JavaScript

Load and Validate a JWS from a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJwsSb, which loads a JWS from a StringBuilder (here read from a file). The example then supplies the MAC key and validates the signature.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Background. Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a negative value on error.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var jws = new CkJws();

//  The file path is relative to the application's current working directory.  An absolute path may
//  also be used.  Supply the path appropriate to your own environment.

//  Load the JWS text from a file into a StringBuilder.
var sbJws = new CkStringBuilder();
var bLoaded = sbJws.LoadFile("qa_data/message.jws","utf-8");
if (bLoaded !== true) {
    console.log("Failed to load the JWS file.");
    return;
}

//  Load the JWS from the StringBuilder.
success = jws.LoadJwsSb(sbJws);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

var base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
success = jws.SetMacKey(0,base64Key,"base64");
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

var v = jws.Validate(0);
if (v < 0) {
    console.log(jws.LastErrorText);
    return;
}

if (v !== 1) {
    console.log("The signature is not valid.");
    return;
}

console.log("The signature is valid.");