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jeremybenn |
/* RSAKeyPairX509Codec.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.rsa;
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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.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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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 X.509 ASN.1 external representation of RSA public keys.
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*/
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public class RSAKeyPairX509Codec
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implements IKeyPairCodec
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{
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private static final Logger log = Logger.getLogger(RSAKeyPairX509Codec.class.getName());
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private static final OID RSA_ALG_OID = new OID(Registry.RSA_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 an
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* RSA 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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* </pre>
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* <p>
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* As indicated in RFC-2459: "The parameters field shall have ASN.1 type NULL
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* for this algorithm identifier.".
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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 RSA public key defined as:
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*
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* <pre>
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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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 GnuRSAPublicKey}.
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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 GnuRSAPublicKey} 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 (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "encodePublicKey()", key);
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if (! (key instanceof GnuRSAPublicKey))
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throw new InvalidParameterException("key");
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DERValue derOID = new DERValue(DER.OBJECT_IDENTIFIER, RSA_ALG_OID);
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GnuRSAPublicKey rsaKey = (GnuRSAPublicKey) key;
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BigInteger n = rsaKey.getN();
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BigInteger e = rsaKey.getE();
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DERValue derN = new DERValue(DER.INTEGER, n);
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DERValue derE = new DERValue(DER.INTEGER, e);
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ArrayList algorithmID = new ArrayList(2);
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algorithmID.add(derOID);
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algorithmID.add(new DERValue(DER.NULL, null));
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DERValue derAlgorithmID = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE,
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algorithmID);
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ArrayList publicKey = new ArrayList(2);
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publicKey.add(derN);
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publicKey.add(derE);
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DERValue derPublicKey = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE,
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publicKey);
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byte[] spkBytes = derPublicKey.getEncoded();
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DERValue derSPK = new DERValue(DER.BIT_STRING, new BitString(spkBytes));
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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 y = new InvalidParameterException(x.getMessage());
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y.initCause(x);
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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(), "encodePublicKey()", result);
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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 RSA
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* {@link PublicKey} instance. MUST NOT be null.
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* @return a new instance of a {@link GnuRSAPublicKey} 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 (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "decodePublicKey()", input);
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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 n, e;
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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(RSA_ALG_OID))
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throw new InvalidParameterException("Unexpected OID: " + algOID);
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// rfc-2459 states that this field is OPTIONAL but NULL if/when present
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DERValue val = der.read();
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if (val.getTag() == DER.NULL)
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val = der.read();
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if (! (val.getValue() instanceof BitString))
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throw new InvalidParameterException("Wrong SubjectPublicKey field");
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byte[] spkBytes = ((BitString) val.getValue()).toByteArray();
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der = new DERReader(spkBytes);
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val = der.read();
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DerUtil.checkIsConstructed(derAlgorithmID, "Wrong subjectPublicKey field");
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val = der.read();
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DerUtil.checkIsBigInteger(val, "Wrong modulus field");
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n = (BigInteger) val.getValue();
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val = der.read();
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DerUtil.checkIsBigInteger(val, "Wrong publicExponent field");
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e = (BigInteger) val.getValue();
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}
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catch (IOException x)
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{
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InvalidParameterException y = new InvalidParameterException(x.getMessage());
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y.initCause(x);
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throw y;
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}
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PublicKey result = new GnuRSAPublicKey(Registry.X509_ENCODING_ID, n, e);
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if (Configuration.DEBUG)
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log.exiting(this.getClass().getName(), "decodePublicKey()", result);
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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 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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