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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);
    }
}