(PHP ActiveX) Generate RSA Key and return Base64 PKCS8 Private Key

Demonstrates how to generate a new 2048-bit RSA private key and returns the Base64 encoded PKCS8 representation of the private key.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

// Generate a 2048-bit key.  Chilkat RSA supports
// key sizes ranging from 512 bits to 8192 bits.
$success = $rsa->GenerateKey(2048);
if ($success != 1) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// privKey is a Chilkat.PrivateKey
$privKey = $rsa->ExportPrivateKeyObj();

// Get the private key in PKCS8 Base64 format
$privKeyPkcs8Base64 = $privKey->getPkcs8ENC('base64');

// The key in base64 format will start similar to this:
// MIIEvAIBADANBgkqhkiG9w0BA...
print $privKeyPkcs8Base64 . "\n";

?>