mirror of git://gcc.gnu.org/git/gcc.git
277 lines
9.7 KiB
Java
277 lines
9.7 KiB
Java
/* DSSKeyPairX509Codec.java -- X.509 Encoding/Decoding handler
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Copyright (C) 2006 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.OID;
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import gnu.java.security.Registry;
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import gnu.java.security.der.BitString;
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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 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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/**
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* An implementation of an {@link IKeyPairCodec} that knows how to encode /
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* decode X.509 ASN.1 external representation of DSS public keys.
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*/
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public class DSSKeyPairX509Codec
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implements IKeyPairCodec
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{
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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 X509_FORMAT;
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}
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/**
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* Returns the X.509 ASN.1 <i>SubjectPublicKeyInfo</i> representation of a
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* DSA public key. The ASN.1 specification, as defined in RFC-3280, and
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* RFC-2459, is as follows:
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*
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* <pre>
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT 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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* <p>
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* Note that RFC-3280 (page 79) implies that some certificates MAY have an
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* absent, or NULL, parameters field in their AlgorithmIdentifier element,
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* implying that those parameters MUST be <i>inherited</i> from another
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* certificate. This implementation, encodes a <i>NULL</i> element as the DER
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* value of the parameters field when such is the case.
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* <p>
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* The <i>subjectPublicKey</i> field, which is a BIT STRING, contains the
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* DER-encoded form of the DSA public key as an INTEGER.
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*
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* <pre>
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* DSAPublicKey ::= INTEGER -- public key, Y
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* </pre>
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*
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* @param key the {@link PublicKey} instance to encode. MUST be an instance of
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* {@link DSSPublicKey}.
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* @return the ASN.1 representation of the <i>SubjectPublicKeyInfo</i> in an
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* X.509 certificate.
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* @throw InvalidParameterException if <code>key</code> is not an instance
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* of {@link DSSPublicKey} or if an exception occurs during the
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* marshalling process.
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*/
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public byte[] encodePublicKey(PublicKey key)
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{
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if (! (key instanceof DSSPublicKey))
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throw new InvalidParameterException("key");
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DERValue derOID = new DERValue(DER.OBJECT_IDENTIFIER, DSA_ALG_OID);
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DSSPublicKey dssKey = (DSSPublicKey) key;
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DERValue derParams;
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if (dssKey.hasInheritedParameters())
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derParams = new DERValue(DER.NULL, null);
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else
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{
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BigInteger p = dssKey.getParams().getP();
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BigInteger q = dssKey.getParams().getQ();
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BigInteger g = dssKey.getParams().getG();
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DERValue derP = new DERValue(DER.INTEGER, p);
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DERValue derQ = new DERValue(DER.INTEGER, q);
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DERValue derG = new DERValue(DER.INTEGER, g);
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ArrayList params = new ArrayList(3);
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params.add(derP);
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params.add(derQ);
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params.add(derG);
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derParams = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, params);
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}
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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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BigInteger y = dssKey.getY();
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DERValue derDSAPublicKey = new DERValue(DER.INTEGER, y);
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byte[] yBytes = derDSAPublicKey.getEncoded();
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DERValue derSPK = new DERValue(DER.BIT_STRING, new BitString(yBytes));
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ArrayList spki = new ArrayList(2);
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spki.add(derAlgorithmID);
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spki.add(derSPK);
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DERValue derSPKI = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, spki);
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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, derSPKI);
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result = baos.toByteArray();
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}
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catch (IOException x)
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{
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InvalidParameterException e = new InvalidParameterException(x.getMessage());
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e.initCause(x);
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throw e;
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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 byte[] encodePrivateKey(PrivateKey key)
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{
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throw new InvalidParameterException("Wrong format for private 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 PublicKey} instance. MUST NOT be null.
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* @return a new instance of a {@link DSSPublicKey} decoded from the
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* <i>SubjectPublicKeyInfo</i> material in an X.509 certificate.
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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 PublicKey decodePublicKey(byte[] input)
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{
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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 p = null;
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BigInteger g = null;
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BigInteger q = null;
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BigInteger y;
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DERReader der = new DERReader(input);
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try
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{
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DERValue derSPKI = der.read();
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DerUtil.checkIsConstructed(derSPKI, "Wrong SubjectPublicKeyInfo field");
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DERValue derAlgorithmID = der.read();
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DerUtil.checkIsConstructed(derAlgorithmID, "Wrong AlgorithmIdentifier field");
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DERValue derOID = der.read();
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if (! (derOID.getValue() instanceof OID))
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throw new InvalidParameterException("Wrong Algorithm field");
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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 val = der.read();
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// RFC-3280, page 79 states: "If the subjectPublicKeyInfo field of the
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// certificate contains an algorithm field with null parameters or
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// parameters are omitted, compare the certificate subjectPublicKey
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// algorithm to the working_public_key_algorithm. If the certificate
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// subjectPublicKey algorithm and the working_public_key_algorithm are
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// different, set the working_public_key_parameters to null."
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// in other words, the parameters field of an AlgorithmIdentifier
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// element MAY NOT be present at all, or if present MAY be NULL!
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// the Mauve test ValidDSAParameterInheritenceTest5, in
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// gnu.testlet.java.security.cert.pkix.pkits, is/was failing because
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// of this.
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if (val.getTag() == DER.NULL)
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val = der.read();
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else if (val.isConstructed())
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{
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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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}
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if (! (val.getValue() instanceof BitString))
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throw new InvalidParameterException("Wrong SubjectPublicKey field");
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byte[] yBytes = ((BitString) val.getValue()).toByteArray();
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DERReader dsaPub = new DERReader(yBytes);
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val = dsaPub.read();
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DerUtil.checkIsBigInteger(val, "Wrong Y field");
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y = (BigInteger) val.getValue();
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}
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catch (IOException x)
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{
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InvalidParameterException e = new InvalidParameterException(x.getMessage());
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e.initCause(x);
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throw e;
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}
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return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
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}
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/**
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* @throws InvalidParameterException ALWAYS.
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*/
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public PrivateKey decodePrivateKey(byte[] input)
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{
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throw new InvalidParameterException("Wrong format for private keys");
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}
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}
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