(Node.js) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

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 rsa = new chilkat.Rsa();

    // Generate a 2048-bit key.  Chilkat RSA supports
    var success = rsa.GenerateKey(2048);
    if (success !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Get the public part of the key.
    // pubKey: PublicKey
    var pubKey = rsa.ExportPublicKeyObj();

    // There are two possible formats for representing the RSA public key 
    // in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
    // We can get either by setting bChoosePkcs1 to true or false.
    var bChoosePkcs1 = true;
    var pubKeyBase64Der = pubKey.GetEncoded(bChoosePkcs1,"base64");
    console.log("Public Key Base64 DER:");
    console.log(pubKeyBase64Der);

    // Now get the private key as Base64 DER:
    // Get the private part of the key.
    // (Note: A public key is actually just a subset of the private key.  
    //  If you have the private key, you also have the public key.
    //  Thus Chilkat provides a method to get the public key from the private key.)
    // privKey: PrivateKey
    var privKey = rsa.ExportPrivateKeyObj();

    // Again, we can get PKCS1 or PKCS8, but with different methods:
    var privKeyPkcs1 = privKey.GetPkcs1ENC("base64");
    console.log("Private Key PKCS1 Base64 DER:");
    console.log(privKeyPkcs1);

    var privKeyPkcs8 = privKey.GetPkcs8ENC("base64");
    console.log("Private Key PKCS8 Base64 DER:");
    console.log(privKeyPkcs8);


}

chilkatExample();