(Node.js) Get Base64 Public Key from Private Key

Demonstrates how to get the public key in base64 format from a private key.

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() {

    // Load a private key from base64.
    var bd = new chilkat.BinData();
    var success = bd.AppendEncoded("MHQCA....n0Q==","base64");

    var privKey = new chilkat.PrivateKey();
    success = privKey.LoadAnyFormat(bd,"");
    if (success == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    // pubKey: PublicKey
    var pubKey = privKey.GetPublicKey();
    if (privKey.LastMethodSuccess == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    var pubKeyBase64 = pubKey.GetEncoded(true,"base64");
    console.log(pubKeyBase64);


}

chilkatExample();