C# AES 256 암호화와 복호화 코드

        #region 암호화 & 복호화
        private string AESEncrypt256(string _text)
        {
            string Password = "jasmintime"; // 인증키
            RijndaelManaged RijndaelCipher = new RijndaelManaged();
            byte[] PlainText = Encoding.Unicode.GetBytes(_text);
            byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
            PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
            ICryptoTransform Encryptor = RijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));
            MemoryStream memoryStream = new MemoryStream();
 
            CryptoStream cryptoStream = new CryptoStream(memoryStream, Encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(PlainText, 0, PlainText.Length);
            cryptoStream.FlushFinalBlock();
 
            byte[] CipherBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
 
            return Convert.ToBase64String(CipherBytes);
        }
 
        private string AESDecrypte256(string _text)
        {
            string Password = "jasmintime"; // 인증키
            RijndaelManaged RijndaelCipher = new RijndaelManaged();
 
            byte[] EncryptedData = Convert.FromBase64String(_text);
            byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
            PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
            ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));
            MemoryStream memoryStream = new MemoryStream(EncryptedData);
            CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);
 
            byte[] PlainText = new byte[EncryptedData.Length];
            int DecrypedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);
            memoryStream.Close();
            cryptoStream.Close();
 
            return Encoding.Unicode.GetString(PlainText, 0, DecrypedCount);
        }
        #endregion