RSA非对称加密简析-java

1 非对称加密算法

1.1 概述

　　1976年，美国学者Dime和Henman为解决信息公开传送和密钥管理问题，提出一种新的密钥交换协议，允许在不安全的媒体上的通讯双方交换信息，安全地达成一致的密钥，这就是“公开密钥系统”。

　　与对称加密算法不同，非对称加密算法需要两个密钥：公开密钥（publickey）和私有密钥（privatekey）。公开密钥与私有密钥是一对，如果用公开密钥对数据进行加密，只有用对应的私有密钥才能解密；如果用私有密钥对数据进行加密，那么只有用对应的公开密钥才能解密。因为加密和解密使用的是两个不同的密钥，所以这种算法叫作非对称加密算法。

1.2 加密流程

　　如下图所示，甲乙之间使用非对称加密的方式完成了重要信息的安全传输。

　　非对称加密工作过程简要示意图

　　1、乙方生成一对密钥（公钥和私钥）并将公钥向其它方公开。

　　2、得到该公钥的甲方使用该密钥对机密信息进行加密后再发送给乙方。

　　3、乙方再用自己保存的另一把专用密钥（私钥）对加密后的信息进行解密。乙方只能用其专用密钥（私钥）解密由对应的公钥加密后的信息。

　　在传输过程中，即使攻击者截获了传输的密文，并得到了乙的公钥，也无法破解密文，因为只有乙的私钥才能解密密文。

　　同样，如果乙要回复加密信息给甲，那么需要甲先公布甲的公钥给乙用于加密，甲自己保存甲的私钥用于解密。

2 RSA加密算法

2.1 概述

　　RSA是目前最有影响力和最常用的公钥加密算法，它能够抵抗到目前为止已知的绝大多数密码攻击，已被ISO推荐为公钥数据加密标准。

　　RSA公开密钥密码体制。所谓的公开密钥密码体制就是使用不同的加密密钥与解密密钥，是一种“由已知加密密钥推导出解密密钥在计算上是不可行的”密码体制。

　　在公开密钥密码体制中，加密密钥（即公开密钥）PK是公开信息，而解密密钥（即秘密密钥）SK是需要保密的。加密算法E和解密算法D也都是公开的。虽然解密密钥SK是由公开密钥PK决定的，但却不能根据PK计算出SK。

　　正是基于这种理论，1978年出现了著名的RSA算法，它通常是先生成一对RSA 密钥，其中之一是保密密钥，由用户保存；另一个为公开密钥，可对外公开，甚至可在网络服务器中注册。为提高保密强度，RSA密钥至少为500位长，一般推荐使用1024位。这就使加密的计算量很大。为减少计算量，在传送信息时，常采用传统加密方法与公开密钥加密方法相结合的方式，即信息采用改进的DES或IDEA对话密钥加密，然后使用RSA密钥加密对话密钥和信息摘要。对方收到信息后，用不同的密钥解密并可核对信息摘要。

　　RSA算法是第一个能同时用于加密和数字签名的算法，也易于理解和操作。RSA是被研究得最广泛的公钥算法，从提出到现今的三十多年里，经历了各种攻击的考验，逐渐为人们接受，普遍认为是目前最优秀的公钥方案之一。

2.2 算法实现过程

1. 随意选择两个大的质数p和q，p不等于q，计算N=pq。

2. 根据欧拉函数，不大于N且与N互质的整数個数為(p-1)(q-1)。

3. 选择一个整数e与(p-1)(q-1)互质，并且e小于(p-1)(q-1)。

4. 用以下这个公式计算d：d× e ≡ 1 (mod (p-1)(q-1))。

5. 将p和q的记录销毁。

以上内容中，(N,e)是公钥，(N,d)是私钥。

2.3 算法缺点

　　1）产生密钥很麻烦，受到素数产生技术的限制，因而难以做到一次一密。

　　2）安全性，RSA的安全性依赖于大数的因子分解，但并没有从理论上证明破译RSA的难度与大数分解难度等价，而且密码学界多数人士倾向于因子分解不是NP问题。

　　3）速度太慢，由于RSA 的分组长度太大，为保证安全性，n 至少也要 600 bits以上，使运算代价很高，尤其是速度较慢，较对称密码算法慢几个数量级；且随着大数分解技术的发展，这个长度还在增加，不利于数据格式的标准化。

2.4 java代码实现加解密

  1 package xin.dreaming.rsa;
  2 
  3 import java.io.ByteArrayOutputStream;
  4 import java.io.UnsupportedEncodingException;
  5 import java.security.Key;
  6 import java.security.KeyFactory;
  7 import java.security.KeyPair;
  8 import java.security.KeyPairGenerator;
  9 import java.security.NoSuchAlgorithmException;
 10 import java.security.interfaces.RSAPrivateKey;
 11 import java.security.interfaces.RSAPublicKey;
 12 import java.security.spec.PKCS8EncodedKeySpec;
 13 import java.security.spec.X509EncodedKeySpec;
 14 import java.util.HashMap;
 15 import java.util.Map;
 16 
 17 import javax.crypto.Cipher;
 18 
 19 import org.bouncycastle.util.encoders.Base64;
 20 
 21 /**
 22  * Rsa工具类
 23  * 
 24  * @author DREAMING.XIN
 25  *
 26  */
 27 public abstract class RsaUtils {
 28     /**
 29      * 生成公钥私钥对，使用默认模长1024。
 30      * 
 31      * @return Object[] : 0:公钥( RSAPublicKey )，1:私钥( RSAPrivateKey )
 32      */
 33 
 34     private static final int DEFAULT_KEY_LEN = 2048;
 35 
 36     public static Map<String, String> genKeyPair() {
 37         return genKeyPair(DEFAULT_KEY_LEN);
 38 
 39     }
 40 
 41     /**
 42      * 指定模长生成公私钥对
 43      * 
 44      * @param modulus
 45      * @return
 46      */
 47     public static Map<String, String> genKeyPair(int modulus) {
 48         KeyPairGenerator keyPairGen;
 49         try {
 50             keyPairGen = KeyPairGenerator.getInstance("RSA");
 51             keyPairGen.initialize(modulus);
 52             KeyPair keyPair = keyPairGen.generateKeyPair();
 53 
 54             Map<String, String> keyMaps = new HashMap<String, String>();
 55             RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
 56             keyMaps.put("publicKey", new String(Base64.encode(publicKey.getEncoded())));
 57             RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
 58             keyMaps.put("privateKey", new String(Base64.encode(privateKey.getEncoded())));
 59 
 60             return keyMaps;
 61         } catch (NoSuchAlgorithmException e) {
 62             throw new RuntimeException(e);
 63         }
 64     }
 65 
 66     /**
 67      * 公钥加密
 68      * 
 69      * @param publicKeyBytes
 70      * @param data
 71      * @param modulus
 72      *            公钥模长，范围512-2048。
 73      * @return
 74      */
 75     public static byte[] encryptByPublicKey(byte[] publicKeyBytes, byte[] data, int modulus) {
 76         try {
 77             // RSA最大加密明文大小
 78             int maxEncryptBlock = modulus / 8 - 11;
 79 
 80             X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyBytes);
 81             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
 82             Key publicK = keyFactory.generatePublic(x509KeySpec);
 83             Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
 84             cipher.init(Cipher.ENCRYPT_MODE, publicK);
 85             int inputLen = data.length;
 86             ByteArrayOutputStream out = new ByteArrayOutputStream();
 87             int offSet = 0;
 88             byte[] cache;
 89             int i = 0;
 90             while (inputLen - offSet > 0) {
 91                 if (inputLen - offSet > maxEncryptBlock) {
 92                     cache = cipher.doFinal(data, offSet, maxEncryptBlock);
 93                 } else {
 94                     cache = cipher.doFinal(data, offSet, inputLen - offSet);
 95                 }
 96                 out.write(cache, 0, cache.length);
 97                 i++;
 98                 offSet = i * maxEncryptBlock;
 99             }
100             byte[] encryptedData = out.toByteArray();
101             out.close();
102             return encryptedData;
103         } catch (Exception e) {
104             throw new RuntimeException(e);
105         }
106 
107     }
108 
109     /**
110      * 公钥加密，密钥模长使用默认长度1024。
111      * 
112      * @param publicKeyBytes
113      *            公钥RSAPublicKey getEncoded()
114      * @param data
115      *            要加密的字节数组
116      */
117     public static byte[] encryptByPublicKey(byte[] publicKeyBytes, byte[] data) {
118         return encryptByPublicKey(publicKeyBytes, data, DEFAULT_KEY_LEN);
119     }
120 
121     /**
122      * 公钥解密
123      * 
124      * @param publicKeyBytes
125      *            公钥RSAPublicKey getEncoded()
126      * @param encryptedData
127      *            被(私钥)加密过的字节数组
128      * @param modulus
129      *            模长，范围512-2048
130      * @return
131      */
132     public static byte[] decryptByPublicKey(byte[] publicKeyBytes, byte[] encryptedData, int modulus) {
133         // RSA最大解密密文大小
134         int maxDecryptBlock = modulus / 8;
135         try {
136             X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyBytes);
137             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
138             Key publicK = keyFactory.generatePublic(x509KeySpec);
139             Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
140             cipher.init(Cipher.DECRYPT_MODE, publicK);
141             int inputLen = encryptedData.length;
142             ByteArrayOutputStream out = new ByteArrayOutputStream();
143             int offSet = 0;
144             byte[] cache;
145             int i = 0;
146             // 对数据分段解密
147             while (inputLen - offSet > 0) {
148                 if (inputLen - offSet > maxDecryptBlock) {
149                     cache = cipher.doFinal(encryptedData, offSet, maxDecryptBlock);
150                 } else {
151                     cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
152                 }
153                 out.write(cache, 0, cache.length);
154                 i++;
155                 offSet = i * maxDecryptBlock;
156             }
157             byte[] decryptedData = out.toByteArray();
158             out.close();
159             return decryptedData;
160         } catch (Exception e) {
161             throw new RuntimeException(e);
162         }
163     }
164 
165     /**
166      * 公钥解密，默认模长1024
167      * 
168      * @param publicKeyBytes
169      *            公钥RSAPublicKey getEncoded()
170      * @param encryptedData
171      *            被(私钥)加密过的字节数组
172      */
173     public static byte[] decryptByPublicKey(byte[] publicKeyBytes, byte[] encryptedData) {
174         return decryptByPublicKey(publicKeyBytes, encryptedData, DEFAULT_KEY_LEN);
175     }
176 
177     /**
178      * 私钥加密
179      * 
180      * @param privateKeyBytes
181      *            私钥RSAPrivateKey getEncoded()
182      * @param data
183      *            要加密的字节数组
184      * @param modulus
185      *            模长，范围512-2048。
186      */
187     public static byte[] encryptByPrivateKey(byte[] privateKeyBytes, byte[] data, int modulus) {
188         try {
189             // RSA最大加密明文大小
190             int maxEncryptBlock = modulus / 8 - 11;
191 
192             PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
193             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
194             Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
195             Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
196             cipher.init(Cipher.ENCRYPT_MODE, privateK);
197             int inputLen = data.length;
198             ByteArrayOutputStream out = new ByteArrayOutputStream();
199             int offSet = 0;
200             byte[] cache;
201             int i = 0;
202             while (inputLen - offSet > 0) {
203                 if (inputLen - offSet > maxEncryptBlock) {
204                     cache = cipher.doFinal(data, offSet, maxEncryptBlock);
205                 } else {
206                     cache = cipher.doFinal(data, offSet, inputLen - offSet);
207                 }
208                 out.write(cache, 0, cache.length);
209                 i++;
210                 offSet = i * maxEncryptBlock;
211             }
212             byte[] encryptedData = out.toByteArray();
213             out.close();
214             return encryptedData;
215         } catch (Exception e) {
216             throw new RuntimeException(e);
217         }
218     }
219 
220     /**
221      * 私钥加密，默认模长1024。
222      * 
223      * @param privateKeyBytes
224      *            私钥RSAPrivateKey getEncoded()
225      * @param data
226      *            要加密的字节数组
227      */
228     public static byte[] encryptByPrivateKey(byte[] privateKeyBytes, byte[] data) {
229         return encryptByPrivateKey(privateKeyBytes, data, DEFAULT_KEY_LEN);
230     }
231 
232     /**
233      * 私钥解密
234      * 
235      * @param privateKeyBytes
236      *            私钥RSAPrivateKey getEncoded()
237      * @param encryptedData
238      *            被(公钥)加密过的字节数组
239      * @param modulus
240      *            模长，范围512-2048
241      */
242     public static byte[] decryptByPrivateKey(byte[] privateKeyBytes, byte[] encryptedData, int modulus) {
243         try {
244             // RSA最大解密密文大小
245             int maxDecryptBlock = modulus / 8;
246 
247             PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
248             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
249             Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
250             Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
251             cipher.init(Cipher.DECRYPT_MODE, privateK);
252             int inputLen = encryptedData.length;
253             ByteArrayOutputStream out = new ByteArrayOutputStream();
254             int offSet = 0;
255             byte[] cache;
256             int i = 0;
257             while (inputLen - offSet > 0) {
258                 if (inputLen - offSet > maxDecryptBlock) {
259                     cache = cipher.doFinal(encryptedData, offSet, maxDecryptBlock);
260                 } else {
261                     cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
262                 }
263                 out.write(cache, 0, cache.length);
264                 i++;
265                 offSet = i * maxDecryptBlock;
266             }
267             byte[] decryptedData = out.toByteArray();
268             out.close();
269             return decryptedData;
270         } catch (Exception e) {
271             throw new RuntimeException(e);
272         }
273     }
274 
275     /**
276      * 私钥解密，默认模长1024。
277      * 
278      * @param privateKeyBytes
279      *            私钥RSAPrivateKey getEncoded()
280      * @param encryptedData
281      *            被(公钥)加密过的字节数组
282      */
283     public static byte[] decryptByPrivateKey(byte[] privateKeyBytes, byte[] encryptedData) {
284         return decryptByPrivateKey(privateKeyBytes, encryptedData, DEFAULT_KEY_LEN);
285     }
286 
287     public static void main(String[] args) throws UnsupportedEncodingException {
288         // 加密原串
289         String value = "DREAMING.XIN";
290         System.out.println("加密原串 ： ");
291         System.out.println(value);
292         System.out.println("------------------------------------------------------------------------------------------");
293         // 生成公私钥对
294         Map<String, String> genKeyPair = genKeyPair();
295 
296         System.out.println("自行生成公私钥对： ");
297         System.out.println(genKeyPair);
298         System.out.println("------------------------------------------------------------------------------------------");
299         byte[] encryptByPublicKey = encryptByPublicKey(Base64.decode(genKeyPair.get("publicKey").getBytes("utf-8")),
300                 value.getBytes());
301 
302         // 3、Base64编码
303         byte[] encode = Base64.encode(encryptByPublicKey);
304 
305         System.out.println("最终加密结果： ");
306         String sign = new String(encode, "utf-8");
307         System.out.println(new String(encode, "utf-8"));
308         System.out.println("------------------------------------------------------------------------------------------");
309 
310         // 1、签名密文->Base64解码->RSA解密
311         byte[] signCipherArr = decryptByPrivateKey(Base64.decode(genKeyPair.get("privateKey").getBytes("utf-8")),
312                 Base64.decode(sign.getBytes("utf-8")));
313         System.out.println("解密结果： ");
314         System.out.println(new String (signCipherArr));
315         System.out.println("------------------------------------------------------------------------------------------");
316 
317     }
318 }

输出结果：

加密原串 ： 
DREAMING.XIN
------------------------------------------------------------------------------------------
自行生成公私钥对： 
{publicKey=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkmRw1oug/LBmpkRsubsKoeEBQvGeRfUTMX8fTEuLJqKuWfHkB6HJ/08xf/BYhbL+GrUFk5DR/lbJdnD9SEx0ZDZHecrjj262T67izwf7d+rB3o7z5w/3Pk3p3Ye6Ns7SdGM6D8O6InUK4mQFSBKQhw25BqPzUQKb4DY/S+I2OAx1/qVB56Na+if5H9ttP8nhVVnQZXheTPh5Say0+ySFEBb1i2sxJQuwFLbtA9RkKNFSSB2+4sBrn5fRmemu6OGToR/WQ8KFa96+u9X2t41HPxa7dTF+g9btkEMWwbiXkPatjD9JaNXKKrueIQoDt/FKonUZQ0AafSs8r/xsrb4pfwIDAQAB, privateKey=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}
------------------------------------------------------------------------------------------
最终加密结果： 
YmGXP+nSAY23ENUryid4zdE6KRAfFGhQWPJ4NAM1odZIEZCh5BbOtw437E85TdzABNE+NTDVogq+AI8WfAiD0yUpDukdRrZMb/IwG5k7xCgsVo0Tgt2SiH9bZFkvMaIIWH6d90muVtA/dyGHPSk/WmdgSl3QCcsZ3JAzMeadZwtL685eBhJD6hwXwKLfQj1OQBlLH3R9D5gBNGf36RHyi20LteTOKIR9lvMQPGbsnvspqi7t3xo5ajLpeuCr9azEovP0UFiiaxrkGLYMG2YM91r7JXUCn2gtVuDnXPFVVfOj84mN51229UJwQWBZe0BGPLSpROmOUZeWj2gjvuyqGg==
------------------------------------------------------------------------------------------
解密结果： 
DREAMING.XIN
------------------------------------------------------------------------------------------

2.5 java代码实现加签验签

  1 package xin.dreaming.rsa;
  2 
  3 import org.apache.commons.codec.binary.Base64;
  4 
  5 import javax.crypto.Cipher;
  6 import java.io.ByteArrayInputStream;
  7 import java.security.KeyFactory;
  8 import java.security.PrivateKey;
  9 import java.security.PublicKey;
 10 import java.security.Signature;
 11 import java.security.cert.Certificate;
 12 import java.security.cert.CertificateFactory;
 13 import java.security.spec.PKCS8EncodedKeySpec;
 14 
 15 /**
 16  * 
 17  * @author DREAMING.XIN
 18  *
 19  */
 20 public class RSAUtil {
 21 
 22     private static final String CHARSET = "UTF-8";
 23 
 24     private static final String algorithm = "SHA256withRSA";
 25 
 26     /**
 27      * 网联请求报文签名
 28      * 
 29      * @param privateKey
 30      *            机构私钥字符串
 31      * @param content
 32      *            签名原文
 33      * @return 签名密文
 34      * @throws Exception
 35      */
 36     public static String sign(String privateKey, String content) throws Exception {
 37         Signature signature = Signature.getInstance(algorithm);
 38         signature.initSign(convertPrivateKey(privateKey));
 39         signature.update(content.getBytes(CHARSET));
 40         return Base64.encodeBase64String(signature.sign());
 41     }
 42 
 43     /**
 44      * 网联返回报文验签
 45      * 
 46      * @param publicKey
 47      *            网联公钥字符串
 48      * @param content
 49      *            验签原文报文
 50      * @param signStr
 51      *            网联返回签名字符串
 52      * @return 验签结果
 53      * @throws Exception
 54      */
 55     public static boolean vertify(String publicKey, String content, String signStr) throws Exception {
 56         Signature signature = Signature.getInstance(algorithm);
 57         signature.initVerify(convertPublicKey(publicKey));
 58         signature.update(content.getBytes(CHARSET));
 59         return signature.verify(Base64.decodeBase64(signStr.getBytes(CHARSET)));
 60     }
 61 
 62     /**
 63      * 对称密钥公钥加密
 64      * 
 65      * @param publicKey
 66      *            网联公钥字符串
 67      * @param content
 68      *            密钥原文
 69      * @return 加密密文
 70      * @throws Exception
 71      */
 72     public static String encryptByPublicKey(String publicKey, String content) throws Exception {
 73         String result = null;
 74         try {
 75             Cipher cipher = cipher = Cipher.getInstance("RSA");
 76             cipher.init(Cipher.ENCRYPT_MODE, convertPublicKey(publicKey));
 77             byte[] encoded = cipher.doFinal(content.getBytes(CHARSET));
 78             result = Base64.encodeBase64String(encoded);
 79         } catch (Exception e) {
 80         
 81         }
 82         return result;
 83     }
 84 
 85     /**
 86      * 对称密钥密文解密
 87      * 
 88      * @param privateKey
 89      *            机构私钥字符串
 90      * @param content
 91      *            网联对称密钥密文
 92      * @return 对称密钥明文
 93      * @throws Exception
 94      */
 95     public static String decryptByPrivateKey(String privateKey, String content) throws Exception {
 96         String result = null;
 97         try {
 98             Cipher cipher = cipher = Cipher.getInstance("RSA");
 99             cipher.init(Cipher.DECRYPT_MODE, convertPrivateKey(privateKey));
100             byte[] encoded = cipher.doFinal(Base64.decodeBase64(content.getBytes(CHARSET)));
101             result = new String(encoded, CHARSET);
102         } catch (Exception e) {
103         }
104         return result;
105     }
106 
107     public static PrivateKey convertPrivateKey(String keyStr) throws Exception {
108         PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(keyStr.getBytes(CHARSET)));
109         KeyFactory keyFactory = KeyFactory.getInstance("RSA");
110         return keyFactory.generatePrivate(keySpec);
111     }
112 
113     public static PublicKey convertPublicKey(String keyStr) throws Exception {
114         CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
115         Certificate certificate = certificateFactory
116                 .generateCertificate(new ByteArrayInputStream(Base64.decodeBase64(keyStr.getBytes(CHARSET))));
117         return certificate.getPublicKey();
118     }
119 
120     public static void main(String[] args) throws Exception {
121         // 获取私钥
122         String privatekey = CertConfig.PrivateKey;
123         String publicKey = CertConfig.PublicKeyZ;
124         
125         String sign = sign(privatekey, "DREAMING.XIN");
126 
127         System.out.println("加签结果："+sign);
128 
129         boolean vertify = vertify(publicKey,"DREAMING.XIN",sign);
130                 
131         System.out.println("验签结果： "+vertify);
132     }
133 
134 }

密钥java类：

 1 package xin.dreaming.rsa;
 2 
 3 public class CertConfig {
 4 
 5     public static final String PrivateKey ="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";
 6     //签名私钥
 7     //public static final String PrivateKey ="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";
 8     //验签公钥
 9     public static final String PublicKey ="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";
10     //验签公钥
11     public static final String PublicKeyZ ="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";
12     
13     //铭感信息加密
14     public static final String MGJMKEY = "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";
15 }

输出结果：

加签结果：fbolWDixTffN2oeMSpAUkbDvQ3ZXNeEUPgGOgQ3boCTIft34kIA8LtSwRMD+uAbKSk6vZffDb2Zro7IDGhS8lv35Bz23zs9j04GMB4d55EnjqjyRQAQer8fTujKMPHa2JUPjlUau6wjJaK50A8+TysC7Qq4uz69T0iXtTJPvFxwjCeXL0fShIuD4UQwJkQk7Mqqvzdy71dPs94EobMVEX84lSkfTwZKCwAR58NbYdgWWGKcwbU/N+riU6NyiCVr1rj+j9LqUrgW0HHDfp8hNcRm1lluGgk7BrjD7ZBpdYwuhbA1v2IGEsdhYVyMHdFpg6Ta3uoHoCJRJhtMp1Hw0qw==
验签结果： true

说明：

　　一般rsa加密解密，加签验签都会与BASE64编码或url编码结合使用。

参考：

　　1、https://baike.baidu.com/item/RSA%E7%AE%97%E6%B3%95/263310?fr=aladdin

posted @ 2017-11-28 11:19 DREAM.XIN 阅读(2171) 评论(0) 编辑收藏举报

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