RSA加密

1、RSA加密簡介

RSA加密是一種非對稱加密。能夠在不直接傳遞密鑰的狀況下，完成解密。這可以確保信息的安全性，避免了直接傳遞密鑰所形成的被破解的風險。是由一對密鑰來進行加解密的過程，分別稱爲公鑰和私鑰。一般我的保存私鑰，公鑰是公開的。

2、RSA加密流程以下

1.系統生成一對密鑰（公鑰和私鑰）

2.系統將公鑰告知客戶

3.客戶根據收到的公鑰對數據進行加密，在發送給系統

4.系統收到加密後的數據，用私鑰進行解密

 1    public class RSA
 2    {
 3         /// <summary>
 4         /// 生成密鑰
 5         /// </summary>
 6         /// <param name="PrivateKey">私鑰</param>
 7         /// <param name="PublicKey">公鑰</param>
 8         /// <param name="KeySize">密鑰長度512,1024,2048，4096</param>
 9         public static void Generate(out string PrivateKey, out string PublicKey, int KeySize = 2048)
10         {
11             //初始化加密對象，而且設置密鑰的長度
12             RSACryptoServiceProvider serviceProvider = new RSACryptoServiceProvider(KeySize);
13             //false 表示僅包含公鑰。
14             PublicKey = serviceProvider.ToXmlString(false);
15             //true 表示同時包含 RSA 公鑰和私鑰
16             PrivateKey = serviceProvider.ToXmlString(true);
17         }
18   　　　　/// <summary>
19         /// 加密
20         /// </summary>
21         /// <param name="PublicKey">公鑰</param>
22         /// <param name="EncryptString">待加密字符串</param>
23         /// <returns></returns>
24         public static string RSAEncrypt(string PublicKey, string EncryptString)
25         {
26             byte[] inputByArray;
27             byte[] outPutByArray;
28             string result;
29             RSACryptoServiceProvider serviceProvider = new RSACryptoServiceProvider();
30             serviceProvider.FromXmlString(PublicKey);
31             inputByArray = Encoding.UTF8.GetBytes(EncryptString);
32             outPutByArray = serviceProvider.Encrypt(inputByArray, false);
33             result = Convert.ToBase64String(outPutByArray);
34             return result;
35         }
36 　　　　　/// <summary>
37         /// 解密
38         /// </summary>
39         /// <param name="PrivateKey">私鑰</param>
40         /// <param name="DecryptString">待加密字符串</param>
41         /// <returns></returns>
42         public static string RSADecrypt(string PrivateKey, string DecryptString)
43         {
44             byte[] inputByArray;
45             byte[] outPutByArray;
46             string result;
47             RSACryptoServiceProvider serviceProvider = new RSACryptoServiceProvider();
48             serviceProvider.FromXmlString(PrivateKey);
49             inputByArray = Convert.FromBase64String(DecryptString);
50             outPutByArray = serviceProvider.Decrypt(inputByArray, false);
51             result = Encoding.UTF8.GetString(outPutByArray);
52             return result;
53         }
54 
55     }

 1         static void Main(string[] args)
 2         {
 3             string PrivateKey;
 4             string PublicKey;
 5             RSA.Generate(out PrivateKey, out PublicKey);
 6             Console.WriteLine("私鑰的值：{0}，公鑰的值：{1}", PrivateKey, PublicKey);
 7             var encryptResult = RSA.RSAEncrypt(PublicKey, "123456");
 8             var decryptResult = RSA.RSADecrypt(PrivateKey, encryptResult);
 9             Console.WriteLine("加密後的值：{0}，解密後的值：{1}", encryptResult, decryptResult);
10         }