edu.vt.middleware.crypt.pbe.PBKDF1KeyGenerator.java Source code

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Here is the source code for edu.vt.middleware.crypt.pbe.PBKDF1KeyGenerator.java

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/*
  $Id$
    
  Copyright (C) 2003-2013 Virginia Tech.
  All rights reserved.
    
  SEE LICENSE FOR MORE INFORMATION
    
  Author:  Middleware Services
  Email:   middleware@vt.edu
  Version: $Revision$
  Updated: $Date$
*/
package edu.vt.middleware.crypt.pbe;

import edu.vt.middleware.crypt.digest.DigestAlgorithm;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator;

/**
 * Implements the PBKDF1 key generation function defined in PKCS#5v2.
 *
 * @author  Middleware Services
 * @version  $Revision$
 */
public class PBKDF1KeyGenerator 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.
     */
    public PBKDF1KeyGenerator(final DigestAlgorithm prf, final byte[] saltBytes) {
        this(prf, saltBytes, DEFAULT_ITERATION_COUNT);
    }

    /**
     * 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 PBKDF1KeyGenerator(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 PKCS5S1ParametersGenerator(digest.getDigest());
    }

    /** {@inheritDoc} */
    protected byte[] toBytes(final char[] password) {
        return PBEParametersGenerator.PKCS5PasswordToBytes(password);
    }
}