(Node.js) Sign a File to Create a .p7m File (using a PFX)

Node.js example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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.

    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;
    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 .p7m as output:
    var inFile = "/Users/chilkat/testData/pdf/sample.pdf";
    var outputFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m";
    success = crypt.CreateP7M(inFile,outputFile);
    if (success == false) {
        console.log(crypt.LastErrorText);

        return;
    }

    // Verify and restore the original file:
    success = crypt.SetVerifyCert(cert);

    inFile = outputFile;
    outputFile = "/Users/chilkat/testData/pdf/restored.pdf";

    success = crypt.VerifyP7M(inFile,outputFile);
    if (success == false) {
        console.log(crypt.LastErrorText);

        return;
    }

    console.log("Success!");

}

chilkatExample();