(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, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

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();