C#

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.

C#

bool 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.
Chilkat.BinData bdCrl = new Chilkat.BinData();
success = bdCrl.LoadFile("qa_data/crl/ca1.crl");
if (success != true) {
    Debug.WriteLine("Failed to load CRL file.");
    return;
}

Chilkat.Asn asn = new Chilkat.Asn();
success = asn.LoadBd(bdCrl);
if (success != true) {
    Debug.WriteLine(asn.LastErrorText);
    return;
}

// Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
Chilkat.Xml xml = new Chilkat.Xml();
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
int i;
int count_i;
string tagPath;
int j;
int count_j;
int k;
int count_k;

string revokedCertSerialHex;
string dateRevoked;

Chilkat.CkDateTime dt = 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");
            Debug.WriteLine("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:
            dt.SetFromTimestamp(dateRevoked);
            Debug.WriteLine("date revoked: " + dt.GetAsRfc822(false));

            k = k + 1;
        }

        j = j + 1;
    }

    i = i + 1;
}