mirror of git://gcc.gnu.org/git/gcc.git
126 lines
4.5 KiB
Java
126 lines
4.5 KiB
Java
/* DSSParametersGenerator.java -- JCE Adapter for a generator of DSS parameters
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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.jce.sig;
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import gnu.java.security.Registry;
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import gnu.java.security.key.dss.DSSKeyPairGenerator;
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import gnu.java.security.key.dss.FIPS186;
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import gnu.java.security.provider.Gnu;
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import java.math.BigInteger;
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import java.security.AlgorithmParameterGeneratorSpi;
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import java.security.AlgorithmParameters;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidParameterException;
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import java.security.NoSuchAlgorithmException;
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import java.security.Provider;
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import java.security.SecureRandom;
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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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/**
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* A JCE Adapter for a generator of DSS parameters.
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*/
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public class DSSParametersGenerator
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extends AlgorithmParameterGeneratorSpi
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{
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private static final Provider GNU = new Gnu();
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/** Size of the public modulus in bits. */
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private int modulusLength = -1;
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/** User specified source of randomness. */
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private SecureRandom rnd;
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/** Our concrete DSS parameters generator. */
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private FIPS186 fips;
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// default 0-arguments constructor
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protected void engineInit(int size, SecureRandom random)
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{
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if ((size % 64) != 0 || size < 512 || size > 1024)
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throw new InvalidParameterException("Modulus size/length (in bits) MUST "
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+ "be a multiple of 64, greater than "
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+ "or equal to 512, and less than or "
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+ "equal to 1024");
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this.modulusLength = size;
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this.rnd = random;
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}
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protected void engineInit(AlgorithmParameterSpec spec, SecureRandom random)
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throws InvalidAlgorithmParameterException
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{
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if (! (spec instanceof DSAParameterSpec))
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throw new InvalidAlgorithmParameterException("Wrong AlgorithmParameterSpec type: "
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+ spec.getClass().getName());
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DSAParameterSpec dsaSpec = (DSAParameterSpec) spec;
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BigInteger p = dsaSpec.getP();
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int size = p.bitLength();
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this.engineInit(size, random);
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}
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protected AlgorithmParameters engineGenerateParameters()
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{
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if (modulusLength < 1)
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modulusLength = DSSKeyPairGenerator.DEFAULT_MODULUS_LENGTH;
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fips = new FIPS186(modulusLength, rnd);
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BigInteger[] params = fips.generateParameters();
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BigInteger p = params[3];
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BigInteger q = params[2];
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BigInteger g = params[5];
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DSAParameterSpec spec = new DSAParameterSpec(p, q, g);
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AlgorithmParameters result = null;
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try
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{
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result = AlgorithmParameters.getInstance(Registry.DSS_KPG, GNU);
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result.init(spec);
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}
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catch (NoSuchAlgorithmException ignore)
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{
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}
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catch (InvalidParameterSpecException ignore)
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{
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}
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return result;
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}
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}
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