1. using System.IO;
    2. using System.Security.Cryptography;
    3. using System;
    5. public static class DataTableEncryptUtility
    6. {
    7.     private static byte[] Key = new byte[32] { 20, 112, 118, 231, 185, 252, 25, 22, 10, 214, 124, 12, 160, 84, 221, 225, 114, 92, 65, 32, 121, 7, 53, 234, 17, 175, 164, 189, 153, 170, 174, 110 };// 32 bytes for AES-256
    8.     private static byte[] IV = new byte[16] { 88, 22, 139, 249, 198, 81, 60, 252, 23, 191, 76, 129, 81, 79, 184, 27 }; // 16 bytes
    9.     public static string Encrypt(string plainText)
    10.     {
    11.         byte[] encrypted;
    12.         using (Aes aesAlg = Aes.Create())
    13.         {
    14.             aesAlg.Key = Key;
    15.             aesAlg.IV = IV;
    17.             ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
    19.             using (MemoryStream msEncrypt = new MemoryStream())
    20.             {
    21.                 using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
    22.                 {
    23.                     using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
    24.                     {
    25.                         swEncrypt.Write(plainText);
    26.                     }
    27.                     encrypted = msEncrypt.ToArray();
    28.                 }
    29.             }
    30.         }
    32.         return Convert.ToBase64String(encrypted);
    33.     }
    35.     public static string Decrypt(string cipherText)
    36.     {
    37.         byte[] cipherBytes = Convert.FromBase64String(cipherText);
    38.         using (Aes aesAlg = Aes.Create())
    39.         {
    40.             aesAlg.Key = Key;
    41.             aesAlg.IV = IV;
    43.             ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
    45.             using (MemoryStream msDecrypt = new MemoryStream(cipherBytes))
    46.             {
    47.                 using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
    48.                 {
    49.                     using (StreamReader srDecrypt = new StreamReader(csDecrypt))
    50.                     {
    51.                         return srDecrypt.ReadToEnd();
    52.                     }
    53.                 }
    54.             }
    55.         }
    56.     }
    57. }