Java加密技术（四）

原文地址： http://snowolf.iteye.com/blog/381767

接下来我们介绍典型的非对称加密算法——RSA

RSA
    这种算法1978年就出现了，它是第一个既能用于数据加密也能用于数字签名的算法。它易于理解和操作，也很流行。算法的名字以发明者的名字命名：Ron Rivest, AdiShamir 和Leonard Adleman。
    这种加密算法的特点主要是密钥的变化，上文我们看到DES只有一个密钥。相当于只有一把钥匙，如果这把钥匙丢了，数据也就不安全了。RSA同时有两把钥匙，公钥与私钥。同时支持数字签名。数字签名的意义在于，对传输过来的数据进行校验。确保数据在传输工程中不被修改。

流程分析：

1. 甲方构建密钥对儿，将公钥公布给乙方，将私钥保留。
2. 甲方使用私钥加密数据，然后用私钥对加密后的数据签名，发送给乙方签名以及加密后的数据；乙方使用公钥、签名来验证待解密数据是否有效，如果有效使用公钥对数据解密。
3. 乙方使用公钥加密数据，向甲方发送经过加密后的数据；甲方获得加密数据，通过私钥解密。

按如上步骤给出序列图，如下：

1. 
2. 
3. 

通过java代码实现如下：Coder类见 Java加密技术（一）

Java代码  

1. import java.security.Key;   
2. import java.security.KeyFactory;   
3. import java.security.KeyPair;   
4. import java.security.KeyPairGenerator;   
5. import java.security.PrivateKey;   
6. import java.security.PublicKey;   
7. import java.security.Signature;   
8. import java.security.interfaces.RSAPrivateKey;   
9. import java.security.interfaces.RSAPublicKey;   
10. import java.security.spec.PKCS8EncodedKeySpec;   
11. import java.security.spec.X509EncodedKeySpec;   
12.   
13. import java.util.HashMap;   
14. import java.util.Map;   
15.   
16. import javax.crypto.Cipher;   
17.   
18. /**  
19.  * RSA安全编码组件  
20.  *   
21.  * @author 梁栋  
22.  * @version 1.0  
23.  * @since 1.0  
24.  */  
25. public abstract class RSACoder extends Coder {   
26.     public static final String KEY_ALGORITHM = "RSA";   
27.     public static final String SIGNATURE_ALGORITHM = "MD5withRSA";   
28.   
29.     private static final String PUBLIC_KEY = "RSAPublicKey";   
30.     private static final String PRIVATE_KEY = "RSAPrivateKey";   
31.   
32.     /**  
33.      * 用私钥对信息生成数字签名  
34.      *   
35.      * @param data  
36.      *            加密数据  
37.      * @param privateKey  
38.      *            私钥  
39.      *   
40.      * @return  
41.      * @throws Exception  
42.      */  
43.     public static String sign(byte[] data, String privateKey) throws Exception {   
44.         // 解密由base64编码的私钥   
45.         byte[] keyBytes = decryptBASE64(privateKey);   
46.   
47.         // 构造PKCS8EncodedKeySpec对象   
48.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);   
49.   
50.         // KEY_ALGORITHM 指定的加密算法   
51.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
52.   
53.         // 取私钥匙对象   
54.         PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);   
55.   
56.         // 用私钥对信息生成数字签名   
57.         Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);   
58.         signature.initSign(priKey);   
59.         signature.update(data);   
60.   
61.         return encryptBASE64(signature.sign());   
62.     }   
63.   
64.     /**  
65.      * 校验数字签名  
66.      *   
67.      * @param data  
68.      *            加密数据  
69.      * @param publicKey  
70.      *            公钥  
71.      * @param sign  
72.      *            数字签名  
73.      *   
74.      * @return 校验成功返回true 失败返回false  
75.      * @throws Exception  
76.      *   
77.      */  
78.     public static boolean verify(byte[] data, String publicKey, String sign)   
79.             throws Exception {   
80.   
81.         // 解密由base64编码的公钥   
82.         byte[] keyBytes = decryptBASE64(publicKey);   
83.   
84.         // 构造X509EncodedKeySpec对象   
85.         X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);   
86.   
87.         // KEY_ALGORITHM 指定的加密算法   
88.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
89.   
90.         // 取公钥匙对象   
91.         PublicKey pubKey = keyFactory.generatePublic(keySpec);   
92.   
93.         Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);   
94.         signature.initVerify(pubKey);   
95.         signature.update(data);   
96.   
97.         // 验证签名是否正常   
98.         return signature.verify(decryptBASE64(sign));   
99.     }   
100.   
101.     /**  
102.      * 解密<br>  
103.      * 用私钥解密  
104.      *   
105.      * @param data  
106.      * @param key  
107.      * @return  
108.      * @throws Exception  
109.      */  
110.     public static byte[] decryptByPrivateKey(byte[] data, String key)   
111.             throws Exception {   
112.         // 对密钥解密   
113.         byte[] keyBytes = decryptBASE64(key);   
114.   
115.         // 取得私钥   
116.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);   
117.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
118.         Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);   
119.   
120.         // 对数据解密   
121.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());   
122.         cipher.init(Cipher.DECRYPT_MODE, privateKey);   
123.   
124.         return cipher.doFinal(data);   
125.     }   
126.   
127.     /**  
128.      * 解密<br>  
129.      * 用私钥解密  
130.      *   
131.      * @param data  
132.      * @param key  
133.      * @return  
134.      * @throws Exception  
135.      */  
136.     public static byte[] decryptByPublicKey(byte[] data, String key)   
137.             throws Exception {   
138.         // 对密钥解密   
139.         byte[] keyBytes = decryptBASE64(key);   
140.   
141.         // 取得公钥   
142.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);   
143.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
144.         Key publicKey = keyFactory.generatePublic(x509KeySpec);   
145.   
146.         // 对数据解密   
147.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());   
148.         cipher.init(Cipher.DECRYPT_MODE, publicKey);   
149.   
150.         return cipher.doFinal(data);   
151.     }   
152.   
153.     /**  
154.      * 加密<br>  
155.      * 用公钥加密  
156.      *   
157.      * @param data  
158.      * @param key  
159.      * @return  
160.      * @throws Exception  
161.      */  
162.     public static byte[] encryptByPublicKey(byte[] data, String key)   
163.             throws Exception {   
164.         // 对公钥解密   
165.         byte[] keyBytes = decryptBASE64(key);   
166.   
167.         // 取得公钥   
168.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);   
169.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
170.         Key publicKey = keyFactory.generatePublic(x509KeySpec);   
171.   
172.         // 对数据加密   
173.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());   
174.         cipher.init(Cipher.ENCRYPT_MODE, publicKey);   
175.   
176.         return cipher.doFinal(data);   
177.     }   
178.   
179.     /**  
180.      * 加密<br>  
181.      * 用私钥加密  
182.      *   
183.      * @param data  
184.      * @param key  
185.      * @return  
186.      * @throws Exception  
187.      */  
188.     public static byte[] encryptByPrivateKey(byte[] data, String key)   
189.             throws Exception {   
190.         // 对密钥解密   
191.         byte[] keyBytes = decryptBASE64(key);   
192.   
193.         // 取得私钥   
194.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);   
195.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
196.         Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);   
197.   
198.         // 对数据加密   
199.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());   
200.         cipher.init(Cipher.ENCRYPT_MODE, privateKey);   
201.   
202.         return cipher.doFinal(data);   
203.     }   
204.   
205.     /**  
206.      * 取得私钥  
207.      *   
208.      * @param keyMap  
209.      * @return  
210.      * @throws Exception  
211.      */  
212.     public static String getPrivateKey(Map<String, Object> keyMap)   
213.             throws Exception {   
214.         Key key = (Key) keyMap.get(PRIVATE_KEY);   
215.   
216.         return encryptBASE64(key.getEncoded());   
217.     }   
218.   
219.     /**  
220.      * 取得公钥  
221.      *   
222.      * @param keyMap  
223.      * @return  
224.      * @throws Exception  
225.      */  
226.     public static String getPublicKey(Map<String, Object> keyMap)   
227.             throws Exception {   
228.         Key key = (Key) keyMap.get(PUBLIC_KEY);   
229.   
230.         return encryptBASE64(key.getEncoded());   
231.     }   
232.   
233.     /**  
234.      * 初始化密钥  
235.      *   
236.      * @return  
237.      * @throws Exception  
238.      */  
239.     public static Map<String, Object> initKey() throws Exception {   
240.         KeyPairGenerator keyPairGen = KeyPairGenerator   
241.                 .getInstance(KEY_ALGORITHM);   
242.         keyPairGen.initialize(1024);   
243.   
244.         KeyPair keyPair = keyPairGen.generateKeyPair();   
245.   
246.         // 公钥   
247.         RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();   
248.   
249.         // 私钥   
250.         RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   
251.   
252.         Map<String, Object> keyMap = new HashMap<String, Object>(2);   
253.   
254.         keyMap.put(PUBLIC_KEY, publicKey);   
255.         keyMap.put(PRIVATE_KEY, privateKey);   
256.         return keyMap;   
257.     }   
258. }  

import java.security.Key;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import java.util.HashMap;import java.util.Map;import javax.crypto.Cipher;/** * RSA安全编码组件 *  * @author 梁栋 * @version 1.0 * @since 1.0 */public abstract class RSACoder extends Coder {public static final String KEY_ALGORITHM = "RSA";public static final String SIGNATURE_ALGORITHM = "MD5withRSA";private static final String PUBLIC_KEY = "RSAPublicKey";private static final String PRIVATE_KEY = "RSAPrivateKey";/** * 用私钥对信息生成数字签名 *  * @param data *            加密数据 * @param privateKey *            私钥 *  * @return * @throws Exception */public static String sign(byte[] data, String privateKey) throws Exception {// 解密由base64编码的私钥byte[] keyBytes = decryptBASE64(privateKey);// 构造PKCS8EncodedKeySpec对象PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);// KEY_ALGORITHM 指定的加密算法KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);// 取私钥匙对象PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);// 用私钥对信息生成数字签名Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initSign(priKey);signature.update(data);return encryptBASE64(signature.sign());}/** * 校验数字签名 *  * @param data *            加密数据 * @param publicKey *            公钥 * @param sign *            数字签名 *  * @return 校验成功返回true 失败返回false * @throws Exception *  */public static boolean verify(byte[] data, String publicKey, String sign)throws Exception {// 解密由base64编码的公钥byte[] keyBytes = decryptBASE64(publicKey);// 构造X509EncodedKeySpec对象X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);// KEY_ALGORITHM 指定的加密算法KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);// 取公钥匙对象PublicKey pubKey = keyFactory.generatePublic(keySpec);Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initVerify(pubKey);signature.update(data);// 验证签名是否正常return signature.verify(decryptBASE64(sign));}/** * 解密<br> * 用私钥解密 *  * @param data * @param key * @return * @throws Exception */public static byte[] decryptByPrivateKey(byte[] data, String key)throws Exception {// 对密钥解密byte[] keyBytes = decryptBASE64(key);// 取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);// 对数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, privateKey);return cipher.doFinal(data);}/** * 解密<br> * 用私钥解密 *  * @param data * @param key * @return * @throws Exception */public static byte[] decryptByPublicKey(byte[] data, String key)throws Exception {// 对密钥解密byte[] keyBytes = decryptBASE64(key);// 取得公钥X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key publicKey = keyFactory.generatePublic(x509KeySpec);// 对数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, publicKey);return cipher.doFinal(data);}/** * 加密<br> * 用公钥加密 *  * @param data * @param key * @return * @throws Exception */public static byte[] encryptByPublicKey(byte[] data, String key)throws Exception {// 对公钥解密byte[] keyBytes = decryptBASE64(key);// 取得公钥X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key publicKey = keyFactory.generatePublic(x509KeySpec);// 对数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, publicKey);return cipher.doFinal(data);}/** * 加密<br> * 用私钥加密 *  * @param data * @param key * @return * @throws Exception */public static byte[] encryptByPrivateKey(byte[] data, String key)throws Exception {// 对密钥解密byte[] keyBytes = decryptBASE64(key);// 取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);// 对数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, privateKey);return cipher.doFinal(data);}/** * 取得私钥 *  * @param keyMap * @return * @throws Exception */public static String getPrivateKey(Map<String, Object> keyMap)throws Exception {Key key = (Key) keyMap.get(PRIVATE_KEY);return encryptBASE64(key.getEncoded());}/** * 取得公钥 *  * @param keyMap * @return * @throws Exception */public static String getPublicKey(Map<String, Object> keyMap)throws Exception {Key key = (Key) keyMap.get(PUBLIC_KEY);return encryptBASE64(key.getEncoded());}/** * 初始化密钥 *  * @return * @throws Exception */public static Map<String, Object> initKey() throws Exception {KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);keyPairGen.initialize(1024);KeyPair keyPair = keyPairGen.generateKeyPair();// 公钥RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();// 私钥RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();Map<String, Object> keyMap = new HashMap<String, Object>(2);keyMap.put(PUBLIC_KEY, publicKey);keyMap.put(PRIVATE_KEY, privateKey);return keyMap;}}

再给出一个测试类：

Java代码  

1. import static org.junit.Assert.*;   
2.   
3. import org.junit.Before;   
4. import org.junit.Test;   
5.   
6. import java.util.Map;   
7.   
8. /**  
9.  *   
10.  * @author 梁栋  
11.  * @version 1.0  
12.  * @since 1.0  
13.  */  
14. public class RSACoderTest {   
15.     private String publicKey;   
16.     private String privateKey;   
17.   
18.     @Before  
19.     public void setUp() throws Exception {   
20.         Map<String, Object> keyMap = RSACoder.initKey();   
21.   
22.         publicKey = RSACoder.getPublicKey(keyMap);   
23.         privateKey = RSACoder.getPrivateKey(keyMap);   
24.         System.err.println("公钥: \n\r" + publicKey);   
25.         System.err.println("私钥： \n\r" + privateKey);   
26.     }   
27.   
28.     @Test  
29.     public void test() throws Exception {   
30.         System.err.println("公钥加密——私钥解密");   
31.         String inputStr = "abc";   
32.         byte[] data = inputStr.getBytes();   
33.   
34.         byte[] encodedData = RSACoder.encryptByPublicKey(data, publicKey);   
35.   
36.         byte[] decodedData = RSACoder.decryptByPrivateKey(encodedData,   
37.                 privateKey);   
38.   
39.         String outputStr = new String(decodedData);   
40.         System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);   
41.         assertEquals(inputStr, outputStr);   
42.   
43.     }   
44.   
45.     @Test  
46.     public void testSign() throws Exception {   
47.         System.err.println("私钥加密——公钥解密");   
48.         String inputStr = "sign";   
49.         byte[] data = inputStr.getBytes();   
50.   
51.         byte[] encodedData = RSACoder.encryptByPrivateKey(data, privateKey);   
52.   
53.         byte[] decodedData = RSACoder   
54.                 .decryptByPublicKey(encodedData, publicKey);   
55.   
56.         String outputStr = new String(decodedData);   
57.         System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);   
58.         assertEquals(inputStr, outputStr);   
59.   
60.         System.err.println("私钥签名——公钥验证签名");   
61.         // 产生签名   
62.         String sign = RSACoder.sign(encodedData, privateKey);   
63.         System.err.println("签名:\r" + sign);   
64.   
65.         // 验证签名   
66.         boolean status = RSACoder.verify(encodedData, publicKey, sign);   
67.         System.err.println("状态:\r" + status);   
68.         assertTrue(status);   
69.   
70.     }   
71.   
72. }  

import static org.junit.Assert.*;import org.junit.Before;import org.junit.Test;import java.util.Map;/** *  * @author 梁栋 * @version 1.0 * @since 1.0 */public class RSACoderTest {private String publicKey;private String privateKey;@Beforepublic void setUp() throws Exception {Map<String, Object> keyMap = RSACoder.initKey();publicKey = RSACoder.getPublicKey(keyMap);privateKey = RSACoder.getPrivateKey(keyMap);System.err.println("公钥: \n\r" + publicKey);System.err.println("私钥： \n\r" + privateKey);}@Testpublic void test() throws Exception {System.err.println("公钥加密——私钥解密");String inputStr = "abc";byte[] data = inputStr.getBytes();byte[] encodedData = RSACoder.encryptByPublicKey(data, publicKey);byte[] decodedData = RSACoder.decryptByPrivateKey(encodedData,privateKey);String outputStr = new String(decodedData);System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);assertEquals(inputStr, outputStr);}@Testpublic 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 = RSACoder.sign(encodedData, privateKey);System.err.println("签名:\r" + sign);// 验证签名boolean status = RSACoder.verify(encodedData, publicKey, sign);System.err.println("状态:\r" + status);assertTrue(status);}}

控制台输出：

Console代码  

1. 公钥:    
2.   
3. MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCYU/+I0+z1aBl5X6DUUOHQ7FZpmBSDbKTtx89J   
4. EcB64jFCkunELT8qiKly7fzEqD03g8ALlu5XvX+bBqHFy7YPJJP0ekE2X3wjUnh2NxlqpH3/B/xm   
5. 1ZdSlCwDIkbijhBVDjA/bu5BObhZqQmDwIxlQInL9oVz+o6FbAZCyHBd7wIDAQAB   
6.   
7. 私钥：    
8.   
9. MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAJhT/4jT7PVoGXlfoNRQ4dDsVmmY   
10. FINspO3Hz0kRwHriMUKS6cQtPyqIqXLt/MSoPTeDwAuW7le9f5sGocXLtg8kk/R6QTZffCNSeHY3   
11. GWqkff8H/GbVl1KULAMiRuKOEFUOMD9u7kE5uFmpCYPAjGVAicv2hXP6joVsBkLIcF3vAgMBAAEC   
12. gYBvZHWoZHmS2EZQqKqeuGr58eobG9hcZzWQoJ4nq/CarBAjw/VovUHE490uK3S9ht4FW7Yzg3LV   
13. /MB06Huifh6qf/X9NQA7SeZRRC8gnCQk6JuDIEVJOud5jU+9tyumJakDKodQ3Jf2zQtNr+5ZdEPl   
14. uwWgv9c4kmpjhAdyMuQmYQJBANn6pcgvyYaia52dnu+yBUsGkaFfwXkzFSExIbi0MXTkhEb/ER/D   
15. rLytukkUu5S5ecz/KBa8U4xIslZDYQbLz5ECQQCy5dutt7RsxN4+dxCWn0/1FrkWl2G329Ucewm3   
16. QU9CKu4D+7Kqdj+Ha3lXP8F0Etaaapi7+EfkRUpukn2ItZV/AkEAlk+I0iphxT1rCB0Q5CjWDY5S   
17. Df2B5JmdEG5Y2o0nLXwG2w44OLct/k2uD4cEcuITY5Dvi/4BftMCZwm/dnhEgQJACIktJSnJwxLV   
18. o9dchENPtlsCM9C/Sd2EWpqISSUlmfugZbJBwR5pQ5XeMUqKeXZYpP+HEBj1nS+tMH9u2/IGEwJA   
19. fL8mZiZXan/oBKrblAbplNcKWGRVD/3y65042PAEeghahlJMiYquV5DzZajuuT0wbJ5xQuZB01+X   
20. nfpFpBJ2dw==   
21.   
22. 公钥加密——私钥解密   
23. 加密前: abc   
24.   
25. 解密后: abc   
26. 公钥:    
27.   
28. MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdOj40yEB48XqWxmPILmJAc7UecIN7F32etSHF   
29. 9rwbuEh3+iTPOGSxhoSQpOED0vOb0ZIMkBXZSgsxLaBSin2RZ09YKWRjtpCA0kDkiD11gj4tzTiM   
30. l9qq1kwSK7ZkGAgodEn3yIILVmQDuEImHOXFtulvJ71ka07u3LuwUNdB/wIDAQAB   
31.   
32. 私钥：    
33.   
34. MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAN06PjTIQHjxepbGY8guYkBztR5w   
35. g3sXfZ61IcX2vBu4SHf6JM84ZLGGhJCk4QPS85vRkgyQFdlKCzEtoFKKfZFnT1gpZGO2kIDSQOSI   
36. PXWCPi3NOIyX2qrWTBIrtmQYCCh0SffIggtWZAO4QiYc5cW26W8nvWRrTu7cu7BQ10H/AgMBAAEC   
37. gYEAz2JWBizjI31bqhP4XiP9PuY5F3vqBW4T+L9cFbQiyumKJc58yzTWUAUGKIIn3enXLG7dNqGr   
38. mbJro4JeFIJ3CiVDpXR9+FluIgI4SXm7ioGKF2NOMA9LR5Fu82W+pLfpTN2y2SaLYWEDZyp53BxY   
39. j9gUxaxi1MQs+C1ZgDF2xmECQQDy70bQntbRfysP+ppCtd56YRnES1Tyekw0wryS2tr+ivQJl7JF   
40. gp5rPAOXpgrq36xHDwUspQ0sJ0vj0O7ywxr1AkEA6SAaLhrJJrYucC0jxwAhUYyaPN+aOsWymaRh   
41. 9jA/Wc0wp29SbGTh5CcMuGpXm1g0M+FKW3dGiHgS3rVUKim4owJAbnxgapUzAgiiHxxMeDaavnHW   
42. 9C2GrtjsO7qtZOTgYI/1uT8itvZW8lJTF+9OW8/qXE76fXl7ai9dFnl5kzMk2QJBALfHz/vCsArt   
43. mkRiwY6zApE4Z6tPl1V33ymSVovvUzHnOdD1SKQdD5t+UV/crb3QVi8ED0t2B0u0ZSPfDT/D7kMC   
44. QDpwdj9k2F5aokLHBHUNJPFDAp7a5QMaT64gv/d48ITJ68Co+v5WzLMpzJBYXK6PAtqIhxbuPEc2   
45. I2k1Afmrwyw=   
46.   
47. 私钥加密——公钥解密   
48. 加密前: sign   
49.   
50. 解密后: sign   
51. 私钥签名——公钥验证签名   
52. 签名:   
53. ud1RsIwmSC1pN22I4IXteg1VD2FbiehKUfNxgVSHzvQNIK+d20FCkHCqh9djP3h94iWnIUY0ifU+   
54. mbJkhAl/i5krExOE0hknOnPMcEP+lZV1RbJI2zG2YooSp2XDleqrQk5e/QF2Mx0Zxt8Xsg7ucVpn   
55. i3wwbYWs9wSzIf0UjlM=   
56.   
57. 状态:   
58. true  

公钥: MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCYU/+I0+z1aBl5X6DUUOHQ7FZpmBSDbKTtx89JEcB64jFCkunELT8qiKly7fzEqD03g8ALlu5XvX+bBqHFy7YPJJP0ekE2X3wjUnh2NxlqpH3/B/xm1ZdSlCwDIkbijhBVDjA/bu5BObhZqQmDwIxlQInL9oVz+o6FbAZCyHBd7wIDAQAB私钥： 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公钥加密——私钥解密加密前: abc解密后: abc公钥: MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdOj40yEB48XqWxmPILmJAc7UecIN7F32etSHF9rwbuEh3+iTPOGSxhoSQpOED0vOb0ZIMkBXZSgsxLaBSin2RZ09YKWRjtpCA0kDkiD11gj4tzTiMl9qq1kwSK7ZkGAgodEn3yIILVmQDuEImHOXFtulvJ71ka07u3LuwUNdB/wIDAQAB私钥： 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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:ud1RsIwmSC1pN22I4IXteg1VD2FbiehKUfNxgVSHzvQNIK+d20FCkHCqh9djP3h94iWnIUY0ifU+mbJkhAl/i5krExOE0hknOnPMcEP+lZV1RbJI2zG2YooSp2XDleqrQk5e/QF2Mx0Zxt8Xsg7ucVpni3wwbYWs9wSzIf0UjlM=状态:true

    简要总结一下，使用公钥加密、私钥解密，完成了乙方到甲方的一次数据传递，通过私钥加密、公钥解密，同时通过私钥签名、公钥验证签名，完成了一次甲方到乙方的数据传递与验证，两次数据传递完成一整套的数据交互！

类似数字签名，数字信封是这样描述的：

数字信封
　　数字信封用加密技术来保证只有特定的收信人才能阅读信的内容。
流程：
    信息发送方采用对称密钥来加密信息，然后再用接收方的公钥来加密此对称密钥（这部分称为数字信封），再将它和信息一起发送给接收方；接收方先用相应的私钥打开数字信封，得到对称密钥，然后使用对称密钥再解开信息。