java 代码生成签发数字证书

from  http://blog.csdn.net/cr266/article/details/6985682?locationNum=2

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.cert.Certificate;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;
import java.util.Vector;


import com.sun.xml.internal.stream.Entity;


import sun.misc.BASE64Encoder;
import sun.security.provider.certpath.X509CertificatePair;
import sun.security.util.ObjectIdentifier;
import sun.security.x509.AlgorithmId;
import sun.security.x509.CertAndKeyGen;
import sun.security.x509.CertificateAlgorithmId;
import sun.security.x509.CertificateExtensions;
import sun.security.x509.CertificateIssuerUniqueIdentity;
import sun.security.x509.CertificateSerialNumber;
import sun.security.x509.CertificateSubjectName;
import sun.security.x509.CertificateValidity;
import sun.security.x509.CertificateVersion;
import sun.security.x509.CertificateX509Key;
import sun.security.x509.ExtendedKeyUsageExtension;
import sun.security.x509.Extension;
import sun.security.x509.KeyIdentifier;
import sun.security.x509.KeyUsageExtension;
import sun.security.x509.SubjectKeyIdentifierExtension;
import sun.security.x509.UniqueIdentity;
import sun.security.x509.X500Name;
import sun.security.x509.X500Signer;
import sun.security.x509.X509CertImpl;
import sun.security.x509.X509CertInfo;


public class GenX509Cert {
private SecureRandom sr=new SecureRandom();

public GenX509Cert() throws NoSuchAlgorithmException, NoSuchProviderException{
sr=SecureRandom.getInstance("SHA1PRNG", "SUN");
}

public void  createCert(X509Certificate certificate,PrivateKey rootPrivKey,KeyPair kp) throws CertificateException, IOException, InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, SignatureException{
byte certbytes[] = certificate.getEncoded();
X509CertImpl x509certimpl = new X509CertImpl(certbytes);

X509CertInfo x509certinfo = (X509CertInfo)x509certimpl.get("x509.info");

x509certinfo.set("key", new CertificateX509Key(kp.getPublic()));

CertificateExtensions certificateextensions = new CertificateExtensions();
        certificateextensions.set("SubjectKeyIdentifier", new SubjectKeyIdentifierExtension((new KeyIdentifier(kp.getPublic())).getIdentifier()));
        x509certinfo.set("extensions", certificateextensions);

        //设置issuer域
X500Name issuer = new X500Name("CN=RootCA,OU=hackwp,O=wp,L=BJ,S=BJ,C=CN");
x509certinfo.set("issuer.dname",issuer);
X500Name subject = new X500Name("CN=scriptx, OU=wps, O=wps, L=BJ, ST=BJ, C=CN");
x509certinfo.set("subject.dname",subject);

Signature signature = Signature.getInstance("MD5WithRSA");
signature.initSign(kp.getPrivate()); 
X500Signer signer=new X500Signer(signature,issuer);

AlgorithmId algorithmid = signer.getAlgorithmId();
x509certinfo.set("algorithmID", new CertificateAlgorithmId(algorithmid));

Date bdate = new Date();
Date edate = new Date();
//天  小时 分 秒 毫秒
edate.setTime(bdate.getTime() + 3650 * 24L * 60L * 60L * 1000L);
//validity为有效时间长度 单位为秒
CertificateValidity certificatevalidity = new CertificateValidity(bdate, edate);
x509certinfo.set("validity", certificatevalidity);
//设置有效期域（包含开始时间和到期时间）域名等同与x509certinfo.VALIDITY
x509certinfo.set("serialNumber", new CertificateSerialNumber((int)(new Date().getTime() / 1000L)));
//设置序列号域
CertificateVersion cv = new CertificateVersion(CertificateVersion.V3);
x509certinfo.set(X509CertInfo.VERSION,cv);
//设置版本号 只有v1 ,v2,v3这几个合法值
/**
*以上是证书的基本信息 如果要添加用户扩展信息 则比较麻烦 首先要确定version必须是v3否则不行 然后按照以下步骤
**/
ObjectIdentifier oid = new ObjectIdentifier(new int[]{2,5,29,15});
//生成扩展域的id 是个int数组 第1位最大2 第2位最大39 最多可以几位不明....
String userData = "Digital Signature, Non-Repudiation, Key Encipherment, Data Encipherment (f0)";

byte l = (byte)userData.length();//数据总长17位
byte f = 0x04;
byte[] bs = new byte[userData.length()+2];
bs[0] = f;
bs[1] = l;
for(int i=2;i<bs.length;i++)
{
 bs[i] = (byte)userData.charAt(i-2);
}
Extension ext = new Extension(oid,true,bs);
// 生成一个extension对象 参数分别为 oid，是否关键扩展，byte[]型的内容值
//其中内容的格式比较怪异 第一位是flag 这里取4暂时没出错 估计用来说明数据的用处的 第2位是后面的实际数据的长度，然后就是数据
//密钥用法
KeyUsageExtension keyUsage=new KeyUsageExtension();
keyUsage.set(KeyUsageExtension.DIGITAL_SIGNATURE, true);
keyUsage.set(KeyUsageExtension.NON_REPUDIATION, true);
keyUsage.set(KeyUsageExtension.KEY_ENCIPHERMENT, true);
keyUsage.set(KeyUsageExtension.DATA_ENCIPHERMENT, true);

//增强密钥用法
ObjectIdentifier ekeyOid = new ObjectIdentifier(new int[]{1, 3, 6, 1, 5, 5, 7, 3, 3});
Vector<ObjectIdentifier> vkeyOid=new Vector<ObjectIdentifier>();
vkeyOid.add(ekeyOid);
ExtendedKeyUsageExtension exKeyUsage=new ExtendedKeyUsageExtension(vkeyOid);

CertificateExtensions exts = new CertificateExtensions();

exts.set("keyUsage",keyUsage);
exts.set("extendedKeyUsage",exKeyUsage);

//如果有多个extension则都放入CertificateExtensions 类中，
x509certinfo.set(X509CertInfo.EXTENSIONS,exts);
//设置extensions域


X509CertImpl x509certimpl1 = new X509CertImpl(x509certinfo);
x509certimpl1.sign(rootPrivKey, "MD5WithRSA");
//使用另一个证书的私钥来签名此证书 这里使用 md5散列 用rsa来加密


BASE64Encoder base64 = new BASE64Encoder();
FileOutputStream fos = new FileOutputStream(new File("e:\\ScriptX.crt"));
base64.encodeBuffer(x509certimpl1.getEncoded(), fos);

try {
Certificate[] certChain={x509certimpl1};
savePfx("scriptx",kp.getPrivate(),"123456", certChain,"e:\\ScriptX.pfx");

FileInputStream in = new FileInputStream("e:\\ScriptX.pfx");
KeyStore inputKeyStore = KeyStore.getInstance("pkcs12");
inputKeyStore.load(in, "123456".toCharArray());

Certificate cert=inputKeyStore.getCertificate("scriptx");
System.out.print(cert.getPublicKey());

PrivateKey privk=(PrivateKey)inputKeyStore.getKey("scriptx", "123456".toCharArray());

FileOutputStream privKfos = new FileOutputStream(new File("e:\\ScriptX.pvk"));

privKfos.write(privk.getEncoded());
System.out.print(privk);
//base64.encode(key.getEncoded(), privKfos);

in.close();

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//生成文件
x509certimpl1.verify(certificate.getPublicKey(),null);


}

public void savePfx(String alias,PrivateKey privKey,String pwd,Certificate[] certChain,String filepath) throws Exception{
KeyStore outputKeyStore = KeyStore.getInstance("pkcs12");
System.out.println(outputKeyStore.getType());
outputKeyStore.load(null, pwd.toCharArray());
outputKeyStore.setKeyEntry(alias,privKey , pwd.toCharArray(), certChain);
//KeyStore.PrivateKeyEntry pke=new KeyStore.PrivateKeyEntry(kp.getPrivate(),certChain);
//KeyStore.PasswordProtection password=new KeyStore.PasswordProtection("123456".toCharArray());
//outputKeyStore.setEntry("scriptx", pke, password);

FileOutputStream out = new FileOutputStream(filepath);
outputKeyStore.store(out, pwd.toCharArray());
out.close();
}

public void saveJks(String alias,PrivateKey privKey,String pwd,Certificate[] certChain,String filepath) throws Exception{
KeyStore outputKeyStore = KeyStore.getInstance("jks");
System.out.println(outputKeyStore.getType());
outputKeyStore.load(null, pwd.toCharArray());
outputKeyStore.setKeyEntry(alias,privKey , pwd.toCharArray(), certChain);
//KeyStore.PrivateKeyEntry pke=new KeyStore.PrivateKeyEntry(kp.getPrivate(),certChain);
//KeyStore.PasswordProtection password=new KeyStore.PasswordProtection("123456".toCharArray());
//outputKeyStore.setEntry("scriptx", pke, password);

FileOutputStream out = new FileOutputStream(filepath);
outputKeyStore.store(out, pwd.toCharArray());
out.close();
}

public void createRootCA() throws NoSuchAlgorithmException, NoSuchProviderException, InvalidKeyException, IOException, CertificateException, SignatureException, UnrecoverableKeyException{
CertAndKeyGen cak = new CertAndKeyGen("RSA","MD5WithRSA",null);
//参数分别为 公钥算法 签名算法 providername（因为不知道确切的 只好使用null 既使用默认的provider）
cak.generate(1024);
cak.setRandom(sr);
//生成一对key 参数为key的长度 对于rsa不能小于512
X500Name subject = new X500Name("CN=RootCA,OU=hackwp,O=wp,L=BJ,S=BJ,C=CN");
//subject name
X509Certificate certificate = cak.getSelfCertificate(subject,new Date(),3650 * 24L * 60L * 60L);

X509Certificate [] certs={certificate};

try {
savePfx("RootCA",cak.getPrivateKey(),"123456",certs,"e:\\RootCa.pfx");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

// 后一个long型参数代表从现在开始的有效期 单位为秒（如果不想从现在开始算 可以在后面改这个域） 
BASE64Encoder base64 = new BASE64Encoder();
FileOutputStream fos = new FileOutputStream(new File("e:\\RootCa.crt"));
base64.encodeBuffer(certificate.getEncoded(), fos);
//生成cert文件 base64加密 当然也可以不加密
}

public void signCert() throws NoSuchAlgorithmException, CertificateException, IOException, UnrecoverableKeyException, InvalidKeyException, NoSuchProviderException, SignatureException{
try {
KeyStore ks = KeyStore.getInstance("pkcs12");

FileInputStream ksfis = new FileInputStream("e:\\RootCa.pfx");
char[] storePwd = "123456".toCharArray();
char[] keyPwd = "123456".toCharArray();

ks.load(ksfis, storePwd);
ksfis.close();
//从密钥仓库得到私钥
PrivateKey privK = (PrivateKey) ks.getKey("RootCA", keyPwd);

X509Certificate certificate=(X509Certificate) ks.getCertificate("RootCA");

createCert(certificate,privK,genKey());



} catch (KeyStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public KeyPair genKey() throws NoSuchAlgorithmException{
KeyPairGenerator kpg=KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024,sr);
System.out.print(kpg.getAlgorithm());
KeyPair kp=kpg.generateKeyPair();

return kp;
}

public static void main(String [] args){
try {
GenX509Cert gcert=new GenX509Cert();
gcert.createRootCA();
gcert.signCert();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}