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 : TlsHandshakeMessage
  31         {
  32                 #region Fields
  33
  34                 private byte[] random;
  35
  36                 #endregion
  37
  38                 #region Constructors
  39
  40                 public TlsClientHello(TlsContext context)
  41                         : base(context, TlsHandshakeType.ClientHello)
  42                 {
  43                 }
  44
  45                 #endregion
  46
  47                 #region Methods
  48
  49                 public override void Update()
  50                 {
  51                         base.Update();
  52
  53                         this.Context.ClientRandom = random;
  54
  55                         random = null;
  56                 }
  57
  58                 #endregion
  59
  60                 #region Protected Methods
  61
  62                 protected override void ProcessAsSsl3()
  63                 {
  64                         this.ProcessAsTls1();
  65                 }
  66
  67                 protected override void ProcessAsTls1()
  68                 {
  69                         // Client Version
  70                         this.Write((short)this.Context.Protocol);
  71
  72                         // Random bytes - Unix time + Radom bytes [28]
  73                         TlsStream clientRandom = new TlsStream();
  74                         clientRandom.Write(this.Context.GetUnixTime());
  75                         clientRandom.Write(this.Context.GetSecureRandomBytes(28));
  76                         this.random = clientRandom.ToArray();
  77                         clientRandom.Reset();
  78
  79                         this.Write(this.random);
  80
  81                         // Session id
  82                         // Send the session ID empty
  83                         if (this.Context.SessionId != null)
  84                         {
  85                                 this.Write((byte)this.Context.SessionId.Length);
  86                                 if (this.Context.SessionId.Length > 0)
  87                                 {
  88                                         this.Write(this.Context.SessionId);
  89                                 }
  90                         }
  91                         else
  92                         {
  93                                 this.Write((byte)0);
  94                         }
  95
  96                         // Write length of Cipher suites
  97                         this.Write((short)(this.Context.SupportedCiphers.Count*2));
  98
  99                         // Write Supported Cipher suites
 100                         for (int i = 0; i < this.Context.SupportedCiphers.Count; i++)
 101                         {
 102                                 this.Write((short)this.Context.SupportedCiphers[i].Code);
 103                         }
 104
 105                         // Compression methods length
 106                         this.Write((byte)1);
 107
 108                         // Compression methods ( 0 = none )
 109                         this.Write((byte)this.Context.CompressionMethod);
 110                 }
 111
 112                 #endregion
 113         }
 114 }