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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 
     18 package javax.crypto.spec;
     19 
     20 import libcore.util.EmptyArray;
     21 
     22 /**
     23  * The source of the label <code>L</code> as specified in <a
     24  * href="http://www.ietf.org/rfc/rfc3447.txt"> PKCS #1</a>.
     25  */
     26 public class PSource {
     27 
     28     private String pSrcName;
     29 
     30     private PSource() {}
     31 
     32     /**
     33      * Creates a new <code>PSource</code> instance with the specified source
     34      * algorithm identifier.
     35      *
     36      * @param pSrcName
     37      *            the source algorithm identifier.
     38      * @throws NullPointerException
     39      *             if pSrcName is null.
     40      */
     41     protected PSource(String pSrcName) {
     42         if (pSrcName == null) {
     43             throw new NullPointerException("pSrcName == null");
     44         }
     45         this.pSrcName = pSrcName;
     46     }
     47 
     48     /**
     49      * Returns the source algorithm identifier.
     50      *
     51      * @return the source algorithm identifier.
     52      */
     53     public String getAlgorithm() {
     54         return pSrcName;
     55     }
     56 
     57     /**
     58      * The explicit specification of the parameter <code>P</code> used in the
     59      * source algorithm.
     60      */
     61     public static final class PSpecified extends PSource {
     62 
     63         private final byte[] p;
     64 
     65         /**
     66          * The instance of <code>PSpecified</code> with the default value
     67          * <code>byte[0]</code> for <code>P</code>
     68          */
     69         public static final PSpecified DEFAULT = new PSpecified();
     70 
     71         private PSpecified() {
     72             super("PSpecified");
     73             p = EmptyArray.BYTE;
     74         }
     75 
     76         /**
     77          * Creates a new instance of <code>PSpecified</code> with the specified
     78          * parameter <code>P</code>.
     79          *
     80          * @param p
     81          *            the parameter <code>P</code>.
     82          * @throws NullPointerException
     83          *             if <code>p</code> is null.
     84          */
     85         public PSpecified(byte[] p) {
     86             super("PSpecified");
     87             if (p == null) {
     88                 throw new NullPointerException("p == null");
     89             }
     90             //TODO: It is unknown which name should be used!
     91             //super("");
     92             this.p = new byte[p.length];
     93             System.arraycopy(p, 0, this.p, 0, p.length);
     94         }
     95 
     96         /**
     97          * Returns a copy of the value of the parameter <code>P</code>.
     98          *
     99          * @return a copy of the value of the parameter <code>P</code>
    100          */
    101         public byte[] getValue() {
    102             byte[] result = new byte[p.length];
    103             System.arraycopy(p, 0, result, 0, p.length);
    104             return result;
    105         }
    106     }
    107 }
    108