mcs/class/Mono.Security/Mono.Security.Cryptography/MD4.cs

   1 //
   2 // MD4.cs - Message Digest 4 Abstract class
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (sebastien@xamarin.com)
   6 //
   7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // Copyright 2013 Xamarin Inc. (http://www.xamarin.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Security.Cryptography;
  34
  35 namespace Mono.Security.Cryptography {
  36
  37 #if INSIDE_SYSTEM
  38         internal
  39 #else
  40         public
  41 #endif
  42         abstract class MD4 : HashAlgorithm {
  43
  44                 protected MD4 ()
  45                 {
  46                         // MD4 hash length are 128 bits long
  47                         HashSizeValue = 128;
  48                 }
  49
  50                 public static new MD4 Create ()
  51                 {
  52 #if FULL_AOT_RUNTIME
  53                         return new MD4Managed ();
  54 #else
  55                         // for this to work we must register ourself with CryptoConfig
  56                         return Create ("MD4");
  57 #endif
  58                 }
  59
  60                 public static new MD4 Create (string hashName)
  61                 {
  62                         object o = CryptoConfig.CreateFromName (hashName);
  63                         // in case machine.config isn't configured to use any MD4 implementation
  64                         if (o == null) {
  65                                 o = new MD4Managed ();
  66                         }
  67                         return (MD4) o;
  68                 }
  69         }
  70 }