Fix for out of bounds exception

[mono.git] / mcs / class / corlib / System.Security.Cryptography / DSASignatureDeformatter.cs

diff --git a/mcs/class/corlib/System.Security.Cryptography/DSASignatureDeformatter.cs b/mcs/class/corlib/System.Security.Cryptography/DSASignatureDeformatter.cs
old mode 100755 (executable)
new mode 100644 (file)
index 4043eb3..6f926b7
--- a/mcs/class/corlib/System.Security.Cryptography/DSASignatureDeformatter.cs
+++ b/mcs/class/corlib/System.Security.Cryptography/DSASignatureDeformatter.cs
@@ -1,47 +1,86 @@
-//\r
-// System.Security.Cryptography DSASignatureDeformatter.cs\r
-//\r
-// Author:\r
-//   Thomas Neidhart (tome@sbox.tugraz.at)\r
-//\r
-\r
-using System;\r
-\r
-namespace System.Security.Cryptography\r
-{\r
-\r
-       /// <summary>\r
-       /// DSA Signature Deformatter\r
-       /// </summary>\r
-       public class DSASignatureDeformatter : AsymmetricSignatureDeformatter\r
-       {\r
-               \r
-               public DSASignatureDeformatter()\r
-               {\r
-                       // TODO: implement\r
-               }\r
-               \r
-               public DSASignatureDeformatter(AsymmetricAlgorithm key)\r
-               {\r
-                       // TODO: implement\r
-               }\r
-               \r
-               public override void SetHashAlgorithm(string strName)\r
-               {\r
-                       throw new CryptographicException("This method is not used");\r
-               }\r
-               \r
-               public override void SetKey(AsymmetricAlgorithm key)\r
-               {\r
-                       // TODO: implement\r
-               }\r
-               \r
-               public override bool VerifySignature(byte[] rgbHash, byte[] rgbSignature)\r
-               {\r
-                       // TODO: implement\r
-                       return false;\r
-               }\r
-               \r
-       } // DSASignatureDeformatter\r
-       \r
-} // System.Security.Cryptography\r
+//
+// System.Security.Cryptography DSASignatureDeformatter.cs
+//
+// Authors:
+//     Thomas Neidhart (tome@sbox.tugraz.at)
+//     Sebastien Pouliot (sebastien@ximian.com)
+//
+// Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
+// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System.Globalization;
+using System.Runtime.InteropServices;
+
+namespace System.Security.Cryptography {
+
+       [ComVisible (true)]
+       public class DSASignatureDeformatter : AsymmetricSignatureDeformatter {
+       
+               private DSA dsa;
+       
+               public DSASignatureDeformatter () : base ()
+               {
+               }
+
+               public DSASignatureDeformatter (AsymmetricAlgorithm key) : base ()
+               {
+                       SetKey (key);
+               }
+
+               public override void SetHashAlgorithm (string strName)
+               {
+                       if (strName == null)
+                               throw new ArgumentNullException ("strName");
+
+                       try {
+                               // just to test, we don't need the object
+                               SHA1.Create (strName);
+                       }
+                       catch (InvalidCastException) {
+                               throw new CryptographicUnexpectedOperationException (
+                                       Locale.GetText ("DSA requires SHA1"));
+                       }
+               }
+
+               public override void SetKey (AsymmetricAlgorithm key)
+               {
+                       if (key != null) {
+                               // this will throw a InvalidCastException if this isn't
+                               // a DSA keypair
+                               dsa = (DSA) key;
+                       }
+                       else
+                               throw new ArgumentNullException ("key");
+               }
+
+               public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
+               {
+                       if (dsa == null) {
+                               throw new CryptographicUnexpectedOperationException (
+                                       Locale.GetText ("missing key"));
+                       }
+
+                       return dsa.VerifySignature (rgbHash, rgbSignature);
+               }
+       }
+}