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124 lines
3.9 KiB
Java
124 lines
3.9 KiB
Java
/*
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* Copyright (c) 1996, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.provider;
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import java.io.*;
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import java.math.BigInteger;
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import java.security.InvalidKeyException;
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import java.security.AlgorithmParameters;
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import java.security.spec.DSAParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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import java.security.interfaces.DSAParams;
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import java.util.Arrays;
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import sun.security.x509.AlgIdDSA;
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import sun.security.pkcs.PKCS8Key;
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import sun.security.util.DerValue;
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import sun.security.util.DerInputStream;
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/**
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* A PKCS#8 private key for the Digital Signature Algorithm.
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*
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* @author Benjamin Renaud
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*
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*
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* @see DSAPublicKey
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* @see AlgIdDSA
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* @see DSA
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*/
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public final class DSAPrivateKey extends PKCS8Key
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implements java.security.interfaces.DSAPrivateKey, Serializable {
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/** use serialVersionUID from JDK 1.1. for interoperability */
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@java.io.Serial
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private static final long serialVersionUID = -3244453684193605938L;
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/* the private key */
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private final BigInteger x;
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/**
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* Make a DSA private key out of a private key and three parameters.
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*/
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public DSAPrivateKey(BigInteger x, BigInteger p,
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BigInteger q, BigInteger g) {
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this.x = x;
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algid = new AlgIdDSA(p, q, g);
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try {
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byte[] xbytes = x.toByteArray();
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DerValue val = new DerValue(DerValue.tag_Integer, xbytes);
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key = val.toByteArray();
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val.clear();
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Arrays.fill(xbytes, (byte)0);
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} catch (IOException e) {
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throw new AssertionError("Should not happen", e);
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}
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}
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/**
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* Make a DSA private key from its DER encoding (PKCS #8).
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*/
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public DSAPrivateKey(byte[] encoded) throws InvalidKeyException {
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super(encoded);
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try {
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DerInputStream in = new DerInputStream(key);
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x = in.getBigInteger();
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} catch (IOException e) {
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throw new InvalidKeyException(e.getMessage(), e);
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}
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}
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/**
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* Returns the DSA parameters associated with this key, or null if the
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* parameters could not be parsed.
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*/
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public DSAParams getParams() {
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try {
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if (algid instanceof DSAParams) {
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return (DSAParams)algid;
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} else {
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DSAParameterSpec paramSpec;
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AlgorithmParameters algParams = algid.getParameters();
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if (algParams == null) {
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return null;
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}
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paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
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return paramSpec;
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}
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} catch (InvalidParameterSpecException e) {
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return null;
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}
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}
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/**
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* Get the raw private key, x, without the parameters.
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*/
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public BigInteger getX() {
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return x;
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}
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}
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