数据加密之RSA

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1、生成公钥私钥对

 package com.mao.common.util;

 import java.security.KeyPair;
 import java.security.KeyPairGenerator;
 import java.security.interfaces.RSAPrivateKey;
 import java.security.interfaces.RSAPublicKey;

 import org.apache.tomcat.util.codec.binary.Base64;

 /**
  *
  * 描述：密钥生成器
  * @author mao2080@sina.com
  * @created 2017年4月20日 下午8:32:20
  * @since
  */
 public class Generator {

     public static final String ALGORITHM_RSA = "RSA";

     public static void main(String[] args) throws Exception {
         KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(ALGORITHM_RSA);
         keyPairGen.initialize(1024);
         KeyPair keyPair = keyPairGen.generateKeyPair();
         RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
         byte[] keyBs = rsaPublicKey.getEncoded();
         String publicKey = encodeBase64(keyBs);
         System.out.println("生成的公钥：\r\n" + publicKey);
         RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
         keyBs = rsaPrivateKey.getEncoded();
         String  privateKey = encodeBase64(keyBs);
         System.out.println("生成的私钥：\r\n" + privateKey);
     }

     /**
      *
      * 描述：byte数组转String
      * @author mao2080@sina.com
      * @created 2017年4月9日 下午8:43:05
      * @since
      * @param source
      * @return
      * @throws Exception
      */
     public static String encodeBase64(byte[] source) throws Exception {
         return new String(Base64.encodeBase64(source), "UTF-8");
     }

     /**
      *
      * 描述：String转byte数组
      * @author mao2080@sina.com
      * @created 2017年4月9日 下午8:42:59
      * @since
      * @param target
      * @return
      * @throws Exception
      */
     public static byte[] decodeBase64(String target) throws Exception {
         return Base64.decodeBase64(target.getBytes("UTF-8"));
     }

 }

运行结果：

生成的公钥：
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHj1kf4EV0zCVdleIq/3pSm+tV0xuDGaXDzDyjVhDmrSptFv3MkBRY73qxbs/ZHGsVAwsY1kvh5qrFLdUesGMw92PgWwSXrNfBxYBLECweG0iIe8vTtvo824KdrJK3/1jPSXMJ0jYRaWXGr0qtEv5ak81kF/pDMiDG86wLKnq1jQIDAQAB
生成的私钥：
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

2、使用加解密方法

 package com.mao.common.util;

 import java.security.KeyFactory;
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.security.spec.X509EncodedKeySpec;

 import javax.crypto.Cipher;

 import org.apache.tomcat.util.codec.binary.Base64;

 /**
  *
  * 描述：安全工具类
  * @author mao2080@sina.com
  * @created 2017年4月20日 下午8:32:42
  * @since
  */
 public final class SecurityUtil {

     private static final String ALGORITHM_RSA = "RSA";

     /**RSA-charset*/
     private static final String RSA_CHARSET = "UTF-8";

     /**
      *
      * 描述：将字符串通过RSA算法公钥加密
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param content 需要加密的内容
      * @param pubKey 公钥
      * @return 加密后字符串
      * @throws Exception
      */
     private static String EncryptByRSAPubKey(String content, String pubKey) throws Exception {
         try {
             PublicKey publicKey = SecurityUtil.getRSAPubKey(pubKey);
             Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
             cipher.init(Cipher.ENCRYPT_MODE, publicKey);
             cipher.update(content.getBytes(SecurityUtil.RSA_CHARSET));
             return SecurityUtil.encodeBase64(cipher.doFinal());
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      *
      * 描述：将字符串通过RSA算法公钥解密
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param content 需要解密的内容
      * @param pubKey 公钥
      * @return 解密后字符串
      * @throws Exception
      */
     private static String DecryptByRSAPubKey(String content, String pubKey) throws Exception {
         try {
             PublicKey publicKey = SecurityUtil.getRSAPubKey(pubKey);
             Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
             cipher.init(Cipher.DECRYPT_MODE, publicKey);
             cipher.update(SecurityUtil.decodeBase64(content));
             return new String(cipher.doFinal(), RSA_CHARSET);
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      *
      * 描述：将字符串通过RSA算法私钥加密
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param content 需要加密的内容
      * @param priKey 私钥
      * @return 加密后字符串
      * @throws Exception
      */
     public static String EncryptByRSAPriKey(String content, String priKey) throws Exception {
         try {
             PrivateKey privateKey = SecurityUtil.getRSAPriKey(priKey);
             Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
             cipher.init(Cipher.ENCRYPT_MODE, privateKey);
             cipher.update(content.getBytes(SecurityUtil.RSA_CHARSET));
             return SecurityUtil.encodeBase64(cipher.doFinal());
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      *
      * 描述：将字符串通过RSA算法私钥解密
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param content 需要解密的内容
      * @param priKey 私钥
      * @return 解密后字符串
      * @throws Exception
      */
     public static String DecryptByRSAPriKey(String content, String priKey) throws Exception {
         try {
             PrivateKey privateKey = SecurityUtil.getRSAPriKey(priKey);
             Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
             cipher.init(Cipher.DECRYPT_MODE, privateKey);
             cipher.update(SecurityUtil.decodeBase64(content));
             return new String(cipher.doFinal(), SecurityUtil.RSA_CHARSET);
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      *
      * 描述：获取RSA公钥
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param priKey 私钥
      * @return PublicKey
      * @throws Exception
      */
     private static PublicKey getRSAPubKey(String pubKey) throws Exception {
         try {
             X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(SecurityUtil.decodeBase64(pubKey));
             KeyFactory keyFactory = KeyFactory.getInstance(SecurityUtil.ALGORITHM_RSA);
             return keyFactory.generatePublic(publicKeySpec);
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      *
      * 描述：获取RSA私钥
      * @author mao2080@sina.com
      * @created 2017年4月9日 上午09:18:51
      * @since
      * @param priKey 私钥
      * @return PrivateKey
      * @throws Exception
      */
     private static PrivateKey getRSAPriKey(String priKey) throws Exception {
         try {
             PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(SecurityUtil.decodeBase64(priKey));
             KeyFactory keyFactory = KeyFactory.getInstance(SecurityUtil.ALGORITHM_RSA);
             return keyFactory.generatePrivate(privateKeySpec);
         } catch (Exception e) {
             e.printStackTrace();
             throw new Exception();
         }
     }

     /**
      * base64编码
      * @param source
      * @return
      * @throws Exception
      */
     public static String encodeBase64(byte[] source) throws Exception {
         return new String(Base64.encodeBase64(source), "UTF-8");
     }

     /**
      * Base64解码
      * @param target
      * @return
      * @throws Exception
      */
     public static byte[] decodeBase64(String target) throws Exception {
         return Base64.decodeBase64(target.getBytes("UTF-8"));
     }

     public static void main(String[] args) throws Exception {
         String pubKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHj1kf4EV0zCVdleIq/3pSm+tV0xuDGaXDzDyjVhDmrSptFv3MkBRY73qxbs/ZHGsVAwsY1kvh5qrFLdUesGMw92PgWwSXrNfBxYBLECweG0iIe8vTtvo824KdrJK3/1jPSXMJ0jYRaWXGr0qtEv5ak81kF/pDMiDG86wLKnq1jQIDAQAB";
         String priKey = "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";
         String content = "12345678";
         String s = EncryptByRSAPubKey(content, pubKey);
         System.out.println("公钥加密后："+s);
         System.out.println("私钥解密后："+DecryptByRSAPriKey(s, priKey));
         content = "12345678";
         s = EncryptByRSAPriKey(content, priKey);
         System.out.println("私钥加密后："+s);
         System.out.println("公钥解密后："+DecryptByRSAPubKey(s, pubKey));
     }

 }

运行结果：

公钥加密后：hTsS0vrBpaQgp+T1dyoTQ8jJKt6qAmE5Np3URgYjRuA0vrib9fElFz8BFX5NHOlcmDMZKuudulfehQ3P43DNA0k9dAMStIuofQIA70fY5GQxNjLTu0S7/J510wYPAtopMDqO9eriVg39R3KzJUPwgMKQGELBCOWstK9nO1F6z0w=
私钥解密后：12345678
私钥加密后：xaKKEf6eC80Zh3MbrQA13hbpIv57IFvW2N1oMshojZYqGNTbGQvyZcHOkVzAsVlZJDyexDKdD82kP8lfZ/729BC/7EGwtXlND8w68pfOsSDYtknRLrXpflNU7C+EqzUQBUsruj+tUc7m050eZmJw7u6DF3lIIviIICWV/O1OiDw=
公钥解密后：12345678

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