纯Java实现数字证书生成签名的简单实例

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 vkeyOid = new Vector();

vkeyOid.add(ekeyOid);

ExtendedKeyUsageExtension exKeyUsage = new ExtendedKeyUsageExtension(

vkeyOid);

CertificateExtensions exts = new CertificateExtensions();

exts.set("keyUsage", keyUsage)http://;

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 = iGaPFwTxinputKeyStore.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 phttp://wd,

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();

}

}

}

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