org.cryptacular.pbe.PBES1EncryptionScheme.java Source code

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Here is the source code for org.cryptacular.pbe.PBES1EncryptionScheme.java

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/* See LICENSE for licensing and NOTICE for copyright. */
package org.cryptacular.pbe;

import org.bouncycastle.asn1.pkcs.PBEParameter;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator;

/**
 * Implements the PBES1 encryption scheme defined in PKCS#5v2.
 *
 * @author  Middleware Services
 * @version  $Revision: 2744 $
 */
public class PBES1EncryptionScheme extends AbstractEncryptionScheme {

    /** Number of bits in derived key. */
    public static final int KEY_LENGTH = 64;

    /** Number of bits IV. */
    public static final int IV_LENGTH = 64;

    /**
     * Creates a new instance with the given parameters.
     *
     * @param  alg  Describes hash/algorithm pair suitable for PBES1 scheme.
     * @param  params  Key generation function salt and iteration count.
     * @param  password  Password used to derive key.
     */
    public PBES1EncryptionScheme(final PBES1Algorithm alg, final PBEParameter params, final char[] password) {
        final byte[] salt = params.getSalt();
        final int iterations = params.getIterationCount().intValue();
        final PKCS5S1ParametersGenerator generator = new PKCS5S1ParametersGenerator(
                alg.getDigestSpec().newInstance());
        generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password), salt, iterations);
        setCipher(alg.getCipherSpec().newInstance());
        setCipherParameters(generator.generateDerivedParameters(KEY_LENGTH, IV_LENGTH));
    }
}