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diff --git a/libjava/gnu/java/security/provider/DSASignature.java b/libjava/gnu/java/security/provider/DSASignature.java
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-/* DSASignature.java --
- Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath 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 Classpath 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 GNU Classpath; 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
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package gnu.java.security.provider;
-
-import gnu.java.security.der.DER;
-import gnu.java.security.der.DERReader;
-import gnu.java.security.der.DERValue;
-import gnu.java.security.der.DERWriter;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.math.BigInteger;
-import java.security.InvalidAlgorithmParameterException;
-import java.security.InvalidKeyException;
-import java.security.InvalidParameterException;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.PrivateKey;
-import java.security.PublicKey;
-import java.security.SecureRandom;
-import java.security.SignatureException;
-import java.security.SignatureSpi;
-import java.security.interfaces.DSAPrivateKey;
-import java.security.interfaces.DSAPublicKey;
-import java.security.spec.AlgorithmParameterSpec;
-import java.util.ArrayList;
-import java.util.Random;
-
-public class DSASignature extends SignatureSpi
-{
- private DSAPublicKey publicKey;
- private DSAPrivateKey privateKey;
- private final MessageDigest digest;
- private final SecureRandom random;
-
- public DSASignature() throws NoSuchAlgorithmException
- {
- random = new SecureRandom();
- digest = MessageDigest.getInstance ("SHA1");
- }
-
- private void init()
- {
- digest.reset();
- }
-
- public void engineInitVerify (PublicKey publicKey)
- throws InvalidKeyException
- {
- if (publicKey instanceof DSAPublicKey)
- this.publicKey = (DSAPublicKey) publicKey;
- else
- throw new InvalidKeyException();
- init();
- }
-
- public void engineInitSign (PrivateKey privateKey)
- throws InvalidKeyException
- {
- if (privateKey instanceof DSAPrivateKey)
- this.privateKey = (DSAPrivateKey) privateKey;
- else
- throw new InvalidKeyException ("not a DSA private key");
-
- init();
- }
-
- public void engineInitSign (PrivateKey privateKey,
- SecureRandom random)
- throws InvalidKeyException
- {
- if (privateKey instanceof DSAPrivateKey)
- this.privateKey = (DSAPrivateKey) privateKey;
- else
- throw new InvalidKeyException ("not a DSA private key");
-
- appRandom = random;
- init();
- }
-
- public void engineUpdate(byte b)
- throws SignatureException
- {
- digest.update (b);
- }
-
- public void engineUpdate (byte[] b, int off, int len)
- throws SignatureException
- {
- digest.update (b, off, len);
- }
-
- public byte[] engineSign() throws SignatureException
- {
- if (privateKey == null)
- throw new SignatureException ("not initialized for signing");
-
- try
- {
- BigInteger g = privateKey.getParams().getG();
- BigInteger p = privateKey.getParams().getP();
- BigInteger q = privateKey.getParams().getQ();
-
- BigInteger x = privateKey.getX();
-
- BigInteger k = new BigInteger (159, appRandom != null ? appRandom : random);
-
- BigInteger r = g.modPow(k, p);
- r = r.mod(q);
-
- byte bytes[] = digest.digest();
- BigInteger sha = new BigInteger (1, bytes);
-
- BigInteger s = sha.add (x.multiply (r));
- s = s.multiply (k.modInverse(q)).mod (q);
-
- ByteArrayOutputStream bout = new ByteArrayOutputStream();
- ArrayList seq = new ArrayList (2);
- seq.add(0, new DERValue (DER.INTEGER, r));
- seq.add(1, new DERValue (DER.INTEGER, s));
- DERWriter.write (bout, new DERValue (DER.CONSTRUCTED | DER.SEQUENCE, seq));
- return bout.toByteArray();
- }
- catch (IOException ioe)
- {
- SignatureException se = new SignatureException();
- se.initCause (ioe);
- throw se;
- }
- catch (ArithmeticException ae)
- {
- SignatureException se = new SignatureException();
- se.initCause (ae);
- throw se;
- }
- }
-
- public int engineSign (byte[] outbuf, int offset, int len)
- throws SignatureException
- {
- byte tmp[] = engineSign();
- if (tmp.length > len)
- throw new SignatureException ("output buffer too short");
- System.arraycopy (tmp, 0, outbuf, offset, tmp.length);
- return tmp.length;
- }
-
- public boolean engineVerify (byte[] sigBytes)
- throws SignatureException
- {
- // Decode sigBytes from ASN.1 DER encoding
- try
- {
- DERReader in = new DERReader (sigBytes);
- DERValue val = in.read();
- if (!val.isConstructed())
- throw new SignatureException ("badly formed signature");
- BigInteger r = (BigInteger) in.read().getValue();
- BigInteger s = (BigInteger) in.read().getValue();
-
- BigInteger g = publicKey.getParams().getG();
- BigInteger p = publicKey.getParams().getP();
- BigInteger q = publicKey.getParams().getQ();
-
- BigInteger y = publicKey.getY();
-
- BigInteger w = s.modInverse (q);
-
- byte bytes[] = digest.digest();
- BigInteger sha = new BigInteger (1, bytes);
-
- BigInteger u1 = w.multiply (sha).mod ( q );
-
- BigInteger u2 = r.multiply (w).mod(q);
-
- BigInteger v = g.modPow (u1, p).multiply (y.modPow (u2, p)).mod (p).mod (q);
-
- if (v.equals (r))
- return true;
- else
- return false;
- }
- catch (IOException ioe)
- {
- SignatureException se = new SignatureException ("badly formed signature");
- se.initCause (ioe);
- throw se;
- }
- }
-
- public void engineSetParameter (String param,
- Object value)
- throws InvalidParameterException
- {
- throw new InvalidParameterException();
- }
-
- public void engineSetParameter (AlgorithmParameterSpec params)
- throws InvalidAlgorithmParameterException
- {
- throw new InvalidParameterException();
-
- }
-
- public Object engineGetParameter (String param)
- throws InvalidParameterException
- {
- throw new InvalidParameterException();
- }
-
- public Object clone() throws CloneNotSupportedException
- {
- return super.clone();
- }
-}
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