java tsa 时间撮服务
时间: 2023-11-12 14:46:08 浏览: 42
Java Tsa(时间戳服务)是一种数字签名技术,用于验证数字文件的时间戳。它可以证明一个数字文件在某个特定时间点之前存在,防止篡改和伪造。
Java Tsa服务可以使用Bouncy Castle库来实现。你可以使用以下代码示例来实现Java Tsa服务:
```java
import org.bouncycastle.tsp.TimeStampRequest;
import org.bouncycastle.tsp.TimeStampRequestGenerator;
import org.bouncycastle.tsp.TimeStampResponse;
import org.bouncycastle.tsp.TimeStampResponseGenerator;
import org.bouncycastle.tsp.TSPAlgorithms;
import org.bouncycastle.tsp.TSPException;
import java.io.IOException;
import java.math.BigInteger;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;
public class JavaTsaService {
public static void main(String[] args) throws NoSuchAlgorithmException, IOException, TSPException {
String fileToTimestamp = "path/to/file";
String tsaUrl = "https://timestamp.geotrust.com/tsa";
String hashAlg = "SHA-256";
// Generate a timestamp request
TimeStampRequestGenerator reqGen = new TimeStampRequestGenerator();
byte[] fileData = Files.readAllBytes(Paths.get(fileToTimestamp));
MessageDigest digest = MessageDigest.getInstance(hashAlg);
byte[] digestData = digest.digest(fileData);
TimeStampRequest req = reqGen.generate(TSPAlgorithms.SHA256, digestData, BigInteger.valueOf(new SecureRandom().nextInt()));
// Send the request to the TSA
URL url = new URL(tsaUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/timestamp-query");
conn.setRequestProperty("Content-Transfer-Encoding", "base64");
conn.getOutputStream().write(Base64.getEncoder().encode(req.getEncoded()));
conn.getOutputStream().flush();
// Read the response from the TSA
TimeStampResponseGenerator respGen = new TimeStampResponseGenerator();
TimeStampResponse resp = respGen.generate(conn.getInputStream());
// Print the timestamp token
System.out.println(Base64.getEncoder().encodeToString(resp.getTimeStampToken().getEncoded()));
}
}
```
这段代码使用SHA-256算法对文件进行哈希,然后生成一个时间戳请求并将其发送到指定的TSA URL。最后,它从TSA响应中提取时间戳令牌并将其打印出来。
请注意,你需要将Bouncy Castle库添加到类路径中,才能成功运行此代码。