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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.math;
   29   import java.io;
   30   import sun.security.x509.AlgorithmId;
   31   import sun.security.util;
   32   
   33   
   34   /**
   35    * This class implements the <code>PrivateKeyInfo</code> type,
   36    * which is defined in PKCS #8 as follows:
   37    *
   38    * <pre>
   39    * PrivateKeyInfo ::=  SEQUENCE {
   40    *     version   INTEGER,
   41    *     privateKeyAlgorithm   AlgorithmIdentifier,
   42    *     privateKey   OCTET STRING,
   43    *     attributes   [0] IMPLICIT Attributes OPTIONAL }
   44    * </pre>
   45    *
   46    * @author Jan Luehe
   47    */
   48   final class PrivateKeyInfo {
   49   
   50       // the version number defined by the PKCS #8 standard
   51       private static final BigInteger VERSION = BigInteger.ZERO;
   52   
   53       // the private-key algorithm
   54       private AlgorithmId algid;
   55   
   56       // the private-key value
   57       private byte[] privkey;
   58   
   59       /**
   60        * Constructs a PKCS#8 PrivateKeyInfo from its ASN.1 encoding.
   61        */
   62       PrivateKeyInfo(byte[] encoded) throws IOException {
   63           DerValue val = new DerValue(encoded);
   64   
   65           if (val.tag != DerValue.tag_Sequence)
   66               throw new IOException("private key parse error: not a sequence");
   67   
   68           // version
   69           BigInteger parsedVersion = val.data.getBigInteger();
   70           if (!parsedVersion.equals(VERSION)) {
   71               throw new IOException("version mismatch: (supported: " +
   72                                     VERSION + ", parsed: " + parsedVersion);
   73           }
   74   
   75           // privateKeyAlgorithm
   76           this.algid = AlgorithmId.parse(val.data.getDerValue());
   77   
   78           // privateKey
   79           this.privkey = val.data.getOctetString();
   80   
   81           // OPTIONAL attributes not supported yet
   82       }
   83   
   84       /**
   85        * Returns the private-key algorithm.
   86        */
   87       AlgorithmId getAlgorithm() {
   88           return this.algid;
   89       }
   90   }

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