| /* DSSKeyPairPKCS8Codec.java -- PKCS#8 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.Configuration; |
| import gnu.java.security.OID; |
| import gnu.java.security.Registry; |
| 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 gnu.java.security.util.Util; |
| |
| 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; |
| import java.util.logging.Logger; |
| |
| /** |
| * An implementation of an {@link IKeyPairCodec} that knows how to encode / |
| * decode PKCS#8 ASN.1 external representation of DSS private keys. |
| * |
| * @author Casey Marshall (rsdio@metastatic.org) |
| */ |
| public class DSSKeyPairPKCS8Codec |
| implements IKeyPairCodec |
| { |
| private static final Logger log = Logger.getLogger(DSSKeyPairPKCS8Codec.class.getName()); |
| private static final OID DSA_ALG_OID = new OID(Registry.DSA_OID_STRING); |
| |
| // implicit 0-arguments constructor |
| |
| public int getFormatID() |
| { |
| return PKCS8_FORMAT; |
| } |
| |
| /** |
| * @throws InvalidParameterException ALWAYS. |
| */ |
| public byte[] encodePublicKey(PublicKey key) |
| { |
| throw new InvalidParameterException("Wrong format for public keys"); |
| } |
| |
| /** |
| * Returns the PKCS#8 ASN.1 <i>PrivateKeyInfo</i> representation of a DSA |
| * private key. The ASN.1 specification is as follows: |
| * |
| * <pre> |
| * PrivateKeyInfo ::= SEQUENCE { |
| * version INTEGER, -- MUST be 0 |
| * privateKeyAlgorithm AlgorithmIdentifier, |
| * privateKey OCTET STRING |
| * } |
| * |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL |
| * } |
| * |
| * DssParams ::= SEQUENCE { |
| * p INTEGER, |
| * q INTEGER, |
| * g INTEGER |
| * } |
| * </pre> |
| * |
| * @return the DER encoded form of the ASN.1 representation of the |
| * <i>PrivateKeyInfo</i> field in an X.509 certificate. |
| * @throw InvalidParameterException if an error occurs during the marshalling |
| * process. |
| */ |
| public byte[] encodePrivateKey(PrivateKey key) |
| { |
| if (! (key instanceof DSSPrivateKey)) |
| throw new InvalidParameterException("Wrong key type"); |
| |
| DERValue derVersion = new DERValue(DER.INTEGER, BigInteger.ZERO); |
| |
| DERValue derOID = new DERValue(DER.OBJECT_IDENTIFIER, DSA_ALG_OID); |
| |
| DSSPrivateKey pk = (DSSPrivateKey) key; |
| BigInteger p = pk.getParams().getP(); |
| BigInteger q = pk.getParams().getQ(); |
| BigInteger g = pk.getParams().getG(); |
| BigInteger x = pk.getX(); |
| |
| ArrayList params = new ArrayList(3); |
| params.add(new DERValue(DER.INTEGER, p)); |
| params.add(new DERValue(DER.INTEGER, q)); |
| params.add(new DERValue(DER.INTEGER, g)); |
| DERValue 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); |
| |
| // The OCTET STRING is the DER encoding of an INTEGER. |
| DERValue derX = new DERValue(DER.INTEGER, x); |
| DERValue derPrivateKey = new DERValue(DER.OCTET_STRING, derX.getEncoded()); |
| |
| ArrayList pki = new ArrayList(3); |
| pki.add(derVersion); |
| pki.add(derAlgorithmID); |
| pki.add(derPrivateKey); |
| DERValue derPKI = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, pki); |
| |
| byte[] result; |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| try |
| { |
| DERWriter.write(baos, derPKI); |
| result = baos.toByteArray(); |
| } |
| catch (IOException e) |
| { |
| InvalidParameterException y = new InvalidParameterException(e.getMessage()); |
| y.initCause(e); |
| throw y; |
| } |
| return result; |
| } |
| |
| /** |
| * @throws InvalidParameterException ALWAYS. |
| */ |
| public PublicKey decodePublicKey(byte[] input) |
| { |
| throw new InvalidParameterException("Wrong format for public keys"); |
| } |
| |
| /** |
| * @param input the byte array to unmarshall into a valid DSS |
| * {@link PrivateKey} instance. MUST NOT be null. |
| * @return a new instance of a {@link DSSPrivateKey} decoded from the |
| * <i>PrivateKeyInfo</i> material fed as <code>input</code>. |
| * @throw InvalidParameterException if an exception occurs during the |
| * unmarshalling process. |
| */ |
| public PrivateKey decodePrivateKey(byte[] input) |
| { |
| if (Configuration.DEBUG) |
| log.entering(this.getClass().getName(), "decodePrivateKey"); |
| if (input == null) |
| throw new InvalidParameterException("Input bytes MUST NOT be null"); |
| |
| BigInteger version, p, q, g, x; |
| DERReader der = new DERReader(input); |
| try |
| { |
| DERValue derPKI = der.read(); |
| DerUtil.checkIsConstructed(derPKI, "Wrong PrivateKeyInfo field"); |
| |
| DERValue derVersion = der.read(); |
| if (! (derVersion.getValue() instanceof BigInteger)) |
| throw new InvalidParameterException("Wrong Version field"); |
| |
| version = (BigInteger) derVersion.getValue(); |
| if (version.compareTo(BigInteger.ZERO) != 0) |
| throw new InvalidParameterException("Unexpected Version: " + version); |
| |
| DERValue derAlgoritmID = der.read(); |
| DerUtil.checkIsConstructed(derAlgoritmID, "Wrong AlgorithmIdentifier field"); |
| |
| DERValue derOID = der.read(); |
| OID algOID = (OID) derOID.getValue(); |
| if (! algOID.equals(DSA_ALG_OID)) |
| throw new InvalidParameterException("Unexpected OID: " + algOID); |
| |
| DERValue derParams = der.read(); |
| DerUtil.checkIsConstructed(derParams, "Wrong DSS Parameters field"); |
| |
| DERValue 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 (Configuration.DEBUG) |
| log.fine("val = " + val); |
| byte[] xBytes = (byte[]) val.getValue(); |
| if (Configuration.DEBUG) |
| log.fine(Util.dumpString(xBytes, "xBytes: ")); |
| DERReader der2 = new DERReader(xBytes); |
| val = der2.read(); |
| DerUtil.checkIsBigInteger(val, "Wrong X field"); |
| x = (BigInteger) val.getValue(); |
| } |
| catch (IOException e) |
| { |
| InvalidParameterException y = new InvalidParameterException(e.getMessage()); |
| y.initCause(e); |
| throw y; |
| } |
| if (Configuration.DEBUG) |
| log.exiting(this.getClass().getName(), "decodePrivateKey"); |
| return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x); |
| } |
| } |