(Ruby) Get Certificate CRL Distribution Points

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.

Note: This example requires Chilkat v9.5.0.76 or greater.

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

require 'chilkat'

cert = Chilkat::CkCert.new()

success = cert.LoadFromFile("qa_data/certs/test_haswdt.cer")
if (success != true)
    print cert.lastErrorText() + "\n";
    exit
end

#  Get the CRL Distribution Points extension, which is at OID 2.5.29.31
extensionXmlStr = cert.getExtensionAsXml("2.5.29.31")
if (cert.get_LastMethodSuccess() == false)
    print "Certificate does not have the CDP extension." + "\n";
    exit
end

xml = Chilkat::CkXml.new()
xml.LoadXml(extensionXmlStr)

#  See what we have..
print xml.getXml() + "\n";

#  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...
sbDistPoint = Chilkat::CkStringBuilder.new()
success = xml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint)
if (success == true)
    sbDistPoint.Decode("base64","utf-8")
    print "CRL Distribution Point:  " + sbDistPoint.getAsString() + "\n";
end

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