We only host a keygen script for SoftwarePassport/Armadillo, if you happen to use that product to lock your software downloads:
http://www.e-junkie.com/ej/tips.keygen.softwarepassport-armadillo.htm
Otherwise, you would need to host the keygen script on your own Web site if you want to generate key codes on-demand for us to issue to your buyers. Another alternative would be using our Send Stored Codes feature, which allows you to simply paste a list of pre-generated codes into your product's settings in Seller Admin:
http://www.e-junkie.com/ej/help.selling-codes.htm
If you'd like some help setting any of this up, we can recommend the competent, E-junkie-experienced developers listed in our directory here:
http://www.e-junkie.com/ej/developer-directory.htm