gcc/libjava/classpath/gnu/java/security/jce/sig/DSSKeyPairGeneratorSpi.java

/* DSSKeyPairGeneratorSpi.java -- 
   Copyright 2001, 2002, 2006 Free Software Foundation, Inc.

This file is a 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 of the License, 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, 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
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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
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exception statement from your version.  */


package gnu.java.security.jce.sig;

import gnu.java.security.Registry;
import gnu.java.security.key.dss.DSSKeyPairGenerator;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidParameterException;
import java.security.SecureRandom;
import java.security.interfaces.DSAKeyPairGenerator;
import java.security.interfaces.DSAParams;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.DSAParameterSpec;
import java.util.HashMap;

/**
 * The implementation of a {@link java.security.KeyPairGenerator} adapter class
 * to wrap gnu.crypto DSS keypair generator instances.<p>
 *
 * In case the client does not explicitly initialize the KeyPairGenerator (via
 * a call to an <code>initialize()</code> method), the GNU Crypto provider
 * uses a default <i>modulus</i> size (keysize) of 1024 bits.<p>
 */
public class DSSKeyPairGeneratorSpi extends KeyPairGeneratorAdapter implements
    DSAKeyPairGenerator
{

  // Constants and variables
  // -------------------------------------------------------------------------

  // Constructor(s)
  // -------------------------------------------------------------------------

  public DSSKeyPairGeneratorSpi()
  {
    super(Registry.DSS_KPG);
  }

  // Class methods
  // -------------------------------------------------------------------------

  // Instance methods
  // -------------------------------------------------------------------------

  public void initialize(int keysize, SecureRandom random)
  {
    this.initialize(keysize, false, random);
  }

  public void initialize(AlgorithmParameterSpec params, SecureRandom random)
      throws InvalidAlgorithmParameterException
  {
    HashMap attributes = new HashMap();
    if (params != null)
      {
        if (!(params instanceof DSAParameterSpec))
          throw new InvalidAlgorithmParameterException(
              "Parameters argument is not a non-null instance, or " +
              "sub-instance, of java.security.spec.DSAParameterSpec");

        attributes.put(DSSKeyPairGenerator.DSS_PARAMETERS, params);
      }

    if (random != null)
      {
        attributes.put(DSSKeyPairGenerator.SOURCE_OF_RANDOMNESS, random);
      }

    attributes.put(DSSKeyPairGenerator.PREFERRED_ENCODING_FORMAT,
                   new Integer(Registry.ASN1_ENCODING_ID));
    try
      {
        adaptee.setup(attributes);
      }
    catch (IllegalArgumentException x)
      {
        InvalidAlgorithmParameterException y =
            new InvalidAlgorithmParameterException();
        y.initCause(x);
        throw y;
      }
  }

  // java.security.interfaces.DSAKeyPairGenerator interface implementation -----

  public void initialize(DSAParams params, SecureRandom random)
      throws InvalidParameterException
  {
    if (params == null || !(params instanceof DSAParameterSpec))
      throw new InvalidParameterException(
          "Parameters argument is either null or is not an instance, or " +
          "sub-instance, of java.security.spec.DSAParameterSpec");
    DSAParameterSpec spec = (DSAParameterSpec) params;
    try
      {
        this.initialize((AlgorithmParameterSpec) spec, random);
      }
    catch (InvalidAlgorithmParameterException x)
      {
        InvalidParameterException y = new InvalidParameterException();
        y.initCause(x);
        throw y;
      }
  }

  public void initialize(int modlen, boolean genParams, SecureRandom random)
      throws InvalidParameterException
  {
    HashMap attributes = new HashMap();
    attributes.put(DSSKeyPairGenerator.MODULUS_LENGTH, new Integer(modlen));
    if (random != null)
      attributes.put(DSSKeyPairGenerator.SOURCE_OF_RANDOMNESS, random);

    attributes.put(DSSKeyPairGenerator.USE_DEFAULTS,
                   Boolean.valueOf(!genParams));
    attributes.put(DSSKeyPairGenerator.STRICT_DEFAULTS, Boolean.TRUE);
    attributes.put(DSSKeyPairGenerator.PREFERRED_ENCODING_FORMAT,
                   new Integer(Registry.ASN1_ENCODING_ID));
    try
      {
        adaptee.setup(attributes);
      }
    catch (IllegalArgumentException x)
      {
        InvalidParameterException y = new InvalidParameterException();
        y.initCause(x);
        throw y;
      }
  }
}