mcs/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 // (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         public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter {
  41
  42                 private RSA rsa;
  43                 private string hashName;
  44
  45                 public RSAPKCS1SignatureDeformatter ()
  46                 {
  47                 }
  48
  49                 public RSAPKCS1SignatureDeformatter (AsymmetricAlgorithm key)
  50                 {
  51                         SetKey (key);
  52                 }
  53
  54                 public override void SetHashAlgorithm (string strName)
  55                 {
  56                         if (strName == null)
  57                                 throw new ArgumentNullException ("strName");
  58                         hashName = strName;
  59                 }
  60
  61                 public override void SetKey (AsymmetricAlgorithm key)
  62                 {
  63                         rsa = (RSA) key;
  64                         // here null is accepted without an ArgumentNullException!
  65                 }
  66
  67                 public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
  68                 {
  69                         if (rsa == null) {
  70                                 throw new CryptographicUnexpectedOperationException (
  71                                         Locale.GetText ("No public key available."));
  72                         }
  73                         if (hashName == null) {
  74                                 throw new CryptographicUnexpectedOperationException (
  75                                         Locale.GetText ("Missing hash algorithm."));
  76                         }
  77                         if (rgbHash == null)
  78                                 throw new ArgumentNullException ("rgbHash");
  79                         if (rgbSignature == null)
  80                                 throw new ArgumentNullException ("rgbSignature");
  81
  82                         return PKCS1.Verify_v15 (rsa, HashAlgorithm.Create (hashName), rgbHash, rgbSignature);
  83                 }
  84         }
  85 }