PHP Extension

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. PHP Extension

<?php

include("chilkat.php");

$success = false;

// 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.
$rsa->UsePublicKey($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');

?>