1 public class Des
2 {
3 public static string Encrypt(string message, string key)
4 {
5 DES des = new DESCryptoServiceProvider();
6 des.Key = Encoding.UTF8.GetBytes(key);
7 des.IV = Encoding.UTF8.GetBytes(key);
8 //des.Mode = CipherMode.ECB;
9
10 byte[] inputByteArray = Encoding.UTF8.GetBytes(message);
11
12 System.IO.MemoryStream ms = new System.IO.MemoryStream();
13 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
14 cs.Write(inputByteArray, 0, inputByteArray.Length);
15 cs.FlushFinalBlock();
16 ms.Close();
17 StringBuilder ret = new StringBuilder();
18 foreach (byte b in ms.ToArray())
19 {
20 ret.AppendFormat("{0:X2}", b);
21 }
22 return ret.ToString();
23
24 }
25
26 //DES解密
27 public static string Decrypt(string content, string key)
28 {
29 try
30 {
31 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
32 // 密钥
33 provider.Key = Encoding.UTF8.GetBytes(key);
34 // 偏移量
35 provider.IV = Encoding.UTF8.GetBytes(key);
36 byte[] buffer = new byte[content.Length / 2];
37 for (int i = 0; i < (content.Length / 2); i++)
38 {
39 int num2 = Convert.ToInt32(content.Substring(i * 2, 2), 0x10);
40 buffer[i] = (byte)num2;
41 }
42 using(MemoryStream stream = new MemoryStream())
43 {
44 CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
45 stream2.Write(buffer, 0, buffer.Length);
46 stream2.FlushFinalBlock();
47 stream.Close();
48 return Encoding.UTF8.GetString(stream.ToArray());
49 }
50 }
51 catch (Exception) { return ""; }
52 }
53 }
