(JavaScript) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES key.

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// 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 CkPrng();
var bdAesKey = new CkBinData();
success = prng.GenRandomBd(32,bdAesKey);

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

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

var pubKey = new CkPublicKey();
cert.GetPublicKey(pubKey);

var rsa = new CkRsa();
success = rsa.UsePublicKey(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);