Lua Requires Chilkat v9.5.0.89+

CoSign PKCS7/CMS Signed Data

See more Digital Signatures Examples

Demonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data.

In this example, we cosign an existing pdf.p7s

Lua

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()
local cert = chilkat.Cert.new()

-- If loading from a smart card, set the smartcard PIN.
cert.smart_card_pin = "0000"

-- Load a certificate in some way, such as from a smart card.
-- Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores..
local success = cert:load_from_smartcard("")
if not success then
    print(cert.last_error_text)
    return
end

success = crypt:set_signing_cert(cert)
if not success then
    print(crypt.last_error_text)
    return
end

-- Load the file to be co-signed.
-- NOTE:  This is to cosign a PDF file contained within a CMS (PKCS7) message.
-- (In other words, the PDF is contained within the CMS SignedData, rather than the other way around
-- where a CMS signature is contained within a PDF.  Use Chilkat's PDF class to sign a PDF, which is
-- to embed a CMS signature within the PDF.)
local bd = chilkat.BinData.new()
success = bd:load_file("qa_data/p7s/cosign/sample.pdf.p7s")
if not success then
    print("Failed to load pdf.p7s input file.")
    return
end

-- bd2 will contain the co-signed result.
local bd2 = chilkat.BinData.new()
success = crypt:co_sign(bd, cert, bd2)
if not success then
    print(crypt.last_error_text)
    return
end

success = bd:write_file("qa_output/cosigned.pdf.p7s")
if not success then
    print("Failed to save pdf.p7s output file.")
    return
end

print("Success!")