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Tcl Examples

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(Tcl) 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 Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set cert [new_CkCert]

set success [CkCert_LoadFromFile $cert "qa_data/certs/test_haswdt.cer"]
if {[expr $success != 1]} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCert $cert
    exit
}

#  Get the CRL Distribution Points extension, which is at OID 2.5.29.31
set extensionXmlStr [CkCert_getExtensionAsXml $cert "2.5.29.31"]
if {[expr [CkCert_get_LastMethodSuccess $cert] == 0]} then {
    puts "Certificate does not have the CDP extension."
    delete_CkCert $cert
    exit
}

set xml [new_CkXml]

CkXml_LoadXml $xml $extensionXmlStr

#  See what we have..
puts [CkXml_getXml $xml]

#  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...
set sbDistPoint [new_CkStringBuilder]

set success [CkXml_GetChildContentSb $xml "sequence|contextSpecific|contextSpecific|contextSpecific" $sbDistPoint]
if {[expr $success == 1]} then {
    [CkStringBuilder_Decode $sbDistPoint "base64" "utf-8"]
    puts "CRL Distribution Point:  [CkStringBuilder_getAsString $sbDistPoint]"
}

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

delete_CkCert $cert
delete_CkXml $xml
delete_CkStringBuilder $sbDistPoint

 

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