(PHP Extension) Generate RSA Key and Export to Encrypted PEM

PHP Extension sample showing how to generate an RSA key and export to encrypted PEM.

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;
}

// Get the private key as unencrypted XML:
$keyXml = $rsa->exportPrivateKey();
print $keyXml . "\n";

// To encrypt the key -- meaning to get the key in
// an encrypted PEM format -- load it into a PrivateKey object,
// and then export to encrypted PEM:
$privKey = new CkPrivateKey();

$success = $privKey->LoadXml($keyXml);
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$strEncPem = $privKey->getPkcs8EncryptedPem('myPassword');

// You now have the private key in an encrypted format,
// which may be (for example) saved to a database

?>