使用CertificateFactory类 : CertificateFactory « 安全


import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.math.BigInteger;

import java.security.InvalidKeyException;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.NoSuchProviderException;

import java.security.SecureRandom;

import java.security.Security;

import java.security.SignatureException;

import java.security.cert.CertificateFactory;

import java.security.cert.X509Certificate;

import java.util.Date;



import javax.security.auth.x500.X500Principal;



import org.bouncycastle.x509.X509V1CertificateGenerator;



public class MainClass {

  public static void main(String[] args) throws Exception {

    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPair pair = generateRSAKeyPair();

    ByteArrayOutputStream bOut = new ByteArrayOutputStream();

    bOut.write(generateV1Certificate(pair).getEncoded());

    bOut.close();

    InputStream in = new ByteArrayInputStream(bOut.toByteArray());

    CertificateFactory fact = CertificateFactory.getInstance("X.509", "BC");

    X509Certificate x509Cert = (X509Certificate) fact.generateCertificate(in);

    System.out.println("issuer: " + x509Cert.getIssuerX500Principal());

  }



  public static X509Certificate generateV1Certificate(KeyPair pair) throws InvalidKeyException,

      NoSuchProviderException, SignatureException {

    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();



    certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis()));

    certGen.setIssuerDN(new X500Principal("CN=Test Certificate"));

    certGen.setNotBefore(new Date(System.currentTimeMillis() - 10000));

    certGen.setNotAfter(new Date(System.currentTimeMillis() + 10000));

    certGen.setSubjectDN(new X500Principal("CN=Test Certificate"));

    certGen.setPublicKey(pair.getPublic());

    certGen.setSignatureAlgorithm("SHA256WithRSAEncryption");



    return certGen.generateX509Certificate(pair.getPrivate(), "BC");

  }



  public static KeyPair generateRSAKeyPair() throws Exception {

    KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC");

    kpGen.initialize(1024, new SecureRandom());

    return kpGen.generateKeyPair();

  }

}
使用CertificateFactory类 : CertificateFactory « 安全 « Java 教程
