加解密方法

 1         /// <summary>
 2         /// 加密字符串：根据传入的字符串和密匙返回加密后的字串
 3       /// </summary>
 4         public static string Encrypt(string value, string key)
 5         {
 6             try
 7             {
 8                 key += "!@#$%^&*()";
 9                 Byte[] byteCrypt = { 0x10, 0x29, 38, 0x47, 0x56 };
10                 Byte[] byteKey = System.Text.Encoding.UTF8.GetBytes(key.Substring(0, 10));
11                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
12                 Byte[] inputByteArray = System.Text.Encoding.UTF8.GetBytes(value);
13                 MemoryStream ms = new MemoryStream();
14                 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byteKey, byteCrypt), CryptoStreamMode.Write);
15                 cs.Write(inputByteArray, 0, inputByteArray.Length);
16                 cs.FlushFinalBlock();
17                 return Convert.ToBase64String(ms.ToArray());
18             }
19             catch (Exception ex)
20             {
21                 throw ex;
22             }
23         }
24 
25         /// <summary>
26         /// 加密字符串：根据传入的字符串和密匙返回加密后的字串
27       /// </summary>
28         public static string Encrypt(string value)
29         {
30             return Encrypt(value, string.Empty);
31         }
32 
33         /// <summary>
34         /// 解密字符串：根据传入的字符串和密匙返回解密后的字串
35       /// </summary>
36         public static string Decrypt(string value, string key)
37         {
38             try
39             {
40                 key += "!@#$%^&*()";
41                 Byte[] byteCrypt = { 0x10, 0x29, 38, 0x47, 0x56 };
42                 Byte[] byteKey = System.Text.Encoding.UTF8.GetBytes(key.Substring(0, 10));
43                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
44                 Byte[] inputByteArray = Convert.FromBase64String(value);
45                 MemoryStream ms = new MemoryStream();
46                 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byteKey, byteCrypt), CryptoStreamMode.Write);
47                 cs.Write(inputByteArray, 0, inputByteArray.Length);
48                 cs.FlushFinalBlock();
49                 System.Text.Encoding encoding = System.Text.Encoding.UTF8;
50                 return encoding.GetString(ms.ToArray());
51             }
52             catch (Exception ex)
53             {
54                 throw ex;
55             }
56         }
57 
58         /// <summary>
59         /// 解密字符串：根据传入的字符串和密匙返回解密后的字串
60       /// </summary>
61         public static string Decrypt(string value)
62         {
63             return Decrypt(value, string.Empty);
64         }