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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 org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1EncodableVector;
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;

public class TimeStampReq
    extends ASN1Object
{
    ASN1Integer version;

    MessageImprint messageImprint;

    ASN1ObjectIdentifier tsaPolicy;

    ASN1Integer nonce;

    ASN1Boolean certReq;

    Extensions extensions;

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

        return null;
    }

    private TimeStampReq(ASN1Sequence seq)
    {
        int nbObjects = seq.size();

        int seqStart = 0;

        // version
        version = ASN1Integer.getInstance(seq.getObjectAt(seqStart));

        seqStart++;

        // messageImprint
        messageImprint = MessageImprint.getInstance(seq.getObjectAt(seqStart));

        seqStart++;

        for (int opt = seqStart; opt < nbObjects; opt++)
        {
            // tsaPolicy
            if (seq.getObjectAt(opt) instanceof ASN1ObjectIdentifier)
            {
                checkOption(tsaPolicy, opt, 2);
                tsaPolicy = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(opt));
            }
            // nonce
            else if (seq.getObjectAt(opt) instanceof ASN1Integer)
            {
                checkOption(nonce, opt, 3);
                nonce = ASN1Integer.getInstance(seq.getObjectAt(opt));
            }
            // certReq
            else if (seq.getObjectAt(opt) instanceof ASN1Boolean)
            {
                checkOption(certReq, opt, 4);
                certReq = ASN1Boolean.getInstance(seq.getObjectAt(opt));
            }
            // extensions
            else if (seq.getObjectAt(opt) instanceof ASN1TaggedObject)
            {
                checkOption(extensions, opt, 5);
                ASN1TaggedObject    tagged = (ASN1TaggedObject)seq.getObjectAt(opt);
                if (tagged.getTagNo() == 0)
                {
                    extensions = Extensions.getInstance(tagged, false);
                }
            }
            else
            {
                throw new IllegalArgumentException("unidentified structure in sequence");
            }
        }
    }

    private void checkOption(Object o, int index, int maxOption)
    {
        if (o != null || index > maxOption)
        {
            throw new IllegalArgumentException("badly placed optional in sequence");
        }
    }

    public TimeStampReq(
        MessageImprint      messageImprint,
        ASN1ObjectIdentifier tsaPolicy,
        ASN1Integer          nonce,
        ASN1Boolean          certReq,
        Extensions      extensions)
    {
        // default
        version = new ASN1Integer(1);

        this.messageImprint = messageImprint;
        this.tsaPolicy = tsaPolicy;
        this.nonce = nonce;
        this.certReq = certReq;
        this.extensions = extensions;
    }

    public ASN1Integer getVersion()
    {
        return version;
    }

    public MessageImprint getMessageImprint()
    {
        return messageImprint;
    }

    public ASN1ObjectIdentifier getReqPolicy()
    {
        return tsaPolicy;
    }

    public ASN1Integer getNonce()
    {
        return nonce;
    }

    public ASN1Boolean getCertReq()
    {
        if (certReq == null)
        {
            return ASN1Boolean.FALSE;
        }
        return certReq;
    }

    public Extensions getExtensions()
    {
        return extensions;
    }

    /**
     *      * TimeStampReq ::= SEQUENCE  {
     *  version                      INTEGER  { v1(1) },
     *  messageImprint               MessageImprint,
     *    --a hash algorithm OID and the hash value of the data to be
     *    --time-stamped
     *  reqPolicy             TSAPolicyId              OPTIONAL,
     *  nonce                 INTEGER                  OPTIONAL,
     *  certReq               BOOLEAN                  DEFAULT FALSE,
     *  extensions            [0] IMPLICIT Extensions  OPTIONAL
     * }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(6);
        
        v.add(version);
        v.add(messageImprint);
        
        if (tsaPolicy != null)
        {
            v.add(tsaPolicy);
        }
        
        if (nonce != null)
        {
            v.add(nonce);
        }
        
        if (certReq != null && certReq.isTrue())
        {
            v.add(certReq);
        }
        
        if (extensions != null)
        {
            v.add(new DERTaggedObject(false, 0, extensions));
        }

        return new DERSequence(v);
    }
}