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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.operator.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.Provider;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;

public class JcaDigestCalculatorProviderBuilder
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());

    public JcaDigestCalculatorProviderBuilder()
    {
    }

    public JcaDigestCalculatorProviderBuilder setProvider(Provider provider)
    {
        this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));

        return this;
    }

    public JcaDigestCalculatorProviderBuilder setProvider(String providerName)
    {
        this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));

        return this;
    }

    public DigestCalculatorProvider build()
        throws OperatorCreationException
    {
        return new DigestCalculatorProvider()
        {
            public DigestCalculator get(final AlgorithmIdentifier algorithm)
                throws OperatorCreationException
            {
                final DigestOutputStream stream;

                try
                {
                    MessageDigest dig = helper.createDigest(algorithm);

                    stream = new DigestOutputStream(dig);
                }
                catch (GeneralSecurityException e)
                {
                    throw new OperatorCreationException("exception on setup: " + e, e);
                }

                return new DigestCalculator()
                {
                    public AlgorithmIdentifier getAlgorithmIdentifier()
                    {
                        return algorithm;
                    }
                    
                    public OutputStream getOutputStream()
                    {
                        return stream;
                    }

                    public byte[] getDigest()
                    {
                        return stream.getDigest();
                    }
                };
            }
        };
    }

    private class DigestOutputStream
        extends OutputStream
    {
        private MessageDigest dig;

        DigestOutputStream(MessageDigest dig)
        {
            this.dig = dig;
        }

        public void write(byte[] bytes, int off, int len)
            throws IOException
        {
            dig.update(bytes, off, len);
        }

        public void write(byte[] bytes)
            throws IOException
        {
           dig.update(bytes);
        }

        public void write(int b)
            throws IOException
        {
           dig.update((byte)b);
        }

        byte[] getDigest()
        {
            return dig.digest();
        }
    }
}