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Library for performing common cryptographic operations

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/*
  $Id: PKCS12KeyGenerator.java 1818 2011-02-08 19:19:09Z dfisher $

  Copyright (C) 2007-2011 Virginia Tech.
  All rights reserved.

  SEE LICENSE FOR MORE INFORMATION

  Author:  Middleware Services
  Email:   [email protected]
  Version: $Revision: 1818 $
  Updated: $Date: 2011-02-08 14:19:09 -0500 (Tue, 08 Feb 2011) $
*/
package edu.vt.middleware.crypt.pbe;

import edu.vt.middleware.crypt.digest.DigestAlgorithm;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;

/**
 * Implements the password-based key generation function defined in section B of
 * PKCS#12.
 *
 * @author  Middleware Services
 * @version  $Revision: 1818 $
 */
public class PKCS12KeyGenerator extends AbstractPKCSKeyGenerator
{

  /** Digest algorithm. */
  private DigestAlgorithm digest;


  /**
   * Creates a new instance that uses the given digest for the pseudorandom
   * function.
   *
   * @param  prf  Pseudorandom function digest.
   * @param  saltBytes  Key derivation function salt bytes.
   * @param  iterations  Key derivation function iteration count.
   */
  public PKCS12KeyGenerator(
    final DigestAlgorithm prf,
    final byte[] saltBytes,
    final int iterations)
  {
    if (prf == null) {
      throw new IllegalArgumentException("Digest cannot be null.");
    }
    this.digest = prf;
    this.salt = saltBytes;
    setIterationCount(iterations);
  }


  /** {@inheritDoc} */
  protected PBEParametersGenerator newParamGenerator()
  {
    return new PKCS12ParametersGenerator(digest.getDigest());
  }


  /** {@inheritDoc} */
  protected byte[] toBytes(final char[] password)
  {
    return PBEParametersGenerator.PKCS12PasswordToBytes(password);
  }
}