(Node.js) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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();

    // Load the PEM containing cert + private key.
    var pem = new chilkat.Pem();
    var success = pem.LoadPemFile("qa_data/pem/myPem.pem","password");
    if (success !== true) {
        console.log(pem.LastErrorText);
        return;
    }

    // privkey: PrivateKey
    var privkey = pem.GetPrivateKey(0);
    if (pem.LastMethodSuccess !== true) {
        console.log(pem.LastErrorText);
        return;
    }

    // cert: Cert
    var cert = pem.GetCert(0);
    if (pem.LastMethodSuccess !== true) {

        console.log(pem.LastErrorText);
        return;
    }

    success = crypt.SetSigningCert2(cert,privkey);
    if (success !== true) {

        console.log(crypt.LastErrorText);
        return;
    }

    // Alternatively, we could use a .pfx/.p12 file.
    // (Chilkat also supports other formats/sources for cert/private keys...)
    var certFromP12 = new chilkat.Cert();
    success = certFromP12.LoadPfxFile("qa_data/p12/myP12.p12","password");
    if (success !== true) {
        console.log(certFromP12.LastErrorText);
        return;
    }

    // The certificate, when loaded from a .pfx/.p12, will automatically 
    // include the associated private key, assuming it's present in the .p12.
    // We don't have to explicitly provide the private key as in the
    // lines of code above that use the PEM file.
    success = crypt.SetSigningCert(certFromP12);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.p7m");
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();