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// --- BEGIN COPYRIGHT BLOCK ---
// This program 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; version 2 of the License.
//
// This program 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; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.provider;
import java.util.*;
import java.io.*;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.ProviderException;
import java.security.AlgorithmParameters;
import java.security.spec.DSAParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import java.security.interfaces.DSAParams;
import netscape.security.x509.X509Key;
import netscape.security.x509.AlgIdDSA;
import netscape.security.util.BigInt;
import netscape.security.util.DerValue;
import netscape.security.util.DerInputStream;
import netscape.security.util.DerOutputStream;
/**
* An X.509 public key for the Digital Signature Algorithm.
*
* @author Benjamin Renaud
*
* @version 1.52, 97/12/10
*
* @see DSAPrivateKey
* @see AlgIdDSA
* @see DSA
*/
public final class DSAPublicKey extends X509Key
implements java.security.interfaces.DSAPublicKey, Serializable {
/** use serialVersionUID from JDK 1.1. for interoperability */
private static final long serialVersionUID = -2994193307391104133L;
/* the public key */
private BigInteger y;
/*
* Keep this constructor for backwards compatibility with JDK1.1.
*/
public DSAPublicKey() {
}
/**
* Make a DSA public key out of a public key and three parameters.
*/
public DSAPublicKey(BigInteger y, BigInteger p, BigInteger q,
BigInteger g)
throws InvalidKeyException {
this.y = y;
algid = new AlgIdDSA(p, q, g);
try {
key = new DerValue(DerValue.tag_Integer,
y.toByteArray()).toByteArray();
encode();
} catch (IOException e) {
throw new InvalidKeyException("could not DER encode y: " +
e.getMessage());
}
}
/**
* Make a DSA public key from its DER encoding (X.509).
*/
public DSAPublicKey(byte[] encoded) throws InvalidKeyException {
decode(encoded);
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = (DSAParameterSpec)algParams.getParameterSpec
(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Get the raw public value, y, without the parameters.
*
*/
public BigInteger getY() {
return y;
}
public String toString() {
return "Sun DSA Public Key\n Parameters:" + algid
+ "\n y:\n" + (new BigInt(y)).toString() + "\n";
}
protected void parseKeyBits() throws InvalidKeyException {
try {
DerInputStream in = new DerInputStream(key);
y = in.getInteger().toBigInteger();
} catch (IOException e) {
throw new InvalidKeyException("Invalid key: y value\n" +
e.getMessage());
}
}
}
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