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    1   /*
    2    * Copyright (c) 2003, 2007, 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   
   26   package javax.crypto.spec;
   27   
   28   import java.math.BigInteger;
   29   import java.security.spec.AlgorithmParameterSpec;
   30   
   31   /**
   32    * This class specifies the source for encoding input P in OAEP Padding,
   33    * as defined in the
   34    * <a href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1</a>
   35    * standard.
   36    * <pre>
   37    * PKCS1PSourceAlgorithms    ALGORITHM-IDENTIFIER ::= {
   38    *   { OID id-pSpecified PARAMETERS OCTET STRING },
   39    *   ...  -- Allows for future expansion --
   40    * }
   41    * </pre>
   42    * @author Valerie Peng
   43    *
   44    * @since 1.5
   45    */
   46   public class PSource {
   47   
   48       private String pSrcName;
   49   
   50       /**
   51        * Constructs a source of the encoding input P for OAEP
   52        * padding as defined in the PKCS #1 standard using the
   53        * specified PSource algorithm.
   54        * @param pSrcName the algorithm for the source of the
   55        * encoding input P.
   56        * @exception NullPointerException if <code>pSrcName</code>
   57        * is null.
   58        */
   59       protected PSource(String pSrcName) {
   60           if (pSrcName == null) {
   61               throw new NullPointerException("pSource algorithm is null");
   62           }
   63           this.pSrcName = pSrcName;
   64       }
   65       /**
   66        * Returns the PSource algorithm name.
   67        *
   68        * @return the PSource algorithm name.
   69        */
   70       public String getAlgorithm() {
   71           return pSrcName;
   72       }
   73   
   74       /**
   75        * This class is used to explicitly specify the value for
   76        * encoding input P in OAEP Padding.
   77        *
   78        * @since 1.5
   79        */
   80       public static final class PSpecified extends PSource {
   81   
   82           private byte[] p = new byte[0];
   83   
   84           /**
   85            * The encoding input P whose value equals byte[0].
   86            */
   87           public static final PSpecified DEFAULT = new PSpecified(new byte[0]);
   88   
   89           /**
   90            * Constructs the source explicitly with the specified
   91            * value <code>p</code> as the encoding input P.
   92            * Note:
   93            * @param p the value of the encoding input. The contents
   94            * of the array are copied to protect against subsequent
   95            * modification.
   96            * @exception NullPointerException if <code>p</code> is null.
   97            */
   98           public PSpecified(byte[] p) {
   99               super("PSpecified");
  100               this.p = (byte[]) p.clone();
  101           }
  102           /**
  103            * Returns the value of encoding input P.
  104            * @return the value of encoding input P. A new array is
  105            * returned each time this method is called.
  106            */
  107           public byte[] getValue() {
  108               return (p.length==0? p: (byte[])p.clone());
  109           }
  110       }
  111   }

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