openssl: how can i get public key from modulus

Question

I generate a pair of keys using openssl:

shell> ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/mike         


        

Answer 1

You can get the public key in a more standardized format using phpseclib, a pure PHP RSA implementation. eg.

loadKey(array('n' => $modulus, 'e' => $exponent));
$rsa->setPublicKey();

echo $rsa->getPublicKey();