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How to parse the state secret digital certificate based on Java

Popularity：599 ℃/2024-09-19 11:29:59

I. Description

With the growing importance of information security, digital certificates play a crucial role in various secure communication scenarios. The state secret algorithm, as a cryptographic algorithm standard independently developed by our country, is also more and more widely used. However, when parsing digital certificates using the state secret algorithm in the Java environment, we may encounter some challenges.

This article focuses on sharing how theJava The parsing is done using theSM3WITHSM2 State-secret digital certificates for issuing algorithms.

 

II. Background to the issue

Digital certificates usually followX.509 formatting standards, while in theJava In this case, we usually use the tools under the package to parse these certificates. However, when certificates use state secret algorithms such as theSM3WITHSM2 When the standardJava The library may not be able to recognize this algorithm-specific elliptic curve and therefore throw an exception when parsing.

For example, when trying to parse a certificate that uses the state secret algorithm using the following code:

CertificateFactory cf = ("X509");
String filePath ="C:\\Users\\example\\Desktop\\";
FileInputStream in =new FileInputStream(filePath);
X509Certificate cer = (X509Certificate) (in);

The following error may be encountered:

: : Unknown named curve: 1.2.156.10197.1.301

This error suggests thatJava The standard library does not recognize the elliptic curve used by the state secret algorithm.

 

III. Solutions

To solve this problem, we need to resort to theBouncyCastle This powerful encryption library, which provides support for a wide range of encryption algorithms, including state secret algorithms.

Step 1: Add BouncyCastle Dependency

First, it is necessary to place theBouncyCastle library is added to the project in the Add the following dependency to the

<dependency>
		<groupId></groupId>
		<artifactId>bcprov-jdk15on</artifactId>
		<version>1.62</version>
</dependency>

Step 2: Modify the code to use BouncyCastle

Next the code needs to be modified to be used when parsing certificatesBouncyCastle Provider:

// pull intoBCstorehouse
(new BouncyCastleProvider());
// utilizationBCanalyzeX.509certificates
CertificateFactory cf = ("X509", "BC");

The complete test code is as follows:

import ;
import ;
import ;
import .X509Certificate;
import ;
  
public class SMCertificateParser {
    public static void main(String[] args) {
        try {
            // enrollmentBouncyCastleprovider
            (new BouncyCastleProvider());
              
            // utilizationBouncyCastleprovider解析X.509certificates
            CertificateFactory cf = ("X509", "BC");
            String filePath = "C:\\Users\\example\\Desktop\\";
            FileInputStream in = new FileInputStream(filePath);
            X509Certificate cer = (X509Certificate) (in);
              
            // 打印certificates信息
            ("version number：" + ());
            ("product key (software)：" + ().toString());
            ("validity period：from：" + () + " to: " + ());
            ("Issuance Algorithm：" + ());
            ("Issuance AlgorithmID：" + ());
              
            ();
        } catch (Exception e) {
            ();
        }  
    }  
}

After executing the program, the following message is output:

Version number: 3
Serial Number: 228766466093659650410797181222534438848
Validity period: from: Mon Mar 13 17:31:00 CST 2023 to: Mon Feb 23 17:31:00 CST 2093
Issuing Algorithm: SM3WITHSM2
Issuing Algorithm ID: 1.2.156.10197.1.501

 

IV. Conclusion

by introducingBouncyCastle library and modified the code to use it, we are now able to successfully parse the code using the state secretSM3WITHSM2 algorithms for digital certificates. This solution is not limited toSM3WITHSM2 It also applies to other state secret algorithms or any non-standard algorithm as long as theBouncyCastle The library supports these algorithms.

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