(Lianja) Load .crl, Convert to XML, Get Revoked Serial Numbers and Dates

Load a binary .crl file (Certificate Revocation List), converts to XML, and then gets the revoked certificate serial numbers and revocation dates.

Note: This example requires Chilkat v9.5.0.77 or greater.

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

// Load a binary .crl file.
loBdCrl = createobject("CkBinData")
llSuccess = loBdCrl.LoadFile("qa_data/crl/ca1.crl")
if (llSuccess <> .T.) then
    ? "Failed to load CRL file."
    release loBdCrl
    return
endif

loAsn = createobject("CkAsn")
llSuccess = loAsn.LoadBd(loBdCrl)
if (llSuccess <> .T.) then
    ? loAsn.LastErrorText
    release loBdCrl
    release loAsn
    return
endif

// Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
loXml = createobject("CkXml")
loXml.LoadXml(loAsn.AsnToXml())
llSuccess = loXml.SaveXml("qa_output/crl.xml")

// Use this online tool to generate parsing code from CRL XML: 
// Generate Parsing Code from XML

// Here's code to parse the XML.  This code was generated by the above tool,
// and then we modified it by removing unneeded code and changing some names

loDt = createobject("CkDateTime")

i = 0
lnCount_i = loXml.NumChildrenHavingTag("sequence")
do while i < lnCount_i
    loXml.I = i

    j = 0
    lnCount_j = loXml.NumChildrenHavingTag("sequence[i]|sequence")
    do while j < lnCount_j
        loXml.J = j

        k = 0
        lnCount_k = loXml.NumChildrenHavingTag("sequence[i]|sequence[j]|sequence")
        do while k < lnCount_k
            loXml.K = k

            // Get the revoked certificate's serial number in uppercase hex.
            lcRevokedCertSerialHex = loXml.GetChildContent("sequence[i]|sequence[j]|sequence[k]|int")
            ? "serial number: " + lcRevokedCertSerialHex

            // Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
            lcDateRevoked = loXml.GetChildContent("sequence[i]|sequence[j]|sequence[k]|utctime")

            // Starting in Chilkat v9.5.0.77, date/time strings formatted as YYMMDDhhmmssZ can be parsed as follows:
            loDt.SetFromTimestamp(lcDateRevoked)
            ? "date revoked: " + loDt.GetAsRfc822(.F.)

            k = k + 1
        enddo
        j = j + 1
    enddo
    i = i + 1
enddo


release loBdCrl
release loAsn
release loXml
release loDt