is the psx save format psv digital signature still not known? i ask because its needed for memcardrex to export valid saves to psv format. this would eliminate the need for a cfw psp/ps3
I can't find any evidence that it is known, or Black Chocobo would support it. http://forums.qhimm.com/index.php?topic=15913.0
I believe the PSP hashes PS1 memory card images using kirk. There are open source implementations of the PSP kirk and PSP save file encrypt/decrypt tools for PC which do use the PSP kirk for encryption/decryption. So at this point it must be doable.