纯Java实现数字证书生成签名的简单实例

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();		}	}}