C#, 문자열 암호화, 복호화 예제

C#, 문자열 암호화, 복호화 예제

 

     C# 에서 제공하는 클래스로 간단하게 DES 암호화, 복호화가 가능합니다.

참고로 암호화/복호화에 사용되는 키는 8글자여야 합니다.

 

 

 

public partial class Form1 : Form { //암호화 복호화 키 8글자 (필히 8자리여야 함) WATCrypt m_crypt = new WATCrypt("11111111"); public Form1() { InitializeComponent(); }   private void btnInDES_Click(object sender, EventArgs e) { // 암호화 txbOutput.Text = m_crypt.Encrypt(txbInput.Text); }   private void btnDeDES_Click(object sender, EventArgs e) { // 복호화 txbDeDES.Text = m_crypt.Decrypt(txbOutput.Text); }     } class WATCrypt { byte[] Skey = new byte[8]; public WATCrypt(string strKey) { Skey = ASCIIEncoding.ASCII.GetBytes(strKey); }   public string Encrypt(string p_data) { if (Skey.Length != 8) { throw (new Exception("Invalid key. Key length must be 8 byte.")); }   DESCryptoServiceProvider rc2 = new DESCryptoServiceProvider();   rc2.Key = Skey; rc2.IV = Skey;   MemoryStream ms = new MemoryStream(); CryptoStream cryStream = new CryptoStream(ms, rc2.CreateEncryptor(), CryptoStreamMode.Write); byte[] data = Encoding.UTF8.GetBytes(p_data.ToCharArray());   cryStream.Write(data, 0, data.Length); cryStream.FlushFinalBlock();   return Convert.ToBase64String(ms.ToArray()); }   public string Decrypt(string p_data) { DESCryptoServiceProvider rc2 = new DESCryptoServiceProvider();   rc2.Key = Skey; rc2.IV = Skey;   MemoryStream ms = new MemoryStream(); CryptoStream cryStream = new CryptoStream(ms, rc2.CreateDecryptor(), CryptoStreamMode.Write); byte[] data = Convert.FromBase64String(p_data);   cryStream.Write(data, 0, data.Length); cryStream.FlushFinalBlock();   return Encoding.UTF8.GetString(ms.GetBuffer()); } }