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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.tsp;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.cmp.PKIFailureInfo;
import org.bouncycastle.asn1.tsp.TimeStampReq;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;

/**
 * Base class for an RFC 3161 Time Stamp Request.
 */
public class TimeStampRequest
{
    private static Set EMPTY_SET = Collections.unmodifiableSet(new HashSet());

    private TimeStampReq req;
    private Extensions extensions;

    public TimeStampRequest(TimeStampReq req)
    {
        this.req = req;
        this.extensions = req.getExtensions();
    }

    /**
     * Create a TimeStampRequest from the past in byte array.
     * 
     * @param req byte array containing the request.
     * @throws IOException if the request is malformed.
     */
    public TimeStampRequest(byte[] req) 
        throws IOException
    {
        this(new ByteArrayInputStream(req));
    }

    /**
     * Create a TimeStampRequest from the past in input stream.
     * 
     * @param in input stream containing the request.
     * @throws IOException if the request is malformed.
     */
    public TimeStampRequest(InputStream in) 
        throws IOException
    {
        this(loadRequest(in));
    }

    private static TimeStampReq loadRequest(InputStream in)
        throws IOException
    {
        try
        {
            return TimeStampReq.getInstance(new ASN1InputStream(in).readObject());
        }
        catch (ClassCastException e)
        {
            throw new IOException("malformed request: " + e);
        }
        catch (IllegalArgumentException e)
        {
            throw new IOException("malformed request: " + e);
        }
    }

    public int getVersion()
    {
        return req.getVersion().getValue().intValue();
    }

    public ASN1ObjectIdentifier getMessageImprintAlgOID()
    {
        return req.getMessageImprint().getHashAlgorithm().getAlgorithm();
    }

    public byte[] getMessageImprintDigest()
    {
        return req.getMessageImprint().getHashedMessage();
    }

    public ASN1ObjectIdentifier getReqPolicy()
    {
        if (req.getReqPolicy() != null)
        {
            return req.getReqPolicy();
        }
        else
        {
            return null;
        }
    }

    public BigInteger getNonce()
    {
        if (req.getNonce() != null)
        {
            return req.getNonce().getValue();
        }
        else
        {
            return null;
        }
    }

    public boolean getCertReq()
    {
        if (req.getCertReq() != null)
        {
            return req.getCertReq().isTrue();
        }
        else
        {
            return false;
        }
    }

    /**
     * Validate the timestamp request, checking the digest to see if it is of an
     * accepted type and whether it is of the correct length for the algorithm specified.
     *
     * @param algorithms a set of OIDs giving accepted algorithms.
     * @param policies if non-null a set of policies OIDs we are willing to sign under.
     * @param extensions if non-null a set of extensions OIDs we are willing to accept.
     * @throws TSPException if the request is invalid, or processing fails.
     */
    public void validate(
        Set    algorithms,
        Set    policies,
        Set    extensions)
        throws TSPException
    {
        algorithms = convert(algorithms);
        policies = convert(policies);
        extensions = convert(extensions);

        if (!algorithms.contains(this.getMessageImprintAlgOID()))
        {
            throw new TSPValidationException("request contains unknown algorithm.", PKIFailureInfo.badAlg);
        }

        if (policies != null && this.getReqPolicy() != null && !policies.contains(this.getReqPolicy()))
        {
            throw new TSPValidationException("request contains unknown policy.", PKIFailureInfo.unacceptedPolicy);
        }

        if (this.getExtensions() != null && extensions != null)
        {
            Enumeration en = this.getExtensions().oids();
            while(en.hasMoreElements())
            {
                String  oid = ((DERObjectIdentifier)en.nextElement()).getId();
                if (!extensions.contains(oid))
                {
                    throw new TSPValidationException("request contains unknown extension.", PKIFailureInfo.unacceptedExtension);
                }
            }
        }

        int digestLength = TSPUtil.getDigestLength(this.getMessageImprintAlgOID().getId());

        if (digestLength != this.getMessageImprintDigest().length)
        {
            throw new TSPValidationException("imprint digest the wrong length.", PKIFailureInfo.badDataFormat);
        }
    }

   /**
    * return the ASN.1 encoded representation of this object.
    * @return the default ASN,1 byte encoding for the object.
    */
    public byte[] getEncoded() throws IOException
    {
        return req.getEncoded();
    }

    Extensions getExtensions()
    {
        return extensions;
    }

    public boolean hasExtensions()
    {
        return extensions != null;
    }

    public Extension getExtension(ASN1ObjectIdentifier oid)
    {
        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    public List getExtensionOIDs()
    {
        return TSPUtil.getExtensionOIDs(extensions);
    }

    /**
     * Returns a set of ASN1ObjectIdentifiers giving the non-critical extensions.
     * @return a set of ASN1ObjectIdentifiers.
     */
    public Set getNonCriticalExtensionOIDs()
    {
        if (extensions == null)
        {
            return EMPTY_SET;
        }

        return Collections.unmodifiableSet(new HashSet(Arrays.asList(extensions.getNonCriticalExtensionOIDs())));
    }

    /**
     * Returns a set of ASN1ObjectIdentifiers giving the critical extensions.
     * @return a set of ASN1ObjectIdentifiers.
     */
    public Set getCriticalExtensionOIDs()
    {
        if (extensions == null)
        {
            return EMPTY_SET;
        }

        return Collections.unmodifiableSet(new HashSet(Arrays.asList(extensions.getCriticalExtensionOIDs())));
    }

    private Set convert(Set orig)
    {
        if (orig == null)
        {
            return orig;
        }

        Set con = new HashSet(orig.size());

        for (Iterator it = orig.iterator(); it.hasNext();)
        {
            Object o = it.next();

            if (o instanceof String)
            {
                con.add(new ASN1ObjectIdentifier((String)o));
            }
            else
            {
                con.add(o);
            }
        }

        return con;
    }
}