mcs/class/referencesource/mscorlib/system/security/cryptography/md5cryptoserviceprovider.cs

   1 using System.Diagnostics.Contracts;
   2 // ==++==
   3 //
   4 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   5 //
   6 // ==--==
   7 // <OWNER>[....]</OWNER>
   8 //
   9
  10 //
  11 // MD5CryptoServiceProvider.cs
  12 //
  13
  14 namespace System.Security.Cryptography {
  15 [System.Runtime.InteropServices.ComVisible(true)]
  16     public sealed class MD5CryptoServiceProvider : MD5 {
  17         [System.Security.SecurityCritical] // auto-generated
  18         private SafeHashHandle _safeHashHandle = null;
  19
  20         //
  21         // public constructors
  22         //
  23
  24         [System.Security.SecuritySafeCritical]  // auto-generated
  25         public MD5CryptoServiceProvider() {
  26             if (CryptoConfig.AllowOnlyFipsAlgorithms)
  27                 throw new InvalidOperationException(Environment.GetResourceString("Cryptography_NonCompliantFIPSAlgorithm"));
  28             Contract.EndContractBlock();
  29
  30             // _CreateHash will check for failures and throw the appropriate exception
  31             _safeHashHandle = Utils.CreateHash(Utils.StaticProvHandle, Constants.CALG_MD5);
  32         }
  33
  34         [System.Security.SecuritySafeCritical] // overrides public transparent member
  35         protected override void Dispose(bool disposing)
  36         {
  37             if (_safeHashHandle != null && !_safeHashHandle.IsClosed)
  38                 _safeHashHandle.Dispose();
  39             base.Dispose(disposing);
  40         }
  41
  42         //
  43         // public methods
  44         //
  45
  46         [System.Security.SecuritySafeCritical]  // auto-generated
  47         public override void Initialize() {
  48             if (_safeHashHandle != null && !_safeHashHandle.IsClosed)
  49                 _safeHashHandle.Dispose();
  50
  51             // _CreateHash will check for failures and throw the appropriate exception
  52             _safeHashHandle = Utils.CreateHash(Utils.StaticProvHandle, Constants.CALG_MD5);
  53         }
  54
  55         [System.Security.SecuritySafeCritical] // overrides protected transparent member
  56         protected override void HashCore(byte[] rgb, int ibStart, int cbSize)
  57         {
  58             Utils.HashData(_safeHashHandle, rgb, ibStart, cbSize);
  59         }
  60
  61         [System.Security.SecuritySafeCritical] // overrides protected transparent member
  62         protected override byte[] HashFinal() {
  63             return Utils.EndHash(_safeHashHandle);
  64         }
  65     }
  66 }