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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.bc;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;

public class BcDigestCalculatorProvider
    implements DigestCalculatorProvider
{
    private BcDigestProvider digestProvider = BcDefaultDigestProvider.INSTANCE;

    public DigestCalculator get(final AlgorithmIdentifier algorithm)
        throws OperatorCreationException
    {
        Digest dig = digestProvider.get(algorithm);

        final DigestOutputStream stream = new DigestOutputStream(dig);

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

            public OutputStream getOutputStream()
            {
                return stream;
            }

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

    private static class DigestOutputStream
        extends OutputStream
    {
        private Digest dig;

        DigestOutputStream(Digest 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, 0, bytes.length);
        }

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

        byte[] getDigest()
        {
            byte[] d = new byte[dig.getDigestSize()];

            dig.doFinal(d, 0);

            return d;
        }
    }
}