在构建Java代码实现前，我们需要完成证书的制作。
1.生成keyStroe文件
在命令行下执行以下命令：
keytool -genkey -validity 36000 -alias lee -keyalg RSA -keystore d:\lee.keystore
其中
-genkey 表示生成密钥输入密钥库口令:
再次输入新口令:
您的名字与姓氏是什么?
[Unknown]: lee
您的组织单位名称是什么?
[Unknown]: lee
您的组织名称是什么?
[Unknown]: ruiqi
您所在的城市或区域名称是什么?
[Unknown]: ruiqi
您所在的省/市/自治区名称是什么?
[Unknown]: taiyuan
该单位的双字母国家/地区代码是什么?
[Unknown]: CN
CN=lee, OU=lee, O=ruiqi, L=ruiqi, ST=taiyuan, C=CN是否正确?
[否]: Y
输入 <lee> 的密钥口令
(如果和密钥库口令相同, 按回车):
keytool -export -keystore d:\lee.keystore -alias lee -file d:\lee.cer -rfc其中
输入keystore密码： 保存在文件中的认证 <d:\lee.cer>当然，使用方是需要导入证书的！
Ok，准备工作完成，开始Java实现！
package com.lee.encrypt;
import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Date;
import javax.crypto.Cipher;
/**
* 证书组件
*
*/
public abstract class CertificateCoder extends Coder {
/**
* Java密钥库(Java Key Store，JKS)KEY_STORE
*/
public static final String KEY_STORE = "JKS";
public static final String X509 = "X.509";
/**
* 由KeyStore获得私钥
*
* @param keyStorePath
* @param alias
* @param password
* @return
* @throws Exception
*/
private static PrivateKey getPrivateKey(String keyStorePath, String alias,
String password) throws Exception {
KeyStore ks = getKeyStore(keyStorePath, password);
PrivateKey key = (PrivateKey) ks.getKey(alias, password.toCharArray());
return key;
}
/**
* 由Certificate获得公钥
*
* @param certificatePath
* @return
* @throws Exception
*/
private static PublicKey getPublicKey(String certificatePath)
throws Exception {
Certificate certificate = getCertificate(certificatePath);
PublicKey key = certificate.getPublicKey();
return key;
}
/**
* 获得Certificate
*
* @param certificatePath
* @return
* @throws Exception
*/
private static Certificate getCertificate(String certificatePath)
throws Exception {
CertificateFactory certificateFactory = CertificateFactory
.getInstance(X509);
FileInputStream in = new FileInputStream(certificatePath);
Certificate certificate = certificateFactory.generateCertificate(in);
in.close();
return certificate;
}
/**
* 获得Certificate
*
* @param keyStorePath
* @param alias
* @param password
* @return
* @throws Exception
*/
private static Certificate getCertificate(String keyStorePath,
String alias, String password) throws Exception {
KeyStore ks = getKeyStore(keyStorePath, password);
Certificate certificate = ks.getCertificate(alias);
return certificate;
}
/**
* 获得KeyStore
*
* @param keyStorePath
* @param password
* @return
* @throws Exception
*/
private static KeyStore getKeyStore(String keyStorePath, String password)
throws Exception {
FileInputStream is = new FileInputStream(keyStorePath);
KeyStore ks = KeyStore.getInstance(KEY_STORE);
ks.load(is, password.toCharArray());
is.close();
return ks;
}
/**
* 私钥加密
*
* @param data
* @param keyStorePath
* @param alias
* @param password
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String keyStorePath,
String alias, String password) throws Exception {
// 取得私钥
PrivateKey privateKey = getPrivateKey(keyStorePath, alias, password);
// 对数据加密
Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 私钥解密
*
* @param data
* @param keyStorePath
* @param alias
* @param password
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] data, String keyStorePath,
String alias, String password) throws Exception {
// 取得私钥
PrivateKey privateKey = getPrivateKey(keyStorePath, alias, password);
// 对数据加密
Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 公钥加密
*
* @param data
* @param certificatePath
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String certificatePath)
throws Exception {
// 取得公钥
PublicKey publicKey = getPublicKey(certificatePath);
// 对数据加密
Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* 公钥解密
*
* @param data
* @param certificatePath
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] data, String certificatePath)
throws Exception {
// 取得公钥
PublicKey publicKey = getPublicKey(certificatePath);
// 对数据加密
Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* 验证Certificate
*
* @param certificatePath
* @return
*/
public static boolean verifyCertificate(String certificatePath) {
return verifyCertificate(new Date(), certificatePath);
}
/**
* 验证Certificate是否过期或无效
*
* @param date
* @param certificatePath
* @return
*/
public static boolean verifyCertificate(Date date, String certificatePath) {
boolean status = true;
try {
// 取得证书
Certificate certificate = getCertificate(certificatePath);
// 验证证书是否过期或无效
status = verifyCertificate(date, certificate);
} catch (Exception e) {
status = false;
}
return status;
}
/**
* 验证证书是否过期或无效
*
* @param date
* @param certificate
* @return
*/
private static boolean verifyCertificate(Date date, Certificate certificate) {
boolean status = true;
try {
X509Certificate x509Certificate = (X509Certificate) certificate;
x509Certificate.checkValidity(date);
} catch (Exception e) {
status = false;
}
return status;
}
/**
* 签名
*
* @param keyStorePath
* @param alias
* @param password
*
* @return
* @throws Exception
*/
public static String sign(byte[] sign, String keyStorePath, String alias,
String password) throws Exception {
// 获得证书
X509Certificate x509Certificate = (X509Certificate) getCertificate(
keyStorePath, alias, password);
// 获取私钥
KeyStore ks = getKeyStore(keyStorePath, password);
// 取得私钥
PrivateKey privateKey = (PrivateKey) ks.getKey(alias, password
.toCharArray());
// 构建签名
Signature signature = Signature.getInstance(x509Certificate
.getSigAlgName());
signature.initSign(privateKey);
signature.update(sign);
return encryptBASE64(signature.sign());
}
/**
* 验证签名
*
* @param data
* @param sign
* @param certificatePath
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String sign,
String certificatePath) throws Exception {
// 获得证书
X509Certificate x509Certificate = (X509Certificate) getCertificate(certificatePath);
// 获得公钥
PublicKey publicKey = x509Certificate.getPublicKey();
// 构建签名
Signature signature = Signature.getInstance(x509Certificate
.getSigAlgName());
signature.initVerify(publicKey);
signature.update(data);
return signature.verify(decryptBASE64(sign));
}
/**
* 验证Certificate
*
* @param keyStorePath
* @param alias
* @param password
* @return
*/
public static boolean verifyCertificate(Date date, String keyStorePath,
String alias, String password) {
boolean status = true;
try {
Certificate certificate = getCertificate(keyStorePath, alias,
password);
status = verifyCertificate(date, certificate);
} catch (Exception e) {
status = false;
}
return status;
}
/**
* 验证Certificate
*
* @param keyStorePath
* @param alias
* @param password
* @return
*/
public static boolean verifyCertificate(String keyStorePath, String alias,
String password) {
return verifyCertificate(new Date(), keyStorePath, alias, password);
}
}
再给出一个测试类：
/*
* 文 件 名: CertificateCoderTest.java
* 版 权: 此文件版权归山西锐祺科技有限公司所有
* 描 述: <描述>
* 修 改 人: Administrator
* 修改时间: 2014年4月30日
*/
package com.lee.encrypt;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.DataInputStream;
import java.io.File;
import java.io.InputStream;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import org.apache.commons.io.FileUtils;
import org.junit.Ignore;
import org.junit.Test;
/**
*
* @author lee
* @version 1.0
* @since 1.0
*/
public class CertificateCoderTest{
private String password = "123456";
private String alias = "lee";
private String certificatePath = "d:/lee.cer";
private String keyStorePath = "d:/lee.keystore";
@Test
@Ignore
public void test() throws Exception {
System.err.println("公钥加密——私钥解密");
String inputStr = "Ceritifcate";
byte[] data = inputStr.getBytes();
byte[] encrypt = CertificateCoder.encryptByPublicKey(data, certificatePath);
byte[] decrypt = CertificateCoder.decryptByPrivateKey(encrypt, keyStorePath, alias, password);
String outputStr = new String(decrypt);
System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);
// 验证数据一致
assertArrayEquals(data, decrypt);
// 验证证书有效
assertTrue(CertificateCoder.verifyCertificate(certificatePath));
}
@Test
@Ignore
public void testSign() throws Exception {
System.err.println("私钥加密——公钥解密");
String inputStr = "sign";
byte[] data = inputStr.getBytes();
byte[] encodedData = CertificateCoder.encryptByPrivateKey(data, keyStorePath, alias, password);
byte[] decodedData = CertificateCoder.decryptByPublicKey(encodedData, certificatePath);
String outputStr = new String(decodedData);
System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);
assertEquals(inputStr, outputStr);
System.err.println("私钥签名——公钥验证签名");
// 产生签名
String sign = CertificateCoder.sign(encodedData, keyStorePath, alias, password);
System.err.println("签名:\r" + sign);
// 验证签名
boolean status = CertificateCoder.verify(encodedData, sign, certificatePath);
System.err.println("状态:\r" + status);
assertTrue(status);
}
}
控制台输出：
公钥加密——私钥解密 加密前: Ceritifcate 解密后: Ceritifcate 私钥加密——公钥解密 加密前: sign 解密后: sign 私钥签名——公钥验证签名 签名: PdKXLSbJ1FKnUuzFroOxVd0xgLHPp989u6+32pue1TIFTCX5pkopcdAr7IYIjOyuEFjVdnOb4Xlh 4p4w6c272CcUn0SuU9BkdVCLzERPj5M6AiDRCsMJMQnUtfeEsM0ehPRiu+1PSaIcRTW9LBOvQ088 zGCaNuriVK51TpOr50ymzsR/RfzPJ0ag/VisJQ/AB1Y8cMxZv99kdt8XTv3GSldXyfYx8HG775Yo Pet5tmSdDmj9QXgvUdwq0oy3j0Df/cPLLOPV5rwWyE0lohmyYovgSv+f9PUPa7N3kbLUwJQxy15m FnJgqG7eszksVoTWdy8OOrTZrkKl7MoCIj13rA== 状态: true