mcs/class/System.ServiceModel/Mono.Security.Protocol.Tls.Handshake.Server/TlsServerKeyExchange.cs

   1 // Transport Security Layer (TLS)
   2 // Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3
   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 SX509 = System.Security.Cryptography.X509Certificates;
  29
  30 using Mono.Security.Cryptography;
  31 using Mono.Security.X509;
  32
  33 namespace Mono.Security.Protocol.Tls.Handshake.Server
  34 {
  35         internal class TlsServerKeyExchange : HandshakeMessage
  36         {
  37                 #region Constructors
  38
  39                 public TlsServerKeyExchange(Context context)
  40                         : base(context, HandshakeType.ServerKeyExchange)
  41                 {
  42                 }
  43
  44                 #endregion
  45
  46                 #region Methods
  47
  48                 public override void Update()
  49                 {
  50                         throw new NotSupportedException();
  51                 }
  52
  53                 #endregion
  54
  55                 #region Protected Methods
  56
  57                 protected override void ProcessAsSsl3()
  58                 {
  59                         this.ProcessAsTls1();
  60                 }
  61
  62                 protected override void ProcessAsTls1()
  63                 {
  64                         ServerContext context = (ServerContext)this.Context;
  65
  66                         // Select the private key information
  67                         RSA rsa = (RSA)context.SslStream.PrivateKeyCertSelectionDelegate(
  68                                 new SX509.X509Certificate(context.ServerSettings.Certificates[0].RawData),
  69                                 null);
  70
  71                         RSAParameters rsaParams = rsa.ExportParameters(false);
  72
  73                         // Write Modulus
  74                         this.WriteInt24(rsaParams.Modulus.Length);
  75                         this.Write(rsaParams.Modulus, 0, rsaParams.Modulus.Length);
  76
  77                         // Write exponent
  78                         this.WriteInt24(rsaParams.Exponent.Length);
  79                         this.Write(rsaParams.Exponent, 0, rsaParams.Exponent.Length);
  80
  81                         // Write signed params
  82                         byte[] signature = this.createSignature(rsa, this.ToArray());
  83                         this.WriteInt24(signature.Length);
  84                         this.Write(signature);
  85                 }
  86
  87                 #endregion
  88
  89                 #region Private Methods
  90
  91                 private byte[] createSignature(RSA rsa, byte[] buffer)
  92                 {
  93                         MD5SHA1 hash = new MD5SHA1();
  94
  95                         // Create server params array
  96                         TlsStream stream = new TlsStream();
  97
  98                         stream.Write(this.Context.RandomCS);
  99                         stream.Write(buffer, 0, buffer.Length);
 100
 101                         hash.ComputeHash(stream.ToArray());
 102
 103                         stream.Reset();
 104
 105                         return hash.CreateSignature(rsa);
 106                 }
 107
 108                 #endregion
 109         }
 110 }