C\#간단 한 암호 화 클래스 인 스 턴 스

public static class EncryptAndDecrypt
     {
         //  
         public static string Encrypt(string input)
         {
             //   
             string saltValue = "saltValue";
             //    
             string pwdValue = "pwdValue";
             byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(input);
             byte[] salt = System.Text.UTF8Encoding.UTF8.GetBytes(saltValue);
             // AesManaged -       (AES)         
             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged();
             // Rfc2898DeriveBytes -        HMACSHA1         ，              (PBKDF2 -              )
             //         salt     
             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt);
             /**/
             /*
          * AesManaged.BlockSize -         （  ：bit）
          * AesManaged.LegalBlockSizes -           （  ：bit）
          * AesManaged.KeySize -          （  ：bit）
          * AesManaged.LegalKeySizes -            （  ：bit）
          * AesManaged.Key -        
          * AesManaged.IV -          
          * Rfc2898DeriveBytes.GetBytes(int              ) -     
          */
             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
             aes.KeySize = aes.LegalKeySizes[0].MaxSize;
             aes.Key = rfc.GetBytes(aes.KeySize / 8);
             aes.IV = rfc.GetBytes(aes.BlockSize / 8);
             //      Key          IV          
             System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor();
             //        
             System.IO.MemoryStream encryptStream = new System.IO.MemoryStream();
             //         （encryptStream）     （encryptTransform）   
             System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream
                 (encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write);
             //             CryptoStream （       ）
             encryptor.Write(data, 0, data.Length);
             encryptor.Close();
             //                 ，  Base64          
             string encryptedString = Convert.ToBase64String(encryptStream.ToArray());
             return encryptedString;
         }

 
         #region silverlight    
         /**/
         /// <summary>
         ///     
         /// </summary>
         /// <param name="input">       </param>
         /// <returns>       </returns>
         public static string Decrypt(string input)
         {
             //   （          ）
             string saltValue = "saltValue";
             //    （          ）
             string pwdValue = "pwdValue";
             byte[] encryptBytes = Convert.FromBase64String(input);
             byte[] salt = Encoding.UTF8.GetBytes(saltValue);
             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged();
             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt);
             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
             aes.KeySize = aes.LegalKeySizes[0].MaxSize;
             aes.Key = rfc.GetBytes(aes.KeySize / 8);
             aes.IV = rfc.GetBytes(aes.BlockSize / 8);
             //      Key          IV          
             System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor();
             //        
             MemoryStream decryptStream = new MemoryStream();
             //         （decryptStream）     （decryptTransform）   
             System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(
                 decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write);
             //             CryptoStream （       ）
             decryptor.Write(encryptBytes, 0, encryptBytes.Length);
             decryptor.Close();
             //                
             byte[] decryptBytes = decryptStream.ToArray();
             string decryptedString = UTF8Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);
             return decryptedString;
         }
         #endregion
     }