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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.io.IOException;
import java.io.Serializable;
import java.math.BigInteger;
import java.security.AlgorithmParameters;
import java.security.InvalidKeyException;
import java.security.interfaces.DSAParams;
import java.security.spec.DSAParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import netscape.security.pkcs.PKCS8Key;
import netscape.security.util.DerInputStream;
import netscape.security.util.DerValue;
import netscape.security.x509.AlgIdDSA;
/**
* A PKCS#8 private key for the Digital Signature Algorithm.
*
* @author Benjamin Renaud
*
* @version 1.47, 97/12/10
*
* @see DSAPublicKey
* @see AlgIdDSA
* @see DSA
*/
public final class DSAPrivateKey extends PKCS8Key
implements java.security.interfaces.DSAPrivateKey, Serializable {
/** use serialVersionUID from JDK 1.1. for interoperability */
private static final long serialVersionUID = -3244453684193605938L;
/* the private key */
private BigInteger x;
/*
* Keep this constructor for backwards compatibility with JDK1.1.
*/
public DSAPrivateKey() {
}
/**
* Make a DSA private key out of a private key and three parameters.
*/
public DSAPrivateKey(BigInteger x, BigInteger p,
BigInteger q, BigInteger g)
throws InvalidKeyException {
this.x = x;
algid = new AlgIdDSA(p, q, g);
try {
key = new DerValue(DerValue.tag_Integer,
x.toByteArray()).toByteArray();
encode();
} catch (IOException e) {
throw new InvalidKeyException("could not DER encode x: " +
e.getMessage());
}
}
/**
* Make a DSA private key from its DER encoding (PKCS #8).
*/
public DSAPrivateKey(byte[] encoded) throws InvalidKeyException {
clearOldKey();
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 private key, x, without the parameters.
*
*/
public BigInteger getX() {
return x;
}
private void clearOldKey() {
int i;
if (this.encodedKey != null) {
for (i = 0; i < this.encodedKey.length; i++) {
this.encodedKey[i] = (byte) 0x00;
}
}
if (this.key != null) {
for (i = 0; i < this.key.length; i++) {
this.key[i] = (byte) 0x00;
}
}
}
public String toString() {
return "Sun DSA Private Key \nparameters:" + algid + "\nx: " +
x.toString(16) + "\n";
}
protected void parseKeyBits() throws InvalidKeyException {
DerInputStream in = new DerInputStream(key);
try {
x = in.getInteger().toBigInteger();
} catch (IOException e) {
throw new InvalidKeyException(e.getMessage());
}
}
}
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