說一說ASP.NET web.config 加密及解密方法 （代碼）

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1. /// <summary>  
2.    /// 保護web.config的加密和解密  
3.    /// </summary>  
4.    public class ProtectHelper  
5.    {  
6.        /// <summary>  
7.        /// 解密  
8.        /// </summary>  
9.        /// <param name="pToDecrypt">加密連接字串</param>  
10.        /// <param name="sKey">自訂密鑰</param>  
11.        /// <returns>解密字串</returns>  
12.        public static string UnProtectSection(string pToDecrypt, string sKey)  
13.        {  
14.            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);  
15.            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())  
16.            {  
17.                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  
18.                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  
19.                System.IO.MemoryStream ms = new System.IO.MemoryStream();  
20.                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))  
21.                {  
22.                    cs.Write(inputByteArray, 0, inputByteArray.Length);  
23.                    cs.FlushFinalBlock();  
24.                    cs.Close();  
25.                }  
26.                string str = Encoding.UTF8.GetString(ms.ToArray());  
27.                ms.Close();  
28.                return str;  
29.            }  
30.        }  
31.   
32.        /// <summary>  
33.        /// 加密  
34.        /// </summary>  
35.        /// <param name="pToEncrypt">連接字串</param>  
36.        /// <param name="sKey">自訂密鑰</param>  
37.        /// <returns>加密字串</returns>  
38.        public static string ProtectSection(string pToEncrypt, string sKey)  
39.        {  
40.            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())  
41.            {  
42.                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);  
43.                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  
44.                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  
45.                System.IO.MemoryStream ms = new System.IO.MemoryStream();  
46.                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))  
47.                {  
48.                    cs.Write(inputByteArray, 0, inputByteArray.Length);  
49.                    cs.FlushFinalBlock();  
50.                    cs.Close();  
51.                }  
52.                string str = Convert.ToBase64String(ms.ToArray());  
53.                ms.Close();  
54.                return str;  
55.            }  
56.        }  
57.    }