class/Mono.Security/Mono.Security.Protocol.Tls/RSASslSignatureDeformatter.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 namespace Mono.Security.Protocol.Tls
  29 {
  30         internal class RSASslSignatureDeformatter : AsymmetricSignatureDeformatter
  31         {
  32                 #region Fields
  33
  34                 private RSA                             key;
  35                 private HashAlgorithm   hash;
  36
  37                 #endregion
  38
  39                 #region Constructors
  40
  41                 public RSASslSignatureDeformatter()
  42                 {
  43                 }
  44
  45                 public RSASslSignatureDeformatter(AsymmetricAlgorithm key)
  46                 {
  47                         this.SetKey(key);
  48                 }
  49
  50                 #endregion
  51
  52                 #region Methods
  53
  54                 public override bool VerifySignature(
  55                         byte[] rgbHash,
  56                         byte[] rgbSignature)
  57                 {
  58                         if (this.key == null)
  59                         {
  60                                 throw new CryptographicUnexpectedOperationException("The key is a null reference");
  61                         }
  62                         if (hash == null)
  63                         {
  64                                 throw new CryptographicUnexpectedOperationException("The hash algorithm is a null reference.");
  65                         }
  66                         if (rgbHash == null)
  67                         {
  68                                 throw new ArgumentNullException("The rgbHash parameter is a null reference.");
  69                         }
  70
  71                         return Mono.Security.Cryptography.PKCS1.Verify_v15(
  72                                 this.key,
  73                                 this.hash,
  74                                 rgbHash,
  75                                 rgbSignature);
  76                 }
  77
  78                 public override void SetHashAlgorithm(string strName)
  79                 {
  80                         switch (strName)
  81                         {
  82                                 case "MD5SHA1":
  83                                         this.hash = new Mono.Security.Cryptography.MD5SHA1();
  84                                         break;
  85
  86                                 default:
  87                                         this.hash = HashAlgorithm.Create(strName);
  88                                         break;
  89                         }
  90                 }
  91
  92                 public override void SetKey(AsymmetricAlgorithm key)
  93                 {
  94                         if (!(key is RSA))
  95                         {
  96                                 throw new ArgumentException("Specfied key is not an RSA key");
  97                         }
  98
  99                         this.key = key as RSA;
 100                 }
 101
 102                 #endregion
 103         }
 104 }