/*
 * SecureBlackbox 2024 .NET Edition - Sample Project
 *
 * This sample project demonstrates the usage of SecureBlackbox in a 
 * simple, straightforward way. It is not intended to be a complete 
 * application. Error handling and other checks are simplified for clarity.
 *
 * www.nsoftware.com/secureblackbox
 *
 * This code is subject to the terms and conditions specified in the 
 * corresponding product license agreement which outlines the authorized 
 * usage and restrictions.
 * 
 */

using System;
using System.Windows.Forms;
using nsoftware.SecureBlackbox;

namespace PDFEncryptorDemo
{
    public class MainForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button btnBrowseSource;
        private System.Windows.Forms.Button btnBrowseDest;
        private System.Windows.Forms.Label lSource;
        private System.Windows.Forms.Label lDest;
        private System.Windows.Forms.TextBox tbSource;
        private System.Windows.Forms.TextBox tbDest;
        private System.Windows.Forms.GroupBox gbEncProps;
        private System.Windows.Forms.Label lEncryptionAlgorithm;
        private System.Windows.Forms.ComboBox cbEncryptionAlgorithm;
        private System.Windows.Forms.CheckBox cbEncryptMetadata;
        private System.Windows.Forms.RadioButton rbPasswordEncryption;
        private System.Windows.Forms.RadioButton rbPublicKeyEncryption;
        private System.Windows.Forms.TextBox tbPassword;
        private System.Windows.Forms.Label lCertificate;
        private System.Windows.Forms.Button btnBrowseCert;
        private System.Windows.Forms.TextBox tbCert;
        private System.Windows.Forms.Label lCertPassword;
        private System.Windows.Forms.TextBox tbCertPassword;
        private System.Windows.Forms.Button btnEncrypt;
        private System.Windows.Forms.Button btnCancel;
        private System.Windows.Forms.OpenFileDialog openPDFDialog;
        private System.Windows.Forms.SaveFileDialog savePDFDialog;
        private System.Windows.Forms.OpenFileDialog openCertDialog;
        private System.Windows.Forms.Label lInfo;
        private System.Windows.Forms.Label lPassword;

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public MainForm()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.tbSource = new System.Windows.Forms.TextBox();
            this.tbDest = new System.Windows.Forms.TextBox();
            this.btnBrowseSource = new System.Windows.Forms.Button();
            this.btnBrowseDest = new System.Windows.Forms.Button();
            this.lSource = new System.Windows.Forms.Label();
            this.lDest = new System.Windows.Forms.Label();
            this.gbEncProps = new System.Windows.Forms.GroupBox();
            this.lPassword = new System.Windows.Forms.Label();
            this.tbCertPassword = new System.Windows.Forms.TextBox();
            this.btnBrowseCert = new System.Windows.Forms.Button();
            this.lCertPassword = new System.Windows.Forms.Label();
            this.lCertificate = new System.Windows.Forms.Label();
            this.tbCert = new System.Windows.Forms.TextBox();
            this.tbPassword = new System.Windows.Forms.TextBox();
            this.rbPublicKeyEncryption = new System.Windows.Forms.RadioButton();
            this.rbPasswordEncryption = new System.Windows.Forms.RadioButton();
            this.cbEncryptMetadata = new System.Windows.Forms.CheckBox();
            this.cbEncryptionAlgorithm = new System.Windows.Forms.ComboBox();
            this.lEncryptionAlgorithm = new System.Windows.Forms.Label();
            this.btnEncrypt = new System.Windows.Forms.Button();
            this.btnCancel = new System.Windows.Forms.Button();
            this.openPDFDialog = new System.Windows.Forms.OpenFileDialog();
            this.savePDFDialog = new System.Windows.Forms.SaveFileDialog();
            this.openCertDialog = new System.Windows.Forms.OpenFileDialog();
            this.lInfo = new System.Windows.Forms.Label();
            this.gbEncProps.SuspendLayout();
            this.SuspendLayout();
            // 
            // tbSource
            // 
            this.tbSource.Location = new System.Drawing.Point(8, 75);
            this.tbSource.Name = "tbSource";
            this.tbSource.Size = new System.Drawing.Size(288, 21);
            this.tbSource.TabIndex = 1;
            // 
            // tbDest
            // 
            this.tbDest.Location = new System.Drawing.Point(8, 123);
            this.tbDest.Name = "tbDest";
            this.tbDest.Size = new System.Drawing.Size(288, 21);
            this.tbDest.TabIndex = 4;
            // 
            // btnBrowseSource
            // 
            this.btnBrowseSource.Location = new System.Drawing.Point(304, 72);
            this.btnBrowseSource.Name = "btnBrowseSource";
            this.btnBrowseSource.Size = new System.Drawing.Size(75, 25);
            this.btnBrowseSource.TabIndex = 2;
            this.btnBrowseSource.Text = "Browse...";
            this.btnBrowseSource.Click += new System.EventHandler(this.btnBrowseSource_Click);
            // 
            // btnBrowseDest
            // 
            this.btnBrowseDest.Location = new System.Drawing.Point(304, 120);
            this.btnBrowseDest.Name = "btnBrowseDest";
            this.btnBrowseDest.Size = new System.Drawing.Size(75, 25);
            this.btnBrowseDest.TabIndex = 5;
            this.btnBrowseDest.Text = "Browse...";
            this.btnBrowseDest.Click += new System.EventHandler(this.btnBrowseDest_Click);
            // 
            // lSource
            // 
            this.lSource.AutoSize = true;
            this.lSource.Location = new System.Drawing.Point(8, 57);
            this.lSource.Name = "lSource";
            this.lSource.Size = new System.Drawing.Size(83, 13);
            this.lSource.TabIndex = 0;
            this.lSource.Text = "Source PDF file:";
            // 
            // lDest
            // 
            this.lDest.AutoSize = true;
            this.lDest.Location = new System.Drawing.Point(8, 105);
            this.lDest.Name = "lDest";
            this.lDest.Size = new System.Drawing.Size(104, 13);
            this.lDest.TabIndex = 3;
            this.lDest.Text = "Destination PDF file:";
            // 
            // gbEncProps
            // 
            this.gbEncProps.Controls.Add(this.lPassword);
            this.gbEncProps.Controls.Add(this.tbCertPassword);
            this.gbEncProps.Controls.Add(this.btnBrowseCert);
            this.gbEncProps.Controls.Add(this.lCertPassword);
            this.gbEncProps.Controls.Add(this.lCertificate);
            this.gbEncProps.Controls.Add(this.tbCert);
            this.gbEncProps.Controls.Add(this.tbPassword);
            this.gbEncProps.Controls.Add(this.rbPublicKeyEncryption);
            this.gbEncProps.Controls.Add(this.rbPasswordEncryption);
            this.gbEncProps.Controls.Add(this.cbEncryptMetadata);
            this.gbEncProps.Controls.Add(this.cbEncryptionAlgorithm);
            this.gbEncProps.Controls.Add(this.lEncryptionAlgorithm);
            this.gbEncProps.Location = new System.Drawing.Point(8, 153);
            this.gbEncProps.Name = "gbEncProps";
            this.gbEncProps.Size = new System.Drawing.Size(368, 273);
            this.gbEncProps.TabIndex = 6;
            this.gbEncProps.TabStop = false;
            this.gbEncProps.Text = "Encryption properties";
            // 
            // lPassword
            // 
            this.lPassword.AutoSize = true;
            this.lPassword.Enabled = false;
            this.lPassword.Location = new System.Drawing.Point(40, 99);
            this.lPassword.Name = "lPassword";
            this.lPassword.Size = new System.Drawing.Size(57, 13);
            this.lPassword.TabIndex = 4;
            this.lPassword.Text = "Password:";
            // 
            // tbCertPassword
            // 
            this.tbCertPassword.Enabled = false;
            this.tbCertPassword.Location = new System.Drawing.Point(40, 243);
            this.tbCertPassword.Name = "tbCertPassword";
            this.tbCertPassword.PasswordChar = '*';
            this.tbCertPassword.Size = new System.Drawing.Size(128, 21);
            this.tbCertPassword.TabIndex = 11;
            // 
            // btnBrowseCert
            // 
            this.btnBrowseCert.Enabled = false;
            this.btnBrowseCert.Location = new System.Drawing.Point(278, 194);
            this.btnBrowseCert.Name = "btnBrowseCert";
            this.btnBrowseCert.Size = new System.Drawing.Size(75, 25);
            this.btnBrowseCert.TabIndex = 9;
            this.btnBrowseCert.Text = "Browse...";
            this.btnBrowseCert.Click += new System.EventHandler(this.btnBrowseCert_Click);
            // 
            // lCertPassword
            // 
            this.lCertPassword.AutoSize = true;
            this.lCertPassword.Enabled = false;
            this.lCertPassword.Location = new System.Drawing.Point(40, 227);
            this.lCertPassword.Name = "lCertPassword";
            this.lCertPassword.Size = new System.Drawing.Size(110, 13);
            this.lCertPassword.TabIndex = 10;
            this.lCertPassword.Text = "Certificate password:";
            // 
            // lCertificate
            // 
            this.lCertificate.AutoSize = true;
            this.lCertificate.Enabled = false;
            this.lCertificate.Location = new System.Drawing.Point(40, 179);
            this.lCertificate.Name = "lCertificate";
            this.lCertificate.Size = new System.Drawing.Size(113, 13);
            this.lCertificate.TabIndex = 7;
            this.lCertificate.Text = "Encryption certificate:";
            // 
            // tbCert
            // 
            this.tbCert.Enabled = false;
            this.tbCert.Location = new System.Drawing.Point(40, 197);
            this.tbCert.Name = "tbCert";
            this.tbCert.Size = new System.Drawing.Size(232, 21);
            this.tbCert.TabIndex = 8;
            // 
            // tbPassword
            // 
            this.tbPassword.Location = new System.Drawing.Point(40, 118);
            this.tbPassword.Name = "tbPassword";
            this.tbPassword.PasswordChar = '*';
            this.tbPassword.Size = new System.Drawing.Size(128, 21);
            this.tbPassword.TabIndex = 5;
            // 
            // rbPublicKeyEncryption
            // 
            this.rbPublicKeyEncryption.Location = new System.Drawing.Point(16, 151);
            this.rbPublicKeyEncryption.Name = "rbPublicKeyEncryption";
            this.rbPublicKeyEncryption.Size = new System.Drawing.Size(304, 24);
            this.rbPublicKeyEncryption.TabIndex = 6;
            this.rbPublicKeyEncryption.Text = "Public key encryption";
            this.rbPublicKeyEncryption.CheckedChanged += new System.EventHandler(this.rbPasswordEncryption_CheckedChanged);
            // 
            // rbPasswordEncryption
            // 
            this.rbPasswordEncryption.Checked = true;
            this.rbPasswordEncryption.Location = new System.Drawing.Point(16, 72);
            this.rbPasswordEncryption.Name = "rbPasswordEncryption";
            this.rbPasswordEncryption.Size = new System.Drawing.Size(272, 24);
            this.rbPasswordEncryption.TabIndex = 3;
            this.rbPasswordEncryption.TabStop = true;
            this.rbPasswordEncryption.Text = "Password encryption";
            this.rbPasswordEncryption.CheckedChanged += new System.EventHandler(this.rbPasswordEncryption_CheckedChanged);
            // 
            // cbEncryptMetadata
            // 
            this.cbEncryptMetadata.AutoSize = true;
            this.cbEncryptMetadata.Checked = true;
            this.cbEncryptMetadata.CheckState = System.Windows.Forms.CheckState.Checked;
            this.cbEncryptMetadata.Location = new System.Drawing.Point(184, 40);
            this.cbEncryptMetadata.Name = "cbEncryptMetadata";
            this.cbEncryptMetadata.Size = new System.Drawing.Size(162, 17);
            this.cbEncryptMetadata.TabIndex = 2;
            this.cbEncryptMetadata.Text = "Encrypt document metadata";
            // 
            // cbEncryptionAlgorithm
            // 
            this.cbEncryptionAlgorithm.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cbEncryptionAlgorithm.Items.AddRange(new object[] {
            "RC4/40 bits (Acrobat 4)",
            "RC4/128 bits (Acrobat 5)",
            "AES/128 bits (Acrobat 6, 7)",
            "AES/256 bits (Acrobat 9)",
            "AES/256 bits (Acrobat X)"});
            this.cbEncryptionAlgorithm.Location = new System.Drawing.Point(16, 40);
            this.cbEncryptionAlgorithm.Name = "cbEncryptionAlgorithm";
            this.cbEncryptionAlgorithm.Size = new System.Drawing.Size(152, 21);
            this.cbEncryptionAlgorithm.TabIndex = 1;
            // 
            // lEncryptionAlgorithm
            // 
            this.lEncryptionAlgorithm.AutoSize = true;
            this.lEncryptionAlgorithm.Location = new System.Drawing.Point(16, 24);
            this.lEncryptionAlgorithm.Name = "lEncryptionAlgorithm";
            this.lEncryptionAlgorithm.Size = new System.Drawing.Size(109, 13);
            this.lEncryptionAlgorithm.TabIndex = 0;
            this.lEncryptionAlgorithm.Text = "Encryption algorithm:";
            // 
            // btnEncrypt
            // 
            this.btnEncrypt.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.btnEncrypt.Location = new System.Drawing.Point(125, 435);
            this.btnEncrypt.Name = "btnEncrypt";
            this.btnEncrypt.Size = new System.Drawing.Size(75, 25);
            this.btnEncrypt.TabIndex = 7;
            this.btnEncrypt.Text = "Encrypt";
            this.btnEncrypt.Click += new System.EventHandler(this.btnEncrypt_Click);
            // 
            // btnCancel
            // 
            this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.btnCancel.Location = new System.Drawing.Point(205, 435);
            this.btnCancel.Name = "btnCancel";
            this.btnCancel.Size = new System.Drawing.Size(75, 25);
            this.btnCancel.TabIndex = 8;
            this.btnCancel.Text = "Cancel";
            this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
            // 
            // openPDFDialog
            // 
            this.openPDFDialog.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*";
            this.openPDFDialog.InitialDirectory = ".";
            // 
            // savePDFDialog
            // 
            this.savePDFDialog.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*";
            this.savePDFDialog.InitialDirectory = ".";
            // 
            // openCertDialog
            // 
            this.openCertDialog.Filter = "Raw X.509 certificate (*.cer, *.csr, *.crt)|*.CER;*.CSR;*.CRT|Base64-encoded X.50" +
    "9 certificate (*.pem)|*.PEM|PKCS#12 certificate (*.pfx, *.p12)|*.PFX; *.P12|All " +
    "files (*.*)|*.*";
            this.openCertDialog.InitialDirectory = ".";
            // 
            // lInfo
            // 
            this.lInfo.ForeColor = System.Drawing.SystemColors.Highlight;
            this.lInfo.Location = new System.Drawing.Point(8, 8);
            this.lInfo.Name = "lInfo";
            this.lInfo.Size = new System.Drawing.Size(371, 49);
            this.lInfo.TabIndex = 9;
            this.lInfo.Text = "This sample illustrates the use of PDFEncryptor component for encrypting PDF docu" +
    "ments. Please pick the encryption type and specify either encryption password or" +
    " certificate and then click \'Encrypt\'";
            this.lInfo.UseMnemonic = false;
            // 
            // MainForm
            // 
            this.AcceptButton = this.btnEncrypt;
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.CancelButton = this.btnCancel;
            this.ClientSize = new System.Drawing.Size(389, 467);
            this.Controls.Add(this.lInfo);
            this.Controls.Add(this.btnCancel);
            this.Controls.Add(this.btnEncrypt);
            this.Controls.Add(this.gbEncProps);
            this.Controls.Add(this.lDest);
            this.Controls.Add(this.lSource);
            this.Controls.Add(this.btnBrowseDest);
            this.Controls.Add(this.btnBrowseSource);
            this.Controls.Add(this.tbDest);
            this.Controls.Add(this.tbSource);
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "MainForm";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "PDF Encryptor demo";
            this.Load += new System.EventHandler(this.MainForm_Load);
            this.gbEncProps.ResumeLayout(false);
            this.gbEncProps.PerformLayout();
            this.ResumeLayout(false);
            this.PerformLayout();

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new MainForm());
        }

        private void btnBrowseSource_Click(object sender, System.EventArgs e)
        {
            openPDFDialog.FileName = tbSource.Text;
            if (openPDFDialog.ShowDialog() == DialogResult.OK)
                tbSource.Text = openPDFDialog.FileName;
        }

        private void btnBrowseDest_Click(object sender, System.EventArgs e)
        {
            savePDFDialog.FileName = tbDest.Text;
            if (savePDFDialog.ShowDialog() == DialogResult.OK)
                tbDest.Text = savePDFDialog.FileName;
        }

        private void btnBrowseCert_Click(object sender, System.EventArgs e)
        {
            openCertDialog.FileName = tbCert.Text;
            if (openCertDialog.ShowDialog() == DialogResult.OK)
                tbCert.Text = openCertDialog.FileName;
        }

        private void rbPasswordEncryption_CheckedChanged(object sender, System.EventArgs e)
        {
            tbPassword.Enabled = rbPasswordEncryption.Checked;
            lPassword.Enabled = rbPasswordEncryption.Checked;
            tbCert.Enabled = !rbPasswordEncryption.Checked;
            tbCertPassword.Enabled = !rbPasswordEncryption.Checked;
            btnBrowseCert.Enabled = !rbPasswordEncryption.Checked;
            lCertificate.Enabled = !rbPasswordEncryption.Checked;
            lCertPassword.Enabled = !rbPasswordEncryption.Checked;

            if (rbPasswordEncryption.Checked)
            {
                if (cbEncryptionAlgorithm.Items.Count == 4)
                    cbEncryptionAlgorithm.Items.Add("AES/256 bits (Acrobat X)");
            }
            else
            {
                if (cbEncryptionAlgorithm.Items.Count == 5)
                    cbEncryptionAlgorithm.Items.RemoveAt(4);
            }
        }

        public Certificate LoadCertificate(string file, string password)
        {
            Certificate cert = null;

            if (file.Length > 0)
            {
                try
                {
                    CertificateManager certmanager = new CertificateManager();

                    certmanager.ImportFromFile(file, password);

                    cert = certmanager.Certificate;
                }
                catch (Exception e)
                {
                    MessageBox.Show("Cannot load certificate!");
                }
            }

            return cert;
        }

        private void btnEncrypt_Click(object sender, System.EventArgs e)
        {
            using (PDFEncryptor PDFEncryptor = new PDFEncryptor())
            {
                try
                {
                    PDFEncryptor.InputFile = tbSource.Text;
                    PDFEncryptor.OutputFile = tbDest.Text;

                    if (rbPasswordEncryption.Checked)
                    {
                        PDFEncryptor.UserPassword = tbPassword.Text;
                        PDFEncryptor.OwnerPassword = tbPassword.Text;
                    }
                    else
                    {
                        PDFEncryptor.EncryptionCertificate = LoadCertificate(tbCert.Text, tbCertPassword.Text);
                    }

                    PDFEncryptor.EncryptMetadata = cbEncryptMetadata.Checked;

                    if (cbEncryptionAlgorithm.SelectedIndex <= 1)
                    {
                        PDFEncryptor.EncryptionAlgorithm = "RC4";
                        if (cbEncryptionAlgorithm.SelectedIndex == 1)
                            PDFEncryptor.Config("RC4KeyBits=40");
                        else
                            PDFEncryptor.Config("RC4KeyBits=128");
                    }
                    else if (cbEncryptionAlgorithm.SelectedIndex == 2)
                    {
                        PDFEncryptor.EncryptionAlgorithm = "AES128";
                    }
                    else if (cbEncryptionAlgorithm.SelectedIndex > 3)
                    {
                        PDFEncryptor.EncryptionAlgorithm = "AES256";
                        if (PDFEncryptor.EncryptionCertificate == null)
                        {
                            if (cbEncryptionAlgorithm.SelectedIndex == 3)
                                PDFEncryptor.Config("HardenedKeyGeneration=false");
                            else
                                PDFEncryptor.Config("HardenedKeyGeneration=true");
                        }
                    }

                    PDFEncryptor.Encrypt();

                    MessageBox.Show("PDF document successfully encrypted", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }

            this.Close();
        }

        private void MainForm_Load(object sender, System.EventArgs e)
        {
            cbEncryptionAlgorithm.SelectedIndex = 2;
        }

        private void btnCancel_Click(object sender, System.EventArgs e)
        {
            this.Close();
        }
    }
}