mcs/class/Mono.Security/Mono.Security.Cryptography/MD5SHA1.cs

   1 /* Transport Security Layer (TLS)
   2  * Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without restriction,
   7  * including without limitation the rights to use, copy, modify, merge,
   8  * publish, distribute, sublicense, and/or sell copies of the Software,
   9  * and to permit persons to whom the Software is furnished to do so,
  10  * subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  17  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 using System;
  26 using System.Security.Cryptography;
  27
  28 using Mono.Security.Protocol.Tls;
  29
  30 namespace Mono.Security.Cryptography
  31 {
  32         internal class MD5SHA1 : HashAlgorithm
  33         {
  34                 #region Fields
  35
  36                 private HashAlgorithm   md5;
  37                 private HashAlgorithm   sha;
  38                 private bool                    hashing;
  39
  40                 #endregion
  41
  42                 #region Constructors
  43
  44                 public MD5SHA1() : base()
  45                 {
  46                         this.md5 = MD5.Create();
  47                         this.sha = SHA1.Create();
  48
  49                         // Set HashSizeValue
  50                         this.HashSizeValue = this.md5.HashSize + this.sha.HashSize;
  51                 }
  52
  53                 #endregion
  54
  55                 #region Methods
  56
  57                 public override void Initialize()
  58                 {
  59                         this.md5.Initialize();
  60                         this.sha.Initialize();
  61                         this.hashing = false;
  62                 }
  63
  64                 protected override byte[] HashFinal()
  65                 {
  66                         if (!hashing)
  67                         {
  68                                 this.hashing = true;
  69                         }
  70                         // Finalize the original hash
  71                         this.md5.TransformFinalBlock(new byte[0], 0, 0);
  72                         this.sha.TransformFinalBlock(new byte[0], 0, 0);
  73
  74                         byte[] hash = new byte[36];
  75
  76                         Buffer.BlockCopy(this.md5.Hash, 0, hash, 0, 16);
  77                         Buffer.BlockCopy(this.sha.Hash, 0, hash, 16, 20);
  78
  79                         return hash;
  80                 }
  81
  82                 protected override void HashCore(
  83                         byte[] array,
  84                         int ibStart,
  85                         int cbSize)
  86                 {
  87                         if (!hashing)
  88                         {
  89                                 hashing = true;
  90                         }
  91                         this.md5.TransformBlock(array, ibStart, cbSize, array, ibStart);
  92                         this.sha.TransformBlock(array, ibStart, cbSize, array, ibStart);
  93                 }
  94
  95                 public byte[] CreateSignature(RSA rsa)
  96                 {
  97                         if (rsa == null)
  98                         {
  99                                 throw new CryptographicUnexpectedOperationException ("missing key");
 100                         }
 101
 102                         RSASslSignatureFormatter f = new RSASslSignatureFormatter(rsa);
 103                         f.SetHashAlgorithm("MD5SHA1");
 104
 105                         return f.CreateSignature(this.Hash);
 106                 }
 107
 108                 public bool VerifySignature(RSA rsa, byte[] rgbSignature)
 109                 {
 110                         if (rsa == null)
 111                         {
 112                                 throw new CryptographicUnexpectedOperationException ("missing key");
 113                         }
 114                         if (rgbSignature == null)
 115                         {
 116                                 throw new ArgumentNullException ("rgbSignature");
 117                         }
 118
 119                         RSASslSignatureDeformatter d = new RSASslSignatureDeformatter(rsa);
 120                         d.SetHashAlgorithm("MD5SHA1");
 121
 122                         return d.VerifySignature(this.Hash, rgbSignature);
 123                 }
 124
 125                 #endregion
 126         }
 127 }