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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.cms;

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

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.Evidence;
import org.bouncycastle.asn1.cms.TimeStampAndCRL;
import org.bouncycastle.asn1.cms.TimeStampedData;
import org.bouncycastle.asn1.cms.TimeStampedDataParser;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.tsp.TSPException;
import org.bouncycastle.tsp.TimeStampToken;
import org.bouncycastle.tsp.TimeStampTokenInfo;
import org.bouncycastle.util.Arrays;

class TimeStampDataUtil
{
    private final TimeStampAndCRL[] timeStamps;

    private final MetaDataUtil      metaDataUtil;

    TimeStampDataUtil(TimeStampedData timeStampedData)
    {
        this.metaDataUtil = new MetaDataUtil(timeStampedData.getMetaData());

        Evidence evidence = timeStampedData.getTemporalEvidence();
        this.timeStamps = evidence.getTstEvidence().toTimeStampAndCRLArray();
    }

    TimeStampDataUtil(TimeStampedDataParser timeStampedData)
        throws IOException
    {       
        this.metaDataUtil = new MetaDataUtil(timeStampedData.getMetaData());

        Evidence evidence = timeStampedData.getTemporalEvidence();
        this.timeStamps = evidence.getTstEvidence().toTimeStampAndCRLArray();
    }

    TimeStampToken getTimeStampToken(TimeStampAndCRL timeStampAndCRL)
        throws CMSException
    {
        ContentInfo timeStampToken = timeStampAndCRL.getTimeStampToken();

        try
        {
            TimeStampToken token = new TimeStampToken(timeStampToken);
            return token;
        }
        catch (IOException e)
        {
            throw new CMSException("unable to parse token data: " + e.getMessage(), e);
        }
        catch (TSPException e)
        {
            if (e.getCause() instanceof CMSException)
            {
                throw (CMSException)e.getCause();
            }

            throw new CMSException("token data invalid: " + e.getMessage(), e);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException("token data invalid: " + e.getMessage(), e);
        }
    }

    void initialiseMessageImprintDigestCalculator(DigestCalculator calculator)
        throws CMSException
    {
        metaDataUtil.initialiseMessageImprintDigestCalculator(calculator);
    }

    DigestCalculator getMessageImprintDigestCalculator(DigestCalculatorProvider calculatorProvider)
        throws OperatorCreationException
    {
        TimeStampToken token;

        try
        {
            token = this.getTimeStampToken(timeStamps[0]);

            TimeStampTokenInfo info = token.getTimeStampInfo();
            ASN1ObjectIdentifier algOID = info.getMessageImprintAlgOID();

            DigestCalculator calc = calculatorProvider.get(new AlgorithmIdentifier(algOID));

            initialiseMessageImprintDigestCalculator(calc);

            return calc;
        }
        catch (CMSException e)
        {
            throw new OperatorCreationException("unable to extract algorithm ID: " + e.getMessage(), e);
        }
    }

    TimeStampToken[] getTimeStampTokens()
        throws CMSException
    {
        TimeStampToken[] tokens = new TimeStampToken[timeStamps.length];
        for (int i = 0; i < timeStamps.length; i++)
        {
            tokens[i] = this.getTimeStampToken(timeStamps[i]);
        }

        return tokens;
    }

    TimeStampAndCRL[] getTimeStamps()
    {
        return timeStamps;
    }

    byte[] calculateNextHash(DigestCalculator calculator)
        throws CMSException
    {
        TimeStampAndCRL tspToken = timeStamps[timeStamps.length - 1];

        OutputStream out = calculator.getOutputStream();

        try
        {
            out.write(tspToken.getEncoded(ASN1Encoding.DER));

            out.close();

            return calculator.getDigest();
        }
        catch (IOException e)
        {
            throw new CMSException("exception calculating hash: " + e.getMessage(), e);
        }
    }

    /**
     * Validate the digests present in the TimeStampTokens contained in the CMSTimeStampedData.
     */
    void validate(DigestCalculatorProvider calculatorProvider, byte[] dataDigest)
        throws ImprintDigestInvalidException, CMSException
    {
        byte[] currentDigest = dataDigest;

        for (int i = 0; i < timeStamps.length; i++)
        {
            try
            {
                TimeStampToken token = this.getTimeStampToken(timeStamps[i]);
                if (i > 0)
                {
                    TimeStampTokenInfo info = token.getTimeStampInfo();
                    DigestCalculator calculator = calculatorProvider.get(info.getHashAlgorithm());

                    calculator.getOutputStream().write(timeStamps[i - 1].getEncoded(ASN1Encoding.DER));

                    currentDigest = calculator.getDigest();
                }

                this.compareDigest(token, currentDigest);
            }
            catch (IOException e)
            {
                throw new CMSException("exception calculating hash: " + e.getMessage(), e);
            }
            catch (OperatorCreationException e)
            {
                throw new CMSException("cannot create digest: " + e.getMessage(), e);
            }
        }
    }

    void validate(DigestCalculatorProvider calculatorProvider, byte[] dataDigest, TimeStampToken timeStampToken)
        throws ImprintDigestInvalidException, CMSException
    {
        byte[] currentDigest = dataDigest;
        byte[] encToken;

        try
        {
            encToken = timeStampToken.getEncoded();
        }
        catch (IOException e)
        {
            throw new CMSException("exception encoding timeStampToken: " + e.getMessage(), e);
        }

        for (int i = 0; i < timeStamps.length; i++)
        {
            try
            {
                TimeStampToken token = this.getTimeStampToken(timeStamps[i]);
                if (i > 0)
                {
                    TimeStampTokenInfo info = token.getTimeStampInfo();
                    DigestCalculator calculator = calculatorProvider.get(info.getHashAlgorithm());

                    calculator.getOutputStream().write(timeStamps[i - 1].getEncoded(ASN1Encoding.DER));

                    currentDigest = calculator.getDigest();
                }

                this.compareDigest(token, currentDigest);

                if (Arrays.areEqual(token.getEncoded(), encToken))
                {
                    return;
                }
            }
            catch (IOException e)
            {
                throw new CMSException("exception calculating hash: " + e.getMessage(), e);
            }
            catch (OperatorCreationException e)
            {
                throw new CMSException("cannot create digest: " + e.getMessage(), e);
            }
        }

        throw new ImprintDigestInvalidException("passed in token not associated with timestamps present", timeStampToken);
    }

    private void compareDigest(TimeStampToken timeStampToken, byte[] digest)
        throws ImprintDigestInvalidException
    {
        TimeStampTokenInfo info = timeStampToken.getTimeStampInfo();
        byte[] tsrMessageDigest = info.getMessageImprintDigest();

        if (!Arrays.areEqual(digest, tsrMessageDigest))
        {
            throw new ImprintDigestInvalidException("hash calculated is different from MessageImprintDigest found in TimeStampToken", timeStampToken);
        }
    }

    String getFileName()
    {
        return metaDataUtil.getFileName();
    }

    String getMediaType()
    {
        return metaDataUtil.getMediaType();
    }

    AttributeTable getOtherMetaData()
    {
        return new AttributeTable(metaDataUtil.getOtherMetaData());
    }
}