Lua Requires Chilkat v11.0.0+

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. Lua

local chilkat = require("chilkat")

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

-- The mailman object is used for receiving (POP3)
-- and sending (SMTP) email.
local mailman = chilkat.MailMan.new()

-- Set the POP3 server's hostname
mailman.mail_host = "pop.example.com"

-- Set the POP3 login/password.
mailman.pop_username = "myLogin"
mailman.pop_password = "myPassword"

-- If running on Microsoft Windows, the Chilkat mailman
-- will automatically search the registry-based certificate stores
-- for matching certificates and private keys required for
-- decryption.  However, on Linux, MAX OS X, and other
-- operating systems, no such thing exists.  Therefore, you'll
-- need to specify one or more PFX (.p12 / .pfx) files as
-- sources for locating the certs required for decyrption.
local success = mailman:add_pfx_source_file("/pfxFiles/certs_and_keys_1.pfx", "pfxPassword1")
if not success then
    print(mailman.last_error_text)
    return
end

success = mailman:add_pfx_source_file("/pfxFiles/certs_and_keys_2.pfx", "pfxPassword2")
if not success then
    print(mailman.last_error_text)
    return
end

-- ...
-- Note: On MS Windows, it is not required to provide PFX sources
-- if the needed certs and private keys are already installed
-- on the system (in the registry-based certificate stores).

-- Copy the all email from the user's POP3 mailbox
-- into a bundle object.  The email remains on the server.
local bundle = chilkat.EmailBundle.new()
local keepOnServer = true
local headersOnly = false
-- Irrelevent because we are NOT downloading headers-only
local numBodyLines = 0
success = mailman:fetch_all(keepOnServer, headersOnly, numBodyLines, bundle)
if not success then
    print(mailman.last_error_text)
    return
end

-- S/MIME security envelopes are automatically "unwrapped"
-- when a message is retrieved from the server. Signed emails are automatically verified, and
-- encrypted emails are automatically decrypted, restoring the email to the original state before
-- signing and/or encrypting. Information about the signing and encrypting certificates can be
-- retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert;
-- properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned,
-- ReceivedEncrypted).

-- Loop over the bundle
local email = chilkat.Email.new()
local i = 0
while i < bundle.message_count do
    bundle:email_at(i, email)

    print(email.from)
    print(email.subject)

    -- At this point, if the email was signed and/or encrypted, it is already "unwrapped", i.e.
    -- the email is already decrypted and in a state as if it were never signed or encrypted.
    -- You may check to see if the email was received encrypted or signed, and if so,
    -- whether it was successfully unwrapped and who signed or encrypted it:
    if email.received_encrypted then
        print("This email was encrypted when received.")
        if email.decrypted then
            print("This email was successfully decrypted.  It was encrypted by:")
            print(email.encrypted_by)
        else
            print("This email was not decrypted.")
        end
    end

    if email.received_signed then
        print("This email was signed when received.")
        if email.signatures_valid then
            print("The signature was verified.  It was signed by:")
            print(email.signed_by)
        else
            print("The signature verification failed.")
        end
    end

    -- The email's body, HTML body, attachments, etc.
    -- are decrypted and available just like any non-encrypted email.

    print("--")

    i = i + 1
end