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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 1.5 to JDK 1.8. 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.pkcs.bc;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.bc.BcDigestProvider;
import org.bouncycastle.pkcs.PKCS12MacCalculatorBuilder;
import org.bouncycastle.pkcs.PKCS12MacCalculatorBuilderProvider;

public class BcPKCS12MacCalculatorBuilderProvider
    implements PKCS12MacCalculatorBuilderProvider
{
    private BcDigestProvider digestProvider;

    public BcPKCS12MacCalculatorBuilderProvider(BcDigestProvider digestProvider)
    {
        this.digestProvider = digestProvider;
    }

    public PKCS12MacCalculatorBuilder get(final AlgorithmIdentifier algorithmIdentifier)
    {
        return new PKCS12MacCalculatorBuilder()
        {
            public MacCalculator build(final char[] password)
                throws OperatorCreationException
            {
                PKCS12PBEParams pbeParams = PKCS12PBEParams.getInstance(algorithmIdentifier.getParameters());

                return PKCS12PBEUtils.createMacCalculator(algorithmIdentifier.getAlgorithm(), digestProvider.get(algorithmIdentifier), pbeParams, password);
            }

            public AlgorithmIdentifier getDigestAlgorithmIdentifier()
            {
                return new AlgorithmIdentifier(algorithmIdentifier.getAlgorithm(), DERNull.INSTANCE);
            }
        };
    }
}