Lua

Convert PDF to pdf.p7s (Digitally Signed)

See more CAdES Examples

Demonstrates how to convert a PDF into a .p7s file that contains the PDF within a PKCS7 signature (the .p7s format). Lua

local chilkat = require("chilkat")

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

-- -----------------------------------------------------------------
-- Note: This is case where the .p7s extension is used where the .p7m extension
-- is technically more appropriate.
-- See .p7s vs .p7m file extension
-- -----------------------------------------------------------------

local crypt = chilkat.Crypt2.new()

local cert = chilkat.Cert.new()
local success = cert:load_pfx_file("qa_data/pfx/cert_test123.pfx", "test123")
if not success then
    print(cert.last_error_text)
    return
end

-- Tell the crypt component to use this cert.
success = crypt:set_signing_cert(cert)
if not success then
    print(crypt.last_error_text)
    return
end

-- The CadesEnabled property applies to all methods that create PKCS7 signatures.
-- To create a CAdES-BES signature, set this property equal to true.
crypt.cades_enabled = true

crypt.hash_algorithm = "sha256"

-- We can sign any type of file, creating a .p7s as output.
-- The .p7s contains the signature and also embeds the data of the file that is signed.
local inFile = "qa_data/pdf/sample.pdf"
local p7sFile = "qa_output/sample.pdf.p7s"

-- -----------------------------------------------------------------------------------------
-- Also see Chilkat's online tool to examine a .p7m and generate code to duplicate the .p7m
-- -----------------------------------------------------------------------------------------

-- Create the CAdES-BES attached signature, which contains the original data.
-- Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
-- is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
-- is NOT contained within the signature.  We want the data to be contained in the signature, therefore
-- we call CreateP7M even though we are naming our output file .p7s.
success = crypt:create_p7_m(inFile, p7sFile)
if not success then
    print(crypt.last_error_text)
    return
end

-- Verify the .p7s file and extract the original file from the .p7s.
local extractedToFilePath = "qa_output/sample.pdf"
success = crypt:verify_p7_m(p7sFile, extractedToFilePath)
if not success then
    print(crypt.last_error_text)
    return
end

print("Success!")