mcs/class/Mono.Security/Mono.Security.Protocol.Tls.Handshake.Client/TlsClientHello.cs

   1 /* Transport Security Layer (TLS)
   2  * Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3  *
   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:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  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.
  23  */
  24
  25 using System;
  26 using System.Security.Cryptography;
  27
  28 namespace Mono.Security.Protocol.Tls.Handshake.Client
  29 {
  30         internal class TlsClientHello : HandshakeMessage
  31         {
  32                 #region Fields
  33
  34                 private byte[] random;
  35
  36                 #endregion
  37
  38                 #region Constructors
  39
  40                 public TlsClientHello(Context context)
  41                         : base(context, HandshakeType.ClientHello)
  42                 {
  43                 }
  44
  45                 #endregion
  46
  47                 #region Methods
  48
  49                 public override void Update()
  50                 {
  51                         ClientContext context = (ClientContext)this.Context;
  52
  53                         base.Update();
  54
  55                         context.ClientRandom            = random;
  56                         context.ClientHelloProtocol     = this.Context.Protocol;
  57
  58                         random = null;
  59                 }
  60
  61                 #endregion
  62
  63                 #region Protected Methods
  64
  65                 protected override void ProcessAsSsl3()
  66                 {
  67                         this.ProcessAsTls1();
  68                 }
  69
  70                 protected override void ProcessAsTls1()
  71                 {
  72                         // Client Version
  73                         this.Write(this.Context.Protocol);
  74
  75                         // Random bytes - Unix time + Radom bytes [28]
  76                         TlsStream clientRandom = new TlsStream();
  77                         clientRandom.Write(this.Context.GetUnixTime());
  78                         clientRandom.Write(this.Context.GetSecureRandomBytes(28));
  79                         this.random = clientRandom.ToArray();
  80                         clientRandom.Reset();
  81
  82                         this.Write(this.random);
  83
  84                         // Session id
  85                         // Send the session ID empty
  86                         if (this.Context.SessionId != null)
  87                         {
  88                                 this.Write((byte)this.Context.SessionId.Length);
  89                                 if (this.Context.SessionId.Length > 0)
  90                                 {
  91                                         this.Write(this.Context.SessionId);
  92                                 }
  93                         }
  94                         else
  95                         {
  96                                 this.Write((byte)0);
  97                         }
  98
  99                         // Write length of Cipher suites
 100                         this.Write((short)(this.Context.SupportedCiphers.Count*2));
 101
 102                         // Write Supported Cipher suites
 103                         for (int i = 0; i < this.Context.SupportedCiphers.Count; i++)
 104                         {
 105                                 this.Write((short)this.Context.SupportedCiphers[i].Code);
 106                         }
 107
 108                         // Compression methods length
 109                         this.Write((byte)1);
 110
 111                         // Compression methods ( 0 = none )
 112                         this.Write((byte)this.Context.CompressionMethod);
 113                 }
 114
 115                 #endregion
 116         }
 117 }