任何人都可以帮助我理解在为签名添加时间戳时使用的过程和 Java API。
我需要使用 Java API 使用 TSA url“http://timestamp.globalsign.com/scripts/timstamp.dll”对文件进行签名并为其添加时间戳。
我可以使用 java.security API 对文件进行签名,但无法为其添加时间戳。
最佳答案
你的问题有点宽泛......我会给你一些信息,我希望它能为你指明正确的方向。
事情是你想使用时间戳服务来使用那里的服务执行时间戳签名:http://timestamp.globalsign.com/scripts/timstamp.dll
。
首先,此服务是一个时间戳协议(protocol) (TSP) RFC3161
编译器,查看 RFC definition here以清楚了解其工作原理。
无论如何,我认为您正在寻找一个 java 代码示例,所以下面我给您一个示例代码,它使用 RFC3161 的时间戳服务器执行时间戳签名。
基本上这个示例中的步骤是:
-
First create the timestamp request, then send the request to the service and finally read the response.
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 }
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. -
Second step is to send this timestamp request using
POST
method an specifying as aContent-type
http-header:application/timestamp-query
. -
The last part is to parse the response and get the timestamp token.
代码如下:
一起:
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,我在示例中使用了 bouncycaSTLe API
。
希望对您有所帮助,
关于java - 使用 TSA URL 和 Java API 的时间戳,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28085619/