(PHP Extension) Generate a Random 256-bit AES Key and RSA Encrypt

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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.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

// 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 CkPublicKey();
// In all Chilkat methods expecting a path, you pass either absolute or relative paths.
$success = $pubKey->LoadFromFile('rsaKeys/Test2048Rsa.pem');
if ($success == false) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();

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

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

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

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

?>