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 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Globalization;
33 namespace System.Security.Cryptography {
35 public class DSASignatureDeformatter : AsymmetricSignatureDeformatter {
39 public DSASignatureDeformatter () : base ()
43 public DSASignatureDeformatter (AsymmetricAlgorithm key) : base ()
48 public override void SetHashAlgorithm (string strName)
51 throw new ArgumentNullException ("strName");
54 // just to test, we don't need the object
55 SHA1.Create (strName);
57 catch (InvalidCastException) {
58 throw new CryptographicUnexpectedOperationException (
59 Locale.GetText ("DSA requires SHA1"));
63 public override void SetKey (AsymmetricAlgorithm key)
66 // this will throw a InvalidCastException if this isn't
72 throw new ArgumentNullException ("key");
74 // null is accepted in 1.0/1.1
78 public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
81 throw new CryptographicUnexpectedOperationException (
82 Locale.GetText ("missing key"));
85 return dsa.VerifySignature (rgbHash, rgbSignature);