Java实现数字证书生成签名

package com.ylsoft.cert;  
  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.security.InvalidKeyException;  
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.Certificate;  
import java.security.cert.CertificateException;  
import java.security.cert.X509Certificate;  
import java.util.Date;  
import java.util.Vector;  
  
import sun.misc.BASE64Encoder;  
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.CertificateSerialNumber;  
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.X500Name;  
import sun.security.x509.X500Signer;  
import sun.security.x509.X509CertImpl;  
import sun.security.x509.X509CertInfo;  
  
/** 
 * 首先生成CA的根证书，然后有CA的根证书签署生成ScriptX的证书 
 *  
 * @author Administrator 
 *  
 */  
public class GenX509Cert {  
    /** 提供强加密随机数生成器 (RNG)* */  
    private SecureRandom sr;  
  
    public GenX509Cert() throws NoSuchAlgorithmException,  
            NoSuchProviderException {  
        // 返回实现指定随机数生成器 (RNG) 算法的 SecureRandom 对象。  
        sr = SecureRandom.getInstance("SHA1PRNG", "SUN");  
    }  
  
    public void createCert(X509Certificate certificate, PrivateKey rootPrivKey,  
            KeyPair kp) throws CertificateException, IOException,  
            InvalidKeyException, NoSuchAlgorithmException,  
            NoSuchProviderException, SignatureException {  
  
        // X.509 v1 证书的抽象类。此类提供了一种访问 X.509 v1 证书所有属性的标准方式。  
        byte certbytes[] = certificate.getEncoded();  
  
        // The X509CertImpl class represents an X.509 certificate.  
        X509CertImpl x509certimpl = new X509CertImpl(certbytes);  
  
        // The X509CertInfo class represents X.509 certificate information.  
        X509CertInfo x509certinfo = (X509CertInfo) x509certimpl  
                .get("x509.info");  
  
        // This class defines the X509Key attribute for the Certificate.  
        x509certinfo.set("key", new CertificateX509Key(kp.getPublic()));  
  
        // This class defines the Extensions attribute for the Certificate  
        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);  
  
        // Constructs a name from a conventionally formatted string, such as  
        // "CN=Dave, OU=JavaSoft, O=Sun Microsystems, C=US". (RFC 1779 or RFC  
        // 2253 style).  
        X500Name subject = new X500Name(  
                "CN=scriptx, OU=wps, O=wps, L=BJ, ST=BJ, C=CN");  
  
        x509certinfo.set("subject.dname", subject);  
  
        // 此 Signature 类用来为应用程序提供数字签名算法功能。返回实现指定签名算法的 Signature 对象。  
        Signature signature = Signature.getInstance("MD5WithRSA");  
  
        // 初始化这个用于签名的对象。如果使用其他参数再次调用此方法，此调用的结果将无效。  
        signature.initSign(kp.getPrivate());  
  
        // This class provides a binding between a Signature object and an  
        // authenticated X.500 name (from an X.509 certificate chain), which is  
        // needed in many public key signing applications.  
        X500Signer signer = new X500Signer(signature, issuer);  
  
        // This class identifies algorithms, such as cryptographic transforms,  
        // each of which may be associated with parameters.  
        AlgorithmId algorithmid = signer.getAlgorithmId();  
  
        // This class defines the AlgorithmId for the Certificate.  
        x509certinfo  
                .set("algorithmID", new CertificateAlgorithmId(algorithmid));  
  
        // 开始时间  
        Date bdate = new Date();  
  
        // 结束时间  
        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,This class defines the interval for which the  
        // certificate is valid.证书的有效时间  
        CertificateValidity certificatevalidity = new CertificateValidity(  
                bdate, edate);  
  
        x509certinfo.set("validity", certificatevalidity);  
  
        // This class defines the SerialNumber attribute for the Certificate.  
        // 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,This class defines the version of the X509 Certificate.  
        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("f:\\ScriptX.crt"));  
  
        base64.encodeBuffer(x509certimpl1.getEncoded(), fos);  
  
        try {  
            Certificate[] certChain = { x509certimpl1 };  
  
            savePfx("scriptx", kp.getPrivate(), "123456", certChain,  
                    "f:\\ScriptX.pfx");  
  
            FileInputStream in = new FileInputStream("F:\\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(  
                    "f:\\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);  
  
    }  
  
    /** 
     * 保存此根证书信息KeyStore Personal Information Exchange 
     *  
     * @param alias 
     * @param privKey 
     * @param pwd 
     * @param certChain 
     * @param filepath 
     * @throws Exception 
     */  
    public void savePfx(String alias, PrivateKey privKey, String pwd,  
            Certificate[] certChain, String filepath) throws Exception {  
        // 此类表示密钥和证书的存储设施。  
        // 返回指定类型的 keystore 对象。此方法从首选 Provider 开始遍历已注册安全提供者列表。返回一个封装 KeyStoreSpi  
        // 实现的新 KeyStore 对象，该实现取自第一个支持指定类型的 Provider。  
        KeyStore outputKeyStore = KeyStore.getInstance("pkcs12");  
  
        System.out.println("KeyStore类型：" + outputKeyStore.getType());  
  
        // 从给定输入流中加载此 KeyStore。可以给定一个密码来解锁 keystore（例如，驻留在硬件标记设备上的 keystore）或检验  
        // keystore 数据的完整性。如果没有指定用于完整性检验的密码，则不会执行完整性检验。如果要创建空  
        // keystore，或者不能从流中初始化 keystore，则传递 null 作为 stream 的参数。注意，如果此 keystore  
        // 已经被加载，那么它将被重新初始化，并再次从给定输入流中加载。  
        outputKeyStore.load(null, pwd.toCharArray());  
  
        // 将给定密钥（已经被保护）分配给给定别名。如果受保护密钥的类型为  
        // java.security.PrivateKey，则它必须附带证明相应公钥的证书链。如果底层 keystore 实现的类型为  
        // jks，则必须根据 PKCS #8 标准中的定义将 key 编码为  
        // EncryptedPrivateKeyInfo。如果给定别名已经存在，则与别名关联的 keystore  
        // 信息将被给定密钥（还可能包括证书链）重写。  
        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);  
  
        // 将此 keystore 存储到给定输出流，并用给定密码保护其完整性。  
        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();  
    }  
  
    /** 
     * 颁布根证书，自己作为CA 
     *  
     * @throws NoSuchAlgorithmException 
     * @throws NoSuchProviderException 
     * @throws InvalidKeyException 
     * @throws IOException 
     * @throws CertificateException 
     * @throws SignatureException 
     * @throws UnrecoverableKeyException 
     */  
    public void createRootCA() throws NoSuchAlgorithmException,  
            NoSuchProviderException, InvalidKeyException, IOException,  
            CertificateException, SignatureException, UnrecoverableKeyException {  
  
        // 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）  
        // Generate a pair of keys, and provide access to them.  
        CertAndKeyGen cak = new CertAndKeyGen("RSA", "MD5WithRSA", null);  
  
        // Sets the source of random numbers used when generating keys.  
        cak.setRandom(sr);  
  
        // Generates a random public/private key pair, with a given key size.  
        cak.generate(1024);  
  
        // Constructs a name from a conventionally formatted string, such as  
        // "CN=Dave, OU=JavaSoft, O=Sun Microsystems, C=US". (RFC 1779 or RFC  
        // 2253 style)  
        X500Name subject = new X500Name(  
                "CN=RootCA,OU=hackwp,O=wp,L=BJ,S=BJ,C=CN");  
  
        // Returns a self-signed X.509v3 certificate for the public key. The  
        // certificate is immediately valid. No extensions.  
        // Such certificates normally are used to identify a "Certificate  
        // Authority" (CA). Accordingly, they will not always be accepted by  
        // other parties. However, such certificates are also useful when you  
        // are bootstrapping your security infrastructure, or deploying system  
        // prototypes.自签名的根证书  
        X509Certificate certificate = cak.getSelfCertificate(subject,  
                new Date(), 3650 * 24L * 60L * 60L);  
  
        X509Certificate[] certs = { certificate };  
  
        try {  
  
            savePfx("RootCA", cak.getPrivateKey(), "123456", certs,  
                    "f:\\RootCa.pfx");  
  
        } catch (Exception e) {  
  
            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("f:\\RootCa.crt"));  
  
        // fos.write(certificate.getEncoded());  
  
        // 生成（保存）cert文件 base64加密 当然也可以不加密  
        base64.encodeBuffer(certificate.getEncoded(), fos);  
  
        fos.close();  
  
    }  
  
    public void signCert() throws NoSuchAlgorithmException,  
            CertificateException, IOException, UnrecoverableKeyException,  
            InvalidKeyException, NoSuchProviderException, SignatureException {  
  
        try {  
  
            KeyStore ks = KeyStore.getInstance("pkcs12");  
  
            FileInputStream ksfis = new FileInputStream("f:\\RootCa.pfx");  
  
            char[] storePwd = "123456".toCharArray();  
  
            char[] keyPwd = "123456".toCharArray();  
  
            // 从给定输入流中加载此 KeyStore。  
            ks.load(ksfis, storePwd);  
  
            ksfis.close();  
  
            // 返回与给定别名关联的密钥(私钥)，并用给定密码来恢复它。必须已经通过调用 setKeyEntry，或者以  
            // PrivateKeyEntry  
            // 或 SecretKeyEntry 为参数的 setEntry 关联密钥与别名。  
            PrivateKey privK = (PrivateKey) ks.getKey("RootCA", keyPwd);  
  
            // 返回与给定别名关联的证书。如果给定的别名标识通过调用 setCertificateEntry 创建的条目，或者通过调用以  
            // TrustedCertificateEntry 为参数的 setEntry  
            // 创建的条目，则返回包含在该条目中的可信证书。如果给定的别名标识通过调用 setKeyEntry 创建的条目，或者通过调用以  
            // PrivateKeyEntry 为参数的 setEntry 创建的条目，则返回该条目中证书链的第一个元素。  
            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();  
        }  
    }  
}