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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.cert.cmp;

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

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;

class CMPUtil
{
    static byte[] calculateCertHash(ASN1Object obj, AlgorithmIdentifier signatureAlgorithm,
        DigestCalculatorProvider digesterProvider, DigestAlgorithmIdentifierFinder digestAlgFinder)
        throws CMPException
    {
        AlgorithmIdentifier digestAlgorithm = digestAlgFinder.find(signatureAlgorithm);
        if (digestAlgorithm == null)
        {
            throw new CMPException("cannot find digest algorithm from signature algorithm");
        }

        return calculateDigest(obj, digestAlgorithm, digesterProvider);
    }

    static byte[] calculateDigest(ASN1Object obj, AlgorithmIdentifier digestAlgorithm,
        DigestCalculatorProvider digesterProvider)
        throws CMPException
    {
        DigestCalculator digestCalculator = getDigestCalculator(digestAlgorithm, digesterProvider);

        derEncodeToStream(obj, digestCalculator.getOutputStream());

        return digestCalculator.getDigest();
    }

    static void derEncodeToStream(ASN1Object obj, OutputStream stream)
    {
        try
        {
            obj.encodeTo(stream, ASN1Encoding.DER);
            stream.close();
        }
        catch (IOException e)
        {
            throw new CMPRuntimeException("unable to DER encode object: " + e.getMessage(), e);
        }
    }

    static DigestCalculator getDigestCalculator(AlgorithmIdentifier digestAlgorithm,
        DigestCalculatorProvider digesterProvider)
        throws CMPException
    {
        try
        {
            return digesterProvider.get(digestAlgorithm);
        }
        catch (OperatorCreationException e)
        {
            throw new CMPException("unable to create digester: " + e.getMessage(), e);
        }
    }
}