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数据加密之RSA

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1、生成公钥私钥对

 1 package com.mao.common.util;
 2 
 3 import java.security.KeyPair;
 4 import java.security.KeyPairGenerator;
 5 import java.security.interfaces.RSAPrivateKey;
 6 import java.security.interfaces.RSAPublicKey;
 7 
 8 import org.apache.tomcat.util.codec.binary.Base64;
 9 
10 /**
11  * 
12  * 描述：密钥生成器
13  * @author mao2080@sina.com
14  * @created 2017年4月20日 下午8:32:20
15  * @since
16  */
17 public class Generator {
18 
19     public static final String ALGORITHM_RSA = "RSA";
20 
21     public static void main(String[] args) throws Exception {
22         KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(ALGORITHM_RSA);
23         keyPairGen.initialize(1024);
24         KeyPair keyPair = keyPairGen.generateKeyPair();
25         RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
26         byte[] keyBs = rsaPublicKey.getEncoded();
27         String publicKey = encodeBase64(keyBs);
28         System.out.println("生成的公钥：
" + publicKey);
29         RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
30         keyBs = rsaPrivateKey.getEncoded();
31         String  privateKey = encodeBase64(keyBs);
32         System.out.println("生成的私钥：
" + privateKey);
33     }
34     
35     /**
36      * 
37      * 描述：byte数组转String
38      * @author mao2080@sina.com
39      * @created 2017年4月9日 下午8:43:05
40      * @since 
41      * @param source
42      * @return
43      * @throws Exception
44      */
45     public static String encodeBase64(byte[] source) throws Exception {
46         return new String(Base64.encodeBase64(source), "UTF-8");
47     }
48 
49     /**
50      * 
51      * 描述：String转byte数组
52      * @author mao2080@sina.com
53      * @created 2017年4月9日 下午8:42:59
54      * @since 
55      * @param target
56      * @return
57      * @throws Exception
58      */
59     public static byte[] decodeBase64(String target) throws Exception {
60         return Base64.decodeBase64(target.getBytes("UTF-8"));
61     }
62 
63 }

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

  1 package com.mao.common.util;
  2 
  3 import java.security.KeyFactory;
  4 import java.security.PrivateKey;
  5 import java.security.PublicKey;
  6 import java.security.spec.PKCS8EncodedKeySpec;
  7 import java.security.spec.X509EncodedKeySpec;
  8 
  9 import javax.crypto.Cipher;
 10 
 11 import org.apache.tomcat.util.codec.binary.Base64;
 12 
 13 /**
 14  * 
 15  * 描述：安全工具类
 16  * @author mao2080@sina.com
 17  * @created 2017年4月20日 下午8:32:42
 18  * @since
 19  */
 20 public final class SecurityUtil {
 21     
 22     private static final String ALGORITHM_RSA = "RSA";
 23     
 24     /**RSA-charset*/
 25     private static final String RSA_CHARSET = "UTF-8";
 26     
 27     /**
 28      * 
 29      * 描述：将字符串通过RSA算法公钥加密
 30      * @author mao2080@sina.com
 31      * @created 2017年4月9日 上午09:18:51
 32      * @since 
 33      * @param content 需要加密的内容
 34      * @param pubKey 公钥
 35      * @return 加密后字符串
 36      * @throws Exception
 37      */
 38     private static String EncryptByRSAPubKey(String content, String pubKey) throws Exception {
 39         try {
 40             PublicKey publicKey = SecurityUtil.getRSAPubKey(pubKey);
 41             Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
 42             cipher.init(Cipher.ENCRYPT_MODE, publicKey);
 43             cipher.update(content.getBytes(SecurityUtil.RSA_CHARSET));
 44             return SecurityUtil.encodeBase64(cipher.doFinal());
 45         } catch (Exception e) {
 46             e.printStackTrace();
 47             throw new Exception();
 48         }
 49     }
 50  
 51     /**
 52      * 
 53      * 描述：将字符串通过RSA算法公钥解密
 54      * @author mao2080@sina.com
 55      * @created 2017年4月9日 上午09:18:51
 56      * @since 
 57      * @param content 需要解密的内容
 58      * @param pubKey 公钥
 59      * @return 解密后字符串
 60      * @throws Exception
 61      */
 62     private static String DecryptByRSAPubKey(String content, String pubKey) throws Exception {
 63         try {
 64             PublicKey publicKey = SecurityUtil.getRSAPubKey(pubKey);
 65             Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
 66             cipher.init(Cipher.DECRYPT_MODE, publicKey);
 67             cipher.update(SecurityUtil.decodeBase64(content));
 68             return new String(cipher.doFinal(), RSA_CHARSET);
 69         } catch (Exception e) {
 70             e.printStackTrace();
 71             throw new Exception();
 72         }
 73     }
 74     
 75     /**
 76      * 
 77      * 描述：将字符串通过RSA算法私钥加密
 78      * @author mao2080@sina.com
 79      * @created 2017年4月9日 上午09:18:51
 80      * @since 
 81      * @param content 需要加密的内容
 82      * @param priKey 私钥
 83      * @return 加密后字符串
 84      * @throws Exception
 85      */
 86     public static String EncryptByRSAPriKey(String content, String priKey) throws Exception {
 87         try {
 88             PrivateKey privateKey = SecurityUtil.getRSAPriKey(priKey);
 89             Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
 90             cipher.init(Cipher.ENCRYPT_MODE, privateKey);
 91             cipher.update(content.getBytes(SecurityUtil.RSA_CHARSET));
 92             return SecurityUtil.encodeBase64(cipher.doFinal());
 93         } catch (Exception e) {
 94             e.printStackTrace();
 95             throw new Exception();
 96         }
 97     }
 98  
 99     /**
100      * 
101      * 描述：将字符串通过RSA算法私钥解密
102      * @author mao2080@sina.com
103      * @created 2017年4月9日 上午09:18:51
104      * @since 
105      * @param content 需要解密的内容
106      * @param priKey 私钥
107      * @return 解密后字符串
108      * @throws Exception
109      */
110     public static String DecryptByRSAPriKey(String content, String priKey) throws Exception {
111         try {
112             PrivateKey privateKey = SecurityUtil.getRSAPriKey(priKey);
113             Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
114             cipher.init(Cipher.DECRYPT_MODE, privateKey);
115             cipher.update(SecurityUtil.decodeBase64(content));
116             return new String(cipher.doFinal(), SecurityUtil.RSA_CHARSET);
117         } catch (Exception e) {
118             e.printStackTrace();
119             throw new Exception();
120         }
121     }
122     
123     /**
124      * 
125      * 描述：获取RSA公钥
126      * @author mao2080@sina.com
127      * @created 2017年4月9日 上午09:18:51
128      * @since 
129      * @param priKey 私钥
130      * @return PublicKey
131      * @throws Exception
132      */
133     private static PublicKey getRSAPubKey(String pubKey) throws Exception {
134         try {
135             X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(SecurityUtil.decodeBase64(pubKey));
136             KeyFactory keyFactory = KeyFactory.getInstance(SecurityUtil.ALGORITHM_RSA);
137             return keyFactory.generatePublic(publicKeySpec);
138         } catch (Exception e) {
139             e.printStackTrace();
140             throw new Exception();
141         }
142     }
143 
144     /**
145      * 
146      * 描述：获取RSA私钥
147      * @author mao2080@sina.com
148      * @created 2017年4月9日 上午09:18:51
149      * @since 
150      * @param priKey 私钥
151      * @return PrivateKey
152      * @throws Exception
153      */
154     private static PrivateKey getRSAPriKey(String priKey) throws Exception {
155         try {
156             PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(SecurityUtil.decodeBase64(priKey));
157             KeyFactory keyFactory = KeyFactory.getInstance(SecurityUtil.ALGORITHM_RSA);
158             return keyFactory.generatePrivate(privateKeySpec);
159         } catch (Exception e) {
160             e.printStackTrace();
161             throw new Exception();
162         }
163     }
164     
165     /**
166      * base64编码
167      * @param source
168      * @return
169      * @throws Exception
170      */
171     public static String encodeBase64(byte[] source) throws Exception {
172         return new String(Base64.encodeBase64(source), "UTF-8");
173     }
174 
175     /**
176      * Base64解码
177      * @param target
178      * @return
179      * @throws Exception
180      */
181     public static byte[] decodeBase64(String target) throws Exception {
182         return Base64.decodeBase64(target.getBytes("UTF-8"));
183     }
184     
185     public static void main(String[] args) throws Exception {
186         String pubKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHj1kf4EV0zCVdleIq/3pSm+tV0xuDGaXDzDyjVhDmrSptFv3MkBRY73qxbs/ZHGsVAwsY1kvh5qrFLdUesGMw92PgWwSXrNfBxYBLECweG0iIe8vTtvo824KdrJK3/1jPSXMJ0jYRaWXGr0qtEv5ak81kF/pDMiDG86wLKnq1jQIDAQAB";
187         String priKey = "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";
188         String content = "12345678";
189         String s = EncryptByRSAPubKey(content, pubKey);
190         System.out.println("公钥加密后："+s);
191         System.out.println("私钥解密后："+DecryptByRSAPriKey(s, priKey));
192         content = "12345678";
193         s = EncryptByRSAPriKey(content, priKey);
194         System.out.println("私钥加密后："+s);
195         System.out.println("公钥解密后："+DecryptByRSAPubKey(s, pubKey));
196     }
197 
198 }

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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原文地址：https://www.cnblogs.com/mao2080/p/6740720.html