Note that the functions are not released and encapsulate a kernel-function to write the key into the SecureStorage area - there will be no publicly available information on these as far as I am aware and are insecure to use (from a stability perspective).
What is publicly known about the SecureStorage area is that the call-stacks are protected to access the data again (particularly to decrypt) so I can't see how this would work in your own application because even within SAP only special programs are allowed to call the functions.
What data is the application trying to store? A password? Possibly there is a better way to deal with it in a secure manner.
Have you looked into the SSF (Secure Store & Forward) because you mentioned "signing a message"?
Cheers,
Julius
Edited by: Julius Bussche on Aug 5, 2010 10:21 PM