(Node.js) Combine Timestamp Reply and Content File into a TimeStampData

Demonstrates how to combine a timestamp reply (RFC 3161) with a data file (any type of file) to create a TimeStampData structure (RFC 5544).

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    // Also see this example:
    // Send a TimeStamp Request to a TimeStamp Authority and get the Response

    // Load a timestamp reply file
    var bdTsr = new chilkat.BinData();
    var success = bdTsr.LoadFile("qa_data/tsd/sample.tsr");
    if (success !== true) {
        console.log("Failed to load timestamp reply file.");
        return;
    }

    // Load the tsr into an ASN.1 object.
    var asnTsr = new chilkat.Asn();
    success = asnTsr.LoadEncoded(bdTsr.GetEncoded("base64"),"base64");
    if (success !== true) {
        console.log(asnTsr.LastErrorText);
        return;
    }

    // Get the timestamp reply as XML.
    var xmlTsr = new chilkat.Xml();
    xmlTsr.LoadXml(asnTsr.AsnToXml());

    // The timestamp reply XML begins like this:
    // We'll want to remove the 1st "sequence" subtree.

    //     <?xml version="1.0" encoding="utf-8"?>
    //     <sequence>
    //         <sequence>       <---- Remove this sub-tree.
    //             <int>00</int>
    //             <sequence>
    //                 <utf8>Operation Okay</utf8>
    //             </sequence>
    //         </sequence>
    //         <sequence>   
    //             <oid>1.2.840.113549.1.7.2</oid>
    //             <contextSpecific tag="0" constructed="1">
    //             ...

    // Remove the 1st sub-tree..
    xmlTsr.RemoveChildByIndex(0);

    // In this example, the data file we're combining with the timestamp into a timestampData is a .p7m.
    // However, it can be any type of file (text or binary), it doesn't matter..
    var bdContent = new chilkat.BinData();
    success = bdContent.LoadFile("qa_data/tsd/sample.p7m");
    if (success !== true) {
        console.log("Failed to load content file.");
        return;
    }

    // Begin building the TimeStampData.  
    // We'll build as XML and then convert to ASN.1
    var xml = new chilkat.Xml();
    xml.Tag = "sequence";
    xml.UpdateChildContent("oid","1.2.840.113549.1.9.16.1.31");
    xml.UpdateAttrAt("contextSpecific",true,"tag","0");
    xml.UpdateAttrAt("contextSpecific",true,"constructed","1");
    xml.UpdateChildContent("contextSpecific|sequence|int","01");
    xml.UpdateChildContent("contextSpecific|sequence|octets",bdContent.GetEncoded("base64"));
    xml.UpdateAttrAt("contextSpecific|sequence|contextSpecific",true,"tag","0");
    xml.UpdateAttrAt("contextSpecific|sequence|contextSpecific",true,"constructed","1");

    // xContext: Xml
    var xContext = xml.GetChildWithTag("contextSpecific|sequence|contextSpecific");
    xContext.AddChildTree(xmlTsr);

    // Convert the XML to ASN.1
    var tsd = new chilkat.Asn();
    tsd.LoadAsnXml(xml.GetXml());

    // Write the timestamped data to a file.
    success = tsd.WriteBinaryDer("qa_output/sample.tsd");

    // Alternatively, get the tsd ASN.1 as base64..
    var tsdBase64 = tsd.GetEncodedDer("base64_mime");
    console.log(tsdBase64);

}

chilkatExample();