Zig

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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    // Load a binary .crl file.
    const bd_crl = try chilkat.BinData.init();
    defer bd_crl.deinit();
    bd_crl.loadFile("qa_data/crl/ca1.crl") catch {
        std.debug.print("Failed to load CRL file.\n", .{});
        return;
    };

    const asn = try chilkat.Asn.init();
    defer asn.deinit();
    asn.loadBd(bd_crl) catch {
        std.debug.print("{s}\n", .{try asn.getLastErrorText(alloc)});
        return;
    };

    // Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
    const xml = try chilkat.Xml.init();
    defer xml.deinit();
    xml.loadXml(try asn.asnToXml(alloc)) catch {};
    try 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
    var i: i32 = 0;
    var j: i32 = 0;
    var count_j: i32 = 0;
    var k: i32 = 0;
    var count_k: i32 = 0;

    var revoked_cert_serial_hex: [:0]const u8 = "";
    var date_revoked: [:0]const u8 = "";

    const dt = try chilkat.DateTime.init();
    defer dt.deinit();

    i = 0;
    const count_i = xml.numChildrenHavingTag("sequence");
    while (i < count_i) {
        xml.setI(i);

        j = 0;
        count_j = xml.numChildrenHavingTag("sequence[i]|sequence");
        while (j < count_j) {
            xml.setJ(j);

            k = 0;
            count_k = xml.numChildrenHavingTag("sequence[i]|sequence[j]|sequence");
            while (k < count_k) {
                xml.setK(k);

                // Get the revoked certificate's serial number in uppercase hex.
                revoked_cert_serial_hex = try xml.getChildContent(alloc, "sequence[i]|sequence[j]|sequence[k]|int");
                std.debug.print("serial number: {s}\n", .{revoked_cert_serial_hex});

                // Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
                date_revoked = try xml.getChildContent(alloc, "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(date_revoked) catch {};
                std.debug.print("date revoked: {s}\n", .{try dt.getAsRfc822(alloc, false)});

                k = k + 1;
            }

            j = j + 1;
        }

        i = i + 1;
    }
}