// System.Security.Cryptography.DSA.cs class implementation
//
// Authors:
-// Thomas Neidhart (tome@sbox.tugraz.at)
-// Sebastien Pouliot (spouliot@motus.com)
+// Thomas Neidhart (tome@sbox.tugraz.at)
+// Sebastien Pouliot (sebastien@ximian.com)
//
-// Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
+// Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
+// (C) 2004 Novell (http://www.novell.com)
+//
+
+//
+// Copyright (C) 2004 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;
+using System.Globalization;
using System.Text;
-using System.Xml;
+
+using Mono.Xml;
+using Mono.Security;
// References:
// a. FIPS PUB 186-2: Digital Signature Standard (DSS)
// http://csrc.nist.gov/publications/fips/fips186-2/fips186-2-change1.pdf
-namespace System.Security.Cryptography
-{
- /// <summary>
- /// Abstract base class for all implementations of the DSA algorithm
- /// </summary>
- public abstract class DSA : AsymmetricAlgorithm
- {
- internal DSA () {}
+namespace System.Security.Cryptography {
+
+ public abstract class DSA : AsymmetricAlgorithm {
+
+ // LAMESPEC: It says to derive new DSA implemenation from DSA class.
+ // Well it's aint gonna be easy this way.
+ // RSA constructor is public
+ internal DSA ()
+ {
+ }
public static new DSA Create ()
{
public abstract DSAParameters ExportParameters (bool includePrivateParameters);
- protected void ZeroizePrivateKey (DSAParameters parameters)
+ internal void ZeroizePrivateKey (DSAParameters parameters)
{
if (parameters.X != null)
Array.Clear (parameters.X, 0, parameters.X.Length);
}
+ private byte[] GetNamedParam (SecurityElement se, string param)
+ {
+ SecurityElement sep = se.SearchForChildByTag (param);
+ if (sep == null)
+ return null;
+ return Convert.FromBase64String (sep.Text);
+ }
+
public override void FromXmlString (string xmlString)
{
if (xmlString == null)
- throw new ArgumentNullException ();
+ throw new ArgumentNullException ("xmlString");
DSAParameters dsaParams = new DSAParameters ();
try {
- XmlDocument xml = new XmlDocument ();
- xml.LoadXml (xmlString);
- dsaParams.P = GetElement (xml, "P");
- dsaParams.Q = GetElement (xml, "Q");
- dsaParams.G = GetElement (xml, "G");
- dsaParams.Y = GetElement (xml, "Y");
- dsaParams.J = GetElement (xml, "J");
- dsaParams.Seed = GetElement (xml, "Seed");
- byte[] counter = GetElement (xml, "PgenCounter");
- // else we may have an exception
- byte[] counter4b = new byte[4];
- Array.Copy (counter, 0, counter4b, 0, counter.Length);
- dsaParams.Counter = BitConverter.ToInt32 (counter4b, 0);
- dsaParams.X = GetElement (xml, "X");
+ SecurityParser sp = new SecurityParser ();
+ sp.LoadXml (xmlString);
+ SecurityElement se = sp.ToXml ();
+ if (se.Tag != "DSAKeyValue")
+ throw new Exception ();
+ dsaParams.P = GetNamedParam (se, "P");
+ dsaParams.Q = GetNamedParam (se, "Q");
+ dsaParams.G = GetNamedParam (se, "G");
+ dsaParams.J = GetNamedParam (se, "J");
+ dsaParams.Y = GetNamedParam (se, "Y");
+ dsaParams.X = GetNamedParam (se, "X");
+ dsaParams.Seed = GetNamedParam (se, "Seed");
+ byte[] counter = GetNamedParam (se, "PgenCounter");
+ if (counter != null) {
+ byte[] counter4b = new byte [4]; // always 4 bytes
+ Buffer.BlockCopy (counter, 0, counter4b, 0, counter.Length);
+ dsaParams.Counter = BitConverterLE.ToInt32 (counter4b, 0);
+ }
ImportParameters (dsaParams);
}
catch {
public abstract void ImportParameters (DSAParameters parameters);
+ // note: using SecurityElement.ToXml wouldn't generate the same string as the MS implementation
public override string ToXmlString (bool includePrivateParameters)
{
StringBuilder sb = new StringBuilder ();
sb.Append ("</G>");
sb.Append ("<Y>");
- sb.Append (Convert.ToBase64String( dsaParams.Y));
+ sb.Append (Convert.ToBase64String (dsaParams.Y));
sb.Append( "</Y>");
sb.Append ("<J>");
sb.Append (Convert.ToBase64String (dsaParams.J));
sb.Append ("</J>");
-
- sb.Append ("<Seed>");
- sb.Append (Convert.ToBase64String (dsaParams.Seed));
- sb.Append ("</Seed>");
-
- sb.Append ("<PgenCounter>");
- // the number of bytes is important (no matter == 0x00)
- byte[] inArr = BitConverter.GetBytes (dsaParams.Counter);
- int l = inArr.Length;
- while (inArr[l-1] == 0x00)
- l--;
- byte[] c = new byte[l];
- Array.Copy (inArr, 0, c, 0, l);
- sb.Append (Convert.ToBase64String (c));
- sb.Append ("</PgenCounter>");
+
+ if (dsaParams.Seed != null) {
+ sb.Append ("<Seed>");
+ sb.Append (Convert.ToBase64String (dsaParams.Seed));
+ sb.Append ("</Seed>");
+
+ sb.Append ("<PgenCounter>");
+ // the number of bytes is important (no matter == 0x00)
+ byte[] inArr = BitConverterLE.GetBytes (dsaParams.Counter);
+ int l = inArr.Length;
+ while (inArr[l-1] == 0x00)
+ l--;
+ byte[] c = new byte [l];
+ Buffer.BlockCopy (inArr, 0, c, 0, l);
+ sb.Append (Convert.ToBase64String (c));
+ sb.Append ("</PgenCounter>");
+ }
if (dsaParams.X != null) {
sb.Append ("<X>");
sb.Append (Convert.ToBase64String (dsaParams.X));
sb.Append ("</X>");
}
- else if (includePrivateParameters)
- throw new CryptographicException();
+ else if (includePrivateParameters) {
+ throw new CryptographicException (
+ Locale.GetText ("Missing private key informations"));
+ }
sb.Append ("</DSAKeyValue>");
}
ZeroizePrivateKey (dsaParams);
throw;
}
- finally {
- ZeroizePrivateKey (dsaParams);
- }
return sb.ToString ();
}
public abstract bool VerifySignature (byte[] rgbHash, byte[] rgbSignature);
-
- } // DSA
-
-} // System.Security.Cryptography
+ }
+}
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