mcs/class/corlib/System.Security.Cryptography/RSAPKCS1KeyExchangeFormatter.cs

   1 //
   2 // RSAPKCS1KeyExchangeFormatter.cs: Handles PKCS#1 v.1.5 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 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Globalization;
  36 using Mono.Security.Cryptography;
  37
  38 namespace System.Security.Cryptography {
  39
  40         // LAMESPEC: There seems no way to select a hash algorithm. The default
  41         // algorithm, is SHA1 because the class use the PKCS1MaskGenerationMethod -
  42         // which default to SHA1.
  43         public class RSAPKCS1KeyExchangeFormatter: AsymmetricKeyExchangeFormatter
  44         {
  45                 private RSA rsa;
  46                 private RandomNumberGenerator random;
  47
  48                 public RSAPKCS1KeyExchangeFormatter ()
  49                 {
  50                 }
  51
  52                 public RSAPKCS1KeyExchangeFormatter (AsymmetricAlgorithm key)
  53                 {
  54                         SetKey (key);
  55                 }
  56
  57                 public RandomNumberGenerator Rng
  58                 {
  59                         get { return random; }
  60                         set { random = value; }
  61                 }
  62
  63                 public override string Parameters
  64                 {
  65                         get { return "<enc:KeyEncryptionMethod enc:Algorithm=\"http://www.microsoft.com/xml/security/algorithm/PKCS1-v1.5-KeyEx\" xmlns:enc=\"http://www.microsoft.com/xml/security/encryption/v1.0\" />"; }
  66                 }
  67
  68                 public override byte[] CreateKeyExchange (byte[] rgbData)
  69                 {
  70                         if (random == null)
  71                                 random = RandomNumberGenerator.Create ();  // create default
  72                         return PKCS1.Encrypt_v15 (rsa, random, rgbData);
  73                 }
  74
  75                 public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType)
  76                 {
  77                         // documentation says that symAlgType is not used !?!
  78                         return CreateKeyExchange (rgbData);
  79                 }
  80
  81                 public override void SetKey (AsymmetricAlgorithm key)
  82                 {
  83                         rsa = (RSA) key;
  84                 }
  85         }
  86 }