java - 如何在没有请求者签名的情况下用 Java 生成 CSR？

Question

基本上，我需要先隔离构造的 CSR(证书签名请求)的数据，然后再由发出请求的实体首次签名，最好是在 Java 中。非常感谢!

注意随后如何将签名附加到 CSR 也很有用，因为 CSR 数据最初将由 HSM 签名。

Answer 1

希望对您有所帮助:

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;


import javax.security.auth.x500.X500Principal;

import sun.security.pkcs10.*;
import sun.security.x509.*;

public class GenerateCSR {
    private static PublicKey publicKey = null;
    private static PrivateKey privateKey = null;
    private static KeyPairGenerator keyGen = null;
    private static GenerateCSR gcsr = null;

    private GenerateCSR() {
        try {
            keyGen = KeyPairGenerator.getInstance("RSA");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        keyGen.initialize(2048, new SecureRandom());
        KeyPair keypair = keyGen.generateKeyPair();
        publicKey = keypair.getPublic();
        privateKey = keypair.getPrivate();
    }

    public static GenerateCSR getInstance() {
        if (gcsr == null)
            gcsr = new GenerateCSR();
        return gcsr;
    }

    public String getCSR(String cn) throws Exception {
        byte[] csr = generatePKCS10(cn, "Java", "JournalDev", "Cupertino",
                "California", "USA");
        return new String(csr);
    }

    /**
     *
     * @param CN
     *            Common Name, is X.509 speak for the name that distinguishes
     *            the Certificate best, and ties it to your Organization
     * @param OU
     *            Organizational unit
     * @param O
     *            Organization NAME
     * @param L
     *            Location
     * @param S
     *            State
     * @param C
     *            Country
     * @return
     * @throws Exception
     */
    private static byte[] generatePKCS10(String CN, String OU, String O,
            String L, String S, String C) throws Exception {
        // generate PKCS10 certificate request
        String sigAlg = "MD5WithRSA";
        PKCS10 pkcs10 = new PKCS10(publicKey);
        Signature signature = Signature.getInstance(sigAlg);
        signature.initSign(privateKey);
        // common, orgUnit, org, locality, state, country
        X500Principal principal = new X500Principal( "CN=Ole Nordmann, OU=ACME, O=Sales, C=NO");

   //     pkcs10CertificationRequest kpGen = new PKCS10CertificationRequest(sigAlg, principal, publicKey, null, privateKey);  
     //   byte[] c = kpGen.getEncoded();  
        X500Name x500name=null;
        x500name= new X500Name(principal.getEncoded());
      pkcs10.encodeAndSign(x500name, signature);
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(bs);
        pkcs10.print(ps);
        byte[] c = bs.toByteArray();
        try {
            if (ps != null)
                ps.close();
            if (bs != null)
                bs.close();
        } catch (Throwable th) {
        }
        return c;
    }

    public PublicKey getPublicKey() {
        return publicKey;
    }

    public PrivateKey getPrivateKey() {
        return privateKey;
    }

    public static void main(String[] args) throws Exception {
        GenerateCSR gcsr = GenerateCSR.getInstance();

        System.out.println("Public Key:\n"+gcsr.getPublicKey().toString());

        System.out.println("Private Key:\n"+gcsr.getPrivateKey().toString());
        String csr = gcsr.getCSR("journaldev.com <http://www.journaldev.com>");
        System.out.println("CSR Request Generated!!");
        System.out.println(csr);
    }

}