■ RijndaelManaged 클래스 : 대칭키 암호화 사용하기

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TestProject.zip


MainForm.cs

 

 

using System;

using System.Windows.Forms;

 

namespace TestProject

{

    /// <summary>

    /// 메인 폼

    /// </summary>

    public partial class MainForm : Form

    {

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

        ////////////////////////////////////////////////////////////////////////////////////////// Public

 

        #region 생성자 - MainForm()

 

        /// <summary>

        /// 생성자

        /// </summary>

        public MainForm()

        {

            InitializeComponent();

 

            this.processButton.Click += processButton_Click;

        }

 

        #endregion

 

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method

        ////////////////////////////////////////////////////////////////////////////////////////// Private

 

        #region 암복호화 버튼 클릭시 처리하기 - processButton_Click(sender, e)

 

        /// <summary>

        /// 암복호화 버튼 클릭시 처리하기

        /// </summary>

        /// <param name="sender">이벤트 발생자</param>

        /// <param name="e">이벤트 인자</param>

        private void processButton_Click(object sender, EventArgs e)

        {

            string cipherText = AESHelper.Encrypt(this.plainTextTextBox.Text, this.passwordTextBox.Text);

 

            this.cipherTextTextBox.Text = cipherText;

 

            string plainText = AESHelper.Decrypt(cipherText, this.passwordTextBox.Text);

 

            this.resultTextTextBox.Text = plainText;

        }

 

        #endregion

    }

}

 

 

AESHelper.cs

 

 

using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

 

namespace TestProject

{

    /// <summary>

    /// AES 헬퍼

    /// </summary>

    public class AESHelper

    {

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method

        ////////////////////////////////////////////////////////////////////////////////////////// Static

        //////////////////////////////////////////////////////////////////////////////// Public

 

        #region 암호화 하기 - Encrypt(plainText, password)

 

        /// <summary>

        /// 암호화 하기

        /// </summary>

        /// <param name="plainText">평문 텍스트</param>

        /// <param name="password">패스워드</param>

        /// <returns>암호화 텍스트</returns>

        public static string Encrypt(string plainText, string password)

        {

            RijndaelManaged rijndaelManaged = new RijndaelManaged();

 

            byte[] saltArray       = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

            byte[] plaintTextArray = Encoding.Unicode.GetBytes(plainText);

 

            Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, saltArray, 100);

 

            ICryptoTransform cryptoTransform = rijndaelManaged.CreateEncryptor(rfc2898DeriveBytes.GetBytes(32),

                rfc2898DeriveBytes.GetBytes(16));

 

            MemoryStream memoryStream = new MemoryStream();

            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write);

 

            cryptoStream.Write(plaintTextArray, 0, plaintTextArray.Length);

 

            cryptoStream.FlushFinalBlock();

 

            byte[] cipherTextArray = memoryStream.ToArray();

 

            string cipherText = Convert.ToBase64String(cipherTextArray);

 

            memoryStream.Close();

            cryptoStream.Close();

 

            return cipherText;

        }

 

        #endregion

        #region 복호화 하기 - Decrypt(cipherText, password)

 

        /// <summary>

        /// 복호화 하기

        /// </summary>

        /// <param name="cipherText">암호화 텍스트</param>

        /// <param name="password">패스워드</param>

        /// <returns>평문 텍스트</returns>

        public static string Decrypt(string cipherText, string password)

        {

            RijndaelManaged rijndaelManaged = new RijndaelManaged();

 

            byte[] saltArray       = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

            byte[] cipherTextArray = Convert.FromBase64String(cipherText);

            byte[] plainTextArray  = new byte[cipherTextArray.Length];

 

            Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, saltArray, 100);

 

            ICryptoTransform cryptoTransform = rijndaelManaged.CreateDecryptor(rfc2898DeriveBytes.GetBytes(32),

                rfc2898DeriveBytes.GetBytes(16));

 

            MemoryStream memoryStream = new MemoryStream(cipherTextArray);

            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Read);

 

            int plainTextCount = cryptoStream.Read(plainTextArray, 0, plainTextArray.Length);

 

            string plainText = Encoding.Unicode.GetString(plainTextArray, 0, plainTextCount);

 

            memoryStream.Close();

            cryptoStream.Close();

 

            return plainText;

        }

 

        #endregion

    }

}

 

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Posted by 사용자 icodebroker
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