C# AES 암호화 / 복호화 예제 소스 코드

C# AES 암호화 / 복호화 소스

using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

 

namespace AESWithJava.Con

{

    class Program

    {

        static void Main(string[] args)

        {

            String originalText = "plain text";

            String key = "key";

            String en = Encrypt(originalText, key);

            String de = Decrypt(en, key);

            Console.WriteLine("Original Text is " + originalText); 

            Console.WriteLine("Encrypted Text is " + en);

            Console.WriteLine( "Decrypted Text is " + de);

        }

 

        public static string Decrypt(string textToDecrypt, string key)

        {

            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            rijndaelCipher.Mode = CipherMode.CBC;

            rijndaelCipher.Padding = PaddingMode.PKCS7;

 

            rijndaelCipher.KeySize = 128;

            rijndaelCipher.BlockSize = 128;

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

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

            byte[] keyBytes = new byte[16];

            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 Encrypt(string textToEncrypt, string key)

        {

            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            rijndaelCipher.Mode = CipherMode.CBC;

            rijndaelCipher.Padding = PaddingMode.PKCS7;

 

            rijndaelCipher.KeySize = 128;

            rijndaelCipher.BlockSize = 128;

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

            byte[] keyBytes = new byte[16];

            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));

        }

 

    }

}