137 lines
4.3 KiB
Java
137 lines
4.3 KiB
Java
/* GnuDSAPublicKey.java --- Gnu DSA Public Key
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Copyright (C) 1999,2003,2004 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.provider;
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import gnu.java.security.OID;
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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.DERValue;
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import gnu.java.security.der.DERWriter;
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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.interfaces.DSAParams;
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import java.security.interfaces.DSAPublicKey;
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import java.security.spec.DSAParameterSpec;
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import java.util.ArrayList;
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public class GnuDSAPublicKey implements DSAPublicKey
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{
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private byte[] encodedKey;
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BigInteger y;
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BigInteger p;
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BigInteger q;
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BigInteger g;
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public GnuDSAPublicKey(BigInteger y, BigInteger p, BigInteger q, BigInteger g )
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{
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this.y = y;
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this.p = p;
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this.q = q;
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this.g = g;
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}
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public String getAlgorithm()
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{
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return "DSA";
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}
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public String getFormat()
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{
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return "X.509";
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}
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/**
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* The encoded form of DSA public keys is:
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*
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* <blockquote><pre>
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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* </pre></blockquote>
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*/
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public byte[] getEncoded()
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{
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if (encodedKey != null)
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return (byte[]) encodedKey.clone();
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try
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{
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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ArrayList spki = new ArrayList(2);
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ArrayList alg = new ArrayList(2);
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alg.add(new DERValue(DER.OBJECT_IDENTIFIER,
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new OID("1.2.840.113549.1.1.1")));
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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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alg.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, params));
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spki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
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spki.add(new DERValue(DER.BIT_STRING, new BitString(y.toByteArray())));
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DERWriter.write(out, new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, spki));
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return (byte[]) (encodedKey = out.toByteArray()).clone();
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}
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catch (IOException ioe)
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{
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return null;
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}
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}
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public DSAParams getParams()
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{
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if (p == null || q == null || g == null)
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return null;
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return (DSAParams)(new DSAParameterSpec(p,q,g));
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}
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public BigInteger getY()
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{
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return y;
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}
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public String toString()
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{
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return
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"GnuDSAPublicKey: y=" + (y != null ? y.toString(16) : "(null)") +
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" p=" + (p != null ? p.toString(16) : "(null)") +
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" q=" + (q != null ? q.toString(16) : "(null)") +
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" g=" + (g != null ? g.toString(16) : "(null)");
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}
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}
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