2 // System.Security.Cryptography DSASignatureDeformatter.cs
5 // Thomas Neidhart (tome@sbox.tugraz.at)
6 // Sebastien Pouliot (sebastien@ximian.com)
8 // Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
9 // (C) 2004 Novell (http://www.novell.com)
13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 using System.Globalization;
38 namespace System.Security.Cryptography {
40 public class DSASignatureDeformatter : AsymmetricSignatureDeformatter {
44 public DSASignatureDeformatter () : base ()
48 public DSASignatureDeformatter (AsymmetricAlgorithm key) : base ()
53 public override void SetHashAlgorithm (string strName)
56 throw new ArgumentNullException ("strName");
59 // just to test, we don't need the object
60 SHA1 hash = SHA1.Create (strName);
62 catch (InvalidCastException) {
63 throw new CryptographicUnexpectedOperationException (
64 Locale.GetText ("DSA requires SHA1"));
68 public override void SetKey (AsymmetricAlgorithm key)
71 // this will throw a InvalidCastException if this isn't
75 // here null is accepted!
78 public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
81 throw new CryptographicUnexpectedOperationException (
82 Locale.GetText ("missing key"));
85 return dsa.VerifySignature (rgbHash, rgbSignature);