Lua

Check if a MIME Tree Contains Signed Parts

Demonstrates the Chilkat Mime.ContainsSignedParts method, which returns whether the currently visible MIME tree contains a complete detached or opaque CMS/PKCS #7 signed entity. It takes no arguments.

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

Background: Where IsSigned asks whether the top entity is a signature wrapper, this scans the whole tree for a signed part nested anywhere inside — useful when signing is applied to a sub-part rather than the outermost entity. It is the discovery step before deciding whether verification is needed.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Mime.ContainsSignedParts method, which returns whether the MIME tree contains a complete CMS/PKCS #7 signed entity.  It takes no arguments.

local mime = chilkat.Mime.new()
local success = mime:load_mime_file("qa_data/message.eml")
if not success then
    print(mime.last_error_text)
    return
end

if mime:contains_signed_parts() then
    print("The message tree contains a signed part.")
else
    print("The message tree contains no signed part.")
end