mcs/class/corlib/System.Security.Cryptography/KeySizes.cs

   1 //
   2 // System.Security.Cryptography KeySizes Class implementation
   3 //
   4 // Authors:
   5 //      Matthew S. Ford (Matthew.S.Ford@Rose-Hulman.Edu)
   6 //      Ben Maurer (bmaurer@users.sf.net)
   7 //      Sebastien Pouliot (sebastien@ximian.com)
   8 //
   9 // Copyright 2001 by Matthew S. Ford.
  10 // (C) 2004 Novell (http://www.novell.com)
  11 //
  12
  13 //
  14 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 namespace System.Security.Cryptography {
  37
  38 #if NET_1_0
  39         public class KeySizes {
  40 #else
  41         public sealed class KeySizes {
  42 #endif
  43                 private int _maxSize;
  44                 private int _minSize;
  45                 private int _skipSize;
  46
  47                 public KeySizes (int minSize, int maxSize, int skipSize)
  48                 {
  49                         _maxSize = maxSize;
  50                         _minSize = minSize;
  51                         _skipSize = skipSize;
  52                 }
  53
  54                 public int MaxSize {
  55                         get { return _maxSize; }
  56                 }
  57
  58                 public int MinSize {
  59                         get { return _minSize; }
  60                 }
  61
  62                 public int SkipSize {
  63                         get { return _skipSize; }
  64                 }
  65
  66                 internal bool IsLegal (int keySize)
  67                 {
  68                         int ks = keySize - MinSize;
  69                         bool result = ((ks >= 0) && (keySize <= MaxSize));
  70                         return ((SkipSize == 0) ? result : (result && (ks % SkipSize == 0)));
  71                 }
  72
  73                 internal static bool IsLegalKeySize (KeySizes[] legalKeys, int size)
  74                 {
  75                         foreach (KeySizes legalKeySize in legalKeys) {
  76                                 if (legalKeySize.IsLegal (size))
  77                                         return true;
  78                         }
  79                         return false;
  80                 }
  81         }
  82 }