使用TSA URL和Java API的时间戳记 [英] Timestamping using TSA URL and Java APIs

问题描述

任何人都可以帮助我理解在给签名加上时间戳的同时使用的过程和Java API。

Can anyone please help me in understanding the process and Java APIs used while timestamping a signature.

我需要对文件签名并使用TSA网址对其加时间戳使用Java API的href = http://timestamp.globalsign.com/scripts/timstamp.dll rel = nofollow> http://timestamp.globalsign.com/scripts/timstamp.dll 。

I need to sign a file and timestamp it using TSA url "http://timestamp.globalsign.com/scripts/timstamp.dll" using Java APIs.

我可以使用java.security API对该文件签名，但无法为其添加时间戳。

I am able to sign the file using java.security APIs but unable to timestamp it.

推荐答案

您的问题有点宽泛...我将向您提供一些信息，希望它可以为您指明正确的方向。

Your question is a bit broad... I will give you some info which I hope it will point you on the right direction.

问题是，您想使用时间戳服务来使用其中的服务执行时间戳签名： http://timestamp.globalsign.com/scripts/timstamp.dll 。

The thing is that you want to use a timestamp service to perform a timestamp signature using the service there: http://timestamp.globalsign.com/scripts/timstamp.dll.

首先，此服务是时间戳协议（TSP）RFC3161 编译器， 此处的RFC定义以获得清晰的

First of all this service is an Time-Stamp Protocol (TSP) RFC3161 compilant, take a look on the RFC definition here to get a clear idea about how this works.

无论如何，我认为您正在寻找一个Java代码示例，因此下面我为您提供了一个示例代码，该示例代码使用

Anywise I think that you're looking for a java code example, so below I give you a sample code which performs a timestamp signature using a timestamp server of RFC3161.

此示例中的基本步骤是：

Basically the steps in this sample are:

首先创建时间戳请求，然后将请求发送到
服务，最后读取响应。

First create the timestamp request, then send the request to the service and finally read the response.

时间戳请求具有以下定义：

The timestamp request has the follow definition:

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  }

如您所见，仅需要 messageImprint ，其余为
可选，具体取决于您的tsp选项服务提供给您。

As you can see only the messageImprint it's required, the rest are optional an depends on the options of your tsp service gives to you.

第二步是使用<$ c发送此时间戳请求$ c> POST 方法将
指定为 Content-type http-header：
应用阳离子/时间戳查询。

Second step is to send this timestamp request using POST method an specifying as a Content-type http-header: application/timestamp-query.

最后一部分是解析响应并获取时间戳记令牌。

The last part is to parse the response and get the timestamp token.

所以这是代码：

所有：

import java.math.BigInteger;
import java.security.MessageDigest;
import java.util.Date;
import java.util.Random;

import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1StreamParser;
import org.bouncycastle.asn1.DERBoolean;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.tsp.MessageImprint;
import org.bouncycastle.asn1.tsp.TimeStampReq;
import org.bouncycastle.asn1.tsp.TimeStampResp;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.tsp.TimeStampResponse;
import org.bouncycastle.tsp.TimeStampToken;

public class TimeStampGenerationSample {

    public static void main(String args[]) throws Exception{

        // for this sample we will use SHA1 to perform the hashes
        // however feel free to use another algorithm since sha1 is weakness
        String sha1Oid = "1.3.14.3.2.26";
        // data to be timestamped
        byte[] data = "some sample data... or your signature...".getBytes();

        // perform the hash of your data
        byte[] digestData = MessageDigest.getInstance(sha1Oid, new BouncyCastleProvider()).digest(data);
        // generate random data to perform your ts, it's optional depends on your ts service
        Random rand = new Random(new Date().getTime()); 
        String nonce = BigInteger.valueOf(rand.nextLong()).toString();          
        // require cert optional (default false... so use false)
        boolean requireCert = false;
        // timestampPolicy it's an oid to identify a policy, if it's required
        // must be provided by your ts service... it's optional so we put null
        String timestampPolicy = null;      

        TimeStampReq ts_req = createTimeStampRequest(digestData, nonce, requireCert, sha1Oid, timestampPolicy);

        // the data to be send to the service
        byte[] dataToSend = ts_req.getEncoded();

        // simply send your data using POST method
        // don't forget to specify http-header content-type as "application/timestamp-query"
        byte[] response = // send the request as you want
        // parse the response 
        ASN1StreamParser asn1Sp = new ASN1StreamParser(response);
        TimeStampResp tspResp = new TimeStampResp((ASN1Sequence)asn1Sp.readObject());
        TimeStampResponse tsr = new TimeStampResponse(tspResp);
        // and get the timestamp token :)
        TimeStampToken token = tsr.getTimeStampToken();
    }

    /**
     * Create the timestamp request
     * @param hashedData
     * @param nonce
     * @param requireCert
     * @param digestAlgorithm
     * @param timestampPolicy
     * @return
     * @throws TimeStampGenerationException
     */
    public static TimeStampReq createTimeStampRequest(byte[] hashedData, String nonce, boolean requireCert, String digestAlgorithm, String timestampPolicy) throws TimeStampGenerationException {

        MessageImprint imprint = new MessageImprint(new AlgorithmIdentifier(digestAlgorithm), hashedData);

        TimeStampReq request = new TimeStampReq(
                imprint, 
                timestampPolicy!=null?new DERObjectIdentifier(timestampPolicy):null, 
                nonce!=null?new DERInteger(nonce.getBytes()):null, 
                new DERBoolean(requireCert), 
                null
        );      

        return request;
    }
}

请注意，我使用的是 bouncycastle API 。

希望这会有所帮助，

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