using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Xml.Linq;

namespace XmlEncrypt

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        //Load Button

        private void button1_Click(object sender, EventArgs e)

        {

            OpenFileDialog file = new OpenFileDialog();

            file.Filter = "XML文件|*.xml";

            file.RestoreDirectory = true;

            if (file.ShowDialog() == DialogResult.OK)

            {

                LoadXML(file.FileName.ToString());

            }

        }

        // Save Button

        private void SaveButton_Click(object sender, EventArgs e)

        {

            OpenFileDialog file = new OpenFileDialog();

            file.Filter = "XML文件|*.xml";

            file.RestoreDirectory = true;

            if (file.ShowDialog() == DialogResult.OK)

            {

                SaveXML(file.FileName.ToString());

            }

        }

        private void LoadXML(string path)

        {

            XmlTextBox.Clear();

            XmlTextBox.Text = DecrtyptLoadXML(path);

        }

        private void SaveXML(string path) {

            EncrtyptSaveXML(path);

        }

        //保存加密文件

        private void EncrtyptSaveXML(string xmlpath)

        {

            string xmlData = XmlTextBox.Text;

            string xxx = Encrypt(xmlData);

            StreamWriter writer;

            writer = File.CreateText(xmlpath);

            writer.Write(xxx);

            writer.Close();

        }

        //读取加密文件

        public string DecrtyptLoadXML(string xmlpath) {

            StreamReader sReader = File.OpenText(xmlpath);

            string xmlData = sReader.ReadToEnd();

            sReader.Close();

            string xxx = Decrypt(xmlData);

            return xxx;

        }

        //加密

        private string Encrypt(string toE)

        {

            if (KeyBox.Text != "")

            {

                byte[] keyArray = UTF8Encoding.UTF8.GetBytes(KeyBox.Text);

                RijndaelManaged rDel = new RijndaelManaged();

                rDel.Key = keyArray;

                rDel.Mode = CipherMode.ECB;

                rDel.Padding = PaddingMode.PKCS7;

                ICryptoTransform cTransform = rDel.CreateEncryptor();

                byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toE);

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

                return Convert.ToBase64String(resultArray, , resultArray.Length);

            }

            else

                return toE;

        }

        //解密

        private string Decrypt(string toD)

        {

            if (KeyBox.Text != "")

            {

                //加密和解密采用相同的key,具体值自己填，但是必须为32位

                byte[] keyArray = UTF8Encoding.UTF8.GetBytes(KeyBox.Text);

                RijndaelManaged rDel = new RijndaelManaged();

                try

                {

                    rDel.Key = keyArray;

                }

                catch

                {

                    return "密钥长度错误";

                }

                rDel.Mode = CipherMode.ECB;

                rDel.Padding = PaddingMode.PKCS7;

                ICryptoTransform cTransform = rDel.CreateDecryptor();

                byte[] toEncryptArray;

                byte[] resultArray;

                try

                {

                    toEncryptArray = Convert.FromBase64String(toD);

                    resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);

                }

                catch

                {

                    return "密钥错误";

                }

                return UTF8Encoding.UTF8.GetString(resultArray);

            }

            else

                return toD;

        }

    }

}