mcs/class/Mono.Security/Mono.Security.Cryptography/RC4.cs

   1 //
   2 // RC4.cs: RC4(tm) symmetric stream cipher
   3 //      RC4 is a trademark of RSA Security
   4 //
   5 // Author:
   6 //      Sebastien Pouliot (spouliot@motus.com)
   7 //
   8 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   9 //
  10
  11 using System;
  12 using System.Security.Cryptography;
  13
  14 namespace Mono.Security.Cryptography {
  15
  16 public abstract class RC4 : SymmetricAlgorithm {
  17
  18         private static KeySizes[] s_legalBlockSizes = {
  19                 new KeySizes (64, 64, 0)
  20         };
  21
  22         private static KeySizes[] s_legalKeySizes = {
  23                 new KeySizes (40, 2048, 8)
  24         };
  25
  26         public RC4()
  27         {
  28                 KeySizeValue = 128;
  29                 BlockSizeValue = 64;
  30                 FeedbackSizeValue = BlockSizeValue;
  31                 LegalBlockSizesValue = s_legalBlockSizes;
  32                 LegalKeySizesValue = s_legalKeySizes;
  33         }
  34
  35         new static public RC4 Create()
  36         {
  37                 return Create ("RC4");
  38         }
  39
  40         new static public RC4 Create (string algName)
  41         {
  42                 object o = CryptoConfig.CreateFromName (algName);
  43                 // in case machine.config isn't configured to use
  44                 // any RC4 implementation
  45                 if (o == null) {
  46                         o = new ARC4Managed ();
  47                 }
  48                 return (RC4) o;
  49         }
  50 }
  51
  52 }