/// <summary>
/// Creates the server side cipher to use.
/// </summary>
/// <returns>Server cipher.</returns>
public Cipher CreateServerCipher()
{
// Resolve Session ID
var sessionId = Session.SessionId ?? ExchangeHash;
// Calculate server to client initial IV
var serverVector = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'B', sessionId));
// Calculate server to client encryption
var serverKey = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'D', sessionId));
serverKey = GenerateSessionKey(SharedKey, ExchangeHash, serverKey, _serverCipherInfo.KeySize / 8);
// Create server cipher
return(_serverCipherInfo.Cipher(serverKey, serverVector));
}
/// <summary>
/// Creates the client side cipher to use.
/// </summary>
/// <returns>Client cipher.</returns>
public Cipher CreateClientCipher()
{
// Resolve Session ID
var sessionId = Session.SessionId ?? ExchangeHash;
// Calculate client to server initial IV
var clientVector = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'A', sessionId));
// Calculate client to server encryption
var clientKey = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'C', sessionId));
clientKey = GenerateSessionKey(SharedKey, ExchangeHash, clientKey, _clientCipherInfo.KeySize / 8);
// Create client cipher
return(_clientCipherInfo.Cipher(clientKey, clientVector));
}
/// <summary>
/// Creates the server side cipher to use.
/// </summary>
/// <returns>Server cipher.</returns>
public Cipher CreateServerCipher()
{
// Resolve Session ID
var sessionId = Session.SessionId ?? ExchangeHash;
// Calculate server to client initial IV
var serverVector = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'B', sessionId));
// Calculate server to client encryption
var serverKey = Hash(GenerateSessionKey(SharedKey, ExchangeHash, 'D', sessionId));
serverKey = GenerateSessionKey(SharedKey, ExchangeHash, serverKey, _serverCipherInfo.KeySize / 8);
DiagnosticAbstraction.Log(string.Format("[{0}] Creating server cipher (Name:{1},Key:{2},IV:{3})",
Session.ToHex(Session.SessionId),
Session.ConnectionInfo.CurrentServerEncryption,
Session.ToHex(serverKey),
Session.ToHex(serverVector)));
// Create server cipher
return(_serverCipherInfo.Cipher(serverKey, serverVector));
}
