Lua Requires Chilkat v9.5.0.76+

Get Certificate Authority Information Access

See more Certificates Examples

Demonstrates how to get a certificate's Authority Information Access extension data (if it exists). 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 Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
local extensionXmlStr = cert:get_extension_as_xml("1.3.6.1.5.5.7.1.1")
if not cert.last_method_success then
    print("Certificate does not have the AuthInfoAccess 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>
--         <oid>1.3.6.1.5.5.7.48.2</oid>
--         <contextSpecific tag="6" constructed="0">aHR0cDovL2NydC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
-- cmVFbWFpbENBLmNydA==</contextSpecific>
--     </sequence>
--     <sequence>
--         <oid>1.3.6.1.5.5.7.48.1</oid>
--         <contextSpecific tag="6" constructed="0">aHR0cDovL29jc3AuY29tb2RvY2EuY29t</contextSpecific>
--     </sequence>
-- </sequence>

-- Typically, a certificate AIA(Authority Information access) contains 2 parts:
--
--     On-line Certificate Status Protocol (1.3.6.1.5.5.7.48.1)
--     Certification Authority Issuer (1.3.6.1.5.5.7.48.2)
--
-- The base64 content for each OID (in this case) is just a string.
-- The data can be accessed and decoded like this:

local sbOcsp = chilkat.StringBuilder.new()
success = xml:get_child_content_sb("/C/oid,1.3.6.1.5.5.7.48.1|++", sbOcsp)
if success then
    sbOcsp:decode("base64", "utf-8")
    print("1.3.6.1.5.5.7.48.1:  " .. sbOcsp:get_as_string())
end

local sbIssuer = chilkat.StringBuilder.new()
success = xml:get_child_content_sb("/C/oid,1.3.6.1.5.5.7.48.2|++", sbIssuer)
if success then
    sbIssuer:decode("base64", "utf-8")
    print("1.3.6.1.5.5.7.48.2:  " .. sbIssuer:get_as_string())
end

-- The output looks like this:

-- 1.3.6.1.5.5.7.48.1:  http://ocsp.comodoca.com
-- 1.3.6.1.5.5.7.48.2:  http://crt.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crt

-- -------------------------------------------------------------------------------
-- Note: The Chilkat path passed to GetChildContentSb is composed of two commands:
-- The first command is "/C/oid,1.3.6.1.5.5.7.48.1".   It says "traverse the XML tree from the caller
-- node and stop at the 1st node having tag = "oid" and content = "1.3.6.1.5.5.7.48.1".
-- The "|" char separates the 1st command from the 2nd.
-- The 2nd command is "++" and says "move to the next sibling".