| /* |
| * Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.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 sun.security.x509.X509Key; |
| import sun.security.x509.AlgIdDSA; |
| import sun.security.util.Debug; |
| import sun.security.util.DerValue; |
| import sun.security.util.DerInputStream; |
| import sun.security.util.DerOutputStream; |
| |
| /** |
| * An X.509 public key for the Digital Signature Algorithm. |
| * |
| * @author Benjamin Renaud |
| * |
| * |
| * @see DSAPrivateKey |
| * @see AlgIdDSA |
| * @see DSA |
| */ |
| |
| public 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. |
| * The p, q, and g parameters may be null, but if so, parameters will need |
| * to be supplied from some other source before this key can be used in |
| * cryptographic operations. PKIX RFC2459bis explicitly allows DSA public |
| * keys without parameters, where the parameters are provided in the |
| * issuer's DSA public key. |
| * |
| * @param y the actual key bits |
| * @param p DSA parameter p, may be null if all of p, q, and g are null. |
| * @param q DSA parameter q, may be null if all of p, q, and g are null. |
| * @param g DSA parameter g, may be null if all of p, q, and g are null. |
| */ |
| 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 = algParams.getParameterSpec(DSAParameterSpec.class); |
| return (DSAParams)paramSpec; |
| } |
| } catch (InvalidParameterSpecException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Get the raw public value, y, without the parameters. |
| * |
| * @see getParameters |
| */ |
| public BigInteger getY() { |
| return y; |
| } |
| |
| public String toString() { |
| return "Sun DSA Public Key\n Parameters:" + algid |
| + "\n y:\n" + Debug.toHexString(y) + "\n"; |
| } |
| |
| protected void parseKeyBits() throws InvalidKeyException { |
| try { |
| DerInputStream in = new DerInputStream(key); |
| y = in.getBigInteger(); |
| } catch (IOException e) { |
| throw new InvalidKeyException("Invalid key: y value\n" + |
| e.getMessage()); |
| } |
| } |
| } |