PHP Requires Chilkat v11.0.0+

Generate a Random 256-bit AES Key and RSA Encrypt

See more RSA Examples

Generates a random 256-bit AES key and encrypts using an RSA public key. Only the owner of the RSA private key will be able to decrypt the AES key. Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\Prng;
use Chilkat2\PublicKey;
use Chilkat2\Rsa;

// The RSA public key is used for encryption, and the private key for decryption.

// The public key's role is to make encryption accessible to anyone while ensuring that
// only the private key holder can decrypt the messages.
// The public key is designed to be widely distributed so anyone can use it to encrypt messages
// intended for the owner of the private key.

// Load our 2048-bit RSA public key.
$pubKey = new PublicKey();
// In all Chilkat methods expecting a path, you pass either absolute or relative paths.
try {
    $pubKey->LoadFromFile('rsaKeys/Test2048Rsa.pem');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$rsa = new Rsa();

// Tell RSA to use the public key.
$rsa->UsePublicKey($pubKey);

// Generate a random 256-bit AES key (32 bytes)
$bdAesKey = new BinData();
$prng = new Prng();
$prng->GenRandomBd(32, $bdAesKey);

// RSA encrypt.
$rsa->EncryptBd($bdAesKey, false);

// Save the RSA encrypted AES key to a file.
$bdAesKey->WriteFile('rsaEncrypted/myAes.key');