using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(AESCryptHelper.PasswordDecrypt("DHl7K0leVVzV9Y8DVXyV3Q=="));

        Console.WriteLine(AESCryptHelper.PasswordEncrypt("0714253895"));

    }

}

​

public class AESCryptHelper

{

    public static string AES_PublicKey = "u?#c%34m8f@M4*^C%1I1";

    public static string PasswordDecrypt(string textToDecrypt)

    {

        RijndaelManaged rijndaelCipher = new RijndaelManaged();

        rijndaelCipher.Mode = CipherMode.CBC;

        rijndaelCipher.Padding = PaddingMode.PKCS7;

        rijndaelCipher.KeySize = 0x80;

        rijndaelCipher.BlockSize = 0x80;

        byte[] encryptedData = Convert.FromBase64String(textToDecrypt);

        byte[] pwdBytes = Encoding.UTF8.GetBytes(AES_PublicKey);

        byte[] keyBytes = new byte[0x10];

        int len = pwdBytes.Length;

        if (len > keyBytes.Length)

        {

            len = keyBytes.Length;

        }

​

        Array.Copy(pwdBytes, keyBytes, len);

        rijndaelCipher.Key = keyBytes;

        rijndaelCipher.IV = keyBytes;

        byte[] plainText = rijndaelCipher.CreateDecryptor().TransformFinalBlock(encryptedData, 0, encryptedData.Length);

        return Encoding.UTF8.GetString(plainText);

    }

​

    public static string PasswordEncrypt(string textToEncrypt)

    {

        RijndaelManaged rijndaelCipher = new RijndaelManaged();

        rijndaelCipher.Mode = CipherMode.CBC;

        rijndaelCipher.Padding = PaddingMode.PKCS7;

        rijndaelCipher.KeySize = 0x80;

        rijndaelCipher.BlockSize = 0x80;

        byte[] pwdBytes = Encoding.UTF8.GetBytes(AES_PublicKey);

        byte[] keyBytes = new byte[0x10];

        int len = pwdBytes.Length;

        if (len > keyBytes.Length)

        {

            len = keyBytes.Length;

        }

​

        Array.Copy(pwdBytes, keyBytes, len);

        rijndaelCipher.Key = keyBytes;

        rijndaelCipher.IV = keyBytes;

        ICryptoTransform transform = rijndaelCipher.CreateEncryptor();

        byte[] plainText = Encoding.UTF8.GetBytes(textToEncrypt);

        return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));

    }

}