项目中用到的数字证书的创建，签名实现

首先 需要下载jar包 bcprov-jdk15-145.jar 

 实体类

package com.hongan.lh.cert;

import java.security.KeyPair;
import java.security.cert.X509Certificate;

public class CertInfo {
 private KeyPair key;
 private X509Certificate cert;
 public KeyPair getKey() {
  return key;
 }
 public void setKey(KeyPair key) {
  this.key = key;
 }
 public X509Certificate getCert() {
  return cert;
 }
 public void setCert(X509Certificate cert) {
  this.cert = cert;
 }
}

帮助类

package com.hongan.lh.cert;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.bouncycastle.openssl.PEMReader;
import org.bouncycastle.openssl.PEMWriter;
import org.bouncycastle.openssl.PasswordFinder;

public class HongAnUtils {
 public static KeyPair getPrivateKey(String rootMiyuePath,
   final String rootMiyuePwd) throws Exception {
  PEMReader reader = new PEMReader(new InputStreamReader(
    new FileInputStream(rootMiyuePath)), new PasswordFinder() {

   public char[] getPassword() {
    // TODO Auto-generated method stub
    return rootMiyuePwd.toCharArray();
   }

  });
  KeyPair key = (KeyPair) reader.readObject();
  return key;
 }

 public static void saveX509Certificate(X509Certificate certificate,
   String rootcertPath) throws Exception {
  FileOutputStream stream = new FileOutputStream(rootcertPath);
  stream.write(certificate.getEncoded());
  stream.close();
 }

 public static void savePEM(PrivateKey key, String rootMiyuePwd,
   String rootMiyuePath) throws Exception {
  PEMWriter writer = new PEMWriter(new FileWriter(rootMiyuePath));
  writer.writeObject(key, "DESEDE", rootMiyuePwd.toCharArray(),
    new SecureRandom());
  writer.close();
 }

 public static KeyPair generateRSAKeyPair() throws Exception {
  KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA");

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

  return kpGen.generateKeyPair();
 }

 public static byte[] RSASign(PrivateKey key, byte[] src) throws Exception {

  java.security.Signature sign = java.security.Signature.getInstance(
    "SHA1withRSA", "BC");
  sign.initSign(key);
  sign.update(src);
  return sign.sign();
 }

 public static boolean RSAVerifySign(PublicKey key, byte[] crypt, byte[] src)
   throws Exception {

  java.security.Signature sign = java.security.Signature.getInstance(
    "SHA1withRSA", "BC");
  sign.initVerify(key);
  sign.update(src);
  return sign.verify(crypt);
 }

 public static X509Certificate getCertificate(String rootCertPath)
   throws Exception {
  CertificateFactory factory = CertificateFactory.getInstance("X.509");
  FileInputStream inputStream = new FileInputStream(rootCertPath);
  X509Certificate certificate = (X509Certificate) factory
    .generateCertificate(inputStream);
  return certificate;
 }

 public static void write(String file, byte[] data) throws Exception {
  FileOutputStream outputStream = new FileOutputStream(file);
  outputStream.write(data);
  outputStream.close();
 }

 public static byte[] read(String file) throws Exception {
  FileInputStream stream = new FileInputStream(file);
  byte[] by = new byte[stream.available()];
  stream.read(by);
  stream.close();
  return by;
 }

 public static byte[] encrypt(Key key, byte[] b, String suan)
   throws Exception {
  Cipher newcipher = Cipher.getInstance(suan);
  newcipher.init(Cipher.ENCRYPT_MODE, key);
  return newcipher.doFinal(b);
 }

 public static byte[] encryptByKouling(byte[] s, String suan, String kou)
   throws Exception {
  PBEKeySpec spec = new PBEKeySpec(kou.toCharArray());
  SecretKeyFactory factory = SecretKeyFactory.getInstance(suan);
  SecretKey key = factory.generateSecret(spec);
  Cipher cipher = Cipher.getInstance(suan);
  PBEParameterSpec pps = new PBEParameterSpec(new byte[] { 0xF, 0x0, 0x1,
    0x2, 0x3, 0x4, 0x5, 0x6 }, 1);
  cipher.init(Cipher.ENCRYPT_MODE, key, pps);
  byte[] debyte = cipher.doFinal(s);
  return debyte;
 }

 public static byte[] decryptByKouling(byte[] s, String suan, String kou)
   throws Exception {
  PBEKeySpec spec = new PBEKeySpec(kou.toCharArray());
  SecretKeyFactory factory = SecretKeyFactory.getInstance(suan);
  SecretKey key = factory.generateSecret(spec);
  Cipher cipher = Cipher.getInstance(suan);
  PBEParameterSpec pps = new PBEParameterSpec(new byte[] { 0xF, 0x0, 0x1,
    0x2, 0x3, 0x4, 0x5, 0x6 }, 1);
  cipher.init(Cipher.DECRYPT_MODE, key, pps);
  byte[] debyte = cipher.doFinal(s);
  return debyte;
 }
}

证书操作类

package com.hongan.lh.cert;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Date;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.x509.X509V1CertificateGenerator;

import sun.security.x509.X509CertImpl;
import sun.security.x509.X509CertInfo;

public class HongAnCA {

 /**
  * @param args
  * @throws Exception
  */
 public static void main(String[] args) throws Exception {

  // CreateRootCert("中国|广东省|深圳市|公司A|3650|1000000000000001|HARootPwd|c://ca//HARoot.pem|c://ca//HARoot.cer");
  // BackupRootCert("c://ca//honganbackup.p12|p12pass|c://ca//HARoot.pem|HARootPwd|c://ca//HARoot.cer");
  // RestoreRootCert("c://ca//honganbackup.p12|p12pass|c://ca//honganroot_restore.pem|privkeypass|c://ca//honganroot_restore.cer");
  // CreateUserCert("中国|广东省|深圳市|一家|廖敏|111@163.com|3333333|365|1000000000000002|c://ca//廖敏.pem|user1pass|c://ca//廖敏.cer|c://ca//HARoot.pem|HARootPwd|c://ca//HARoot.cer");
  // ExportCompanyKeyByUserCert("c://ca//companykey.dat|keypassword|c://ca//廖敏.cer|c://ca//廖敏.dat");
  // CreateCompanyKey("ABCDEFGHIJKLMNOPQRSTUVWXYZ123456|c://ca//companykey.dat|keypassword");
  // ExportCompanyKeyByUserCert("c://ca//companykey.dat|keypassword|c://ca//廖敏.cer|c://ca//廖敏.dat");

 }

 public static byte[] CreateRootCert(String certInfo) throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String[] splt = certInfo.split("//|");
  String country = splt[0];
  String provice = splt[1];
  String shi = splt[2];
  String company = splt[3];
  String validateTime = splt[4];
  String seriszeString = splt[5];
  String rootMiyuePwd = splt[6];
  String rootMiyuePath = splt[7];
  String rootcertPath = splt[8];
  String certSubject = "C=" + country + ",S=" + provice + ",L=" + shi
    + ",O=" + company + ",CN=" + company;
  KeyPair pair = HongAnUtils.generateRSAKeyPair();
  X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
  certGen.setSerialNumber(new BigInteger(seriszeString));
  certGen.setNotBefore(new Date(System.currentTimeMillis()));
  certGen.setNotAfter(new Date(System.currentTimeMillis()
    + Long.parseLong(validateTime) * 24 * 60 * 60 * 1000L));
  certGen.setSubjectDN(new X500Principal(certSubject));
  certGen.setPublicKey(pair.getPublic());
  certGen.setIssuerDN(new X500Principal(certSubject));
  certGen.setSignatureAlgorithm("SHA1WithRSA");
  X509Certificate certificate = certGen.generate(pair.getPrivate());
  HongAnUtils.saveX509Certificate(certificate, rootcertPath);
  HongAnUtils.savePEM(pair.getPrivate(), rootMiyuePwd, rootMiyuePath);
  return certificate.getEncoded();

 }

 public static void BackupRootCert(String certInfo) throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String[] splt = certInfo.split("//|");
  String backPath = splt[0];
  String backPwd = splt[1];
  String rootMiyuePath = splt[2];
  final String rootMiyuePwd = splt[3];
  String rootCertPath = splt[4];
  CertificateFactory factory = CertificateFactory.getInstance("X.509");
  FileInputStream inputStream = new FileInputStream(rootCertPath);
  X509Certificate certificate = (X509Certificate) factory
    .generateCertificate(inputStream);
  KeyPair key = HongAnUtils.getPrivateKey(rootMiyuePath, rootMiyuePwd);
  Certificate[] chain = new Certificate[1];
  chain[0] = certificate;
  KeyStore store = KeyStore.getInstance("PKCS12", "BC");
  store.load(null, null);
  store.setCertificateEntry("root", certificate);
  store.setKeyEntry("rootPriKey", key.getPrivate(), null, chain);
  store.store(new FileOutputStream(backPath), backPwd.toCharArray());
 }

 public static void RestoreRootCert(String certInfo) throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String[] splt = certInfo.split("//|");
  String bakpath = splt[0];
  String bakpwd = splt[1];
  String yuanpem = splt[2];
  String pempwd = splt[3];
  String certPath = splt[4];
  InputStream stream = new FileInputStream(bakpath);
  KeyStore store = KeyStore.getInstance("PKCS12", "BC");
  store.load(stream, bakpwd.toCharArray());
  X509Certificate certificate = (X509Certificate) store
    .getCertificate("root");
  PrivateKey key = (PrivateKey) store.getKey("rootPriKey", null);
  HongAnUtils.saveX509Certificate(certificate, certPath);
  HongAnUtils.savePEM(key, pempwd, yuanpem);
 }

 // ca.CreateUserCert("中国|广东省|深圳市|一家|廖敏|111@163.com|3333333|365|1000000000000002|c://ca//廖敏.pem|user1pass|c://ca//于泳涛.cer|c://ca//HARoot.pem|HARootPwd|c://ca//HARoot.cer");
 public static CertInfo CreateUserCert(String certInfo) throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String[] splt = certInfo.split("//|");
  String country = splt[0];
  String provice = splt[1];
  String shi = splt[2];
  String company = splt[3];
  String userName = splt[4];
  String email = splt[5];
  String cellphone = splt[6];

  String validateTime = splt[7];
  String seriszeString = splt[8];
  String userpemPath = splt[9];
  String userpemPwd = splt[10];
  String usercertpath = splt[11];
  String rootpempath = splt[12];
  String rootpempwd = splt[13];
  String rootcertpath = splt[14];
  X509Certificate CA = HongAnUtils.getCertificate(rootcertpath);
  String certSubject = "C=" + country + ",S=" + provice + ",L=" + shi
    + ",O=" + company + ",Email=" + email
    + ",0.9.2342.19200300.100.1.41 = " + cellphone + ",CN="
    + userName;
  KeyPair pair = HongAnUtils.generateRSAKeyPair();
  X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
  certGen.setSerialNumber(new BigInteger(seriszeString));
  certGen.setNotBefore(new Date(System.currentTimeMillis()));
  certGen.setNotAfter(new Date(System.currentTimeMillis()
    + Long.parseLong(validateTime) * 24 * 60 * 60 * 1000L));
  certGen.setSubjectDN(new X500Principal(certSubject));
  certGen.setPublicKey(pair.getPublic());
  certGen.setIssuerDN(CA.getIssuerX500Principal());
  certGen.setSignatureAlgorithm("SHA1WithRSA");

  X509Certificate certificate = certGen.generate(pair.getPrivate());
  byte[] src = certificate.getEncoded();
  KeyPair key = HongAnUtils.getPrivateKey(rootpempath, rootpempwd);
  // byte[] b = HongAnUtils.RSASign(key.getPrivate(), src);
  X509CertImpl newcert = new X509CertImpl(src);
  X509CertInfo info = (X509CertInfo) newcert.get(newcert.getName() + "."
    + newcert.INFO);
  X509CertImpl export = new X509CertImpl(info);
  export.sign(key.getPrivate(), "SHA1WithRSA");

  HongAnUtils.savePEM(pair.getPrivate(), userpemPwd, userpemPath);
  DEROutputStream stream = new DEROutputStream(new FileOutputStream(
    usercertpath));
  stream.write(export.getEncoded());
  stream.close();
  CertInfo cert = new CertInfo();
  cert.setCert(certificate);
  cert.setKey(pair);
  return cert;
 }

 // 将字符串生成密钥文件利用密码保护
 // ("ABCDEFGHIJKLMNOPQRSTUVWXYZ123456|c://ca//companykey.dat|keypassword");
 public static void CreateCompanyKey(String strArgs) throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String pwd = strArgs.split("//|")[0];
  String savePathString = strArgs.split("//|")[1];
  String baoPwd = strArgs.split("//|")[2];
  char[] kouling = baoPwd.toCharArray();
  PBEKeySpec spec = new PBEKeySpec(kouling);
  SecretKeyFactory factory = SecretKeyFactory
    .getInstance("PBEWithMD5AndDES");
  SecretKey seKey = factory.generateSecret(spec);
  Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
  PBEParameterSpec pps = new PBEParameterSpec(new byte[] { 0xF, 0x0, 0x1,
    0x2, 0x3, 0x4, 0x5, 0x6 }, 1);
  cipher.init(Cipher.ENCRYPT_MODE, seKey, pps);
  byte[] enbyte = cipher.doFinal(pwd.getBytes("utf-8"));
  FileOutputStream stream = new FileOutputStream(savePathString);
  stream.write(enbyte);
  stream.close();

 }

 // 利用用户证书的公钥 给公司密钥加密生成用户密钥
 // c://ca//companykey.dat|keypassword|c://ca//廖敏.cer|c://ca//廖敏.dat");
 public static void ExportCompanyKeyByUserCert(String strArgs)
   throws Exception {
  Security.addProvider(new BouncyCastleProvider());
  String[] splt = strArgs.split("//|");
  String mimaPath = splt[0];
  String mima = splt[1];
  String rootCertPath = splt[2];
  String usermimapath = splt[3];
  FileInputStream input = new FileInputStream(mimaPath);
  byte[] enbyte = new byte[input.available()];
  input.read(enbyte);
  input.close();
  PBEKeySpec spec = new PBEKeySpec(mima.toCharArray());
  SecretKeyFactory factory = SecretKeyFactory
    .getInstance("PBEWithMD5AndDES");
  SecretKey key = factory.generateSecret(spec);
  Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
  PBEParameterSpec pps = new PBEParameterSpec(new byte[] { 0xF, 0x0, 0x1,
    0x2, 0x3, 0x4, 0x5, 0x6 }, 1);
  cipher.init(Cipher.DECRYPT_MODE, key, pps);
  byte[] debyte = cipher.doFinal(enbyte);
  PublicKey pk = (PublicKey) HongAnUtils.getCertificate(rootCertPath)
    .getPublicKey();
  byte[] enbyteagain = HongAnUtils.encrypt(pk, debyte, "RSA");
  HongAnUtils.write(usermimapath, enbyteagain);
 }
}