Initial revision
From-SVN: r102074
This commit is contained in:
Tom Tromey
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/* DSASignature.java --
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Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.provider;
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import gnu.java.security.der.DER;
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import gnu.java.security.der.DERReader;
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import gnu.java.security.der.DERValue;
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import gnu.java.security.der.DERWriter;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.InvalidParameterException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.SecureRandom;
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import java.security.SignatureException;
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import java.security.SignatureSpi;
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import java.security.interfaces.DSAPrivateKey;
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import java.security.interfaces.DSAPublicKey;
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import java.security.spec.AlgorithmParameterSpec;
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import java.util.ArrayList;
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import java.util.Random;
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public class DSASignature extends SignatureSpi
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{
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private DSAPublicKey publicKey;
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private DSAPrivateKey privateKey;
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private final MessageDigest digest;
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private final SecureRandom random;
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public DSASignature() throws NoSuchAlgorithmException
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{
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random = new SecureRandom();
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digest = MessageDigest.getInstance ("SHA1");
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}
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private void init()
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{
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digest.reset();
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}
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public void engineInitVerify (PublicKey publicKey)
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throws InvalidKeyException
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{
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if (publicKey instanceof DSAPublicKey)
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this.publicKey = (DSAPublicKey) publicKey;
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else
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throw new InvalidKeyException();
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init();
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}
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public void engineInitSign (PrivateKey privateKey)
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throws InvalidKeyException
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{
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if (privateKey instanceof DSAPrivateKey)
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this.privateKey = (DSAPrivateKey) privateKey;
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else
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throw new InvalidKeyException ("not a DSA private key");
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init();
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}
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public void engineInitSign (PrivateKey privateKey,
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SecureRandom random)
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throws InvalidKeyException
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{
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if (privateKey instanceof DSAPrivateKey)
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this.privateKey = (DSAPrivateKey) privateKey;
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else
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throw new InvalidKeyException ("not a DSA private key");
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appRandom = random;
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init();
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}
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public void engineUpdate(byte b)
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throws SignatureException
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{
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digest.update (b);
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}
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public void engineUpdate (byte[] b, int off, int len)
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throws SignatureException
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{
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digest.update (b, off, len);
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}
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public byte[] engineSign() throws SignatureException
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{
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if (privateKey == null)
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throw new SignatureException ("not initialized for signing");
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try
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{
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BigInteger g = privateKey.getParams().getG();
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BigInteger p = privateKey.getParams().getP();
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BigInteger q = privateKey.getParams().getQ();
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BigInteger x = privateKey.getX();
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BigInteger k = new BigInteger (159, appRandom != null ? appRandom : random);
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BigInteger r = g.modPow(k, p);
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r = r.mod(q);
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byte bytes[] = digest.digest();
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BigInteger sha = new BigInteger (1, bytes);
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BigInteger s = sha.add (x.multiply (r));
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s = s.multiply (k.modInverse(q)).mod (q);
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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ArrayList seq = new ArrayList (2);
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seq.add(0, new DERValue (DER.INTEGER, r));
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seq.add(1, new DERValue (DER.INTEGER, s));
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DERWriter.write (bout, new DERValue (DER.CONSTRUCTED | DER.SEQUENCE, seq));
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return bout.toByteArray();
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}
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catch (IOException ioe)
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{
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SignatureException se = new SignatureException();
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se.initCause (ioe);
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throw se;
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}
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catch (ArithmeticException ae)
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{
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SignatureException se = new SignatureException();
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se.initCause (ae);
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throw se;
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}
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}
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public int engineSign (byte[] outbuf, int offset, int len)
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throws SignatureException
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{
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byte tmp[] = engineSign();
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if (tmp.length > len)
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throw new SignatureException ("output buffer too short");
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System.arraycopy (tmp, 0, outbuf, offset, tmp.length);
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return tmp.length;
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}
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public boolean engineVerify (byte[] sigBytes)
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throws SignatureException
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{
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// Decode sigBytes from ASN.1 DER encoding
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try
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{
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DERReader in = new DERReader (sigBytes);
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DERValue val = in.read();
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if (!val.isConstructed())
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throw new SignatureException ("badly formed signature");
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BigInteger r = (BigInteger) in.read().getValue();
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BigInteger s = (BigInteger) in.read().getValue();
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BigInteger g = publicKey.getParams().getG();
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BigInteger p = publicKey.getParams().getP();
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BigInteger q = publicKey.getParams().getQ();
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BigInteger y = publicKey.getY();
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BigInteger w = s.modInverse (q);
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byte bytes[] = digest.digest();
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BigInteger sha = new BigInteger (1, bytes);
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BigInteger u1 = w.multiply (sha).mod ( q );
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BigInteger u2 = r.multiply (w).mod(q);
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BigInteger v = g.modPow (u1, p).multiply (y.modPow (u2, p)).mod (p).mod (q);
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if (v.equals (r))
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return true;
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else
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return false;
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}
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catch (IOException ioe)
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{
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SignatureException se = new SignatureException ("badly formed signature");
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se.initCause (ioe);
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throw se;
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}
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}
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public void engineSetParameter (String param,
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Object value)
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throws InvalidParameterException
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{
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throw new InvalidParameterException();
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}
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public void engineSetParameter (AlgorithmParameterSpec params)
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throws InvalidAlgorithmParameterException
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{
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throw new InvalidParameterException();
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}
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public Object engineGetParameter (String param)
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throws InvalidParameterException
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{
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throw new InvalidParameterException();
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}
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public Object clone() throws CloneNotSupportedException
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{
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return super.clone();
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}
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}
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