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[mono.git] / 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 }