证书备忘代码,Java代码库,德仔网

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【Java】证书备忘
作者:狙击手 / 发布于2015/1/12/ 478

	package com.sniper.survey.util.coder;
	
	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 javax.crypto.Cipher;
	
	/**
	* 证书组建
	*
	* @author sniper
	*
	*/
	public class CertificateCoder {
	
	 /**
	 * 证书类型
	 */
	 private static final String CERT_TYPE = "X.509";
	
	 /**
	 * 获取私钥根据 keystore
	 *
	 * @param keyStorePath
	 * @param alias
	 * @param password
	 * @return
	 * @throws Exception
	 */
	 public static PrivateKey getPrivateKeyByStore(String keyStorePath,
	 String alias, String password) throws Exception {
	 KeyStore ks = getKeyStore(keyStorePath, password);
	 PrivateKey privateKey = (PrivateKey) ks.getKey(alias,
	 password.toCharArray());
	 return privateKey;
	 }
	
	 /**
	 * 获取 keystore
	 *
	 * @param keyStorePath
	 * @param password
	 * @return
	 * @throws Exception
	 */
	 private static KeyStore getKeyStore(String keyStorePath, String password)
	 throws Exception {
	 // 默认是jks
	 KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
	 FileInputStream is = new FileInputStream(keyStorePath);
	 ks.load(is, password.toCharArray());
	 is.close();
	 return ks;
	 }
	
	 /**
	 * 根据证书获取公钥
	 *
	 * @param certificatePath
	 * @return
	 * @throws Exception
	 */
	 public static PublicKey getPublicKeyByCertificate(String certificatePath)
	 throws Exception {
	 Certificate certificate = getCertificate(certificatePath);
	 return certificate.getPublicKey();
	 }
	
	 /**
	 * 根据证书路径获取证书
	 *
	 * @param certificatePath
	 * @return
	 * @throws Exception
	 */
	 private static Certificate getCertificate(String certificatePath)
	 throws Exception {
	 CertificateFactory certificateFactory = CertificateFactory
	 .getInstance(CERT_TYPE);
	 FileInputStream is = new FileInputStream(certificatePath);
	 Certificate certificate = certificateFactory.generateCertificate(is);
	 is.close();
	 return certificate;
	 }
	
	 /**
	 * 获取证书
	 *
	 * @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);
	 return ks.getCertificate(alias);
	 }
	
	 /**
	 * 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 {
	
	 PrivateKey privateKey = getPrivateKeyByStore(keyStorePath, alias,
	 password);
	 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 {
	
	 PrivateKey privateKey = getPrivateKeyByStore(keyStorePath, alias,
	 password);
	
	 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 {
	 PublicKey publicKey = getPublicKeyByCertificate(certificatePath);
	 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 {
	 PublicKey publicKey = getPublicKeyByCertificate(certificatePath);
	 Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
	 cipher.init(Cipher.DECRYPT_MODE, publicKey);
	 return cipher.doFinal(data);
	 }
	
	 /**
	 * 签名
	 *
	 * @param sign
	 * @param keyStorePath
	 * @param alias
	 * @param password
	 * @return
	 * @throws Exception
	 */
	 public static byte[] sign(byte[] sign, String keyStorePath, String alias,
	 String password) throws Exception {
	 X509Certificate certificate = (X509Certificate) getCertificate(
	 keyStorePath, alias, password);
	 Signature signature = Signature
	 .getInstance(certificate.getSigAlgName());
	 PrivateKey privateKey = getPrivateKeyByStore(keyStorePath, alias,
	 password);
	 signature.initSign(privateKey);
	 signature.update(sign);
	 return signature.sign();
	 }
	
	 /**
	 * 验证签名
	 *
	 * @param data
	 * @param sign
	 * @param certificatePath
	 * @return
	 * @throws Exception
	 */
	 public static boolean verify(byte[] data, byte[] sign,
	 String certificatePath) throws Exception {
	 X509Certificate x509Certificate = (X509Certificate) getCertificate(certificatePath);
	 Signature signature = Signature.getInstance(x509Certificate
	 .getSigAlgName());
	 signature.initVerify(x509Certificate);
	 signature.update(data);
	 return signature.verify(sign);
	 }
	
	 public static void main(String[] args) throws Exception {
	
	 String password = "sniper";
	 String alias = "laolang";
	 String aliasClient = "laolang.client";
	 String aliasServer = "laolang.server";
	 String aliasRoot = "laolang.root";
	
	 String certificatePath = "/etc/ssl/certs/laolang.server.cer";
	 String keystorePath = "/etc/ssl/laolang.server.keystore";
	
	 String inputStr = "数字证书";
	 byte[] data = inputStr.getBytes();
	
	 // 公钥加密
	 byte[] decrypt = encryptByPublicKey(data, certificatePath);
	 // 私钥解密
	 byte[] encrypt = decryptByPrivateKey(decrypt, keystorePath, alias,
	 password);
	 String outStr = new String(encrypt);
	 System.out.println("加密前:\t" + inputStr);
	 System.out.println("加密后:\t" + outStr);
	 }
	
	}
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