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1using System;
2using System.Text;
3using System.Security.Cryptography;
4
5namespace TripleDES
6{
7    class Program
8    {
9        private string encrypt(string clearText, string secretKey)
10        {
11            try
12            {
13                TripleDESCryptoServiceProvider tripleDESProvider = new TripleDESCryptoServiceProvider();
14                byte[] byteKey = Encoding.UTF8.GetBytes(secretKey.PadRight(24, '\0'));
15                if(byteKey.Length > 24)
16                {
17                    byte[] bytePass = new byte[24];
18                    Buffer.BlockCopy(byteKey, 0, bytePass, 0, 24);
19                    byteKey = bytePass;
20                }
21                byte[] byteText = Encoding.UTF8.GetBytes(clearText);
22
23                tripleDESProvider.Key = byteKey;
24                tripleDESProvider.Mode = CipherMode.ECB;
25
26                byte[] byteMessage = tripleDESProvider.CreateEncryptor().TransformFinalBlock(byteText, 0, byteText.Length);
27
28                return Convert.ToBase64String(byteMessage);
29            }
30            catch(Exception ex)
31            {
32                return ex.Message;
33            }
34        }
35
36        private string decrypt(string data, string secretKey)
37        {
38            try
39            {
40                byte[] byteData = Convert.FromBase64String(data);
41                byte[] byteKey = Encoding.UTF8.GetBytes(secretKey.PadRight(24, '\0'));
42                if (byteKey.Length > 24)
43                {
44                    byte[] bytePass = new byte[24];
45                    Buffer.BlockCopy(byteKey, 0, bytePass, 0, 24);
46                    byteKey = bytePass;
47                }
48
49                TripleDESCryptoServiceProvider tripleDESProvider = new TripleDESCryptoServiceProvider();
50                tripleDESProvider.Key = byteKey;
51                tripleDESProvider.Mode = CipherMode.ECB;
52
53                byte[] byteText = tripleDESProvider.CreateDecryptor().TransformFinalBlock(byteData, 0, byteData.Length);
54                return Encoding.UTF8.GetString(byteText);
55            }
56            catch(Exception ex)
57            {
58                return ex.Message;
59            }
60        }
61        static void Main(string[] args)
62        {
63            string clearText = "BSプレミアム20日放送";
64            string secretKey = "SecretKey";
65
66            string data = new TripleDES.Program().encrypt(clearText, secretKey);
67            clearText = new TripleDES.Program().decrypt(data, secretKey);
68
69            Console.WriteLine("Encrypted String: " + data);
70            Console.WriteLine(clearText);
71
72            Console.ReadLine();
73        }
74    }
75}