1 /* Transport Security Layer (TLS)
2 * Copyright (c) 2003-2004 Carlos Guzman Alvarez
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
17 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
27 namespace Mono.Security.Protocol.Tls.Handshake.Client
29 internal class TlsServerHello : TlsHandshakeMessage
33 private SecurityCompressionType compressionMethod;
34 private byte[] random;
35 private byte[] sessionId;
36 private CipherSuite cipherSuite;
42 public TlsServerHello(Context context, byte[] buffer)
43 : base(context, TlsHandshakeType.ServerHello, buffer)
51 public override void Update()
55 this.Context.SessionId = this.sessionId;
56 this.Context.ServerRandom = this.random;
57 this.Context.Cipher = this.cipherSuite;
58 this.Context.CompressionMethod = this.compressionMethod;
59 this.Context.Cipher.Context = this.Context;
60 this.Context.ProtocolNegotiated = true;
62 // Compute ClientRandom + ServerRandom
63 TlsStream random = new TlsStream();
64 random.Write(this.Context.ClientRandom);
65 random.Write(this.Context.ServerRandom);
66 this.Context.RandomCS = random.ToArray();
68 // Server Random + Client Random
70 random.Write(this.Context.ServerRandom);
71 random.Write(this.Context.ClientRandom);
73 this.Context.RandomSC = random.ToArray();
79 #region Protected Methods
81 protected override void ProcessAsSsl3()
86 protected override void ProcessAsTls1()
88 // Read protocol version
89 this.processProtocol(this.ReadInt16());
91 // Read random - Unix time + Random bytes
92 this.random = this.ReadBytes(32);
95 int length = (int)ReadByte();
98 this.sessionId = this.ReadBytes(length);
102 short cipherCode = this.ReadInt16();
103 if (this.Context.SupportedCiphers.IndexOf(cipherCode) == -1)
105 // The server has sent an invalid ciphersuite
106 throw new TlsException("Invalid cipher suite received from server");
108 this.cipherSuite = this.Context.SupportedCiphers[cipherCode];
110 // Read compression methods ( always 0 )
111 this.compressionMethod = (SecurityCompressionType)this.ReadByte();
116 #region Private Methods
118 private void processProtocol(short protocol)
120 SecurityProtocolType serverProtocol = this.Context.DecodeProtocolCode(protocol);
122 if ((serverProtocol & this.Context.SecurityProtocolFlags) == serverProtocol ||
123 (this.Context.SecurityProtocolFlags & SecurityProtocolType.Default) == SecurityProtocolType.Default)
125 this.Context.SecurityProtocol = serverProtocol;
126 this.Context.SupportedCiphers.Clear();
127 this.Context.SupportedCiphers = null;
128 this.Context.SupportedCiphers = TlsCipherSuiteFactory.GetSupportedCiphers(serverProtocol);
132 throw this.Context.CreateException("Incorrect protocol version received from server");