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/*
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* Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.crypto.provider;
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import java.math.*;
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import java.io.*;
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import sun.security.x509.AlgorithmId;
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import sun.security.util.*;
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/**
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* This class implements the <code>PrivateKeyInfo</code> type,
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* which is defined in PKCS #8 as follows:
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*
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* <pre>
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* PrivateKeyInfo ::= SEQUENCE {
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* version INTEGER,
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* privateKeyAlgorithm AlgorithmIdentifier,
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* privateKey OCTET STRING,
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* attributes [0] IMPLICIT Attributes OPTIONAL }
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* </pre>
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*
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* @author Jan Luehe
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*/
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final class PrivateKeyInfo {
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// the version number defined by the PKCS #8 standard
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private static final BigInteger VERSION = BigInteger.ZERO;
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// the private-key algorithm
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private AlgorithmId algid;
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// the private-key value
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private byte[] privkey;
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/**
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* Constructs a PKCS#8 PrivateKeyInfo from its ASN.1 encoding.
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*/
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PrivateKeyInfo(byte[] encoded) throws IOException {
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DerValue val = new DerValue(encoded);
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if (val.tag != DerValue.tag_Sequence)
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throw new IOException("private key parse error: not a sequence");
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// version
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BigInteger parsedVersion = val.data.getBigInteger();
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if (!parsedVersion.equals(VERSION)) {
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throw new IOException("version mismatch: (supported: " +
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VERSION + ", parsed: " + parsedVersion);
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}
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// privateKeyAlgorithm
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this.algid = AlgorithmId.parse(val.data.getDerValue());
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// privateKey
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this.privkey = val.data.getOctetString();
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// OPTIONAL attributes not supported yet
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}
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/**
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* Returns the private-key algorithm.
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*/
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AlgorithmId getAlgorithm() {
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return this.algid;
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}
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}
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