Xojo Plugin

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

See more Certificates Examples

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.

Xojo Plugin

Dim success As Boolean
success = False

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

// Load a binary .crl file.
Dim bdCrl As New Chilkat.BinData
success = bdCrl.LoadFile("qa_data/crl/ca1.crl")
If (success <> True) Then
    System.DebugLog("Failed to load CRL file.")
    Return
End If

Dim asn As New Chilkat.Asn
success = asn.LoadBd(bdCrl)
If (success <> True) Then
    System.DebugLog(asn.LastErrorText)
    Return
End If

// Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
Dim xml As New Chilkat.Xml
success = 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
Dim i As Int32
Dim count_i As Int32
Dim tagPath As String
Dim j As Int32
Dim count_j As Int32
Dim k As Int32
Dim count_k As Int32

Dim revokedCertSerialHex As String
Dim dateRevoked As String

Dim dt As New Chilkat.CkDateTime

i = 0
count_i = xml.NumChildrenHavingTag("sequence")
While i < count_i
    xml.I = i

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

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

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

            // 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:
            success = dt.SetFromTimestamp(dateRevoked)
            System.DebugLog("date revoked: " + dt.GetAsRfc822(False))

            k = k + 1
        Wend
        j = j + 1
    Wend
    i = i + 1
Wend