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 (spouliot@motus.com)
   6 //
   7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
   8 //
   9
  10 using System;
  11 using Mono.Security.Cryptography;
  12
  13 namespace System.Security.Cryptography {
  14
  15         public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter {
  16
  17                 private RSA rsa;
  18                 private string hashName;
  19
  20                 public RSAPKCS1SignatureDeformatter ()
  21                 {
  22                         rsa = null;
  23                 }
  24
  25                 public RSAPKCS1SignatureDeformatter (AsymmetricAlgorithm key)
  26                 {
  27                         SetKey (key);
  28                 }
  29
  30                 public override void SetHashAlgorithm (string strName)
  31                 {
  32                         if (strName == null)
  33                                 throw new ArgumentNullException ("strName");
  34                         hashName = strName;
  35                 }
  36
  37                 public override void SetKey (AsymmetricAlgorithm key)
  38                 {
  39                         if (key != null)
  40                                 rsa = (RSA)key;
  41                         // here null is accepted with an ArgumentNullException!
  42                 }
  43
  44                 public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
  45                 {
  46                         if ((rsa == null) || (hashName == null))
  47                                 throw new CryptographicUnexpectedOperationException ();
  48                         if ((rgbHash == null) || (rgbSignature == null))
  49                                 throw new ArgumentNullException ();
  50
  51                         string oid = CryptoConfig.MapNameToOID (hashName);
  52                         return PKCS1.Verify_v15 (rsa, oid, rgbHash, rgbSignature);
  53                 }
  54         }
  55 }