(Ruby) 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.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

# Load a binary .crl file.
bdCrl = Chilkat::CkBinData.new()
success = bdCrl.LoadFile("qa_data/crl/ca1.crl")
if (success != true)
    print "Failed to load CRL file." + "\n";
    exit
end

asn = Chilkat::CkAsn.new()
success = asn.LoadBd(bdCrl)
if (success != true)
    print asn.lastErrorText() + "\n";
    exit
end

# Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
xml = Chilkat::CkXml.new()
xml.LoadXml(asn.asnToXml())
success = xml.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

dt = Chilkat::CkDateTime.new()

i = 0
count_i = xml.NumChildrenHavingTag("sequence")
while i < count_i
    xml.put_I(i)

    j = 0
    count_j = xml.NumChildrenHavingTag("sequence[i]|sequence")
    while j < count_j
        xml.put_J(j)

        k = 0
        count_k = xml.NumChildrenHavingTag("sequence[i]|sequence[j]|sequence")
        while k < count_k
            xml.put_K(k)

            # Get the revoked certificate's serial number in uppercase hex.
            revokedCertSerialHex = xml.getChildContent("sequence[i]|sequence[j]|sequence[k]|int")
            print "serial number: " + revokedCertSerialHex + "\n";

            # Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
            dateRevoked = xml.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:
            dt.SetFromTimestamp(dateRevoked)
            print "date revoked: " + dt.getAsRfc822(false) + "\n";

            k = k + 1
        end
        j = j + 1
    end
    i = i + 1
end