C# 암호화

EncryptionManager.cs

 

private void btnEncryption_Click(object sender, EventArgs e)

{

     this.txtPassWord.Text = PasswordEncryption();

}

private void btnDecryption_Click(object sender, EventArgs e)

{

     this.txtPassWord.Text = DecryptString(txtPassWord.Text, "ABCD");

}

private string PasswordEncryption()

{

     string EncryptedPassword = string.Empty;

     EncryptedPassword = EncryptionManager.EncryptString(txtPassWord.Text, "ABCD");

     return EncryptedPassword;

}

public string DecryptString(string InputText, string Password)

{

     RijndaelManaged RijndaelCipher = new RijndaelManaged();

     byte[] EncryptedData = Convert.FromBase64String(InputText);

     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 DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);

     memoryStream.Close();

     cryptoStream.Close();

     string DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);

     return DecryptedData;

}