1 using System;
 2 using System.Security.Cryptography;
 3 using System.Text;
 4 
 5 namespace AES
 6 {
 7     class Program
 8     {
 9         static void Main(string[] args)
10         {
11             string str = "Hello world";
12             string key = "12345678876543211234567887654abc";
13             string result = AesEncrypt(str, key);
14             Console.WriteLine(result);
15             Console.WriteLine(AesDecrypt(result, key));
16             Console.ReadKey();
17         }
18 
19         /// <summary>
20         ///  AES 加密
21         /// </summary>
22         /// <param name="str">明文（待加密）</param>
23         /// <param name="key">密文</param>
24         /// <returns></returns>
25         public static string AesEncrypt(string str, string key)
26         {
27             if (string.IsNullOrEmpty(str))
28                 return null;
29             Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
30 
31             RijndaelManaged rm = new RijndaelManaged
32             {
33                 Key = Encoding.UTF8.GetBytes(key),
34                 Mode = CipherMode.ECB,
35                 Padding = PaddingMode.PKCS7
36             };
37 
38             ICryptoTransform cTransform = rm.CreateEncryptor();
39             Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
40 
41             return Convert.ToBase64String(resultArray, 0, resultArray.Length);
42         }
43         /// <summary>
44         ///  AES 解密
45         /// </summary>
46         /// <param name="str">明文（待解密）</param>
47         /// <param name="key">密文</param>
48         /// <returns></returns>
49         public static string AesDecrypt(string str, string key)
50         {
51             if (string.IsNullOrEmpty(str))
52                 return null;
53             Byte[] toEncryptArray = Convert.FromBase64String(str);
54 
55             RijndaelManaged rm = new RijndaelManaged
56             {
57                 Key = Encoding.UTF8.GetBytes(key),
58                 Mode = CipherMode.ECB,
59                 Padding = PaddingMode.PKCS7
60             };
61 
62             ICryptoTransform cTransform = rm.CreateDecryptor();
63             Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
64 
65             return Encoding.UTF8.GetString(resultArray);
66         }
67     }
68 }