mHKteA5p

1using (RijndaelManaged rijndaelCipher = new RijndaelManaged())
2       {
3           PasswordDeriveBytes secretKey = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(key), Encoding.ASCII.GetBytes(salt));
4           using (ICryptoTransform encryptor = rijndaelCipher.CreateEncryptor(secretKey.GetBytes(32), secretKey.GetBytes(16)))
5           {
6               using (MemoryStream memoryStream = new MemoryStream())
7               {
8                   using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
9                   {
10                       cryptoStream.Write(plainText, 0, plainText.Length);
11                       cryptoStream.FlushFinalBlock();
12                       string base64 = Convert.ToBase64String(memoryStream.ToArray());
13
14                       // Generate a string that won't get screwed up when passed as a query string.
15                       string urlEncoded = HttpUtility.UrlEncode(base64);
16                       return urlEncoded;
17                   }
18               }
19           }
20       }
21   }
22	
23public string DecryptQueryString(string inputText, string key, string salt)
24   {
25       byte[] encryptedData = Convert.FromBase64String(inputText);
26       PasswordDeriveBytes secretKey = new PasswordDeriveBytes(Encoding.ASCII.GetBytes(key), Encoding.ASCII.GetBytes(salt));
27
28       using (RijndaelManaged rijndaelCipher = new RijndaelManaged())
29       {
30           using (ICryptoTransform decryptor = rijndaelCipher.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16)))
31           {
32               using (MemoryStream memoryStream = new MemoryStream(encryptedData))
33               {
34                   using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
35                   {
36                       byte[] plainText = new byte[encryptedData.Length];
37                       cryptoStream.Read(plainText, 0, plainText.Length);
38                       string utf8 = Encoding.UTF8.GetString(plainText);
39                       return utf8;
40                   }
41               }
42           }
43       }
44   }