Lua

Create CMS (PKCS7) Detached MIME Signature

Demonstrates how to add a CMS detached signature to MIME. Lua

local chilkat = require("chilkat")

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

local mime = chilkat.Mime.new()

-- Load a certificate w/ private key for signing.
local cert = chilkat.Cert.new()
local success = cert:load_pfx_file("qa_data/pfx/ecc256_12345.p12", "12345")
if not success then
    print(cert.last_error_text)
    return
end

print("Cert: " .. cert.subject_dn)

-- Create a simple MIME message to be signed:
mime:add_header_field("Subject", "This is a test")
mime:add_header_field("MyCustomHeader", "abc123")
mime.content_type = "text/plain"
mime:set_body("This is a plain-text body.")

-- Examine the MIME prior to signing:
print("--- MIME prior to signing ---")
print(mime:get_mime())

-- The MIME prior to signing looks like this:

-- Subject: This is a test
-- MyCustomHeader: abc123
-- Content-Type: text/plain; format=flowed
--
-- This is a plain-text body.

-- Use SHA256 as the hash algorithm in the CMS signature.
mime.signing_hash_alg = "SHA256"

-- Add a detached signature:
success = mime:add_detached_signature(cert)
if not success then
    print(mime.last_error_text)
    return
end

-- Examine the MIME with detached signature:
print("--- MIME with detached signature ---")
print(mime:get_mime())

-- Content-Type: multipart/signed; boundary="----=_NextPart_6e3_c655_9641494d.b4f00501";
--  protocol="application/x-pkcs7-signature";
--  micalg=sha256
--
-- ------=_NextPart_6e3_c655_9641494d.b4f00501
-- Subject: This is a test
-- MyCustomHeader: abc123
-- Content-Type: text/plain; format=flowed
--
-- This is a plain-text body.
-- ------=_NextPart_6e3_c655_9641494d.b4f00501
-- Content-Transfer-Encoding: base64
-- Content-Type: application/x-pkcs7-signature; name="smime.p7s"
-- Content-Disposition: attachment; filename="smime.p7s"
--
-- MIID7AYJKoZIhvcNAQcCoIID3TCCA9kCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
-- ggJxMIICbTCCAhOgAwIBAgIJAJuS2kgOoyr+MAkGByqGSM49BAEwWzELMAkGA1UEBhMCQVUxEzAR
-- BgNVBAgTClNvbWUtU3RhdGUxITAfBgNVBAoTGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEUMBIG
-- A1UEAxMLZWNjMjU2LXRlc3QwHhcNMTYwODIzMTU0OTM5WhcNNDQwMTA4MTU0OTM5WjBbMQswCQYD
-- VQQGEwJBVTETMBEGA1UECBMKU29tZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQ
-- dHkgTHRkMRQwEgYDVQQDEwtlY2MyNTYtdGVzdDBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABARy
-- Hd86A7+qQ4DlIfKynZaFGdGLpkU3GlQwqaVD6GIJg3QIDhaWEksYtZ9OWjNHn9a6+i/P9o5/NrdI
-- SP0VWDWjgcAwgb0wHQYDVR0OBBYEFGmd2DfK4c3VBTVn8ebKH2BTmRicMIGNBgNVHSMEgYUwgYKA
-- FGmd2DfK4c3VBTVn8ebKH2BTmRicoV+kXTBbMQswCQYDVQQGEwJBVTETMBEGA1UECBMKU29tZS1T
-- dGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMRQwEgYDVQQDEwtlY2MyNTYt
-- dGVzdIIJAJuS2kgOoyr+MAwGA1UdEwQFMAMBAf8wCQYHKoZIzj0EAQNJADBGAiEAhuiwGy0lZKtK
-- LA13Ffc8AMTK7NsePPSfs0clXlZUR78CIQDXsJXpYsJ7tlTeockrK+6099sG/gGFTRPiQYU8juyf
-- LzGCAT8wggE7AgEBMGgwWzELMAkGA1UEBhMCQVUxEzARBgNVBAgTClNvbWUtU3RhdGUxITAfBgNV
-- BAoTGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEUMBIGA1UEAxMLZWNjMjU2LXRlc3QCCQCbktpI
-- DqMq/jANBglghkgBZQMEAgEFAKBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcN
-- AQkFMQ8XDTIyMDUwODE0MzM1NFowLwYJKoZIhvcNAQkEMSIEIMvNpYuymLvF68aFFe+l3NEQTdkB
-- 7T8U6/j+Y5FgDlIUMAoGCCqGSM49BAMCBEYwRAIgQ6migEn3Le9ciIVUP/qc2JZAJZWjpulJXY9Q
-- IZJ3XK0CIGZwpLOgiv7ES8958hqT9a/q7aPc1xmkaZHtsat/k+Ki
--
-- ------=_NextPart_6e3_c655_9641494d.b4f00501--