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jlechner |
/* DSAParameters.java --- DSA Parameters Implementation
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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.io.ASN1ParsingException;
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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 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.AlgorithmParametersSpi;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.DSAParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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import java.util.ArrayList;
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/*
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ASN.1 Encoding for DSA from rfc2459
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id-dsa ID ::= { iso(1) member-body(2) us(840) x9-57(10040)
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x9cm(4) 1 }
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Dss-Parms ::= 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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public class DSAParameters extends AlgorithmParametersSpi
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{
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private BigInteger q; // the small prime
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private BigInteger p; // the big prime
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private BigInteger g;
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public void engineInit(AlgorithmParameterSpec paramSpec)
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throws InvalidParameterSpecException
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{
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if( paramSpec instanceof DSAParameterSpec ) {
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DSAParameterSpec dsaParamSpec = (DSAParameterSpec)paramSpec;
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p = dsaParamSpec.getP();
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q = dsaParamSpec.getQ();
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g = dsaParamSpec.getG();
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}
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else
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throw new InvalidParameterSpecException("Only accepts DSAParameterSpec");
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}
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public void engineInit(byte[] params)
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throws IOException
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{
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DERReader in = new DERReader(params);
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DERValue val = in.read();
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if (val.getValue() != DER.CONSTRUCTED_VALUE)
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throw new ASN1ParsingException("badly formed parameters");
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try
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{
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p = (BigInteger) in.read().getValue();
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q = (BigInteger) in.read().getValue();
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g = (BigInteger) in.read().getValue();
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}
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catch (Exception x)
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{
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throw new ASN1ParsingException("badly formed parameters");
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}
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}
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public void engineInit(byte[] params, String format)
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throws IOException
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{
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if( !format.equals("ASN.1") )
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throw new IOException("Invalid Format: Only accepts ASN.1");
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engineInit( params );
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}
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public AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec)
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throws InvalidParameterSpecException
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{
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if( paramSpec.isAssignableFrom(DSAParameterSpec.class) )
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return new DSAParameterSpec(p, q, g);
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else
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throw new InvalidParameterSpecException("Only accepts DSAParameterSpec");
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}
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public byte[] engineGetEncoded()
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throws IOException
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{
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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ArrayList seq = new ArrayList(3);
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seq.add(new DERValue(DER.INTEGER, p));
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seq.add(new DERValue(DER.INTEGER, q));
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seq.add(new DERValue(DER.INTEGER, g));
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DERWriter.write(bout, new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, seq));
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return bout.toByteArray();
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}
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public byte[] engineGetEncoded(String format)
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throws IOException
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{
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if( !format.equals("ASN.1") )
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throw new IOException("Invalid Format: Only accepts ASN.1");
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return engineGetEncoded();
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}
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public String engineToString()
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{
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return ("q: " + q + " p: " + p + " g: " + g);
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}
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}
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