(Ruby) Get Certificate Authority Information Access

Demonstrates how to get a certificate's Authority Information Access extension data (if it exists).

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 Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
extensionXmlStr = cert.getExtensionAsXml("1.3.6.1.5.5.7.1.1")
if (cert.get_LastMethodSuccess() == false)
    print "Certificate does not have the AuthInfoAccess 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>
#          <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:

sbOcsp = Chilkat::CkStringBuilder.new()
success = xml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.1|++",sbOcsp)
if (success == true)
    sbOcsp.Decode("base64","utf-8")
    print "1.3.6.1.5.5.7.48.1:  " + sbOcsp.getAsString() + "\n";
end

sbIssuer = Chilkat::CkStringBuilder.new()
success = xml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.2|++",sbIssuer)
if (success == true)
    sbIssuer.Decode("base64","utf-8")
    print "1.3.6.1.5.5.7.48.2:  " + sbIssuer.getAsString() + "\n";
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".