Generate RSA Public/Private Key Pair and Export to PEM

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

Download 32-bit Chilkat RSA ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php

$rsa = new COM("Chilkat.Rsa");

$success = $rsa->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print 'RSA component unlock failed' . "\n";
    exit;
}

//  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 COM("Chilkat.PrivateKey");
$privKey->LoadXml($privateKeyXml);
$privKey->SaveRsaPemFile('privateKey.pem');

//  Save the public key in PEM format:
$pubKey = new COM("Chilkat.PublicKey");
$pubKey->LoadXml($publicKeyXml);
$pubKey->SaveOpenSslPemFile('publicKey.pem');
?>