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 // 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         // LAMESPEC: There seems no way to select a hash algorithm. The default
  37         // algorithm, is SHA1 because the class use the PKCS1MaskGenerationMethod -
  38         // which default to SHA1.
  39         [ComVisible (true)]
  40         public class RSAPKCS1KeyExchangeFormatter: AsymmetricKeyExchangeFormatter
  41         {
  42                 private RSA rsa;
  43                 private RandomNumberGenerator random;
  44
  45                 public RSAPKCS1KeyExchangeFormatter ()
  46                 {
  47                 }
  48
  49                 public RSAPKCS1KeyExchangeFormatter (AsymmetricAlgorithm key)
  50                 {
  51                         SetRSAKey (key);
  52                 }
  53
  54                 public RandomNumberGenerator Rng {
  55                         get { return random; }
  56                         set { random = value; }
  57                 }
  58
  59                 public override string Parameters {
  60                         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\" />"; }
  61                 }
  62
  63                 public override byte[] CreateKeyExchange (byte[] rgbData)
  64                 {
  65                         if (rgbData == null)
  66                                 throw new ArgumentNullException ("rgbData");
  67                         if (rsa == null) {
  68                                 string msg = Locale.GetText ("No RSA key specified");
  69                                 throw new CryptographicUnexpectedOperationException (msg);
  70                         }
  71                         if (random == null)
  72                                 random = RandomNumberGenerator.Create ();  // create default
  73                         return PKCS1.Encrypt_v15 (rsa, random, rgbData);
  74                 }
  75
  76                 public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType)
  77                 {
  78                         // documentation says that symAlgType is not used !?!
  79                         return CreateKeyExchange (rgbData);
  80                 }
  81
  82                 private void SetRSAKey (AsymmetricAlgorithm key)
  83                 {
  84                         if (key == null)
  85                                 throw new ArgumentNullException ("key");
  86                         rsa = (RSA) key;
  87                 }
  88
  89                 public override void SetKey (AsymmetricAlgorithm key)
  90                 {
  91                         SetRSAKey (key);
  92                 }
  93         }
  94 }