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 }