Java Requires Chilkat v11.0.0+

IMAP Download and Verify Signed (S/MIME) Email

See more IMAP Examples

Demonstrates how to download and verify digitally signed S/MIME email. Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;
import com.chilkatsoft.chilkat2.Imap;
import com.chilkatsoft.chilkat2.MessageSet;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Imap imap = new Imap();

        // Connect to an IMAP server.
        // Use TLS
        imap.setSsl(true);
        imap.setPort(993);
        try {
            imap.connect("imap.example.com");

            imap.login("myLogin", "myPassword");

            // Select an IMAP mailbox
            imap.selectMailbox("Inbox");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // We can choose to fetch UIDs or sequence numbers.
        boolean fetchUids = true;

        // Get the message IDs of all the emails in the mailbox
        MessageSet messageSet = new MessageSet();
        try {
            imap.queryMbx("ALL", fetchUids, messageSet);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Email email = new Email();
        Cert cert = new Cert();

        int i = 0;
        while (i < messageSet.getCount()) {
            String uid = messageSet.getId(i);
            System.out.println("uid: " + uid);

            try {
                imap.fetchEmail(false, uid, true, email);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
                return;
            }

            // 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.getReceivedSigned()) {
                System.out.println("This email was signed.");

                // Check to see if the signatures were verified.
                if (email.getSignaturesValid()) {
                    System.out.println("Digital signature(s) verified.");
                    System.out.println("Signer: " + email.getSignedBy());

                    // Get the certificate used for signing.

                    try {
                        email.lastSignerCert(0, cert);
                        System.out.println("Signing cert: " + cert.getSubjectCN());
                    } catch (ChilkatException e) {
                        System.out.println("Failed to get signing certificate object.");
                    }
                } else {
                    System.out.println("Digital signature verification failed.");
                }
            }

            i = i + 1;
        }

        // Disconnect from the IMAP server.
        imap.disconnect();
    }
}