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 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Globalization;
  31 using System.Runtime.InteropServices;
  32 using Mono.Security.Cryptography;
  33
  34 namespace System.Security.Cryptography {
  35
  36         [ComVisible (true)]
  37         public class RSAOAEPKeyExchangeFormatter : AsymmetricKeyExchangeFormatter {
  38
  39                 private RSA rsa;
  40                 private RandomNumberGenerator random;
  41                 private byte[] param;
  42
  43                 public RSAOAEPKeyExchangeFormatter ()
  44                 {
  45                         rsa = null;
  46                 }
  47
  48                 public RSAOAEPKeyExchangeFormatter (AsymmetricAlgorithm key)
  49                 {
  50                         SetKey (key);
  51                 }
  52
  53                 public byte[] Parameter {
  54                         get { return param; }
  55                         set { param = value; }
  56                 }
  57
  58                 public override string Parameters {
  59                         get { return null; }
  60                 }
  61
  62                 public RandomNumberGenerator Rng {
  63                         get { return random; }
  64                         set { random = value; }
  65                 }
  66
  67                 public override byte[] CreateKeyExchange (byte[] rgbData)
  68                 {
  69                         if (random == null)
  70                                 random = RandomNumberGenerator.Create ();  // create default
  71                         if (rsa == null) {
  72                                 string msg = Locale.GetText ("No RSA key specified");
  73                                 throw new CryptographicUnexpectedOperationException (msg);
  74                         }
  75                         SHA1 sha1 = SHA1.Create ();
  76                         return PKCS1.Encrypt_OAEP (rsa, sha1, random, rgbData);
  77                 }
  78
  79                 public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType)
  80                 {
  81                         // documentation says that symAlgType is not used !?!
  82                         return CreateKeyExchange (rgbData);
  83                 }
  84
  85                 public override void SetKey (AsymmetricAlgorithm key)
  86                 {
  87                         rsa = (RSA) key;
  88                 }
  89         }
  90 }