package gnu.testlet.gnu.crypto.sig.dss;

// ----------------------------------------------------------------------------
// $Id: TestOfDSSSignature.java,v 1.4 2005/10/06 04:24:20 rsdio Exp $
//
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING.  If not, write to the
//
//    Free Software Foundation Inc.,
//    51 Franklin Street, Fifth Floor,
//    Boston, MA 02110-1301
//    USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library.  Thus, the terms and
// conditions of the GNU General Public License cover the whole
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// you permission to link this library with independent modules to
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// ----------------------------------------------------------------------------

// Tags: GNU-CRYPTO

import gnu.crypto.hash.IMessageDigest;
import gnu.crypto.hash.Sha160;
import gnu.crypto.key.dss.DSSKeyPairGenerator;
import gnu.crypto.sig.BaseSignature;
import gnu.crypto.sig.dss.DSSSignature;
import gnu.testlet.TestHarness;
import gnu.testlet.Testlet;

import java.security.KeyPair;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.util.HashMap;
import java.math.BigInteger;

/**
 * <p>Conformance tests for the DSS signature generation/verification
 * implementation.</p>
 *
 * @version $Revision: 1.4 $
 */
public class TestOfDSSSignature implements Testlet {

   // Constants and variables
   // -------------------------------------------------------------------------

   // Constructor(s)
   // -------------------------------------------------------------------------

   // default 0-arguments constructor

   // Class methods
   // -------------------------------------------------------------------------

   // Instance methods
   // -------------------------------------------------------------------------

   public void test(TestHarness harness) {
      harness.checkPoint("TestOfDSSSignature");
      DSSKeyPairGenerator kpg = new DSSKeyPairGenerator();
      HashMap map = new HashMap();
      map.put(DSSKeyPairGenerator.MODULUS_LENGTH, new Integer(512));
      map.put(DSSKeyPairGenerator.USE_DEFAULTS, new Boolean(false));
      kpg.setup(map);
      KeyPair kp = kpg.generate();

      DSAPublicKey publicK = (DSAPublicKey) kp.getPublic();
      DSAPrivateKey privateK = (DSAPrivateKey) kp.getPrivate();

      DSSSignature alice = new DSSSignature();
      DSSSignature bob = (DSSSignature) alice.clone();

      byte[] message = "1 if by land, 2 if by sea...".getBytes();

      map.put(BaseSignature.SIGNER_KEY, privateK);
      alice.setupSign(map);
      alice.update(message, 0, message.length);
      Object signature = alice.sign();

      map.put(BaseSignature.VERIFIER_KEY, publicK);
      bob.setupVerify(map);
      bob.update(message, 0, message.length);

      harness.check(bob.verify(signature), "instance methods");

      IMessageDigest sha = new Sha160();
      sha.update(message, 0, message.length);
      byte[] hash = sha.digest();
      BigInteger[] rs = DSSSignature.sign(privateK, hash);

      harness.check(DSSSignature.verify(publicK, hash, rs), "class methods");
   }
}