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/* PBKDF2SecretKeyFactory.java --

   Copyright (C) 2003, 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

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.javax.crypto.jce;

import java.security.spec.InvalidKeySpecException;

import java.security.spec.KeySpec;

import java.util.HashMap;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactorySpi;

import javax.crypto.spec.PBEKeySpec;

import javax.crypto.spec.SecretKeySpec;

import gnu.javax.crypto.prng.IPBE;

import gnu.java.security.prng.IRandom;

import gnu.java.security.prng.LimitReachedException;

import gnu.javax.crypto.prng.PRNGFactory;

public abstract class PBKDF2SecretKeyFactory

    extends SecretKeyFactorySpi

{

  protected String macName;

  private static final int DEFAULT_ITERATION_COUNT = 1000;

  private static final int DEFAULT_KEY_LEN = 32;

  protected PBKDF2SecretKeyFactory(String macName)

  {

    this.macName = macName;

  }

  protected SecretKey engineGenerateSecret(KeySpec spec)

      throws InvalidKeySpecException

  {

    if (! (spec instanceof PBEKeySpec))

      throw new InvalidKeySpecException("not a PBEKeySpec");

    IRandom kdf = PRNGFactory.getInstance("PBKDF2-" + macName);

    HashMap attr = new HashMap();

    attr.put(IPBE.PASSWORD, ((PBEKeySpec) spec).getPassword());

    byte[] salt = ((PBEKeySpec) spec).getSalt();

    if (salt == null)

      salt = new byte[0];

    attr.put(IPBE.SALT, salt);

    int ic = ((PBEKeySpec) spec).getIterationCount();

    if (ic <= 0)

      ic = DEFAULT_ITERATION_COUNT;

    attr.put(IPBE.ITERATION_COUNT, Integer.valueOf(ic));

    kdf.init(attr);

    int len = ((PBEKeySpec) spec).getKeyLength();

    if (len <= 0)

      len = DEFAULT_KEY_LEN;

    byte[] dk = new byte[len];

    try

      {

        kdf.nextBytes(dk, 0, len);

      }

    catch (LimitReachedException lre)

      {

        throw new IllegalArgumentException(lre.toString());

      }

    return new SecretKeySpec(dk, "PBKDF2");

  }

  protected KeySpec engineGetKeySpec(SecretKey key, Class clazz)

      throws InvalidKeySpecException

  {

    throw new InvalidKeySpecException("not supported");

  }

  protected SecretKey engineTranslateKey(SecretKey key)

  {

    return new SecretKeySpec(key.getEncoded(), key.getAlgorithm());

  }

  public static class HMacHaval

      extends PBKDF2SecretKeyFactory

  {

    public HMacHaval()

    {

      super("HMAC-HAVAL");

    }

  }

  public static class HMacMD2

      extends PBKDF2SecretKeyFactory

  {

    public HMacMD2()

    {

      super("HMAC-MD2");

    }

  }

  public static class HMacMD4

      extends PBKDF2SecretKeyFactory

  {

    public HMacMD4()

    {

      super("HMAC-MD4");

    }

  }

  public static class HMacMD5

      extends PBKDF2SecretKeyFactory

  {

    public HMacMD5()

    {

      super("HMAC-MD5");

    }

  }

  public static class HMacRipeMD128

      extends PBKDF2SecretKeyFactory

  {

    public HMacRipeMD128()

    {

      super("HMAC-RIPEMD128");

    }

  }

  public static class HMacRipeMD160

      extends PBKDF2SecretKeyFactory

  {

    public HMacRipeMD160()

    {

      super("HMAC-RIPEMD160");

    }

  }

  public static class HMacSHA1

      extends PBKDF2SecretKeyFactory

  {

    public HMacSHA1()

    {

      super("HMAC-SHA1");

    }

  }

  public static class HMacSHA256

      extends PBKDF2SecretKeyFactory

  {

    public HMacSHA256()

    {

      super("HMAC-SHA256");

    }

  }

  public static class HMacSHA384

      extends PBKDF2SecretKeyFactory

  {

    public HMacSHA384()

    {

      super("HMAC-SHA384");

    }

  }

  public static class HMacSHA512

      extends PBKDF2SecretKeyFactory

  {

    public HMacSHA512()

    {

      super("HMAC-SHA512");

    }

  }

  public static class HMacTiger

      extends PBKDF2SecretKeyFactory

  {

    public HMacTiger()

    {

      super("HMAC-TIGER");

    }

  }

  public static class HMacWhirlpool

      extends PBKDF2SecretKeyFactory

  {

    public HMacWhirlpool()

    {

      super("HMAC-WHIRLPOOL");

    }

  }

}