class/System.ServiceModel/Mono.Security.Protocol.Tls.Handshake.Server/TlsClientFinished.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 using System.Security.Cryptography;
  27
  28 using Mono.Security.Cryptography;
  29
  30 namespace Mono.Security.Protocol.Tls.Handshake.Server
  31 {
  32         internal class TlsClientFinished : HandshakeMessage
  33         {
  34                 #region Constructors
  35
  36                 public TlsClientFinished(Context context, byte[] buffer)
  37                         : base(context, HandshakeType.Finished,  buffer)
  38                 {
  39                 }
  40
  41                 #endregion
  42
  43                 #region Protected Methods
  44
  45                 protected override void ProcessAsSsl3()
  46                 {
  47                         // Compute handshake messages hashes
  48                         HashAlgorithm hash = new SslHandshakeHash(this.Context.MasterSecret);
  49
  50                         TlsStream data = new TlsStream();
  51                         data.Write(this.Context.HandshakeMessages.ToArray());
  52                         data.Write((int)0x434C4E54);
  53
  54                         hash.TransformFinalBlock(data.ToArray(), 0, (int)data.Length);
  55
  56                         data.Reset();
  57
  58                         byte[] clientHash       = this.ReadBytes((int)Length);
  59                         byte[] serverHash       = hash.Hash;
  60
  61                         // Check client prf against server prf
  62                         if (!Compare (clientHash, serverHash))
  63                         {
  64                                 throw new TlsException(AlertDescription.DecryptError, "Decrypt error.");
  65                         }
  66                 }
  67
  68                 protected override void ProcessAsTls1()
  69                 {
  70                         byte[]                  clientPRF               = this.ReadBytes((int)this.Length);
  71                         HashAlgorithm   hash                    = new MD5SHA1();
  72
  73                         byte[] data = this.Context.HandshakeMessages.ToArray ();
  74                         byte[] digest = hash.ComputeHash (data, 0, data.Length);
  75
  76                         byte[] serverPRF = this.Context.Current.Cipher.PRF(
  77                                 this.Context.MasterSecret, "client finished", digest, 12);
  78
  79                         // Check client prf against server prf
  80                         if (!Compare (clientPRF, serverPRF))
  81                         {
  82                                 throw new TlsException(AlertDescription.DecryptError, "Decrypt error.");
  83                         }
  84                 }
  85
  86                 #endregion
  87         }
  88 }