public static void ServerKeyExchange(TlsConnection connection)
{
byte[] data = new byte[7 +
TlsConnection.SrpNBytes.Length +
TlsConnection.SrpGBytes.Length +
TlsConnection.SrpSBytes.Length +
connection.SrpB.Length];
//N
data[0] = (byte)(TlsConnection.SrpNBytes.Length >> 8);
data[1] = (byte)TlsConnection.SrpNBytes.Length;
Buffer.BlockCopy(TlsConnection.SrpNBytes, 0, data, 2, TlsConnection.SrpNBytes.Length);
int offset = TlsConnection.SrpNBytes.Length + 2;
//G
data[offset] = (byte)(TlsConnection.SrpGBytes.Length >> 8);
data[offset + 1] = (byte)TlsConnection.SrpGBytes.Length;
Buffer.BlockCopy(TlsConnection.SrpGBytes, 0, data, offset + 2, TlsConnection.SrpGBytes.Length);
offset += TlsConnection.SrpGBytes.Length + 2;
//S
data[offset] = (byte)TlsConnection.SrpSBytes.Length;
Buffer.BlockCopy(TlsConnection.SrpSBytes, 0, data, offset + 1, TlsConnection.SrpSBytes.Length);
offset += TlsConnection.SrpSBytes.Length + 1;
//B
data[offset] = (byte)(connection.SrpB.Length >> 8);
data[offset + 1] = (byte)connection.SrpB.Length;
Buffer.BlockCopy(connection.SrpB, 0, data, offset + 2, connection.SrpB.Length);
TlsResponse.Handshake(connection, 12, ref data);
}
public static void ServerServerFinish(TlsConnection connection)
{
Log.Success("ServerServerFinish", "Finished the transaction!");
var sha256 = SHA256.Create();
var handshakeHash = sha256.ComputeHash(connection.HandshakeMessages.ToArray());
var prfClient = new PseudoRandomFunction(connection.MasterSecretBytes, "server finished", handshakeHash);
byte[] servVerData = prfClient.GenerateBytes(12);
TlsResponse.Handshake(connection, 20, ref servVerData);
}
public static void ServerHello(TlsConnection connection)
{
byte[] data = new byte[]
{
0x03, 0x03 // Version: TLS 1.2
, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
, 0x00 // Session ID length: 0
, 0xc0, 0x1d // Cipher suite: TLS_SRP_SHA_WITH_AES_128_CBC_SHA
, 0x00 // Compression method: null
};
connection.ServerRandom = new byte[32];
Utils.Random.NextBytes(connection.ServerRandom);
Buffer.BlockCopy(connection.ServerRandom, 0, data, 2, 32);
TlsResponse.Handshake(connection, 2, ref data);
}
public static void Post(TlsConnection connection, string request, string body)
{
StringBuilder builder = new StringBuilder("P ", request.Length + body.Length + 24);
builder.Append(request);
builder.Append(" STS/1.0\r\nl:");
builder.Append(body.Length);
builder.Append("\r\n\r\n");
builder.Append(body);
byte[] data = Encoding.ASCII.GetBytes(builder.ToString());
if (connection.SendEncrypted)
{
TlsResponse.Message(connection, ref data);
}
}
private static void Send(TlsConnection connection, string header, string response)
{
StringBuilder builder = new StringBuilder(header, header.Length + response.Length + 24);
builder.Append("\r\nl:");
builder.Append(response.Length);
builder.Append("\r\ns:");
builder.Append(connection.StsSequence);
builder.Append("R\r\n\r\n");
builder.Append(response);
byte[] data = Encoding.ASCII.GetBytes(builder.ToString());
if (connection.SendEncrypted)
{
TlsResponse.Message(connection, ref data);
}
else
{
connection.Send(data);
}
}
public static void ServerChangeCipherSpec(TlsConnection connection)
{
byte[] data = new byte[] { 1 };
TlsResponse.ChangeCipherSpec(connection, ref data);
}
public static void ServerHelloDone(TlsConnection connection)
{
Log.Success("ServerHelloDone", "Finished server hello!");
byte[] data = new byte[0];
TlsResponse.Handshake(connection, 14, ref data);
}