将RSA公钥从网页中托管的Java applet提供给PHP脚本

Question

I have an applet hosted on a Web page. It communicates with a JavaCard and gets the Modulus and the exponent. I regenerate the key in that applet. All this is done on the client side.

My applet have 3 methods to get the public key modulus, the public key exponent and the PublicKey object. How can I use those 3 variables to reconstruc the key on the server side. By PHP if it is possible.

Answer 1

Using phpseclib, a pure PHP RSA implementation...

(this depends somewhat on the format of the exponent and modulus)

<?php
$key =  array(
    'exponent' => new Math_BigInteger($exponent, 256),
    'modulus' => new Math_BigInteger($modulus, 256)
);

$rsa = new Crypt_RSA();
$rsa->loadKey($key);
$rsa->setPublicKey($key);

echo $rsa->getPublicKey();