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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls 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 and used appropriately.
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package org.bouncycastle.asn1.tsp;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;

public class TSTInfo
    extends ASN1Object
{
    private ASN1Integer version;
    private ASN1ObjectIdentifier tsaPolicyId;
    private MessageImprint messageImprint;
    private ASN1Integer serialNumber;
    private ASN1GeneralizedTime genTime;
    private Accuracy accuracy;
    private ASN1Boolean ordering;
    private ASN1Integer nonce;
    private GeneralName tsa;
    private Extensions extensions;

    public static TSTInfo getInstance(Object o)
    {
        if (o instanceof TSTInfo)
        {
            return (TSTInfo)o;
        }
        else if (o != null)
        {
            return new TSTInfo(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    private TSTInfo(ASN1Sequence seq)
    {
        Enumeration e = seq.getObjects();

        // version
        version = ASN1Integer.getInstance(e.nextElement());

        // tsaPolicy
        tsaPolicyId = ASN1ObjectIdentifier.getInstance(e.nextElement());

        // messageImprint
        messageImprint = MessageImprint.getInstance(e.nextElement());

        // serialNumber
        serialNumber = ASN1Integer.getInstance(e.nextElement());

        // genTime
        genTime = ASN1GeneralizedTime.getInstance(e.nextElement());

        // default for ordering
        ordering = ASN1Boolean.getInstance(false);
        
        while (e.hasMoreElements())
        {
            ASN1Object o = (ASN1Object) e.nextElement();

            if (o instanceof ASN1TaggedObject)
            {
                ASN1TaggedObject tagged = (ASN1TaggedObject) o;

                switch (tagged.getTagNo())
                {
                case 0:
                    tsa = GeneralName.getInstance(tagged, true);
                    break;
                case 1:
                    extensions = Extensions.getInstance(tagged, false);
                    break;
                default:
                    throw new IllegalArgumentException("Unknown tag value " + tagged.getTagNo());
                }
            }
            else if (o instanceof ASN1Sequence || o instanceof Accuracy)
            {
                accuracy = Accuracy.getInstance(o);
            }
            else if (o instanceof ASN1Boolean)
            {
                ordering = ASN1Boolean.getInstance(o);
            }
            else if (o instanceof ASN1Integer)
            {
                nonce = ASN1Integer.getInstance(o);
            }

        }
    }

    public TSTInfo(ASN1ObjectIdentifier tsaPolicyId, MessageImprint messageImprint,
            ASN1Integer serialNumber, ASN1GeneralizedTime genTime,
            Accuracy accuracy, ASN1Boolean ordering, ASN1Integer nonce,
            GeneralName tsa, Extensions extensions)
    {
        version = new ASN1Integer(1);
        this.tsaPolicyId = tsaPolicyId;
        this.messageImprint = messageImprint;
        this.serialNumber = serialNumber;
        this.genTime = genTime;

        this.accuracy = accuracy;
        this.ordering = ordering;
        this.nonce = nonce;
        this.tsa = tsa;
        this.extensions = extensions;
    }

    public ASN1Integer getVersion()
    {
        return version;
    }

    public MessageImprint getMessageImprint()
    {
        return messageImprint;
    }

    public ASN1ObjectIdentifier getPolicy()
    {
        return tsaPolicyId;
    }

    public ASN1Integer getSerialNumber()
    {
        return serialNumber;
    }

    public Accuracy getAccuracy()
    {
        return accuracy;
    }

    public ASN1GeneralizedTime getGenTime()
    {
        return genTime;
    }

    public ASN1Boolean getOrdering()
    {
        return ordering;
    }

    public ASN1Integer getNonce()
    {
        return nonce;
    }

    public GeneralName getTsa()
    {
        return tsa;
    }

    public Extensions getExtensions()
    {
        return extensions;
    }

    /**
     *      * 
     *     TSTInfo ::= SEQUENCE  {
     *        version                      INTEGER  { v1(1) },
     *        policy                       TSAPolicyId,
     *        messageImprint               MessageImprint,
     *          -- MUST have the same value as the similar field in
     *          -- TimeStampReq
     *        serialNumber                 INTEGER,
     *         -- Time-Stamping users MUST be ready to accommodate integers
     *         -- up to 160 bits.
     *        genTime                      GeneralizedTime,
     *        accuracy                     Accuracy                 OPTIONAL,
     *        ordering                     BOOLEAN             DEFAULT FALSE,
     *        nonce                        INTEGER                  OPTIONAL,
     *          -- MUST be present if the similar field was present
     *          -- in TimeStampReq.  In that case it MUST have the same value.
     *        tsa                          [0] GeneralName          OPTIONAL,
     *        extensions                   [1] IMPLICIT Extensions   OPTIONAL  }
     * 
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector seq = new ASN1EncodableVector(10);
        seq.add(version);

        seq.add(tsaPolicyId);
        seq.add(messageImprint);
        seq.add(serialNumber);
        seq.add(genTime);

        if (accuracy != null)
        {
            seq.add(accuracy);
        }
        
        if (ordering != null && ordering.isTrue())
        {
            seq.add(ordering);
        }
        
        if (nonce != null)
        {
            seq.add(nonce);
        }
        
        if (tsa != null)
        {
            seq.add(new DERTaggedObject(true, 0, tsa));
        }
        
        if (extensions != null)
        {
            seq.add(new DERTaggedObject(false, 1, extensions));
        }

        return new DERSequence(seq);
    }
}