Nestor22,  With the Perc 5/i you can't use SED's, the first controller that supported them was the H700. There isn't a software solution that I am aware of. Depending on the server you have you may consider the upgrade to the H700. If you let me know the model then I could let you know the compatibility and the part number. Let me know.
Hi! Only H700 and H800 controllers have Security Key Management in the BIOS Configuration Utility? I have PERC Perc 5i SAS RAID Controller and I want to use SED, what I can do? It is some software solution for key's management?  
RAID controller with SED (self-encrypting drives) support