class/System.Core/System.Security.Cryptography/CngAlgorithmGroup.cs

   1 //
   2 // System.Security.Cryptography.CngAlgorithmGroup
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2008 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30
  31 namespace System.Security.Cryptography {
  32
  33         // note: CNG stands for "Cryptography API: Next Generation"
  34
  35         [Serializable]
  36         public sealed class CngAlgorithmGroup : IEquatable<CngAlgorithmGroup> {
  37
  38                 private string group;
  39
  40                 public CngAlgorithmGroup (string algorithmGroup)
  41                 {
  42                         if (algorithmGroup == null)
  43                                 throw new ArgumentNullException ("algorithmGroup");
  44                         if (algorithmGroup.Length == 0)
  45                                 throw new ArgumentException ("algorithmGroup");
  46
  47                         group = algorithmGroup;
  48                 }
  49
  50                 public string AlgorithmGroup {
  51                         get { return group; }
  52                 }
  53
  54                 public bool Equals (CngAlgorithmGroup other)
  55                 {
  56                         return this == other;
  57                 }
  58
  59                 public override bool Equals (object obj)
  60                 {
  61                         return Equals (obj as CngAlgorithmGroup);
  62                 }
  63
  64                 public override int GetHashCode ()
  65                 {
  66                         return group.GetHashCode ();
  67                 }
  68
  69                 public override string ToString ()
  70                 {
  71                         return group;
  72                 }
  73
  74                 // static
  75
  76                 private static CngAlgorithmGroup dh;
  77                 private static CngAlgorithmGroup dsa;
  78                 private static CngAlgorithmGroup ecdh;
  79                 private static CngAlgorithmGroup ecdsa;
  80                 private static CngAlgorithmGroup rsa;
  81
  82                 public static CngAlgorithmGroup DiffieHellman {
  83                         get {
  84                                 if (dh == null)
  85                                         dh = new CngAlgorithmGroup ("DH");
  86                                 return dh;
  87                         }
  88                 }
  89
  90                 public static CngAlgorithmGroup Dsa {
  91                         get {
  92                                 if (dsa == null)
  93                                         dsa = new CngAlgorithmGroup ("DSA");
  94                                 return dsa;
  95                         }
  96                 }
  97
  98                 public static CngAlgorithmGroup ECDiffieHellman {
  99                         get {
 100                                 if (ecdh == null)
 101                                         ecdh = new CngAlgorithmGroup ("ECDH");
 102                                 return ecdh;
 103                         }
 104                 }
 105
 106                 public static CngAlgorithmGroup ECDsa {
 107                         get {
 108                                 if (ecdsa == null)
 109                                         ecdsa = new CngAlgorithmGroup ("ECDSA");
 110                                 return ecdsa;
 111                         }
 112                 }
 113
 114                 public static CngAlgorithmGroup Rsa {
 115                         get {
 116                                 if (rsa == null)
 117                                         rsa = new CngAlgorithmGroup ("RSA");
 118                                 return rsa;
 119                         }
 120                 }
 121
 122                 public static bool operator == (CngAlgorithmGroup left, CngAlgorithmGroup right)
 123                 {
 124                         if ((object)left == null)
 125                                 return ((object)right == null);
 126                         if ((object)right == null)
 127                                 return false;
 128                         return left.group == right.group;
 129                 }
 130
 131                 public static bool operator != (CngAlgorithmGroup left, CngAlgorithmGroup right)
 132                 {
 133                         if ((object)left == null)
 134                                 return ((object)right != null);
 135                         if ((object)right == null)
 136                                 return true;
 137                         return left.group != right.group;
 138                 }
 139         }
 140 }