任何人都可以帮助我理解在为签名加时间戳时使用的流程和Java API。
我需要使用Java API使用TSA url“http://timestamp.globalsign.com/scripts/timstamp.dll”对文件进行签名并对其加上时间戳。
我可以使用java.security API对文件进行签名,但无法为其加时间戳。
答案 0 :(得分:6)
你的问题有点广泛......我会给你一些信息,我希望它会指出你正确的方向。
问题是您希望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
。
首先,这项服务是Time-Stamp Protocol (TSP) RFC3161
编译,请查看RFC definition here,以便清楚了解其工作原理。
任何我认为你正在寻找一个java代码示例,所以下面我给你一个示例代码,它使用RFC3161的时间戳服务器执行时间戳签名。
此示例中的步骤基本上是:
首先创建时间戳请求,然后将请求发送给 服务,最后阅读回复。
时间戳请求具有以下定义:
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 }
正如您所看到的那样只需要
messageImprint
,其余的都是 可选的取决于你的tsp服务提供给你的选项。
第二步是使用
POST
方法发送此时间戳请求 指定为Content-type
http-header:application/timestamp-query
。
最后一部分是解析响应并获取时间戳令牌。
所以这是代码:
所有在一起:
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
。
希望这有帮助,