JavaScript

Sign a JWS with a Private Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPrivateKey, which sets the private key used to create a signature. The example uses RS256 (RSASSA-PKCS1-v1_5 with SHA-256).

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. Public-key JWS signs with a private key so that anyone holding the corresponding public key can verify the signature.

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();

//  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
var header = new CkJsonObject();
header.UpdateString("alg","RS256");
success = jws.SetProtectedHeader(0,header);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

var bIncludeBom = false;
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

//  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 signer's private key and set it for signature 0.
var privKey = new CkPrivateKey();
success = privKey.LoadPemFile("qa_data/signer_privkey.pem");
if (success == false) {
    console.log(privKey.LastErrorText);
    return;
}

success = jws.SetPrivateKey(0,privKey);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

var jwsCompact = jws.CreateJws();
if (jws.LastMethodSuccess == false) {
    console.log(jws.LastErrorText);
    return;
}

console.log(jwsCompact);