RSA

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Security.Cryptography;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 
 9 namespace MyEncrypt
10 {
11     /// <summary>
12     /// RSA ECC
13     /// 可逆非对称加密 
14     /// 非对称加密算法的优点是密钥管理很方便，缺点是速度慢。
15     /// </summary>
16     public class RsaEncrypt
17     {
18 
19         /// <summary>
20         /// 获取加密/解密对
21         /// Encrypt   Decrypt
22         /// </summary>
23         /// <returns>Encrypt   Decrypt</returns>
24         public static KeyValuePair<string, string> GetKeyPair()
25         {
26             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
27             string publicKey = RSA.ToXmlString(false);
28             string privateKey = RSA.ToXmlString(true);
29             return new KeyValuePair<string, string>(publicKey, privateKey);
30         }
31 
32         /// <summary>
33         /// 加密：内容+加密key
34         /// </summary>
35         /// <param name="content"></param>
36         /// <param name="encryptKey">加密key</param>
37         /// <returns></returns>
38         public static string Encrypt(string content, string encryptKey)
39         {
40             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
41             rsa.FromXmlString(encryptKey);
42             UnicodeEncoding ByteConverter = new UnicodeEncoding();
43             byte[] DataToEncrypt = ByteConverter.GetBytes(content);
44             byte[] resultBytes = rsa.Encrypt(DataToEncrypt, false);
45             return Convert.ToBase64String(resultBytes);
46         }
47 
48         /// <summary>
49         /// 解密  内容+解密key
50         /// </summary>
51         /// <param name="content"></param>
52         /// <param name="decryptKey">解密key</param>
53         /// <returns></returns>
54         public static string Decrypt(string content, string decryptKey)
55         {
56             byte[] dataToDecrypt = Convert.FromBase64String(content);
57             RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
58             RSA.FromXmlString(decryptKey);
59             byte[] resultBytes = RSA.Decrypt(dataToDecrypt, false);
60             UnicodeEncoding ByteConverter = new UnicodeEncoding();
61             return ByteConverter.GetString(resultBytes);
62         }
63 
64 
65         /// <summary>
66         /// 可以合并在一起的，，每次产生一组新的密钥
67         /// </summary>
68         /// <param name="content"></param>
69         /// <param name="encryptKey">加密key</param>
70         /// <param name="decryptKey">解密key</param>
71         /// <returns>加密后结果</returns>
72         private static string Encrypt(string content, out string publicKey, out string privateKey)
73         {
74             RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider();
75             publicKey = rsaProvider.ToXmlString(false);
76             privateKey = rsaProvider.ToXmlString(true);
77 
78             UnicodeEncoding ByteConverter = new UnicodeEncoding();
79             byte[] DataToEncrypt = ByteConverter.GetBytes(content);
80             byte[] resultBytes = rsaProvider.Encrypt(DataToEncrypt, false);
81             return Convert.ToBase64String(resultBytes);
82         }
83     }
84 }