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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.IOException;
import java.math.BigInteger;
import java.text.ParseException;
import java.util.Date;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.tsp.Accuracy;
import org.bouncycastle.asn1.tsp.TSTInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;

public class TimeStampTokenInfo
{
    TSTInfo tstInfo;
    Date    genTime;
    
    TimeStampTokenInfo(TSTInfo tstInfo)
        throws TSPException, IOException
    {
        this.tstInfo = tstInfo;

        try
        {
            this.genTime = tstInfo.getGenTime().getDate();
        }
        catch (ParseException e)
        {
            throw new TSPException("unable to parse genTime field");
        }
    }

    public boolean isOrdered()
    {
        return tstInfo.getOrdering().isTrue();
    }

    public Accuracy getAccuracy()
    {
        return tstInfo.getAccuracy();
    }

    public Date getGenTime()
    {
        return genTime;
    }

    public GenTimeAccuracy getGenTimeAccuracy()
    {
        if (this.getAccuracy() != null)
        {
            return new GenTimeAccuracy(this.getAccuracy());
        }
        
        return null;
    }
    
    public ASN1ObjectIdentifier getPolicy()
    {
        return tstInfo.getPolicy();
    }
    
    public BigInteger getSerialNumber()
    {
        return tstInfo.getSerialNumber().getValue();
    }

    public GeneralName getTsa()
    {
        return tstInfo.getTsa();
    }

    public Extensions getExtensions()
    {
        return tstInfo.getExtensions();
    }

    /**
     * @return the nonce value, null if there isn't one.
     */
    public BigInteger getNonce()
    {
        if (tstInfo.getNonce() != null)
        {
            return tstInfo.getNonce().getValue();
        }

        return null;
    }

    public AlgorithmIdentifier getHashAlgorithm()
    {
        return tstInfo.getMessageImprint().getHashAlgorithm();
    }

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

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

    public byte[] getEncoded() 
        throws IOException
    {
        return tstInfo.getEncoded();
    }

    /**
     * @deprecated use toASN1Structure
     */
    public TSTInfo toTSTInfo()
    {
        return tstInfo;
    }

    public TSTInfo toASN1Structure()
    {
        return tstInfo;
    }
}