(PHP ActiveX) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

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

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// 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
$success = $rsa->GenerateKey(2048);
if ($success != 1) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// Get the public part of the key.
// pubKey is a Chilkat.PublicKey
$pubKey = $rsa->ExportPublicKeyObj();

// There are two possible formats for representing the RSA public key 
// in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
// We can get either by setting bChoosePkcs1 to 1 or 0.
$bChoosePkcs1 = 1;
$pubKeyBase64Der = $pubKey->getEncoded($bChoosePkcs1,'base64');
print 'Public Key Base64 DER:' . "\n";
print $pubKeyBase64Der . "\n";

// Now get the private key as Base64 DER:
// Get the private part of the key.
// (Note: A public key is actually just a subset of the private key.  
//  If you have the private key, you also have the public key.
//  Thus Chilkat provides a method to get the public key from the private key.)
// privKey is a Chilkat.PrivateKey
$privKey = $rsa->ExportPrivateKeyObj();

// Again, we can get PKCS1 or PKCS8, but with different methods:
$privKeyPkcs1 = $privKey->getPkcs1ENC('base64');
print 'Private Key PKCS1 Base64 DER:' . "\n";
print $privKeyPkcs1 . "\n";

$privKeyPkcs8 = $privKey->getPkcs8ENC('base64');
print 'Private Key PKCS8 Base64 DER:' . "\n";
print $privKeyPkcs8 . "\n";


?>