(Ruby) POP3 Verify Signed (S/MIME) Email

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

mailman = Chilkat::CkMailMan.new()

# Set the POP3 server's hostname
mailman.put_MailHost("pop.someMailServer.com")

# Set the POP3 login/password.
mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")

# sa is a CkStringArray
sa = mailman.GetUidls()
if (mailman.get_LastMethodSuccess() == false)
    print mailman.lastErrorText() + "\n";
    exit
end

i = 0
while i < sa.get_Count()

    uidl = sa.getString(i)

    # email is a CkEmail
    email = mailman.FetchEmail(uidl)
    if (mailman.get_LastMethodSuccess() == false)
        print mailman.lastErrorText() + "\n";

        exit
    end

    print email.ck_from() + "\n";
    print email.subject() + "\n";

    # 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.get_ReceivedSigned() == true)

        print "This email was signed." + "\n";

        # Check to see if the signatures were verified.
        if (email.get_SignaturesValid() == true)
            print "Digital signature(s) verified." + "\n";
            print "Signer: " + email.signedBy() + "\n";

            # The certificate used for signing may be obtained
            # by calling email.GetSignedByCert.

            # cert is a CkCert
            cert = email.GetSignedByCert()
            if (email.get_LastMethodSuccess() == false)
                print "Failed to get signing certificate object." + "\n";
            else
                print "Signing cert: " + cert.subjectCN() + "\n";

            end

        else
            print "Digital signature verification failed." + "\n";
        end

    end

    i = i + 1
end

mailman.Pop3EndSession()