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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.dvcs;

import java.io.OutputStream;

import org.bouncycastle.asn1.x509.DigestInfo;
import org.bouncycastle.operator.DigestCalculator;

public class MessageImprintBuilder
{
    private final DigestCalculator digestCalculator;

    public MessageImprintBuilder(DigestCalculator digestCalculator)
    {
        this.digestCalculator = digestCalculator;
    }

    public MessageImprint build(byte[] message)
        throws DVCSException
    {
        try
        {
            OutputStream dOut = digestCalculator.getOutputStream();

            dOut.write(message);

            dOut.close();

            return new MessageImprint(new DigestInfo(digestCalculator.getAlgorithmIdentifier(), digestCalculator.getDigest()));
        }
        catch (Exception e)
        {
            throw new DVCSException("unable to build MessageImprint: " + e.getMessage(), e);
        }
    }
}