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 26package com.sun.crypto.provider; 27 28import java.math.*; 29import java.io.*; 30import sun.security.x509.AlgorithmId; 31import 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 */ 48final 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} 91