PBKDF2SecretKeyFactory.java

/* 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
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WITHOUT ANY WARRANTY; without even the implied warranty of
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General Public License for more details.

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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
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permission to link this library with independent modules to produce an
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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");
    }
  }
}