mirror of git://gcc.gnu.org/git/gcc.git
252 lines
8.6 KiB
Java
252 lines
8.6 KiB
Java
/* DSSKeyPairPKCS8Codec.java -- PKCS#8 Encoding/Decoding handler
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Copyright (C) 2006, 2010 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.key.dss;
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import gnu.java.security.Configuration;
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import gnu.java.security.OID;
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import gnu.java.security.Registry;
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import gnu.java.security.der.DER;
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import gnu.java.security.der.DERReader;
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import gnu.java.security.der.DERValue;
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import gnu.java.security.der.DERWriter;
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import gnu.java.security.key.IKeyPairCodec;
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import gnu.java.security.util.DerUtil;
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import gnu.java.security.util.Util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.security.InvalidParameterException;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.util.ArrayList;
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import java.util.logging.Logger;
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/**
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* An implementation of an {@link IKeyPairCodec} that knows how to encode /
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* decode PKCS#8 ASN.1 external representation of DSS private keys.
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*
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* @author Casey Marshall (rsdio@metastatic.org)
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*/
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public class DSSKeyPairPKCS8Codec
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implements IKeyPairCodec
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{
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private static final Logger log = Configuration.DEBUG ?
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Logger.getLogger(DSSKeyPairPKCS8Codec.class.getName()) : null;
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private static final OID DSA_ALG_OID = new OID(Registry.DSA_OID_STRING);
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// implicit 0-arguments constructor
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public int getFormatID()
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{
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return PKCS8_FORMAT;
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}
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/**
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* @throws InvalidParameterException ALWAYS.
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*/
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public byte[] encodePublicKey(PublicKey key)
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{
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throw new InvalidParameterException("Wrong format for public keys");
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}
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/**
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* Returns the PKCS#8 ASN.1 <i>PrivateKeyInfo</i> representation of a DSA
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* private key. The ASN.1 specification is as follows:
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*
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* <pre>
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* PrivateKeyInfo ::= SEQUENCE {
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* version INTEGER, -- MUST be 0
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* privateKeyAlgorithm AlgorithmIdentifier,
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* privateKey OCTET STRING
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* }
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*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL
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* }
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*
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* DssParams ::= SEQUENCE {
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* p INTEGER,
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* q INTEGER,
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* g INTEGER
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* }
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* </pre>
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*
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* @return the DER encoded form of the ASN.1 representation of the
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* <i>PrivateKeyInfo</i> field in an X.509 certificate.
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* @throw InvalidParameterException if an error occurs during the marshalling
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* process.
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*/
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public byte[] encodePrivateKey(PrivateKey key)
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{
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if (! (key instanceof DSSPrivateKey))
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throw new InvalidParameterException("Wrong key type");
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DERValue derVersion = new DERValue(DER.INTEGER, BigInteger.ZERO);
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DERValue derOID = new DERValue(DER.OBJECT_IDENTIFIER, DSA_ALG_OID);
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DSSPrivateKey pk = (DSSPrivateKey) key;
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BigInteger p = pk.getParams().getP();
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BigInteger q = pk.getParams().getQ();
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BigInteger g = pk.getParams().getG();
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BigInteger x = pk.getX();
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ArrayList params = new ArrayList(3);
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params.add(new DERValue(DER.INTEGER, p));
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params.add(new DERValue(DER.INTEGER, q));
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params.add(new DERValue(DER.INTEGER, g));
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DERValue derParams = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, params);
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ArrayList algorithmID = new ArrayList(2);
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algorithmID.add(derOID);
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algorithmID.add(derParams);
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DERValue derAlgorithmID = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE,
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algorithmID);
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// The OCTET STRING is the DER encoding of an INTEGER.
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DERValue derX = new DERValue(DER.INTEGER, x);
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DERValue derPrivateKey = new DERValue(DER.OCTET_STRING, derX.getEncoded());
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ArrayList pki = new ArrayList(3);
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pki.add(derVersion);
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pki.add(derAlgorithmID);
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pki.add(derPrivateKey);
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DERValue derPKI = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, pki);
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byte[] result;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try
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{
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DERWriter.write(baos, derPKI);
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result = baos.toByteArray();
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}
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catch (IOException e)
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{
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InvalidParameterException y = new InvalidParameterException(e.getMessage());
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y.initCause(e);
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throw y;
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}
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return result;
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}
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/**
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* @throws InvalidParameterException ALWAYS.
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*/
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public PublicKey decodePublicKey(byte[] input)
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{
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throw new InvalidParameterException("Wrong format for public keys");
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}
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/**
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* @param input the byte array to unmarshall into a valid DSS
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* {@link PrivateKey} instance. MUST NOT be null.
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* @return a new instance of a {@link DSSPrivateKey} decoded from the
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* <i>PrivateKeyInfo</i> material fed as <code>input</code>.
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* @throw InvalidParameterException if an exception occurs during the
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* unmarshalling process.
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*/
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public PrivateKey decodePrivateKey(byte[] input)
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "decodePrivateKey");
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if (input == null)
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throw new InvalidParameterException("Input bytes MUST NOT be null");
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BigInteger version, p, q, g, x;
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DERReader der = new DERReader(input);
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try
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{
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DERValue derPKI = der.read();
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DerUtil.checkIsConstructed(derPKI, "Wrong PrivateKeyInfo field");
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DERValue derVersion = der.read();
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if (! (derVersion.getValue() instanceof BigInteger))
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throw new InvalidParameterException("Wrong Version field");
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version = (BigInteger) derVersion.getValue();
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if (version.compareTo(BigInteger.ZERO) != 0)
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throw new InvalidParameterException("Unexpected Version: " + version);
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DERValue derAlgoritmID = der.read();
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DerUtil.checkIsConstructed(derAlgoritmID, "Wrong AlgorithmIdentifier field");
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DERValue derOID = der.read();
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OID algOID = (OID) derOID.getValue();
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if (! algOID.equals(DSA_ALG_OID))
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throw new InvalidParameterException("Unexpected OID: " + algOID);
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DERValue derParams = der.read();
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DerUtil.checkIsConstructed(derParams, "Wrong DSS Parameters field");
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DERValue val = der.read();
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DerUtil.checkIsBigInteger(val, "Wrong P field");
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p = (BigInteger) val.getValue();
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val = der.read();
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DerUtil.checkIsBigInteger(val, "Wrong Q field");
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q = (BigInteger) val.getValue();
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val = der.read();
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DerUtil.checkIsBigInteger(val, "Wrong G field");
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g = (BigInteger) val.getValue();
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val = der.read();
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if (Configuration.DEBUG)
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log.fine("val = " + val);
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byte[] xBytes = (byte[]) val.getValue();
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if (Configuration.DEBUG)
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log.fine(Util.dumpString(xBytes, "xBytes: "));
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DERReader der2 = new DERReader(xBytes);
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val = der2.read();
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DerUtil.checkIsBigInteger(val, "Wrong X field");
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x = (BigInteger) val.getValue();
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}
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catch (IOException e)
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{
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InvalidParameterException y = new InvalidParameterException(e.getMessage());
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y.initCause(e);
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throw y;
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}
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if (Configuration.DEBUG)
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log.exiting(this.getClass().getName(), "decodePrivateKey");
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return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x);
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}
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}
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