(PHP Extension) Duplicate openssl pkey -in private.pem -pubout -out pubkey.pem

How to output the public part of a private key: Demonstrates how to duplicate this OpenSSL command:

openssl pkey -in private.pem -pubout -out pubkey.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");

$pkey = new CkPrivateKey();

// Load the private key from an PEM file:
$success = $pkey->LoadPemFile('private.pem');
if ($success != true) {
    print $pkey->lastErrorText() . "\n";
    exit;
}

// pubKey is a CkPublicKey
$pubKey = $pkey->GetPublicKey();
if ($pkey->get_LastMethodSuccess() == false) {
    print $pkey->lastErrorText() . "\n";
    exit;
}

$success = $pubKey->SavePemFile(false,'pubKey.pem');
if ($success != true) {
    print $pubKey->lastErrorText() . "\n";

    exit;
}

print 'Success.' . "\n";


?>