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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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);
        }
    }
}