(Node.js) Sign a File to Create a .p7s (Detached Signature)

Node.js example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

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

    var crypt = new chilkat.Crypt2();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    var signingCertSubject = "Acme Inc";
    var pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx";
    var pfxPassword = "test123";

    var certStore = new chilkat.CertStore();
    var success = certStore.LoadPfxFile(pfxFilename,pfxPassword);
    if (success !== true) {
        console.log(certStore.LastErrorText);
        return;
    }

    // cert: Cert
    var cert = certStore.FindCertBySubjectCN(signingCertSubject);
    if (certStore.LastMethodSuccess == false) {
        console.log("Failed to find certificate by subject common name.");
        return;
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert);

    // We can sign any type of file, creating a .p7s as output:
    var inFile = "/Users/chilkat/testData/pdf/sample.pdf";
    var sigFile = "/Users/chilkat/testData/p7s/sample.p7s";

    success = crypt.CreateP7S(inFile,sigFile);
    if (success == false) {
        console.log(crypt.LastErrorText);

        return;
    }

    success = crypt.VerifyP7S(inFile,sigFile);
    if (success == false) {
        console.log(crypt.LastErrorText);

        return;
    }

    console.log("Success!");

}

chilkatExample();