// refer https://www.cnblogs.com/lzrabbit/p/3639503.html

// refer https://dotnetfiddle.net/n4g7y4

using System;

using System.Security.Cryptography;

using System.Text;

using System.Linq;

public class Program

{

    public static void Main()

    {       

        Console.WriteLine("Hello World");

        String strWillEncrypt = "itc111010brvs90v@8c93cc03be774fb390a58b92f5d76579@1234@1593679902";

        String derivedKey = "cfb2b699a0de64d2b819cc8a42b90f69";

        String encryptData = AesEncrypt(strWillEncrypt, derivedKey);

        Console.WriteLine("strWillEncrypt.Length = {0}", strWillEncrypt.Length);

        Console.WriteLine(encryptData);

    }

    public static String AesEncrypt(String str, String key)

    {

        if (string.IsNullOrEmpty(str)) return null;

        Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);

        //Console.WriteLine("toEncryptArray.Length = {0}", toEncryptArray.Length);

        Byte[] theKey = HexStringToByteArray(key);

        //Console.WriteLine("theKey.Length = {0}", theKey.Length);

        System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged

        {

            //Key = Encoding.UTF8.GetBytes(key),

            Key = theKey,

            Mode = System.Security.Cryptography.CipherMode.ECB,

            //Padding = System.Security.Cryptography.PaddingMode.PKCS7

            Padding = System.Security.Cryptography.PaddingMode.PKCS7

        };

​

        System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();

        Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        //String ret = Convert.ToBase64String(resultArray, 0, resultArray.Length);

        String ret = bytesToHexStr(resultArray);

        //Console.WriteLine("password = {0}", ret);

        return ret;

    }   

    public static String bytesToHexStr(byte[] bytes)

    {

        char[] c = new char[bytes.Length * 2];

        byte b;

        for(int bx = 0, cx = 0; bx < bytes.Length; ++bx, ++cx) 

        {

            b = ((byte)(bytes[bx] >> 4));

            c[cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);

            b = ((byte)(bytes[bx] & 0x0F));

            c[++cx]=(char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);

        }

        return new String(c);

    }   

    public static byte[] HexStringToByteArray(String hex) {

        return Enumerable.Range(0, hex.Length)

                         .Where(x => x % 2 == 0)

                         .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))

                         .ToArray();

    }

}