1/* 2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package sun.security.provider; 27 28import java.math.BigInteger; 29import java.security.KeyRep; 30import java.security.InvalidKeyException; 31 32/** 33 * An X.509 public key for the Digital Signature Algorithm. 34 * 35 * The difference between DSAPublicKeyImpl and DSAPublicKey is that 36 * DSAPublicKeyImpl calls writeReplace with KeyRep, and DSAPublicKey 37 * calls writeObject. 38 * 39 * See the comments in DSAKeyFactory, 4532506, and 6232513. 40 * 41 */ 42 43public final class DSAPublicKeyImpl extends DSAPublicKey { 44 45 private static final long serialVersionUID = 7819830118247182730L; 46 47 /** 48 * Make a DSA public key out of a public key and three parameters. 49 * The p, q, and g parameters may be null, but if so, parameters will need 50 * to be supplied from some other source before this key can be used in 51 * cryptographic operations. PKIX RFC2459bis explicitly allows DSA public 52 * keys without parameters, where the parameters are provided in the 53 * issuer's DSA public key. 54 * 55 * @param y the actual key bits 56 * @param p DSA parameter p, may be null if all of p, q, and g are null. 57 * @param q DSA parameter q, may be null if all of p, q, and g are null. 58 * @param g DSA parameter g, may be null if all of p, q, and g are null. 59 */ 60 public DSAPublicKeyImpl(BigInteger y, BigInteger p, BigInteger q, 61 BigInteger g) 62 throws InvalidKeyException { 63 super(y, p, q, g); 64 } 65 66 /** 67 * Make a DSA public key from its DER encoding (X.509). 68 */ 69 public DSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException { 70 super(encoded); 71 } 72 73 protected Object writeReplace() throws java.io.ObjectStreamException { 74 return new KeyRep(KeyRep.Type.PUBLIC, 75 getAlgorithm(), 76 getFormat(), 77 getEncoded()); 78 } 79} 80