Lua

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
-- separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
-- Cert and the 2nd is the PrivateKey.

local imap = chilkat.Imap.new()

imap.ssl = true
imap.port = 993

local success = imap:connect("imap.example.com")
if not success then
    print(imap.last_error_text)
    return
end

success = imap:login("user@example.com", "myPassword")
if not success then
    print(imap.last_error_text)
    return
end

-- Load the certificate and its private key from separate files.
local cert = chilkat.Cert.new()
success = cert:load_from_file("qa_data/smime.cer")
if not success then
    print(cert.last_error_text)
    return
end

local privKey = chilkat.PrivateKey.new()
success = privKey:load_pem_file("qa_data/smime_privkey.pem")
if not success then
    print(privKey.last_error_text)
    return
end

-- Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
success = imap:set_decrypt_cert2(cert, privKey)
if not success then
    print(imap.last_error_text)
    return
end

success = imap:disconnect()
if not success then
    print(imap.last_error_text)
    return
end