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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cms;

import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;

import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.params.KeyParameter;

/**
 * PKCS5 scheme-2 - password converted to bytes assuming ASCII.
 */
public class PKCS5Scheme2PBEKey
    extends CMSPBEKey
{
    public PKCS5Scheme2PBEKey(char[] password, byte[] salt, int iterationCount)
    {
        super(password, salt, iterationCount);
    }

    public PKCS5Scheme2PBEKey(char[] password, AlgorithmParameters pbeParams)
        throws InvalidAlgorithmParameterException
    {
        super(password, getParamSpec(pbeParams));
    }

    byte[] getEncoded(String algorithmOid)
    {
        PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator();

        gen.init(PBEParametersGenerator.PKCS5PasswordToBytes(this.getPassword()), this.getSalt(), this.getIterationCount());

        return ((KeyParameter)gen.generateDerivedParameters(CMSEnvelopedHelper.INSTANCE.getKeySize(algorithmOid))).getKey();
    }
}