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