey);
if (response.Code == StatusCode.Ok)
{
userState = UserState.Connected;
}
else
{
Console.WriteLine(response.Message);
}
}
private void KeyExchange()
{
while (true)
{
// send to the client server public key [and other credentials]
tcpClient.Send(server.rsa.ExportRSAPublicKey());
// get key for symmetric encryption from client
byte[] encryptedMessageWithKey = tcpClient.GetMessage();
try
{
byte[] messageWithKeyBytes = server.rsa.Decrypt(encryptedMessageWithKey, false);
string messageWithKeyInJson = coding.Decode(messageWithKeyBytes);
AesKeyExchangeRequest aesKeyExchangeRequest = JsonSerializer.Deserialize <AesKeyExchangeRequest>(messageWithKeyInJson);
aesEncryption.SetKey(aesKeyExchangeRequest.Key);
aesEncryption.SetIV(aesKeyExchangeRequest.IV);
ClientAesKey = aesEncryption.GetKey();
AesKeyExchangeResponse response = new AesKeyExchangeResponse {
Code = StatusCode.Ok,
RequestId = aesKeyExchangeRequest.Id
};
SendMessageAesEncrypted(response, ClientAesKey);
return;
}
catch (Exception exception)
{
Console.WriteLine(exception.Message);
}
}
}
