mcs/class/Mono.Security/Mono.Security.Protocol.Tls.Handshake.Client/TlsServerKeyExchange.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 \r
  29 namespace Mono.Security.Protocol.Tls.Handshake.Client\r
  30 {\r
  31         internal class TlsServerKeyExchange : TlsHandshakeMessage\r
  32         {\r
  33                 #region FIELDS\r
  34 \r
  35                 private RSAParameters   rsaParams;\r
  36                 private byte[]                  signedParams;\r
  37 \r
  38                 #endregion\r
  39 \r
  40                 #region CONSTRUCTORS\r
  41 \r
  42                 public TlsServerKeyExchange(TlsSession session, byte[] buffer)\r
  43                         : base(session, TlsHandshakeType.ServerKeyExchange, buffer)\r
  44                 {\r
  45                         verify();\r
  46                 }\r
  47 \r
  48                 #endregion\r
  49 \r
  50                 #region METHODS\r
  51 \r
  52                 public override void UpdateSession()\r
  53                 {\r
  54                         base.UpdateSession();\r
  55 \r
  56                         this.Session.Context.ServerSettings.ServerKeyExchange = true;\r
  57                         this.Session.Context.ServerSettings.RsaParameters               = this.rsaParams;\r
  58                         this.Session.Context.ServerSettings.SignedParams                = this.signedParams;\r
  59                 }\r
  60 \r
  61                 #endregion\r
  62 \r
  63                 #region PROTECTED_METHODS\r
  64 \r
  65                 protected override void Parse()\r
  66                 {\r
  67                         rsaParams = new RSAParameters();\r
  68                         \r
  69                         // Read modulus\r
  70                         short length            = ReadInt16();\r
  71                         rsaParams.Modulus       = ReadBytes(length);\r
  72 \r
  73                         // Read exponent\r
  74                         length                          = ReadInt16();\r
  75                         rsaParams.Exponent      = ReadBytes(length);\r
  76 \r
  77                         // Read signed params\r
  78                         length                          = ReadInt16();\r
  79                         signedParams            = ReadBytes(length);\r
  80                 }\r
  81 \r
  82                 #endregion\r
  83 \r
  84                 #region PRIVATE_METHODS\r
  85 \r
  86                 private void verify()\r
  87                 {\r
  88                         MD5CryptoServiceProvider        md5 = new MD5CryptoServiceProvider();\r
  89                         SHA1CryptoServiceProvider       sha = new SHA1CryptoServiceProvider();\r
  90 \r
  91                         // Create server params array\r
  92                         TlsStream stream = new TlsStream();\r
  93 \r
  94                         stream.Write(Session.Context.ClientRandom);\r
  95                         stream.Write(Session.Context.ServerRandom);\r
  96                         stream.Write(rsaParams.Modulus.Length);\r
  97                         stream.Write(rsaParams.Modulus);\r
  98                         stream.Write(rsaParams.Exponent.Length);\r
  99                         stream.Write(rsaParams.Exponent);\r
 100                         byte[] serverParams = stream.ToArray();\r
 101                         stream.Reset();\r
 102 \r
 103                         // Compute md5 and sha hashes\r
 104                         byte[] md5Hash = md5.ComputeHash(serverParams, 0, serverParams.Length);\r
 105                         byte[] shaHash = sha.ComputeHash(serverParams, 0, serverParams.Length);\r
 106 \r
 107                         // Calculate signature\r
 108                         RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(rsaParams.Modulus.Length << 3);\r
 109                         rsa.ImportParameters(rsaParams);\r
 110 \r
 111                         #warning "Verify Signature here"\r
 112 \r
 113                         // RSAPKCS1SignatureDeformatter rsaDeformatter = new RSAPKCS1SignatureDeformatter(rsa);\r
 114                 }\r
 115 \r
 116                 #endregion\r
 117         }\r
 118 }\r