mcs/class/Mono.Security.Win32/Mono.Security.Cryptography/MD5CryptoServiceProvider.cs

   1 //
   2 // Mono.Security.Cryptography.MD5CryptoServiceProvider
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot (spouliot@motus.com)
   6 //
   7 // Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 //
   9
  10 using System;
  11 using System.Security.Cryptography;
  12
  13 namespace Mono.Security.Cryptography {
  14
  15 public class MD5CryptoServiceProvider : MD5 {
  16
  17         private CapiHash hash;
  18
  19         public MD5CryptoServiceProvider ()
  20         {
  21                 hash = null;
  22         }
  23
  24         ~MD5CryptoServiceProvider ()
  25         {
  26                 Dispose (true);
  27         }
  28
  29         // 2 cases:
  30         // a. we were calculing a hash and want to abort
  31         // b. we haven't started yet
  32         public override void Initialize ()
  33         {
  34                 State = 0;
  35                 if (hash == null) {
  36                         hash = new CapiHash (CryptoAPI.CALG_MD5);
  37                 }
  38         }
  39
  40         protected override void Dispose (bool disposing)
  41         {
  42                 if (hash != null) {
  43                         hash.Dispose ();
  44                         hash = null;
  45                         // there's no unmanaged resources (so disposing isn't used)
  46                 }
  47         }
  48
  49         protected override void HashCore (byte[] rgb, int ibStart, int cbSize)
  50         {
  51                 if (State == 0)
  52                         Initialize ();
  53                 if (hash == null)
  54                         throw new ObjectDisposedException ("MD5CryptoServiceProvider");
  55                 State = 1;
  56                 hash.HashCore (rgb, ibStart, cbSize);
  57         }
  58
  59         protected override byte[] HashFinal ()
  60         {
  61                 if (hash == null)
  62                         throw new ObjectDisposedException ("MD5CryptoServiceProvider");
  63                 State = 0;
  64                 byte[] result = hash.HashFinal ();
  65                 Dispose (false);
  66                 return result;
  67         }
  68 }
  69
  70 }