I've managed to make it to work.
Here's how I did, maybe some other people will have the same problem:
First of all, I've downloaded from here:
http://sourceforge.net/project/showf...kage_id=254693 the openssh.z archive for AIX.
Second, I've downloaded from the IBM site the openssl archive .z for AIX.
Then, I've unarchived and install them both, with the smitty_install latest on both packages.
Thank you so much for your support.