■ RSACryptoServiceProvider 클래스를 사용해 비대칭키 암호화하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// RSA 헬퍼 /// </summary> private RSAHelper rsaHelper = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); Load += Form_Load; this.processButton.Click += processButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 폼 로드시 처리하기 - Form_Load(sender, e) /// <summary> /// 폼 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Load(object sender, EventArgs e) { this.rsaHelper = new RSAHelper(); this.privateKeyTextBox.Text = this.rsaHelper.PrivateKey; this.publicKeyTextBox.Text = this.rsaHelper.PublicKey; } #endregion #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 = this.rsaHelper.Encrypt(this.plainTextTextBox.Text); this.cipherTextTextBox.Text = cipherText; string plainText = this.rsaHelper.Decrypt(cipherText); this.resultTextTextBox.Text = plainText; } #endregion } } |
▶ RSAHelper.cs
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using System; using System.Security.Cryptography; using System.Text; namespace TestProject { /// <summary> /// RSA 헬퍼 /// </summary> public class RSAHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// RSA 암호화 서비스 공급자 /// </summary> private RSACryptoServiceProvider provider; /// <summary> /// 개인 키 RSA 매개 변수 /// </summary> private RSAParameters privateKeyParameters; /// <summary> /// 개인 키 /// </summary> private string privateKey; /// <summary> /// 공개 키 RSA 매개 변수 /// </summary> private RSAParameters publicKeyParameters; /// <summary> /// 공개 키 /// </summary> private string publicKey; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 개인 키 - PrivateKey /// <summary> /// 개인 키 /// </summary> public string PrivateKey { get { return this.privateKey; } } #endregion #region 공개 키 - PublicKey /// <summary> /// 공개 키 /// </summary> public string PublicKey { get { return this.publicKey; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - RSAHelper() /// <summary> /// 생성자 /// </summary> public RSAHelper() { this.provider = new RSACryptoServiceProvider(); this.privateKeyParameters = RSA.Create().ExportParameters(true); this.provider.ImportParameters(this.privateKeyParameters); this.privateKey = this.provider.ToXmlString(true); this.publicKeyParameters = new RSAParameters(); this.publicKeyParameters.Modulus = this.privateKeyParameters.Modulus; this.publicKeyParameters.Exponent = this.privateKeyParameters.Exponent; this.provider.ImportParameters(this.publicKeyParameters); this.publicKey = this.provider.ToXmlString(false); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 암호화 하기 - Encrypt(plainText, publicKey) /// <summary> /// 암호화 하기 /// </summary> /// <param name="plainText">평문 텍스트</param> /// <param name="publicKey">공개 키</param> /// <returns>암호화 텍스트</returns> public static string Encrypt(string plainText, string publicKey) { RSACryptoServiceProvider provider = new RSACryptoServiceProvider(); provider.FromXmlString(publicKey); byte[] plainTextArray = Encoding.UTF8.GetBytes(plainText); byte[] cipherTextArray = provider.Encrypt(plainTextArray, false); return Convert.ToBase64String(cipherTextArray); } #endregion #region 복호화 하기 - Decrypt(cipherText, privateKey) /// <summary> /// 복호화 하기 /// </summary> /// <param name="cipherText">암호화 텍스트</param> /// <param name="privateKey">개인 키</param> /// <returns>평문 텍스트</returns> public static string Decrypt(string cipherText, string privateKey) { RSACryptoServiceProvider provider = new RSACryptoServiceProvider(); provider.FromXmlString(privateKey); byte[] cipherTextArray = Convert.FromBase64String(cipherText); byte[] plainTextArray = provider.Decrypt(cipherTextArray, false); string plainText = Encoding.UTF8.GetString(plainTextArray, 0, plainTextArray.Length); return plainText; } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Public #region 암호화 하기 - Encrypt(plainText) /// <summary> /// 암호화 하기 /// </summary> /// <param name="plainText">평문 텍스트</param> /// <returns>암호화 텍스트</returns> public string Encrypt(string plainText) { this.provider.FromXmlString(this.publicKey); byte[] plainTextArray = Encoding.UTF8.GetBytes(plainText); byte[] cipherTextArray = this.provider.Encrypt(plainTextArray, false); return Convert.ToBase64String(cipherTextArray); } #endregion #region 복호화 하기 - Decrypt(cipherText) /// <summary> /// 복호화 하기 /// </summary> /// <param name="cipherText">암호화 텍스트</param> /// <returns>평문 텍스트</returns> public string Decrypt(string cipherText) { this.provider.FromXmlString(this.privateKey); byte[] cipherTextArray = Convert.FromBase64String(cipherText); byte[] plainTextArray = this.provider.Decrypt(cipherTextArray, false); string plainText = Encoding.UTF8.GetString(plainTextArray, 0, plainTextArray.Length); return plainText; } #endregion } } |
