/* * Copyright (c) 2003, 2007, 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 javax.crypto.spec; import java.math.BigInteger;import java.security.spec.AlgorithmParameterSpec; /** * This class specifies the source for encoding input P in OAEP Padding, * as defined in the * <a href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1</a> * standard. * <pre> * PKCS1PSourceAlgorithms    ALGORITHM-IDENTIFIER ::= { *   { OID id-pSpecified PARAMETERS OCTET STRING }, *   ...  -- Allows for future expansion -- * } * </pre> * @author Valerie Peng * * @since 1.5 */public class PSource {     private String pSrcName;     /**     * Constructs a source of the encoding input P for OAEP     * padding as defined in the PKCS #1 standard using the     * specified PSource algorithm.     * @param pSrcName the algorithm for the source of the     * encoding input P.     * @exception NullPointerException if <code>pSrcName</code>     * is null.     */    protected PSource(String pSrcName) {        if (pSrcName == null) {            throw new NullPointerException("pSource algorithm is null");        }        this.pSrcName = pSrcName;    }    /**     * Returns the PSource algorithm name.     *     * @return the PSource algorithm name.     */    public String getAlgorithm() {        return pSrcName;    }     /**     * This class is used to explicitly specify the value for     * encoding input P in OAEP Padding.     *     * @since 1.5     */    public static final class PSpecified extends PSource {         private byte[] p = new byte[0];         /**         * The encoding input P whose value equals byte[0].         */        public static final PSpecified DEFAULT = new PSpecified(new byte[0]);         /**         * Constructs the source explicitly with the specified         * value <code>p</code> as the encoding input P.         * Note:         * @param p the value of the encoding input. The contents         * of the array are copied to protect against subsequent         * modification.         * @exception NullPointerException if <code>p</code> is null.         */        public PSpecified(byte[] p) {            super("PSpecified");            this.p = (byte[]) p.clone();        }        /**         * Returns the value of encoding input P.         * @return the value of encoding input P. A new array is         * returned each time this method is called.         */        public byte[] getValue() {            return (p.length==0? p: (byte[])p.clone());        }    }}