Lua

PKCS7 Encrypt using Multiple Certificates

See more MIME Examples

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key. Lua

local chilkat = require("chilkat")

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

local mime = chilkat.Mime.new()

-- Build a simple MIME message to be encrypted:
local success = mime:add_header_field("Content-Type", "text/plain")
success = mime:add_header_field("abc", "123")
mime:set_body("This is a test")

-- A digital certificate is required to create PKCS7 encrypted MIME.
-- It can come from a variety of sources: .cer file, .pfx file, PEM files,
-- an in-memory representation, or directly from a Windows
-- registry-based certificate store.

-- Load one cert from a .cer file:
local cert1 = chilkat.Cert.new()
success = cert1:load_from_file("myCert.cer")
if not success then
    print(cert1.last_error_text)
    return
end

-- Load another cert ...
local cert2 = chilkat.Cert.new()
success = cert2:load_from_file("anotherCert.cer")
if not success then
    print(cert2.last_error_text)
    return
end

-- Tell the MIME object to use these certs for encrypting:
-- (AddEncryptCert shouldn't fail if we already know it contains
-- a valid certificate..)
success = mime:add_encrypt_cert(cert1)
success = mime:add_encrypt_cert(cert2)

-- Encrypt the MIME:
success = mime:encrypt_n()
if not success then
    print(mime.last_error_text)
    return
end

-- Display the MIME:
print(mime:get_mime())

-- The resulting S/MIME looks something like this:

-- abc: 123
-- Content-Disposition: attachment; filename="smime.p7m";
-- Content-Transfer-Encoding: base64
-- Content-Type: application/x-pkcs7-mime;
--  name="smime.p7m";
--
-- MIID4QYJKoZIhvcNAQcDoIID0jCCA84CAQAxggNlMIIBgQIBADBpMFUxCzAJBgNVBAYTAlpBMSUw
-- IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMR8wHQYDVQQDExZUaGF3dGUgQ29k
-- ZSBTaWduaW5nIENBAhB4ouTcAmLszrGi170k1deSMA0GCSqGSIb3DQEBAQUABIIBAKnOPgmISrNH
-- Hd+zESvH5dl5TvBLCxLuIuH6cuZdowHzCqAUzaYFdn1rp88Vvu2x3s6WOvzje/+dE1x0YjEpeqxd
-- ufehlb6Jl9ucxSMWARWMxWGxu0eZGJVt+SBBrVddqdtrIU9lVt5rBxkU67P8PxgbwdNCX3qJENRO
-- P/rvp5ngoCkpIxeGqSkPvWv+CA3IXS8FPs8Sl4HNPiAj3e9RBm2MxI1u4cn1HvgGg8yHgHLMG5JF
-- LzGsmotSQaqEwq2JtOlkjfOwEI+ZhbWQupj6gen2aGc5sW3J26H1usxtV2TQ7WRRxqnZGmlh20dW
-- 4lo3kITYI+iapGlJXmrlDYh2CjkwggHcAgEAMIHDMIGuMQswCQYDVQQGEwJVUzELMAkGA1UECBMC
-- VVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdv
-- cmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTE2MDQGA1UEAxMtVVROLVVTRVJG
-- aXJzdC1DbGllbnQgQXV0aGVudGljYXRpb24gYW5kIEVtYWlsAhAj50QEWUPwA+jXOiL8sMwXMA0G
-- CSqGSIb3DQEBAQUABIIBAFQ1cydWC4M9tdgAlCN03kP8eyuXajwT+5ByhOcJhjuCABg7U8w4Rx28
-- braGqV+TCBxjyMsqD0KcW49VT6ZHMpQ1yN8R72qDsidmfm9w3u0jVgsaaBkTJXMy4COY/3cZWmYG
-- dL3Qty8uFeQYddytt6UPJpGJZYsrdFG2doe6qHiRtAxxPrd0GmQRcGvxyDdsojkoBlTMbfwaXOI3
-- xepR/oh60x/3npUCsl2VpNPfo6oZoej6YZGEuz2MvuWvXVhvuqoTqXGwGDgYMxwTbPwklqZiJtsK
-- r5Ep3NlWAQX8MGWL0H+NC22cqJuqUCL05yqyAv+JMCpZGAwOVb/wiVNjpAIwYAYJKoZIhvcNAQcB
-- MBkGCCqGSIb3DQMCMA0CAToECA5NAJY12cU+gDgZFUc+nsQUUbiR1GH8iBVLI+XWlja9TXEe1Hzt
-- NlsOylRVBDzjNxUtX/zC0YR7bs+2Cf4JbyuMOA==