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

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

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() {

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

    var mailman = new chilkat.MailMan();
    var success;

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

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

    // sa: StringArray
    var sa = mailman.GetUidls();
    if (mailman.LastMethodSuccess == false) {
        console.log(mailman.LastErrorText);
        return;
    }

    // email: Email
    var email;
    var uidl;

    var i = 0;
    while (i < sa.Count) {

        uidl = sa.GetString(i);

        email = mailman.FetchEmail(uidl);
        if (mailman.LastMethodSuccess == false) {
            console.log(mailman.LastErrorText);

            return;
        }

        console.log(email.From);
        console.log(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);

                // The certificate used for signing may be obtained
                // by calling email.GetSignedByCert.
                // cert: Cert
                var cert;
                cert = email.GetSignedByCert();
                if (email.LastMethodSuccess == false) {
                    console.log("Failed to get signing certificate object.");
                }
                else {
                    console.log("Signing cert: " + cert.SubjectCN);

                }

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

        }

        i = i+1;
    }

    mailman.Pop3EndSession();

}

chilkatExample();