(PHP Extension) Generate RSA Public/Private Key Pair and Export to PEM

PHP Extension example code showing how to generate an RSA public/private key pair and export to PEM files.

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

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$rsa = new CkRsa();

// Generate a 1024-bit key.  Chilkat RSA supports
// key sizes ranging from 512 bits to 4096 bits.
$success = $rsa->GenerateKey(1024);
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

// Keys are exported in XML format:
$publicKeyXml = $rsa->exportPublicKey();
print $publicKeyXml . "\n";

$privateKeyXml = $rsa->exportPrivateKey();
print $privateKeyXml . "\n";

// Save the private key in PEM format:
$privKey = new CkPrivateKey();
$success = $privKey->LoadXml($privateKeyXml);
$success = $privKey->SavePemFile('privateKey.pem');

// Save the public key in PEM format:
$pubKey = new CkPublicKey();
$success = $pubKey->LoadFromString($publicKeyXml);
$success = $pubKey->SavePemFile(false,'publicKey.pem');

?>