Soln : xylitol's Xyl Crypto-KeygenMe 2: rEvErs0rEd

A crypto keygen me by Xylitol.
The soln posted by me.
A simple keygen me using RSA-256 as protection.
Difficulty : 2;

Screenshot : http://photoserver.ws/images/HEeJ4c073982da15b.png
Link to crackme : http://crackmes.de/users/xylitol/xyl_crypto_keygenme_2_revers0red/
Link to soln : http://crackmes.de/users/xylitol/xyl_crypto_keygenme_2_revers0red/solutions/kkr_we_rule

Good day :)