(Node.js) POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

Note: This example requires Chilkat v11.0.0 or greater.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var mailman = new chilkat.MailMan();

    // Set the POP3 server's hostname
    mailman.MailHost = "pop.example.com";

    // Set the POP3 login/password.
    mailman.PopUsername = "myLogin";
    mailman.PopPassword = "myPassword";

    var stUidls = new chilkat.StringTable();
    success = mailman.FetchUidls(stUidls);
    if (success == false) {
        console.log(mailman.LastErrorText);
        return;
    }

    var email = new chilkat.Email();
    var cert = new chilkat.Cert();

    var count = stUidls.Count;
    var i = 0;
    while (i < count) {
        // Download the full email.
        success = mailman.FetchByUidl(stUidls.StringAt(i),false,0,email);
        if (success == false) {
            console.log(mailman.LastErrorText);
            return;
        }

        console.log(i);
        console.log("From: " + email.From);
        console.log("Subject: " + email.Subject);

        // The security layers of signed and/or encrypted emails
        // are automatically "unwrapped" when loaded into
        // a Chilkat email object.
        // An application only needs to check to see if an email
        // was received signed or encrypted, and then examine
        // the success/failure.  For example:
        if (email.ReceivedSigned == true) {

            console.log("This email was signed.");

            // Check to see if the signatures were verified.
            if (email.SignaturesValid == true) {
                console.log("Digital signature(s) verified.");
                console.log("Signer: " + email.SignedBy);

                success = email.LastSignerCert(0,cert);
                if (success == false) {
                    console.log(email.LastErrorText);
                    return;
                }

                console.log("Signing cert: " + cert.SubjectCN);
            }

        }
        else {
            console.log("Digital signature verification failed.");
        }

        i = i+1;
    }

    mailman.Pop3EndSession();

}

chilkatExample();