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

   1 //
   2 // RSAOAEPKeyExchangeFormatter.cs - Handles OAEP keyex encryption.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   8 // (C) 2004 Novell (http://www.novell.com)
   9 //
  10
  11 using System;
  12 using Mono.Security.Cryptography;
  13
  14 namespace System.Security.Cryptography {
  15
  16         public class RSAOAEPKeyExchangeFormatter : AsymmetricKeyExchangeFormatter {
  17
  18                 private RSA rsa;
  19                 private RandomNumberGenerator random;
  20                 private byte[] param;
  21
  22                 public RSAOAEPKeyExchangeFormatter ()
  23                 {
  24                         rsa = null;
  25                 }
  26
  27                 public RSAOAEPKeyExchangeFormatter (AsymmetricAlgorithm key)
  28                 {
  29                         SetKey (key);
  30                 }
  31
  32                 public byte[] Parameter {
  33                         get { return param; }
  34                         set { param = value; }
  35                 }
  36
  37                 public override string Parameters {
  38                         get { return null; }
  39                 }
  40
  41                 public RandomNumberGenerator Rng {
  42                         get { return random; }
  43                         set { random = value; }
  44                 }
  45
  46                 public override byte[] CreateKeyExchange (byte[] rgbData)
  47                 {
  48                         if (random == null)
  49                                 random = RandomNumberGenerator.Create ();  // create default
  50
  51                         SHA1 sha1 = SHA1.Create ();
  52                         return PKCS1.Encrypt_OAEP (rsa, sha1, random, rgbData);
  53                 }
  54
  55                 public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType)
  56                 {
  57                         // documentation says that symAlgType is not used !?!
  58                         return CreateKeyExchange (rgbData);
  59                 }
  60
  61                 public override void SetKey (AsymmetricAlgorithm key)
  62                 {
  63                         rsa = (RSA) key;
  64                 }
  65         }
  66 }