Lua Requires Chilkat v9.5.0.76+

Get Certificate CRL Distribution Points

See more Certificates Examples

Demonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point. Lua

local chilkat = require("chilkat")

local cert = chilkat.Cert.new()

local success = cert:load_from_file("qa_data/certs/test_haswdt.cer")
if not success then
    print(cert.last_error_text)
    return
end

-- Get the CRL Distribution Points extension, which is at OID 2.5.29.31
local extensionXmlStr = cert:get_extension_as_xml("2.5.29.31")
if not cert.last_method_success then
    print("Certificate does not have the CDP extension.")
    return
end

local xml = chilkat.Xml.new()
xml:load_xml(extensionXmlStr)

-- See what we have..
print(xml:get_xml())

-- We should get XML like this:

-- <?xml version="1.0" encoding="utf-8" ?>
-- <sequence>
--     <sequence>
--         <contextSpecific tag="0" constructed="1">
--             <contextSpecific tag="0" constructed="1">
--                 <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
-- cmVFbWFpbENBLmNybA==</contextSpecific>
--             </contextSpecific>
--         </contextSpecific>
--     </sequence>
-- </sequence>
--

-- Assuming there is one CRL Distribution Point...
local sbDistPoint = chilkat.StringBuilder.new()
success = xml:get_child_content_sb("sequence|contextSpecific|contextSpecific|contextSpecific", sbDistPoint)
if success then
    sbDistPoint:decode("base64", "utf-8")
    print("CRL Distribution Point:  " .. sbDistPoint:get_as_string())
end

-- Sample output:
-- CRL Distribution Point:  http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl