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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 org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DLSequence;
import org.bouncycastle.asn1.cmp.PKIFailureInfo;
import org.bouncycastle.asn1.cmp.PKIFreeText;
import org.bouncycastle.asn1.cmp.PKIStatus;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.tsp.TimeStampResp;
import org.bouncycastle.util.Arrays;

/**
 * Base class for an RFC 3161 Time Stamp Response object.
 */
public class TimeStampResponse
{
    TimeStampResp   resp;
    TimeStampToken  timeStampToken;

    public TimeStampResponse(TimeStampResp resp)
        throws TSPException, IOException
    {
        this.resp = resp;
        
        if (resp.getTimeStampToken() != null)
        {
            timeStampToken = new TimeStampToken(resp.getTimeStampToken());
        }
    }

    /**
     * Create a TimeStampResponse from a byte array containing an ASN.1 encoding.
     * 
     * @param resp the byte array containing the encoded response.
     * @throws TSPException if the response is malformed.
     * @throws IOException if the byte array doesn't represent an ASN.1 encoding.
     */
    public TimeStampResponse(byte[] resp)
        throws TSPException, IOException
    {
        this(new ByteArrayInputStream(resp));
    }

    /**
     * Create a TimeStampResponse from an input stream containing an ASN.1 encoding.
     * 
     * @param in the input stream containing the encoded response.
     * @throws TSPException if the response is malformed.
     * @throws IOException if the stream doesn't represent an ASN.1 encoding.
     */
    public TimeStampResponse(InputStream in)
        throws TSPException, IOException
    {
        this(readTimeStampResp(in));
    }

    TimeStampResponse(DLSequence dlSequence)
        throws TSPException, IOException
    {
        try
        {
            resp = TimeStampResp.getInstance(dlSequence);
            timeStampToken = new TimeStampToken(ContentInfo.getInstance(dlSequence.getObjectAt(1)));
        }
        catch (IllegalArgumentException e)
        {
            throw new TSPException("malformed timestamp response: " + e, e);
        }
        catch (ClassCastException e)
        {
            throw new TSPException("malformed timestamp response: " + e, e);
        }
    }

    private static TimeStampResp readTimeStampResp(
        InputStream in) 
        throws IOException, TSPException
    {
        try
        {
            return TimeStampResp.getInstance(new ASN1InputStream(in).readObject());
        }
        catch (IllegalArgumentException e)
        {
            throw new TSPException("malformed timestamp response: " + e, e);
        }
        catch (ClassCastException e)
        {
            throw new TSPException("malformed timestamp response: " + e, e);
        }
    }
    
    public int getStatus()
    {
        return resp.getStatus().getStatus().intValue();
    }

    public String getStatusString()
    {
        if (resp.getStatus().getStatusString() != null)
        {
            StringBuffer statusStringBuf = new StringBuffer();
            PKIFreeText text = resp.getStatus().getStatusString();
            for (int i = 0; i != text.size(); i++)
            {
                statusStringBuf.append(text.getStringAt(i).getString());
            }
            return statusStringBuf.toString();
        }
        else
        {
            return null;
        }
    }

    public PKIFailureInfo getFailInfo()
    {
        if (resp.getStatus().getFailInfo() != null)
        {
            return new PKIFailureInfo(resp.getStatus().getFailInfo());
        }
        
        return null;
    }

    public TimeStampToken getTimeStampToken()
    {
        return timeStampToken;
    }

    /**
     * Check this response against to see if it a well formed response for 
     * the passed in request. Validation will include checking the time stamp
     * token if the response status is GRANTED or GRANTED_WITH_MODS.
     * 
     * @param request the request to be checked against
     * @throws TSPException if the request can not match this response.
     */
    public void validate(
        TimeStampRequest    request)
        throws TSPException
    {
        TimeStampToken tok = this.getTimeStampToken();
        
        if (tok != null)
        {
            TimeStampTokenInfo  tstInfo = tok.getTimeStampInfo();
            
            if (request.getNonce() != null && !request.getNonce().equals(tstInfo.getNonce()))
            {
                throw new TSPValidationException("response contains wrong nonce value.");
            }
            
            if (this.getStatus() != PKIStatus.GRANTED && this.getStatus() != PKIStatus.GRANTED_WITH_MODS)
            {
                throw new TSPValidationException("time stamp token found in failed request.");
            }
            
            if (!Arrays.constantTimeAreEqual(request.getMessageImprintDigest(), tstInfo.getMessageImprintDigest()))
            {
                throw new TSPValidationException("response for different message imprint digest.");
            }
            
            if (!tstInfo.getMessageImprintAlgOID().equals(request.getMessageImprintAlgOID()))
            {
                throw new TSPValidationException("response for different message imprint algorithm.");
            }

            Attribute scV1 = tok.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificate);
            Attribute scV2 = tok.getSignedAttributes().get(PKCSObjectIdentifiers.id_aa_signingCertificateV2);

            if (scV1 == null && scV2 == null)
            {
                throw new TSPValidationException("no signing certificate attribute present.");
            }

            if (scV1 != null && scV2 != null)
            {
                /*
                 * RFC 5035 5.4. If both attributes exist in a single message,
                 * they are independently evaluated. 
                 */
            }

            if (request.getReqPolicy() != null && !request.getReqPolicy().equals(tstInfo.getPolicy()))
            {
                throw new TSPValidationException("TSA policy wrong for request.");
            }
        }
        else if (this.getStatus() == PKIStatus.GRANTED || this.getStatus() == PKIStatus.GRANTED_WITH_MODS)
        {
            throw new TSPValidationException("no time stamp token found and one expected.");
        }
    }
    
    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded() throws IOException
    {
        return resp.getEncoded();
    }

    /**
     * return the ASN.1 encoded representation of this object for the specific encoding type.
     *
     * @param encoding encoding style ("DER", "DL", "BER")
     */
    public byte[] getEncoded(String encoding) throws IOException
    {
        if (ASN1Encoding.DL.equals(encoding))
        {
            if (timeStampToken == null)
            {
                return new DLSequence(resp.getStatus()).getEncoded(encoding);
            }

            return new DLSequence(new ASN1Encodable[] { resp.getStatus(),
                timeStampToken.toCMSSignedData().toASN1Structure() }).getEncoded(encoding);
        }
        return resp.getEncoded(encoding);
    }
}