class/Mono.Security/Mono.Security.Protocol.Tls.Handshake.Server/TlsServerHello.cs

   1 // Transport Security Layer (TLS)
   2 // Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3 // Copyright (C) 2006 Novell, Inc (http://www.novell.com)
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining
   6 // a copy of this software and associated documentation files (the
   7 // "Software"), to deal in the Software without restriction, including
   8 // without limitation the rights to use, copy, modify, merge, publish,
   9 // distribute, sublicense, and/or sell copies of the Software, and to
  10 // permit persons to whom the Software is furnished to do so, subject to
  11 // the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be
  14 // included in all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24
  25 using System;
  26
  27 namespace Mono.Security.Protocol.Tls.Handshake.Server
  28 {
  29         internal class TlsServerHello : HandshakeMessage
  30         {
  31                 #region Private Fields
  32
  33                 private int             unixTime;
  34                 private byte[]  random;
  35
  36                 #endregion
  37
  38                 #region Constructors
  39
  40                 public TlsServerHello(Context context)
  41                         : base(context, HandshakeType.ServerHello)
  42                 {
  43                 }
  44
  45                 #endregion
  46
  47                 #region Methods
  48
  49                 public override void Update()
  50                 {
  51                         base.Update();
  52
  53                         TlsStream random = new TlsStream();
  54
  55                         // Compute Server Random
  56                         random.Write(this.unixTime);
  57                         random.Write(this.random);
  58
  59                         this.Context.ServerRandom = random.ToArray();
  60
  61                         // Compute ClientRandom + ServerRandom
  62                         random.Reset();
  63                         random.Write(this.Context.ClientRandom);
  64                         random.Write(this.Context.ServerRandom);
  65
  66                         this.Context.RandomCS = random.ToArray();
  67
  68                         // Server Random + Client Random
  69                         random.Reset();
  70                         random.Write(this.Context.ServerRandom);
  71                         random.Write(this.Context.ClientRandom);
  72
  73                         this.Context.RandomSC = random.ToArray();
  74
  75                         random.Reset();
  76                 }
  77
  78                 #endregion
  79
  80                 #region Protected Methods
  81
  82                 protected override void ProcessAsSsl3()
  83                 {
  84                         this.ProcessAsTls1();
  85                 }
  86
  87                 protected override void ProcessAsTls1()
  88                 {
  89                         // Write protocol version
  90                         this.Write(this.Context.Protocol);
  91
  92                         // Write Unix time
  93                         this.unixTime = this.Context.GetUnixTime();
  94                         this.Write(this.unixTime);
  95
  96                         // Write Random bytes
  97                         random = this.Context.GetSecureRandomBytes(28);
  98                         this.Write(this.random);
  99
 100                         if (this.Context.SessionId == null)
 101                         {
 102                                 this.WriteByte(0);
 103                         }
 104                         else
 105                         {
 106                                 // Write Session ID length
 107                                 this.WriteByte((byte)this.Context.SessionId.Length);
 108
 109                                 // Write Session ID
 110                                 this.Write(this.Context.SessionId);
 111                         }
 112
 113                         // Write selected cipher suite
 114                         this.Write(this.Context.Negotiating.Cipher.Code);
 115
 116                         // Write selected compression method
 117                         this.WriteByte((byte)this.Context.CompressionMethod);
 118                 }
 119
 120                 #endregion
 121         }
 122 }