Lua Requires Chilkat v10.1.2+

Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. Lua

local chilkat = require("chilkat")

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

-- The mailman object is used for sending and receiving email.
local mailman = chilkat.MailMan.new()

-- Set the SMTP server.
mailman.smtp_host = "smtp.mymailserver.com"

-- Create a new email object
local email = chilkat.Email.new()

email.subject = "This email is signed"
email.body = "This is a digitally signed mail"
email.from = "Chilkat Admin <admin@chilkatsoft.com>"
local success = email:add_to("Chilkat Support", "support@chilkatsoft.com")

-- Indicate that the email should be sent signed.
email.send_signed = true

-- Load a PFX file into a certificate store object.
-- Then locate the certificate matching the  sender's email address,
-- and use it for signing.
-- (a PFX file may contain more than one certificate.)
local certStore = chilkat.CertStore.new()
-- The 1st argument is the path of the PFX file, the 2nd arg is the
-- PFX file's password:
success = certStore:load_pfx_file("/pfx_files/chilkatsoft_secret.pfx", "secret")
if not success then
    print(certStore.last_error_text)
    return
end

-- Find the certificate for the email address:
local jsonE = chilkat.JsonObject.new()
jsonE:update_string("email", "admin@chilkatsoft.com")

local cert = chilkat.Cert.new()
success = certStore:find_cert(jsonE, cert)
if not success then
    print(certStore.last_error_text)
    return
end

-- Alternatively, if a PFX file is known to contain a single certificate,
-- you may load it directly into a Chilkat certificate object.
-- This snippet of source code shows how:
local cert2 = chilkat.Cert.new()
-- The 1st argument is the filename, the 2nd arg is the
-- PFX file's password:
success = cert2:load_pfx_file("/pfx_files/chilkatsoft_secret.pfx", "secret")
if not success then
    print(cert2.last_error_text)
    return
end

-- This example will use the cert from the certStore...
success = email:set_signing_cert(cert)

-- Signed email can be sent in two different ways.
-- In a multipart/signed email, the signature is attached as a separate MIME part.
-- In an opaque email (signedData) the content of the email is encapsulated within the signature
-- and the email is sent as "application/pkcs7-mime".
-- Either should be fine, but some receiving systems might require one or the other..
mailman.opaque_signing = false

-- Send a signed email.
success = mailman:send_email(email)
if not success then
    print(mailman.last_error_text)
else
    -- The LastErrorText property provides information
    -- even when successful.
    print(mailman.last_error_text)
    print("Mail Sent!")
end