/*
 * 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 CAdESVerifierDemo
{
    /// <summary>
    /// Summary description for frmMain.
    /// </summary>
    public class frmMain : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Label lbInputFile;
        private System.Windows.Forms.TextBox edInputFile;
        private System.Windows.Forms.Button sbBrowseInputFile;
        private System.Windows.Forms.OpenFileDialog dlgOpen;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;
        private System.Windows.Forms.Button btnVerify;

        private SignForm frmSign = null;
        private CAdESVerifier verifier;
        private TextBox edDataFile;
        private Button sbBrowseDataFile;
        private Label lDataFile;
        private SaveFileDialog dlgSave;
        private Label label5;
        private GroupBox groupBox4;
        private GroupBox groupBox3;
        public ListView lvTrustedCertificates;
        private ColumnHeader columnHeader3;
        private ColumnHeader columnHeader4;
        private Button btnRemoveTrusted;
        private Button btnAddTrusted;
        public CheckBox cbPerformRevocationCheck;
        private GroupBox groupBox2;
        public ListView lvKnownCertificates;
        private ColumnHeader columnHeader1;
        private ColumnHeader columnHeader2;
        private Button btnRemoveKnown;
        private Button bthAddKnown;
        public CheckBox cbIgnoreChainValidationErrors;
        public CheckBox cbForceCompleteChainValidation;
        private OpenFileDialog openDialogCert;
        public CheckBox cbOfflineMode;
        private CheckBox cbDetached;

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

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            verifier = new CAdESVerifier();
            verifier.OnSignatureFound += new CAdESVerifier.OnSignatureFoundHandler(SignatureFound);

            frmSign = new SignForm(verifier);  
        }

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

        private void SignatureFound(object s, CAdESVerifierSignatureFoundEventArgs e)
        {
            if (e.CertFound)
            {
                e.ValidateSignature = true;
                e.ValidateChain = true;
            }
            else
            {
                SignForm dlg = new SignForm(verifier);
                dlg.edIssuerRDN.Text = e.IssuerRDN;
                dlg.edSerialNumber.Text = BitConverter.ToString(e.SerialNumber);
                dlg.edSubjectKeyID.Text = BitConverter.ToString(e.SubjectKeyID);

                dlg.UpdateCertificates();

                if (dlg.ShowDialog() == DialogResult.OK)
                {
                    e.ValidateSignature = true;
                    e.ValidateChain = true;
                }
                else
                {
                    e.ValidateSignature = false;
                    e.ValidateChain = false;
                }
            }
        }

        #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.lbInputFile = new System.Windows.Forms.Label();
            this.edInputFile = new System.Windows.Forms.TextBox();
            this.sbBrowseInputFile = new System.Windows.Forms.Button();
            this.btnVerify = new System.Windows.Forms.Button();
            this.dlgOpen = new System.Windows.Forms.OpenFileDialog();
            this.edDataFile = new System.Windows.Forms.TextBox();
            this.sbBrowseDataFile = new System.Windows.Forms.Button();
            this.lDataFile = new System.Windows.Forms.Label();
            this.cbDetached = new System.Windows.Forms.CheckBox();
            this.dlgSave = new System.Windows.Forms.SaveFileDialog();
            this.label5 = new System.Windows.Forms.Label();
            this.groupBox4 = new System.Windows.Forms.GroupBox();
            this.groupBox3 = new System.Windows.Forms.GroupBox();
            this.lvTrustedCertificates = new System.Windows.Forms.ListView();
            this.columnHeader3 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.columnHeader4 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.btnRemoveTrusted = new System.Windows.Forms.Button();
            this.btnAddTrusted = new System.Windows.Forms.Button();
            this.cbPerformRevocationCheck = new System.Windows.Forms.CheckBox();
            this.groupBox2 = new System.Windows.Forms.GroupBox();
            this.lvKnownCertificates = new System.Windows.Forms.ListView();
            this.columnHeader1 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.columnHeader2 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.btnRemoveKnown = new System.Windows.Forms.Button();
            this.bthAddKnown = new System.Windows.Forms.Button();
            this.cbIgnoreChainValidationErrors = new System.Windows.Forms.CheckBox();
            this.cbForceCompleteChainValidation = new System.Windows.Forms.CheckBox();
            this.openDialogCert = new System.Windows.Forms.OpenFileDialog();
            this.cbOfflineMode = new System.Windows.Forms.CheckBox();
            this.groupBox4.SuspendLayout();
            this.groupBox3.SuspendLayout();
            this.groupBox2.SuspendLayout();
            this.SuspendLayout();
            // 
            // lbInputFile
            // 
            this.lbInputFile.Location = new System.Drawing.Point(8, 36);
            this.lbInputFile.Name = "lbInputFile";
            this.lbInputFile.Size = new System.Drawing.Size(60, 13);
            this.lbInputFile.TabIndex = 0;
            this.lbInputFile.Text = "Input file:";
            // 
            // edInputFile
            // 
            this.edInputFile.Location = new System.Drawing.Point(73, 33);
            this.edInputFile.Name = "edInputFile";
            this.edInputFile.Size = new System.Drawing.Size(347, 20);
            this.edInputFile.TabIndex = 1;
            // 
            // sbBrowseInputFile
            // 
            this.sbBrowseInputFile.Location = new System.Drawing.Point(426, 30);
            this.sbBrowseInputFile.Name = "sbBrowseInputFile";
            this.sbBrowseInputFile.Size = new System.Drawing.Size(75, 25);
            this.sbBrowseInputFile.TabIndex = 2;
            this.sbBrowseInputFile.Text = "Browse ...";
            this.sbBrowseInputFile.Click += new System.EventHandler(this.sbBrowseXMLFile_Click);
            // 
            // btnVerify
            // 
            this.btnVerify.Location = new System.Drawing.Point(655, 300);
            this.btnVerify.Name = "btnVerify";
            this.btnVerify.Size = new System.Drawing.Size(75, 25);
            this.btnVerify.TabIndex = 8;
            this.btnVerify.Text = "Verify";
            this.btnVerify.Click += new System.EventHandler(this.btnVerify_Click);
            // 
            // edDataFile
            // 
            this.edDataFile.Location = new System.Drawing.Point(73, 97);
            this.edDataFile.Name = "edDataFile";
            this.edDataFile.Size = new System.Drawing.Size(347, 20);
            this.edDataFile.TabIndex = 10;
            // 
            // sbBrowseDataFile
            // 
            this.sbBrowseDataFile.Location = new System.Drawing.Point(426, 94);
            this.sbBrowseDataFile.Name = "sbBrowseDataFile";
            this.sbBrowseDataFile.Size = new System.Drawing.Size(75, 25);
            this.sbBrowseDataFile.TabIndex = 11;
            this.sbBrowseDataFile.Text = "Browse ...";
            this.sbBrowseDataFile.Click += new System.EventHandler(this.sbBrowseDataFile_Click);
            // 
            // lDataFile
            // 
            this.lDataFile.Location = new System.Drawing.Point(8, 100);
            this.lDataFile.Name = "lDataFile";
            this.lDataFile.Size = new System.Drawing.Size(60, 13);
            this.lDataFile.TabIndex = 9;
            this.lDataFile.Text = "Output file:";
            // 
            // cbDetached
            // 
            this.cbDetached.AutoSize = true;
            this.cbDetached.Location = new System.Drawing.Point(11, 68);
            this.cbDetached.Name = "cbDetached";
            this.cbDetached.Size = new System.Drawing.Size(73, 17);
            this.cbDetached.TabIndex = 12;
            this.cbDetached.Text = "Detached";
            this.cbDetached.UseVisualStyleBackColor = true;
            this.cbDetached.CheckedChanged += new System.EventHandler(this.cbDetached_CheckedChanged);
            // 
            // label5
            // 
            this.label5.ForeColor = System.Drawing.SystemColors.Highlight;
            this.label5.Location = new System.Drawing.Point(5, 5);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(725, 13);
            this.label5.TabIndex = 71;
            this.label5.Text = "This sample shows processing of CAdES signatures. Please select a .p7s or .p7m fi" +
    "le, tune up validation settings, and click \'Verify\' when ready.";
            // 
            // groupBox4
            // 
            this.groupBox4.Controls.Add(this.cbOfflineMode);
            this.groupBox4.Controls.Add(this.groupBox3);
            this.groupBox4.Controls.Add(this.cbPerformRevocationCheck);
            this.groupBox4.Controls.Add(this.groupBox2);
            this.groupBox4.Controls.Add(this.cbIgnoreChainValidationErrors);
            this.groupBox4.Controls.Add(this.cbForceCompleteChainValidation);
            this.groupBox4.Location = new System.Drawing.Point(5, 125);
            this.groupBox4.Name = "groupBox4";
            this.groupBox4.Size = new System.Drawing.Size(725, 160);
            this.groupBox4.TabIndex = 72;
            this.groupBox4.TabStop = false;
            this.groupBox4.Text = "Validation settings  ";
            // 
            // groupBox3
            // 
            this.groupBox3.Controls.Add(this.lvTrustedCertificates);
            this.groupBox3.Controls.Add(this.btnRemoveTrusted);
            this.groupBox3.Controls.Add(this.btnAddTrusted);
            this.groupBox3.Location = new System.Drawing.Point(370, 60);
            this.groupBox3.Name = "groupBox3";
            this.groupBox3.Size = new System.Drawing.Size(350, 95);
            this.groupBox3.TabIndex = 17;
            this.groupBox3.TabStop = false;
            this.groupBox3.Text = "Trusted Certificates";
            // 
            // lvTrustedCertificates
            // 
            this.lvTrustedCertificates.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
            this.columnHeader3,
            this.columnHeader4});
            this.lvTrustedCertificates.HideSelection = false;
            this.lvTrustedCertificates.Location = new System.Drawing.Point(5, 20);
            this.lvTrustedCertificates.Name = "lvTrustedCertificates";
            this.lvTrustedCertificates.Size = new System.Drawing.Size(260, 70);
            this.lvTrustedCertificates.TabIndex = 4;
            this.lvTrustedCertificates.UseCompatibleStateImageBehavior = false;
            this.lvTrustedCertificates.View = System.Windows.Forms.View.Details;
            // 
            // columnHeader3
            // 
            this.columnHeader3.Text = "Serial";
            this.columnHeader3.Width = 90;
            // 
            // columnHeader4
            // 
            this.columnHeader4.Text = "Issuer";
            this.columnHeader4.Width = 160;
            // 
            // btnRemoveTrusted
            // 
            this.btnRemoveTrusted.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnRemoveTrusted.Location = new System.Drawing.Point(270, 51);
            this.btnRemoveTrusted.Name = "btnRemoveTrusted";
            this.btnRemoveTrusted.Size = new System.Drawing.Size(75, 25);
            this.btnRemoveTrusted.TabIndex = 3;
            this.btnRemoveTrusted.Text = "Remove";
            this.btnRemoveTrusted.Click += new System.EventHandler(this.btnRemoveTrusted_Click);
            // 
            // btnAddTrusted
            // 
            this.btnAddTrusted.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnAddTrusted.Location = new System.Drawing.Point(270, 20);
            this.btnAddTrusted.Name = "btnAddTrusted";
            this.btnAddTrusted.Size = new System.Drawing.Size(75, 25);
            this.btnAddTrusted.TabIndex = 2;
            this.btnAddTrusted.Text = "Add";
            this.btnAddTrusted.Click += new System.EventHandler(this.btnAddTrusted_Click);
            // 
            // cbPerformRevocationCheck
            // 
            this.cbPerformRevocationCheck.AutoSize = true;
            this.cbPerformRevocationCheck.Location = new System.Drawing.Point(411, 29);
            this.cbPerformRevocationCheck.Name = "cbPerformRevocationCheck";
            this.cbPerformRevocationCheck.Size = new System.Drawing.Size(148, 17);
            this.cbPerformRevocationCheck.TabIndex = 40;
            this.cbPerformRevocationCheck.Text = "Perform revocation check";
            // 
            // groupBox2
            // 
            this.groupBox2.Controls.Add(this.lvKnownCertificates);
            this.groupBox2.Controls.Add(this.btnRemoveKnown);
            this.groupBox2.Controls.Add(this.bthAddKnown);
            this.groupBox2.Location = new System.Drawing.Point(5, 60);
            this.groupBox2.Name = "groupBox2";
            this.groupBox2.Size = new System.Drawing.Size(350, 95);
            this.groupBox2.TabIndex = 16;
            this.groupBox2.TabStop = false;
            this.groupBox2.Text = "Known Certificates";
            // 
            // lvKnownCertificates
            // 
            this.lvKnownCertificates.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
            this.columnHeader1,
            this.columnHeader2});
            this.lvKnownCertificates.HideSelection = false;
            this.lvKnownCertificates.Location = new System.Drawing.Point(5, 20);
            this.lvKnownCertificates.Name = "lvKnownCertificates";
            this.lvKnownCertificates.Size = new System.Drawing.Size(260, 70);
            this.lvKnownCertificates.TabIndex = 4;
            this.lvKnownCertificates.UseCompatibleStateImageBehavior = false;
            this.lvKnownCertificates.View = System.Windows.Forms.View.Details;
            // 
            // columnHeader1
            // 
            this.columnHeader1.Text = "Serial";
            this.columnHeader1.Width = 90;
            // 
            // columnHeader2
            // 
            this.columnHeader2.Text = "Issuer";
            this.columnHeader2.Width = 160;
            // 
            // btnRemoveKnown
            // 
            this.btnRemoveKnown.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnRemoveKnown.Location = new System.Drawing.Point(270, 51);
            this.btnRemoveKnown.Name = "btnRemoveKnown";
            this.btnRemoveKnown.Size = new System.Drawing.Size(75, 25);
            this.btnRemoveKnown.TabIndex = 3;
            this.btnRemoveKnown.Text = "Remove";
            this.btnRemoveKnown.Click += new System.EventHandler(this.btnRemoveKnown_Click);
            // 
            // bthAddKnown
            // 
            this.bthAddKnown.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.bthAddKnown.Location = new System.Drawing.Point(270, 20);
            this.bthAddKnown.Name = "bthAddKnown";
            this.bthAddKnown.Size = new System.Drawing.Size(75, 25);
            this.bthAddKnown.TabIndex = 2;
            this.bthAddKnown.Text = "Add";
            this.bthAddKnown.Click += new System.EventHandler(this.bthAddKnown_Click);
            // 
            // cbIgnoreChainValidationErrors
            // 
            this.cbIgnoreChainValidationErrors.AutoSize = true;
            this.cbIgnoreChainValidationErrors.Location = new System.Drawing.Point(10, 29);
            this.cbIgnoreChainValidationErrors.Name = "cbIgnoreChainValidationErrors";
            this.cbIgnoreChainValidationErrors.Size = new System.Drawing.Size(162, 17);
            this.cbIgnoreChainValidationErrors.TabIndex = 41;
            this.cbIgnoreChainValidationErrors.Text = "Ignore chain validation errors";
            // 
            // cbForceCompleteChainValidation
            // 
            this.cbForceCompleteChainValidation.AutoSize = true;
            this.cbForceCompleteChainValidation.Location = new System.Drawing.Point(208, 29);
            this.cbForceCompleteChainValidation.Name = "cbForceCompleteChainValidation";
            this.cbForceCompleteChainValidation.Size = new System.Drawing.Size(176, 17);
            this.cbForceCompleteChainValidation.TabIndex = 43;
            this.cbForceCompleteChainValidation.Text = "Force complete chain validation";
            // 
            // openDialogCert
            // 
            this.openDialogCert.Filter = "PKCS#12 files (*.pfx)|*.pfx|All files (*.*)|*.*";
            this.openDialogCert.InitialDirectory = ".";
            this.openDialogCert.Title = "Please select a certificate to decrypt the document";
            // 
            // cbOfflineMode
            // 
            this.cbOfflineMode.AutoSize = true;
            this.cbOfflineMode.Location = new System.Drawing.Point(584, 29);
            this.cbOfflineMode.Name = "cbOfflineMode";
            this.cbOfflineMode.Size = new System.Drawing.Size(86, 17);
            this.cbOfflineMode.TabIndex = 50;
            this.cbOfflineMode.Text = "Offline Mode";
            // 
            // frmMain
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(734, 331);
            this.Controls.Add(this.groupBox4);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.cbDetached);
            this.Controls.Add(this.edDataFile);
            this.Controls.Add(this.sbBrowseDataFile);
            this.Controls.Add(this.lDataFile);
            this.Controls.Add(this.edInputFile);
            this.Controls.Add(this.btnVerify);
            this.Controls.Add(this.sbBrowseInputFile);
            this.Controls.Add(this.lbInputFile);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "frmMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "CAdES Verifier Demo";
            this.groupBox4.ResumeLayout(false);
            this.groupBox4.PerformLayout();
            this.groupBox3.ResumeLayout(false);
            this.groupBox2.ResumeLayout(false);
            this.ResumeLayout(false);
            this.PerformLayout();

        }
        #endregion

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

        private void sbBrowseXMLFile_Click(object sender, System.EventArgs e)
        {
            dlgOpen.InitialDirectory = Application.StartupPath;
            dlgOpen.FileName = edInputFile.Text;
            if (dlgOpen.ShowDialog() == DialogResult.OK)
                edInputFile.Text = dlgOpen.FileName;
        }

        private void btnVerify_Click(object sender, EventArgs e)
        {
            try
            {
                verifier.InputFile = edInputFile.Text;

                if (cbPerformRevocationCheck.Checked) 
                {
                    verifier.RevocationCheck = CAdESVerifierRevocationChecks.crcAuto;
                }
                else
                {
                    verifier.RevocationCheck = CAdESVerifierRevocationChecks.crcNone;
                }
                verifier.IgnoreChainValidationErrors = cbIgnoreChainValidationErrors.Checked;

                if (cbForceCompleteChainValidation.Checked)
                    verifier.Config("ForceCompleteChainValidation=true");
                else
                    verifier.Config("ForceCompleteChainValidation=false");

                verifier.OfflineMode = cbOfflineMode.Checked;

                verifier.Detached = cbDetached.Checked;
                if (cbDetached.Checked)
                {
                    verifier.DataFile = edDataFile.Text;
                }
                else
                {
                    verifier.OutputFile = edDataFile.Text;
                }

                verifier.Verify();

                switch (verifier.Signatures[0].SignatureValidationResult)
                {
                    case SignatureValidities.svtSignerNotFound:
                        {
                            MessageBox.Show("Signer not found", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            break;
                        }
                    case SignatureValidities.svtFailure:
                        {
                            MessageBox.Show("Signature verification failed", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            break;
                        }
                    case SignatureValidities.svtCorrupted:
                        {
                            MessageBox.Show("Signature is invalid", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            break;
                        }
                    default:
                        {
                            MessageBox.Show("Signature validated successfully", "", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            break;
                        }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void cbDetached_CheckedChanged(object sender, EventArgs e)
        {
            if (cbDetached.Checked)
            {
                lDataFile.Text = "Data file:";
            }
            else
            {
                lDataFile.Text = "Output file:";
            }
        }

        private void sbBrowseDataFile_Click(object sender, EventArgs e)
        {
            if (cbDetached.Checked)
            {
                dlgOpen.FileName = edDataFile.Text;
                if (dlgOpen.ShowDialog() == DialogResult.OK)
                    edDataFile.Text = dlgOpen.FileName;
            }
            else
            {
                dlgSave.FileName = edDataFile.Text;
                if (dlgSave.ShowDialog() == DialogResult.OK)
                    edDataFile.Text = dlgSave.FileName;
            }
        }

        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 string RequestPassword()
        {
            frmRequestPassword dlg = new frmRequestPassword();
            string s = "";
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                s = dlg.tbInput.Text;
            }
            dlg.Dispose();
            return s;
        }

        public void UpdateKnownCertificates()
        {
            lvKnownCertificates.BeginUpdate();
            lvKnownCertificates.Items.Clear();

            for (int i = 0; i < verifier.KnownCertificates.Count; i++)
            {
                string s = verifier.KnownCertificates[i].Issuer;
                if (s == "")
                    s = "<unknown>";

                ListViewItem Item = lvKnownCertificates.Items.Add(BitConverter.ToString(verifier.KnownCertificates[i].SerialNumber));
                Item.SubItems.Add(s);
            }

            lvKnownCertificates.EndUpdate();
        }

        public void UpdateTrustedCertificates()
        {
            lvTrustedCertificates.BeginUpdate();
            lvTrustedCertificates.Items.Clear();

            for (int i = 0; i < verifier.TrustedCertificates.Count; i++)
            {
                string s = verifier.TrustedCertificates[i].Issuer;
                if (s == "")
                    s = "<unknown>";

                ListViewItem Item = lvTrustedCertificates.Items.Add(BitConverter.ToString(verifier.TrustedCertificates[i].SerialNumber));
                Item.SubItems.Add(s);
            }

            lvTrustedCertificates.EndUpdate();
        }

        private void bthAddKnown_Click(object sender, EventArgs e)
        {
            openDialogCert.Title = "Select certificate file";
            openDialogCert.Filter = "PEM-encoded certificate (*.pem)|*.PEM|DER-encoded certificate (*.cer)|*.CER|PFX-encoded certificate (*.pfx)|*.PFX";
            if (openDialogCert.ShowDialog() == DialogResult.OK)
            {
                Certificate cert = LoadCertificate(openDialogCert.FileName, RequestPassword());
                verifier.KnownCertificates.Add(cert);

                UpdateKnownCertificates();
            }
        }

        private void btnRemoveKnown_Click(object sender, EventArgs e)
        {
            if (lvKnownCertificates.SelectedItems.Count > 0)
            {
                verifier.KnownCertificates.RemoveAt(lvKnownCertificates.SelectedItems[0].Index);

                UpdateKnownCertificates();
            }
        }

        private void btnAddTrusted_Click(object sender, EventArgs e)
        {
            openDialogCert.Title = "Select certificate file";
            openDialogCert.Filter = "PEM-encoded certificate (*.pem)|*.PEM|DER-encoded certificate (*.cer)|*.CER|PFX-encoded certificate (*.pfx)|*.PFX";
            if (openDialogCert.ShowDialog() == DialogResult.OK)
            {
                Certificate cert = LoadCertificate(openDialogCert.FileName, RequestPassword());
                verifier.TrustedCertificates.Add(cert);

                UpdateTrustedCertificates();
            }
        }

        private void btnRemoveTrusted_Click(object sender, EventArgs e)
        {
            if (lvTrustedCertificates.SelectedItems.Count > 0)
            {
                verifier.TrustedCertificates.RemoveAt(lvTrustedCertificates.SelectedItems[0].Index);

                UpdateTrustedCertificates();
            }
        }
    }
}