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-/* DSSKeyPairX509Codec.java -- X.509 Encoding/Decoding handler
- Copyright (C) 2006 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package gnu.java.security.key.dss;
-
-import gnu.java.security.OID;
-import gnu.java.security.Registry;
-import gnu.java.security.der.BitString;
-import gnu.java.security.der.DER;
-import gnu.java.security.der.DERReader;
-import gnu.java.security.der.DERValue;
-import gnu.java.security.der.DERWriter;
-import gnu.java.security.key.IKeyPairCodec;
-import gnu.java.security.util.DerUtil;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.math.BigInteger;
-import java.security.InvalidParameterException;
-import java.security.PrivateKey;
-import java.security.PublicKey;
-import java.util.ArrayList;
-
-/**
- * An implementation of an {@link IKeyPairCodec} that knows how to encode /
- * decode X.509 ASN.1 external representation of DSS public keys.
- */
-public class DSSKeyPairX509Codec
- implements IKeyPairCodec
-{
- private static final OID DSA_ALG_OID = new OID(Registry.DSA_OID_STRING);
-
- // implicit 0-arguments constructor
-
- public int getFormatID()
- {
- return X509_FORMAT;
- }
-
- /**
- * Returns the X.509 ASN.1 <i>SubjectPublicKeyInfo</i> representation of a
- * DSA public key. The ASN.1 specification, as defined in RFC-3280, and
- * RFC-2459, is as follows:
- *
- * <pre>
- * SubjectPublicKeyInfo ::= SEQUENCE {
- * algorithm AlgorithmIdentifier,
- * subjectPublicKey BIT STRING
- * }
- *
- * AlgorithmIdentifier ::= SEQUENCE {
- * algorithm OBJECT IDENTIFIER,
- * parameters ANY DEFINED BY algorithm OPTIONAL
- * }
- *
- * DssParams ::= SEQUENCE {
- * p INTEGER,
- * q INTEGER,
- * g INTEGER
- * }
- * </pre>
- * <p>
- * Note that RFC-3280 (page 79) implies that some certificates MAY have an
- * absent, or NULL, parameters field in their AlgorithmIdentifier element,
- * implying that those parameters MUST be <i>inherited</i> from another
- * certificate. This implementation, encodes a <i>NULL</i> element as the DER
- * value of the parameters field when such is the case.
- * <p>
- * The <i>subjectPublicKey</i> field, which is a BIT STRING, contains the
- * DER-encoded form of the DSA public key as an INTEGER.
- *
- * <pre>
- * DSAPublicKey ::= INTEGER -- public key, Y
- * </pre>
- *
- * @param key the {@link PublicKey} instance to encode. MUST be an instance of
- * {@link DSSPublicKey}.
- * @return the ASN.1 representation of the <i>SubjectPublicKeyInfo</i> in an
- * X.509 certificate.
- * @throw InvalidParameterException if <code>key</code> is not an instance
- * of {@link DSSPublicKey} or if an exception occurs during the
- * marshalling process.
- */
- public byte[] encodePublicKey(PublicKey key)
- {
- if (! (key instanceof DSSPublicKey))
- throw new InvalidParameterException("key");
-
- DERValue derOID = new DERValue(DER.OBJECT_IDENTIFIER, DSA_ALG_OID);
-
- DSSPublicKey dssKey = (DSSPublicKey) key;
- DERValue derParams;
- if (dssKey.hasInheritedParameters())
- derParams = new DERValue(DER.NULL, null);
- else
- {
- BigInteger p = dssKey.getParams().getP();
- BigInteger q = dssKey.getParams().getQ();
- BigInteger g = dssKey.getParams().getG();
-
- DERValue derP = new DERValue(DER.INTEGER, p);
- DERValue derQ = new DERValue(DER.INTEGER, q);
- DERValue derG = new DERValue(DER.INTEGER, g);
-
- ArrayList params = new ArrayList(3);
- params.add(derP);
- params.add(derQ);
- params.add(derG);
- derParams = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, params);
- }
-
- ArrayList algorithmID = new ArrayList(2);
- algorithmID.add(derOID);
- algorithmID.add(derParams);
- DERValue derAlgorithmID = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE,
- algorithmID);
-
- BigInteger y = dssKey.getY();
- DERValue derDSAPublicKey = new DERValue(DER.INTEGER, y);
- byte[] yBytes = derDSAPublicKey.getEncoded();
- DERValue derSPK = new DERValue(DER.BIT_STRING, new BitString(yBytes));
-
- ArrayList spki = new ArrayList(2);
- spki.add(derAlgorithmID);
- spki.add(derSPK);
- DERValue derSPKI = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, spki);
-
- byte[] result;
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- try
- {
- DERWriter.write(baos, derSPKI);
- result = baos.toByteArray();
- }
- catch (IOException x)
- {
- InvalidParameterException e = new InvalidParameterException(x.getMessage());
- e.initCause(x);
- throw e;
- }
- return result;
- }
-
- /**
- * @throws InvalidParameterException ALWAYS.
- */
- public byte[] encodePrivateKey(PrivateKey key)
- {
- throw new InvalidParameterException("Wrong format for private keys");
- }
-
- /**
- * @param input the byte array to unmarshall into a valid DSS
- * {@link PublicKey} instance. MUST NOT be null.
- * @return a new instance of a {@link DSSPublicKey} decoded from the
- * <i>SubjectPublicKeyInfo</i> material in an X.509 certificate.
- * @throw InvalidParameterException if an exception occurs during the
- * unmarshalling process.
- */
- public PublicKey decodePublicKey(byte[] input)
- {
- if (input == null)
- throw new InvalidParameterException("Input bytes MUST NOT be null");
-
- BigInteger p = null;
- BigInteger g = null;
- BigInteger q = null;
- BigInteger y;
- DERReader der = new DERReader(input);
- try
- {
- DERValue derSPKI = der.read();
- DerUtil.checkIsConstructed(derSPKI, "Wrong SubjectPublicKeyInfo field");
-
- DERValue derAlgorithmID = der.read();
- DerUtil.checkIsConstructed(derAlgorithmID, "Wrong AlgorithmIdentifier field");
-
- DERValue derOID = der.read();
- if (! (derOID.getValue() instanceof OID))
- throw new InvalidParameterException("Wrong Algorithm field");
-
- OID algOID = (OID) derOID.getValue();
- if (! algOID.equals(DSA_ALG_OID))
- throw new InvalidParameterException("Unexpected OID: " + algOID);
-
- DERValue val = der.read();
- // RFC-3280, page 79 states: "If the subjectPublicKeyInfo field of the
- // certificate contains an algorithm field with null parameters or
- // parameters are omitted, compare the certificate subjectPublicKey
- // algorithm to the working_public_key_algorithm. If the certificate
- // subjectPublicKey algorithm and the working_public_key_algorithm are
- // different, set the working_public_key_parameters to null."
- // in other words, the parameters field of an AlgorithmIdentifier
- // element MAY NOT be present at all, or if present MAY be NULL!
- // the Mauve test ValidDSAParameterInheritenceTest5, in
- // gnu.testlet.java.security.cert.pkix.pkits, is/was failing because
- // of this.
- if (val.getTag() == DER.NULL)
- val = der.read();
- else if (val.isConstructed())
- {
- val = der.read();
- DerUtil.checkIsBigInteger(val, "Wrong P field");
- p = (BigInteger) val.getValue();
- val = der.read();
- DerUtil.checkIsBigInteger(val, "Wrong Q field");
- q = (BigInteger) val.getValue();
- val = der.read();
- DerUtil.checkIsBigInteger(val, "Wrong G field");
- g = (BigInteger) val.getValue();
-
- val = der.read();
- }
-
- if (! (val.getValue() instanceof BitString))
- throw new InvalidParameterException("Wrong SubjectPublicKey field");
-
- byte[] yBytes = ((BitString) val.getValue()).toByteArray();
-
- DERReader dsaPub = new DERReader(yBytes);
- val = dsaPub.read();
- DerUtil.checkIsBigInteger(val, "Wrong Y field");
- y = (BigInteger) val.getValue();
- }
- catch (IOException x)
- {
- InvalidParameterException e = new InvalidParameterException(x.getMessage());
- e.initCause(x);
- throw e;
- }
- return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
- }
-
- /**
- * @throws InvalidParameterException ALWAYS.
- */
- public PrivateKey decodePrivateKey(byte[] input)
- {
- throw new InvalidParameterException("Wrong format for private keys");
- }
-}
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