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

   1 /* Transport Security Layer (TLS)\r
   2  * Copyright (c) 2003 Carlos Guzmán Álvarez\r
   3  * \r
   4  * Permission is hereby granted, free of charge, to any person \r
   5  * obtaining a copy of this software and associated documentation \r
   6  * files (the "Software"), to deal in the Software without restriction, \r
   7  * including without limitation the rights to use, copy, modify, merge, \r
   8  * publish, distribute, sublicense, and/or sell copies of the Software, \r
   9  * and to permit persons to whom the Software is furnished to do so, \r
  10  * subject to the following conditions:\r
  11  * \r
  12  * The above copyright notice and this permission notice shall be included \r
  13  * in all copies or substantial portions of the Software.\r
  14  * \r
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, \r
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES \r
  17  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND \r
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT \r
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, \r
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, \r
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER \r
  22  * DEALINGS IN THE SOFTWARE.\r
  23  */\r
  24 \r
  25 using System;\r
  26 using System.Security.Cryptography;\r
  27 \r
  28 namespace Mono.Security.Protocol.Tls.Handshake.Client\r
  29 {\r
  30         internal class TlsClientHello : TlsHandshakeMessage\r
  31         {\r
  32                 #region FIELDS\r
  33 \r
  34                 private byte[] random;\r
  35 \r
  36                 #endregion\r
  37 \r
  38                 #region CONSTRUCTORS\r
  39 \r
  40                 public TlsClientHello(TlsSession session) \r
  41                         : base(session, TlsHandshakeType.ClientHello, TlsContentType.Handshake)\r
  42                 {\r
  43                 }\r
  44 \r
  45                 #endregion\r
  46 \r
  47                 #region METHODS\r
  48 \r
  49                 public override void UpdateSession()\r
  50                 {\r
  51                         base.UpdateSession();\r
  52 \r
  53                         Session.Context.ClientRandom = random;\r
  54 \r
  55                         random = null;\r
  56                 }\r
  57 \r
  58                 #endregion\r
  59 \r
  60                 #region PROTECTED_METHODS\r
  61 \r
  62                 protected override void ProcessAsSsl3()\r
  63                 {\r
  64                         this.ProcessAsTls1();\r
  65                 }\r
  66 \r
  67                 protected override void ProcessAsTls1()\r
  68                 {\r
  69                         // Client Version\r
  70                         this.Write((short)this.Session.Context.Protocol);\r
  71                                                                 \r
  72                         // Random bytes - Unix time + Radom bytes [28]\r
  73                         TlsStream clientRandom = new TlsStream();\r
  74                         clientRandom.Write(this.Session.Context.GetUnixTime());\r
  75                         clientRandom.Write(this.Session.Context.GetSecureRandomBytes(28));\r
  76                         this.random = clientRandom.ToArray();\r
  77                         clientRandom.Reset();\r
  78 \r
  79                         this.Write(this.random);\r
  80 \r
  81                         // Session id\r
  82                         // Send the session ID empty\r
  83                         if (this.Session.SessionId != null)\r
  84                         {\r
  85                                 this.Write((byte)this.Session.SessionId.Length);\r
  86                                 if (this.Session.SessionId.Length > 0)\r
  87                                 {\r
  88                                         this.Write(this.Session.SessionId);\r
  89                                 }\r
  90                         }\r
  91                         else\r
  92                         {\r
  93                                 this.Write((byte)0);\r
  94                         }\r
  95                         \r
  96                         // Write length of Cipher suites                        \r
  97                         this.Write((short)(this.Session.Context.SupportedCiphers.Count*2));\r
  98 \r
  99                         // Write Supported Cipher suites\r
 100                         for (int i = 0; i < this.Session.Context.SupportedCiphers.Count; i++)\r
 101                         {\r
 102                                 this.Write((short)this.Session.Context.SupportedCiphers[i].Code);\r
 103                         }\r
 104 \r
 105                         // Compression methods length\r
 106                         this.Write((byte)1);\r
 107                         \r
 108                         // Compression methods ( 0 = none )\r
 109                         this.Write((byte)this.Session.Context.CompressionMethod);\r
 110                 }\r
 111 \r
 112                 #endregion\r
 113         }\r
 114 }