package org.jboss.seam.security.crypto;

/**
 * Copied from Matthias Gartner's PKCS#5 implementation - see
 * http://rtner.de/software/PBKDF2.html
 * 
 * <p>
 * Parameter data holder for PBKDF2 configuration.
 * </p>
 * 
 * <hr />
 * <p>
 * A free Java implementation of Password Based Key Derivation Function 2 as
 * defined by RFC 2898. Copyright (c) 2007 Matthias G&auml;rtner
 * </p>
 * <p>
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * </p>
 * <p>
 * This library 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 Lesser General Public License for more
 * details.
 * </p>
 * <p>
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 * </p>
 * <p>
 * For Details, see <a
 * href="http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html"
 * >http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html</a>.
 * </p>
 * 
 * @author Matthias G&auml;rtner
 * @version 1.0
 */
public class PBKDF2Parameters
{
   protected byte[] salt;
   
   protected int iterationCount;
   
   protected String hashAlgorithm;
   
   protected String hashCharset;
   
   /**
    * The derived key is actually only a convenience to store a reference
    * derived key. It is not used during computation.
    */
   protected byte[] derivedKey;
   
   /**
    * Constructor. Defaults to <code>null</code> for byte arrays, UTF-8 as
    * character set and 1000 for iteration count.
    * 
    */
   public PBKDF2Parameters()
   {
      this.hashAlgorithm = null;
      this.hashCharset = "UTF-8";
      this.salt = null;
      this.iterationCount = 1000;
      this.derivedKey = null;
   }
   
   /**
    * Constructor.
    * 
    * @param hashAlgorithm
    *           for example HMacSHA1 or HMacMD5
    * @param hashCharset
    *           for example UTF-8
    * @param salt
    *           Salt as byte array, may be <code>null</code> (not recommended)
    * @param iterationCount
    *           Number of iterations to execute. Recommended value 1000.
    */
   public PBKDF2Parameters(String hashAlgorithm, String hashCharset, byte[] salt, int iterationCount)
   {
      this.hashAlgorithm = hashAlgorithm;
      this.hashCharset = hashCharset;
      this.salt = salt;
      this.iterationCount = iterationCount;
      this.derivedKey = null;
   }
   
   /**
    * Constructor.
    * 
    * @param hashAlgorithm
    *           for example HMacSHA1 or HMacMD5
    * @param hashCharset
    *           for example UTF-8
    * @param salt
    *           Salt as byte array, may be <code>null</code> (not recommended)
    * @param iterationCount
    *           Number of iterations to execute. Recommended value 1000.
    * @param derivedKey
    *           Convenience data holder, not used during computation.
    */
   public PBKDF2Parameters(String hashAlgorithm, String hashCharset, byte[] salt, int iterationCount, byte[] derivedKey)
   {
      this.hashAlgorithm = hashAlgorithm;
      this.hashCharset = hashCharset;
      this.salt = salt;
      this.iterationCount = iterationCount;
      this.derivedKey = derivedKey;
   }
   
   public int getIterationCount()
   {
      return iterationCount;
   }
   
   public void setIterationCount(int iterationCount)
   {
      this.iterationCount = iterationCount;
   }
   
   public byte[] getSalt()
   {
      return salt;
   }
   
   public void setSalt(byte[] salt)
   {
      this.salt = salt;
   }
   
   public byte[] getDerivedKey()
   {
      return derivedKey;
   }
   
   public void setDerivedKey(byte[] derivedKey)
   {
      this.derivedKey = derivedKey;
   }
   
   public String getHashAlgorithm()
   {
      return hashAlgorithm;
   }
   
   public void setHashAlgorithm(String hashAlgorithm)
   {
      this.hashAlgorithm = hashAlgorithm;
   }
   
   public String getHashCharset()
   {
      return hashCharset;
   }
   
   public void setHashCharset(String hashCharset)
   {
      this.hashCharset = hashCharset;
   }
}
