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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 and up. 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.tsp.test;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.operator.DigestCalculator;


class SHA256DigestCalculator
    implements DigestCalculator
{
    private ByteArrayOutputStream bOut = new ByteArrayOutputStream();

    public AlgorithmIdentifier getAlgorithmIdentifier()
    {
        return new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256);
    }

    public OutputStream getOutputStream()
    {
        return bOut;
    }

    public byte[] getDigest()
    {
        byte[] bytes = bOut.toByteArray();

        bOut.reset();

        Digest sha256 = new SHA256Digest();

        sha256.update(bytes, 0, bytes.length);

        byte[] digest = new byte[sha256.getDigestSize()];

        sha256.doFinal(digest, 0);

        return digest;
    }
}