本篇的主要内容为Java证书体系的实现。
请大家在阅读本篇内容时先阅读 Java加密技术(四),预先了解RSA加密算法。
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:
其中 -genkey表示生成密钥 -alias指定别名,这里是tomcat -keyalg指定算法,这里是RSA -keystore指定存储位置,这里是d:\.keystore
在这里我使用的密码为 123456
控制台输出:
这时,在D盘下会生成一个.keystore的文件。
2.生成证书
光有keyStore文件是不够的,还需要证书文件,证书才是直接提供给外界使用的公钥凭证。
导出证书:
其中 -export指定为导出操作 -keystore指定keystore文件 -alias指定导出keystore文件中的别名 -file指向导出路径
这里的密码是 123456
控制台输出:
当然,使用方是需要注册证书的!
Ok,准备工作完成,开始Java实现!
通过java代码实现如下: Coder类见 Java加密技术(一)
再给出一个测试类:
控制台输出:

请大家在阅读本篇内容时先阅读 Java加密技术(四),预先了解RSA加密算法。

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 -alias tomcat -keyalg RSA -keystore d:\.keystore
keytool -genkey -alias tomcat -keyalg RSA -keystore d:\.keystore
其中 -genkey表示生成密钥 -alias指定别名,这里是tomcat -keyalg指定算法,这里是RSA -keystore指定存储位置,这里是d:\.keystore
在这里我使用的密码为 123456
控制台输出:
- 输入keystore密码:
- 再次输入新密码:
- 您的名字与姓氏是什么?
- [Unknown]: zlex
- 您的组织单位名称是什么?
- [Unknown]: zlex
- 您的组织名称是什么?
- [Unknown]: zlex
- 您所在的城市或区域名称是什么?
- [Unknown]: BJ
- 您所在的州或省份名称是什么?
- [Unknown]: BJ
- 该单位的两字母国家代码是什么
- [Unknown]: CN
- CN=zlex, OU=zlex, O=zlex, L=BJ, ST=BJ, C=CN 正确吗?
- [否]: Y
- 输入<tomcat>的主密码
- (如果和 keystore 密码相同,按回车):
- 再次输入新密码:
输入keystore密码: 再次输入新密码: 您的名字与姓氏是什么? [Unknown]: zlex 您的组织单位名称是什么? [Unknown]: zlex 您的组织名称是什么? [Unknown]: zlex 您所在的城市或区域名称是什么? [Unknown]: BJ 您所在的州或省份名称是什么? [Unknown]: BJ 该单位的两字母国家代码是什么 [Unknown]: CN CN=zlex, OU=zlex, O=zlex, L=BJ, ST=BJ, C=CN 正确吗? [否]: Y 输入<tomcat>的主密码 (如果和 keystore 密码相同,按回车): 再次输入新密码:
这时,在D盘下会生成一个.keystore的文件。
2.生成证书
光有keyStore文件是不够的,还需要证书文件,证书才是直接提供给外界使用的公钥凭证。
导出证书:
- keytool -export -keystore d:\.keystore -alias tomcat -file d:\tomcat.cer
keytool -export -keystore d:\.keystore -alias tomcat -file d:\tomcat.cer
其中 -export指定为导出操作 -keystore指定keystore文件 -alias指定导出keystore文件中的别名 -file指向导出路径
这里的密码是 123456
控制台输出:
- 输入keystore密码:
- 保存在文件中的认证 <d:\tomcat.cer>
输入keystore密码: 保存在文件中的认证 <d:\tomcat.cer>
当然,使用方是需要注册证书的!
Ok,准备工作完成,开始Java实现!
通过java代码实现如下: Coder类见 Java加密技术(一)
- import java.io.FileInputStream;
- import java.security.KeyFactory;
- 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.security.spec.PKCS8EncodedKeySpec;
- import java.security.spec.X509EncodedKeySpec;
- import java.util.Date;
- /**
- * 证书组件
- *
- * @author 梁栋
- * @version 1.0
- * @since 1.0
- */
- 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
- */
- public static String getPrivateKey(String keyStorePath, String alias,
- String password) throws Exception {
- KeyStore ks = getKeyStore(keyStorePath, alias, password);
- PrivateKey key = (PrivateKey) ks.getKey(alias, password.toCharArray());
- return encryptBASE64(key.getEncoded());
- }
- /**
- * 由Certificate获得公钥
- *
- * @param certificatePath
- * @return
- * @throws Exception
- */
- public static String getPublicKey(String certificatePath) throws Exception {
- Certificate certificate = getCertificate(certificatePath);
- PublicKey key = certificate.getPublicKey();
- return encryptBASE64(key.getEncoded());
- }
- /**
- * 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, alias, password);
- Certificate certificate = ks.getCertificate(alias);
- return certificate;
- }
- /**
- * 获得KeyStore
- *
- * @param keyStorePath
- * @param alias
- * @param password
- * @return
- * @throws Exception
- */
- private static KeyStore getKeyStore(String keyStorePath, String alias,
- String password) throws Exception {
- FileInputStream is = new FileInputStream(keyStorePath);
- KeyStore ks = KeyStore.getInstance(KEY_STORE);
- ks.load(is, password.toCharArray());
- is.close();
- return ks;
- }
- /**
- * 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;
- }
- /**
- * 验证公钥是否同属该证书
- *
- * @param publicKey
- * @param certificatePath
- * @return
- */
- public static boolean verifyPublicKey(String publicKey,
- String certificatePath) {
- boolean status = true;
- try {
- Certificate certificate = getCertificate(certificatePath);
- // 对公钥解密
- byte[] keyBytes = decryptBASE64(publicKey);
- // 取得公钥
- X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
- KeyFactory keyFactory = KeyFactory.getInstance(certificate
- .getPublicKey().getAlgorithm());
- PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
- certificate.verify(pubKey);
- } 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 privateKey
- * @param alias
- * @param password
- * @return
- * @throws Exception
- */
- public static String sign(byte[] sign, String keyStorePath, String privateKey,
- String alias, String password) throws Exception {
- // 获得证书
- X509Certificate x509Certificate = (X509Certificate) getCertificate(
- keyStorePath, alias, password);
- // 解密由base64编码的私钥
- byte[] keyBytes = decryptBASE64(privateKey);
- // 构造PKCS8EncodedKeySpec对象
- PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
- // 由证书公钥获得对应加密算法
- KeyFactory keyFactory = KeyFactory.getInstance(x509Certificate
- .getPublicKey().getAlgorithm());
- // 获取私钥
- PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
- // 构建签名
- Signature signature = Signature.getInstance(x509Certificate
- .getSigAlgName());
- signature.initSign(priKey);
- 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);
- }
- }
import java.io.FileInputStream;
import java.security.KeyFactory;
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.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;
/**
* 证书组件
*
* @author 梁栋
* @version 1.0
* @since 1.0
*/
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
*/
public static String getPrivateKey(String keyStorePath, String alias,
String password) throws Exception {
KeyStore ks = getKeyStore(keyStorePath, alias, password);
PrivateKey key = (PrivateKey) ks.getKey(alias, password.toCharArray());
return encryptBASE64(key.getEncoded());
}
/**
* 由Certificate获得公钥
*
* @param certificatePath
* @return
* @throws Exception
*/
public static String getPublicKey(String certificatePath) throws Exception {
Certificate certificate = getCertificate(certificatePath);
PublicKey key = certificate.getPublicKey();
return encryptBASE64(key.getEncoded());
}
/**
* 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, alias, password);
Certificate certificate = ks.getCertificate(alias);
return certificate;
}
/**
* 获得KeyStore
*
* @param keyStorePath
* @param alias
* @param password
* @return
* @throws Exception
*/
private static KeyStore getKeyStore(String keyStorePath, String alias,
String password) throws Exception {
FileInputStream is = new FileInputStream(keyStorePath);
KeyStore ks = KeyStore.getInstance(KEY_STORE);
ks.load(is, password.toCharArray());
is.close();
return ks;
}
/**
* 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;
}
/**
* 验证公钥是否同属该证书
*
* @param publicKey
* @param certificatePath
* @return
*/
public static boolean verifyPublicKey(String publicKey,
String certificatePath) {
boolean status = true;
try {
Certificate certificate = getCertificate(certificatePath);
// 对公钥解密
byte[] keyBytes = decryptBASE64(publicKey);
// 取得公钥
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(certificate
.getPublicKey().getAlgorithm());
PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
certificate.verify(pubKey);
} 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 privateKey
* @param alias
* @param password
* @return
* @throws Exception
*/
public static String sign(byte[] sign, String keyStorePath, String privateKey,
String alias, String password) throws Exception {
// 获得证书
X509Certificate x509Certificate = (X509Certificate) getCertificate(
keyStorePath, alias, password);
// 解密由base64编码的私钥
byte[] keyBytes = decryptBASE64(privateKey);
// 构造PKCS8EncodedKeySpec对象
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
// 由证书公钥获得对应加密算法
KeyFactory keyFactory = KeyFactory.getInstance(x509Certificate
.getPublicKey().getAlgorithm());
// 获取私钥
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 构建签名
Signature signature = Signature.getInstance(x509Certificate
.getSigAlgName());
signature.initSign(priKey);
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:
- import static org.junit.Assert.*;
- import org.junit.Before;
- import org.junit.Test;
- /**
- *
- * @author 梁栋
- * @version 1.0
- * @since 1.0
- */
- public class CertificateCoderTest {
- private String publicKey;
- private String privateKey;
- private String password = "123456";
- private String alias = "tomcat";
- private String certificatePath = "D:/tomcat.cer";
- private String keyStorePath = "D:/.keystore";
- @Before
- public void setUp() throws Exception {
- publicKey = CertificateCoder.getPublicKey(certificatePath);
- privateKey = CertificateCoder.getPrivateKey(keyStorePath, alias,
- password);
- System.err.println("公钥: \n\r" + publicKey);
- System.err.println("私钥: \n\r" + privateKey);
- }
- @Test
- public void test() throws Exception {
- System.err.println("公钥加密——私钥解密");
- String inputStr = "Ceritificate";
- byte[] data = inputStr.getBytes();
- byte[] encrypt = RSACoder.encryptByPublicKey(data, publicKey);
- byte[] decrypt = RSACoder.decryptByPrivateKey(encrypt, privateKey);
- 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));
- // 验证证书公钥匹配
- assertTrue(CertificateCoder.verifyPublicKey(publicKey, certificatePath));
- }
- @Test
- 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 = RSACoder.encryptByPrivateKey(data, privateKey);
- byte[] decodedData = RSACoder
- .decryptByPublicKey(encodedData, publicKey);
- 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, privateKey,
- 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);
- }
- }
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
/**
*
* @author 梁栋
* @version 1.0
* @since 1.0
*/
public class CertificateCoderTest {
private String publicKey;
private String privateKey;
private String password = "123456";
private String alias = "tomcat";
private String certificatePath = "D:/tomcat.cer";
private String keyStorePath = "D:/.keystore";
@Before
public void setUp() throws Exception {
publicKey = CertificateCoder.getPublicKey(certificatePath);
privateKey = CertificateCoder.getPrivateKey(keyStorePath, alias,
password);
System.err.println("公钥: \n\r" + publicKey);
System.err.println("私钥: \n\r" + privateKey);
}
@Test
public void test() throws Exception {
System.err.println("公钥加密——私钥解密");
String inputStr = "Ceritificate";
byte[] data = inputStr.getBytes();
byte[] encrypt = RSACoder.encryptByPublicKey(data, publicKey);
byte[] decrypt = RSACoder.decryptByPrivateKey(encrypt, privateKey);
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));
// 验证证书公钥匹配
assertTrue(CertificateCoder.verifyPublicKey(publicKey, certificatePath));
}
@Test
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 = RSACoder.encryptByPrivateKey(data, privateKey);
byte[] decodedData = RSACoder
.decryptByPublicKey(encodedData, publicKey);
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, privateKey,
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:
- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBQ/VMxf5Sb+urKceu5Ja4GfxHso+i+CCpQV2c
- W/O0yyu6u//7emmbwQGV3BLvaq9hEav1yGdvBteITS+mKMQFr2vFMsxhs+Dh82haQF2CXm11KtOg
- 2cjN6zgRmPVdYndVjeq7I9z+lkyHYZsOFUGr+oiPcas2Y9fa07TEfM4LXwIDAQAB
- 私钥:
- MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAMFD9UzF/lJv66spx67klrgZ/Eey
- j6L4IKlBXZxb87TLK7q7//t6aZvBAZXcEu9qr2ERq/XIZ28G14hNL6YoxAWva8UyzGGz4OHzaFpA
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- cdp6f/k3lU4UuzgGbt0A31hRlR7J0WjsutkrDJp4h6PD9OIJSblv2T+h7KHzMKY7kx8dn4CIg2Cm
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- bEj2fEKa4y2EG1xCH4MQSu0aRrR+ihv+thRjAkEAyStUwkyaNUE06ioGWCYu26QTcLyRwMyuVTcE
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- g4Xlfjray07N
- 公钥加密——私钥解密
- 加密前: Ceritificate
- 解密后: Ceritificate
- 公钥:
- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBQ/VMxf5Sb+urKceu5Ja4GfxHso+i+CCpQV2c
- W/O0yyu6u//7emmbwQGV3BLvaq9hEav1yGdvBteITS+mKMQFr2vFMsxhs+Dh82haQF2CXm11KtOg
- 2cjN6zgRmPVdYndVjeq7I9z+lkyHYZsOFUGr+oiPcas2Y9fa07TEfM4LXwIDAQAB
- 私钥:
- MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAMFD9UzF/lJv66spx67klrgZ/Eey
- j6L4IKlBX