How can I change user's key pair generated by owncloud and integrate my own keys

I understand owncloud genenrate some key pair for a single user in order to encryp files, however we need to use some previously generated key pair instead. How could we substitute the ones that owncloud created by the ones we already have?. This requeriment is neccesary in order to have a unique key pair for many services(these services are working on now).

Thank you in advance.

I don't think this is possible. Please contact sales at owncloud dot com and enquire about our upcming E2EE solution maybe this fits for this requirement.