mcs/class/referencesource/mscorlib/system/security/cryptography/sha1cryptoserviceprovider.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 // <OWNER>Microsoft</OWNER>
   7 //
   8
   9 //
  10 // SHA1CryptoServiceProvider.cs
  11 //
  12
  13 namespace System.Security.Cryptography {
  14 [System.Runtime.InteropServices.ComVisible(true)]
  15     public sealed class SHA1CryptoServiceProvider : SHA1
  16     {
  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 SHA1CryptoServiceProvider() {
  26             // _CreateHash will check for failures and throw the appropriate exception
  27             _safeHashHandle = Utils.CreateHash(Utils.StaticProvHandle, Constants.CALG_SHA1);
  28         }
  29
  30         [System.Security.SecuritySafeCritical] // overrides public transparent member
  31         protected override void Dispose(bool disposing)
  32         {
  33             if (_safeHashHandle != null && !_safeHashHandle.IsClosed)
  34                 _safeHashHandle.Dispose();
  35             // call the base class's Dispose
  36             base.Dispose(disposing);
  37         }
  38
  39         //
  40         // public methods
  41         //
  42
  43         [System.Security.SecuritySafeCritical]  // auto-generated
  44         public override void Initialize() {
  45             if (_safeHashHandle != null && !_safeHashHandle.IsClosed)
  46                 _safeHashHandle.Dispose();
  47
  48             // _CreateHash will check for failures and throw the appropriate exception
  49             _safeHashHandle = Utils.CreateHash(Utils.StaticProvHandle, Constants.CALG_SHA1);
  50         }
  51
  52         [System.Security.SecuritySafeCritical] // overrides protected transparent member
  53         protected override void HashCore(byte[] rgb, int ibStart, int cbSize)
  54         {
  55             Utils.HashData(_safeHashHandle, rgb, ibStart, cbSize);
  56         }
  57
  58         [System.Security.SecuritySafeCritical] // overrides protected transparent member
  59         protected override byte[] HashFinal()
  60         {
  61             return Utils.EndHash(_safeHashHandle);
  62         }
  63     }
  64 }