(Node.js) Sign JSON to Create CAdES P7S Bytes

Demonstrates how to sign JSON using a certificate + private key from a .p12/.pfx to create a CAdES P7S byte array.

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

    var crypt = new chilkat.Crypt2();

    var cert = new chilkat.Cert();
    var success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true. 
    crypt.CadesEnabled = true;

    crypt.HashAlgorithm = "sha256";

    var jsonSigningAttrs = new chilkat.JsonObject();
    jsonSigningAttrs.UpdateInt("contentType",1);
    jsonSigningAttrs.UpdateInt("signingTime",1);
    jsonSigningAttrs.UpdateInt("messageDigest",1);
    jsonSigningAttrs.UpdateInt("signingCertificateV2",1);
    crypt.SigningAttributes = jsonSigningAttrs.Emit();

    // By default, all the certs in the chain of authentication are included in the signature.
    // If desired, we can choose to only include the signing certificate:
    crypt.IncludeCertChain = false;

    // Create the CAdES-BES attached signature, which contains the original data.
    crypt.Charset = "utf-8";

    cadesP7s = crypt.OpaqueSignString("{ \"abc\": 123}");
    if (crypt.LastMethodSuccess == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Verify the signature and extract the original JSON:
    var originalJson = crypt.OpaqueVerifyString(cadesP7s);
    if (crypt.LastMethodSuccess == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log("Original JSON: " + originalJson);

    console.log("Success!");

}

chilkatExample();