class/corlib/System.Security.Cryptography/RSAPKCS1SignatureDeformatter.cs

   1 //
   2 // RSAPKCS1SignatureDeformatter.cs - Handles PKCS#1 v.1.5 signature decryption.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // (C) 2002, 2003 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 RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter {
  38
  39                 private RSA rsa;
  40                 private string hashName;
  41
  42                 public RSAPKCS1SignatureDeformatter ()
  43                 {
  44                 }
  45
  46                 public RSAPKCS1SignatureDeformatter (AsymmetricAlgorithm key)
  47                 {
  48                         SetKey (key);
  49                 }
  50
  51                 public override void SetHashAlgorithm (string strName)
  52                 {
  53                         if (strName == null)
  54                                 throw new ArgumentNullException ("strName");
  55                         hashName = strName;
  56                 }
  57
  58                 public override void SetKey (AsymmetricAlgorithm key)
  59                 {
  60                         if (key == null)
  61                                 throw new ArgumentNullException ("key");
  62                         rsa = (RSA) key;
  63                 }
  64
  65                 public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
  66                 {
  67                         if (rsa == null) {
  68                                 throw new CryptographicUnexpectedOperationException (
  69                                         Locale.GetText ("No public key available."));
  70                         }
  71                         if (hashName == null) {
  72                                 throw new CryptographicUnexpectedOperationException (
  73                                         Locale.GetText ("Missing hash algorithm."));
  74                         }
  75                         if (rgbHash == null)
  76                                 throw new ArgumentNullException ("rgbHash");
  77                         if (rgbSignature == null)
  78                                 throw new ArgumentNullException ("rgbSignature");
  79
  80                         return PKCS1.Verify_v15 (rsa, HashAlgorithm.Create (hashName), rgbHash, rgbSignature);
  81                 }
  82         }
  83 }