PHP Requires Chilkat v11.0.0+

Generate an RSA Key and Save to Encrypted PEM

See more RSA Examples

Demonstrates how to generate an RSA key and save to an encrypted PEM file. Chilkat2 PHP

<?php

use Chilkat2\PrivateKey;
use Chilkat2\PublicKey;
use Chilkat2\Rsa;

$rsa = new Rsa();

// Generate a 2048-bit key.
$privKey = new PrivateKey();
try {
    $rsa->GenKey(2048, $privKey);

    $password = 'secret';
    // Saving to a relative path (from the current working directory of the process).
    $path = 'rsaKeys/myTestRsaPrivate.pem';
    // Encrypt the PEM using 256-bit AES encryption.
    $privKey->Pkcs8EncryptAlg = 'aes256';
    $privKey->SavePkcs8EncryptedPemFile($password, $path);

    // 

    // We can also save the public key.
    // There is no need to encrypt public keys.
    $pubKey = new PublicKey();
    $privKey->ToPublicKey($pubKey);

    $path = 'rsaKeys/myTestRsaPublic.pem';
    // Choose PKCS1 or PKCS8
    // We'll choose PKCS8.
    $preferPkcs1 = false;
    $pubKey->SavePemFile($preferPkcs1, $path);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// 

echo "Success.\n";