Import customer data from Prestashop

Hello,
my company had Prestashop running and i made a new webshop with Opencart. I managed to export the "ps_customers" SQL table and modify the information like "customer_id" "newsletter" to match the oc_customers standard. I then renamed the ps_customers table to oc_customers and it sucessfully shows up every customer in the admin panel.

But i dont get the passwords working.

I followed this instruction:
http://forum.opencart.com/viewtopic.php ... 86#p471886

In the settings.inc of prestashop theres a encryption key stored named "define('_RIJNDAEL_KEY"

I copied this key into my customer.php according to the thread mentioned above but its not working somehow. Think i need to change the code a little bit more but i dont know how ... I didnt modified or inserted anything else just inserted the encryption key and copied the other code lines.

Did you solve the problem with password? I have the same dilema