在没有BouncyCastle的Java中创建X509证书?

是的,但不是公开记录的类。我已经记录了这个过程 in this article .

import sun.security.x509.*;
import java.security.cert.*;
import java.security.*;
import java.math.BigInteger;
import java.util.Date;
import java.io.IOException

/** 
 * Create a self-signed X.509 Certificate
 * @param dn the X.509 Distinguished Name, eg "CN=Test, L=London, C=GB"
 * @param pair the KeyPair
 * @param days how many days from now the Certificate is valid for
 * @param algorithm the signing algorithm, eg "SHA1withRSA"
 */ 
X509Certificate generateCertificate(String dn, KeyPair pair, int days, String algorithm)
  throws GeneralSecurityException, IOException
{
  PrivateKey privkey = pair.getPrivate();
  X509CertInfo info = new X509CertInfo();
  Date from = new Date();
  Date to = new Date(from.getTime() + days * 86400000l);
  CertificateValidity interval = new CertificateValidity(from, to);
  BigInteger sn = new BigInteger(64, new SecureRandom());
  X500Name owner = new X500Name(dn);
 
  info.set(X509CertInfo.VALIDITY, interval);
  info.set(X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber(sn));
  info.set(X509CertInfo.SUBJECT, new CertificateSubjectName(owner));
  info.set(X509CertInfo.ISSUER, new CertificateIssuerName(owner));
  info.set(X509CertInfo.KEY, new CertificateX509Key(pair.getPublic()));
  info.set(X509CertInfo.VERSION, new CertificateVersion(CertificateVersion.V3));
  AlgorithmId algo = new AlgorithmId(AlgorithmId.md5WithRSAEncryption_oid);
  info.set(X509CertInfo.ALGORITHM_ID, new CertificateAlgorithmId(algo));
 
  // Sign the cert to identify the algorithm that's used.
  X509CertImpl cert = new X509CertImpl(info);
  cert.sign(privkey, algorithm);
 
  // Update the algorith, and resign.
  algo = (AlgorithmId)cert.get(X509CertImpl.SIG_ALG);
  info.set(CertificateAlgorithmId.NAME + "." + CertificateAlgorithmId.ALGORITHM, algo);
  cert = new X509CertImpl(info);
  cert.sign(privkey, algorithm);
  return cert;
}   

签署证书的能力不是标准Java库或扩展的一部分。

自己实现这一点并不简单,但绝对是可行的——第一次为证书签名制作工作原型时,我可能花了整整4到5天的时间。这是一场灾难

import sun.security.x509.*;

import java.security.cert.*;
import java.security.*;
import java.math.BigInteger;
import java.security.cert.Certificate;
import java.util.Date;
import java.io.IOException;

public class Example {
    /**
     * Create a self-signed X.509 Example
     *
     * @param dn        the X.509 Distinguished Name, eg "CN=Test, L=London, C=GB"
     * @param pair      the KeyPair
     * @param days      how many days from now the Example is valid for
     * @param algorithm the signing algorithm, eg "SHA1withRSA"
     */
    public X509Certificate generateCertificate(String dn, KeyPair pair, int days, String algorithm)
            throws GeneralSecurityException, IOException {
        PrivateKey privkey = pair.getPrivate();
        X509CertInfo info = new X509CertInfo();
        Date from = new Date();
        Date to = new Date(from.getTime() + days * 86400000l);
        CertificateValidity interval = new CertificateValidity(from, to);
        BigInteger sn = new BigInteger(64, new SecureRandom());
        X500Name owner = new X500Name(dn);

        info.set(X509CertInfo.VALIDITY, interval);
        info.set(X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber(sn));
        info.set(X509CertInfo.SUBJECT, owner);
        info.set(X509CertInfo.ISSUER, owner);
        info.set(X509CertInfo.KEY, new CertificateX509Key(pair.getPublic()));
        info.set(X509CertInfo.VERSION, new CertificateVersion(CertificateVersion.V3));
        AlgorithmId algo = new AlgorithmId(AlgorithmId.md5WithRSAEncryption_oid);
        info.set(X509CertInfo.ALGORITHM_ID, new CertificateAlgorithmId(algo));

        // Sign the cert to identify the algorithm that's used.
        X509CertImpl cert = new X509CertImpl(info);
        cert.sign(privkey, algorithm);

        // Update the algorith, and resign.
        algo = (AlgorithmId) cert.get(X509CertImpl.SIG_ALG);
        info.set(CertificateAlgorithmId.NAME + "." + CertificateAlgorithmId.ALGORITHM, algo);
        cert = new X509CertImpl(info);
        cert.sign(privkey, algorithm);
        return cert;
    }

    public static void main (String[] argv) throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        Example example = new Example();
        String distinguishedName = "CN=Test, L=London, C=GB";
        Certificate certificate = example.generateCertificateOriginal(distinguishedName, keyPair, 365, "SHA256withRSA");
        System.out.println("it worked!");
    }
}

我喜欢vbence的答案,但我一直得到以下例外:

java.security.cert.CertificateException:主题类类型无效。

是 一个有效的主题类,我发现X509CerInfo需要一个X500Name的实例。

1 info.set(X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber(sn));
2 info.set(X509CertInfo.SUBJECT, new CertificateSubjectName(owner));
3 info.set(X509CertInfo.ISSUER, new CertificateIssuerName(owner));
4 info.set(X509CertInfo.KEY, new CertificateX509Key(pair.getPublic()));

因此,第2及;3需要更改为

2 info.set(X509CertInfo.SUBJECT, owner);
3 info.set(X509CertInfo.ISSUER, owner);

JRE中提供了生成自签名证书(签名、X509编码等)的所有基本组件。与BC不同,Sun的JCE不提供任何公共调用来签署证书。但是,所有功能都可以在Keytool中使用。您只需从keytool复制代码即可完成此操作。您需要复制的方法是 doSelfCert()

这取决于你到底想做什么(可能还取决于你对“理智”的定义)。正如ZZ Coder所指出的,您可以通过复制直接创建自签名证书 keytool . 但我不相信可以使用标准JCE创建PKCS10证书请求对象,如果想要创建标准的CA签名EEC,可能需要这样做。