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//
// 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 {
#if NET_2_0
[ComVisible (true)]
#endif
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;
}
#if NET_2_0
else
throw new ArgumentNullException ("key");
#else
// null is accepted in 1.0/1.1
#endif
}
public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
{
if (dsa == null) {
throw new CryptographicUnexpectedOperationException (
Locale.GetText ("missing key"));
}
return dsa.VerifySignature (rgbHash, rgbSignature);
}
}
}
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