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    1   /*
    2    * Copyright (c) 1998, 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 com.sun.crypto.provider;
   27   
   28   import java.io;
   29   import sun.security.x509.AlgorithmId;
   30   import sun.security.util;
   31   
   32   /**
   33    * This class implements the <code>EncryptedPrivateKeyInfo</code> type,
   34    * which is defined in PKCS #8 as follows:
   35    *
   36    * <pre>
   37    * EncryptedPrivateKeyInfo ::=  SEQUENCE {
   38    *     encryptionAlgorithm   AlgorithmIdentifier,
   39    *     encryptedData   OCTET STRING }
   40    * </pre>
   41    *
   42    * @author Jan Luehe
   43    */
   44   final class EncryptedPrivateKeyInfo {
   45   
   46       // the "encryptionAlgorithm" field
   47       private AlgorithmId algid;
   48   
   49       // the "encryptedData" field
   50       private byte[] encryptedData;
   51   
   52       // the ASN.1 encoded contents of this class
   53       private byte[] encoded;
   54   
   55       /**
   56        * Constructs (i.e., parses) an <code>EncryptedPrivateKeyInfo</code> from
   57        * its encoding.
   58        */
   59       EncryptedPrivateKeyInfo(byte[] encoded) throws IOException {
   60           DerValue val = new DerValue(encoded);
   61   
   62           DerValue[] seq = new DerValue[2];
   63   
   64           seq[0] = val.data.getDerValue();
   65           seq[1] = val.data.getDerValue();
   66   
   67           if (val.data.available() != 0) {
   68               throw new IOException("overrun, bytes = " + val.data.available());
   69           }
   70   
   71           this.algid = AlgorithmId.parse(seq[0]);
   72           if (seq[0].data.available() != 0) {
   73               throw new IOException("encryptionAlgorithm field overrun");
   74           }
   75   
   76           this.encryptedData = seq[1].getOctetString();
   77           if (seq[1].data.available() != 0)
   78               throw new IOException("encryptedData field overrun");
   79   
   80           this.encoded = (byte[])encoded.clone();
   81       }
   82   
   83       /**
   84        * Constructs an <code>EncryptedPrivateKeyInfo</code> from the
   85        * encryption algorithm and the encrypted data.
   86        */
   87       EncryptedPrivateKeyInfo(AlgorithmId algid, byte[] encryptedData) {
   88           this.algid = algid;
   89           this.encryptedData = (byte[])encryptedData.clone();
   90           this.encoded = null; // lazy generation of encoding
   91       }
   92   
   93       /**
   94        * Returns the encryption algorithm.
   95        */
   96       AlgorithmId getAlgorithm() {
   97           return this.algid;
   98       }
   99   
  100       /**
  101        * Returns the encrypted data.
  102        */
  103       byte[] getEncryptedData() {
  104           return (byte[])this.encryptedData.clone();
  105       }
  106   
  107       /**
  108        * Returns the ASN.1 encoding of this class.
  109        */
  110       byte[] getEncoded()
  111           throws IOException
  112       {
  113           if (this.encoded != null) return (byte[])this.encoded.clone();
  114   
  115           DerOutputStream out = new DerOutputStream();
  116           DerOutputStream tmp = new DerOutputStream();
  117   
  118           // encode encryption algorithm
  119           algid.encode(tmp);
  120   
  121           // encode encrypted data
  122           tmp.putOctetString(encryptedData);
  123   
  124           // wrap everything into a SEQUENCE
  125           out.write(DerValue.tag_Sequence, tmp);
  126           this.encoded = out.toByteArray();
  127   
  128           return (byte[])this.encoded.clone();
  129       }
  130   }

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