C# AES128 암호화 복호화 소스

C# AES128 암호화 복호화 소스

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            String s = "TEST08";
            String key = "nfaator!plaeemo!";
            Console.WriteLine(Encrypt(s, key));
            Console.WriteLine(Decrypt(Encrypt(s, key), key));
        }
        private static string Encrypt(string s, string key)
        {
            StringBuilder sbResult = new StringBuilder();

            byte[] KeyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] EncryptArray = UTF8Encoding.UTF8.GetBytes(s);

            RijndaelManaged Rdel = new RijndaelManaged();
            Rdel.Mode = CipherMode.ECB;
            Rdel.Padding = PaddingMode.Zeros;
            Rdel.Key = KeyArray;

            ICryptoTransform CtransForm = Rdel.CreateEncryptor();
            byte[] ResultArray = CtransForm.TransformFinalBlock(EncryptArray, 0, EncryptArray.Length);

            foreach (byte b in ResultArray)
            {
                sbResult.AppendFormat("{0:x2}", b);
            }

            return sbResult.ToString();
        }

        private static string Decrypt(string s, string key)
        {
            byte[] KeyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] EncryptArray = HexToByte(s);

            RijndaelManaged Rdel = new RijndaelManaged();
            Rdel.Mode = CipherMode.ECB;
            Rdel.Padding = PaddingMode.Zeros;
            Rdel.Key = KeyArray;

            ICryptoTransform CtransForm = Rdel.CreateDecryptor();
            byte[] ResultArray = CtransForm.TransformFinalBlock(EncryptArray, 0, EncryptArray.Length);
            return UTF8Encoding.UTF8.GetString(ResultArray);
        }

        private static byte[] HexToByte(string msg)
        {
            msg = msg.Replace(" ", "");
            byte[] comBuffer = new byte[msg.Length / 2];
            for(int i = 0; i < msg.Length; i+=2)
            {
                try
                {
                    comBuffer[i / 2] = (byte)Convert.ToByte(msg.Substring(i, 2), 16);
                }
                catch(ArgumentOutOfRangeException ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }
            return comBuffer;
        }

    }

}

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