(Node.js) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES 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() {

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

    // First generate a 256-bit AES key (32 bytes).
    var prng = new chilkat.Prng();
    var bdAesKey = new chilkat.BinData();
    var success = prng.GenRandomBd(32,bdAesKey);

    // Use a public key from a certificate for RSA encryption.
    var cert = new chilkat.Cert();

    success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    // pubKey: PublicKey
    var pubKey = cert.ExportPublicKey();
    if (cert.LastMethodSuccess !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    var rsa = new chilkat.Rsa();
    success = rsa.ImportPublicKeyObj(pubKey);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    // RSA encrypt our 32-byte AES key.
    // The contents of bdAesKey are replaced with result of the RSA encryption.
    success = rsa.EncryptBd(bdAesKey,false);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Return the result as a base64 string
    var encryptedAesKey = bdAesKey.GetEncoded("base64");

    console.log("encrypted AES key = " + encryptedAesKey);

}

chilkatExample();