Add a Detached Signature (Separate Key, Header Control)

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Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

local chilkat = require("chilkat")

local mime = chilkat.Mime.new()
local success = mime:set_body_from_plain_text("This message will be signed.")
if not success then
    print(mime.last_error_text)
    return
end

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

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

-- Create a detached signature with separately supplied cert and private key, where the 3rd
-- argument controls whether the existing message header fields are transferred to the new outer
-- multipart/signed entity.
local transferHeaderFields = true
success = mime:add_detached_signature_pk2(cert, privKey, transferHeaderFields)
if not success then
    print(mime.last_error_text)
    return
end

success = mime:save_mime("qa_output/signed.eml")
if not success then
    print(mime.last_error_text)
    return
end

print("Detached signature added (headers transferred).")