Am Donnerstag, 5. März 2020, 11:22:55 CET schrieb Andrei Botila: Hi Andrei, > From: Andrei Botila <andrei.botila@xxxxxxx> > > Through this RFC we try to standardize the way input lengths equal to 0 > are handled in all skcipher algorithms. Currently, in xts when an input > has a length smaller than XTS_BLOCK_SIZE it returns -EINVAL while the > other algorithms return 0 for input lengths equal to zero. > The algorithms that implement this check are CBC, ARC4, CFB, OFB, SALSA20, > CTR, ECB and PCBC, XTS being the outlier here. All of them call > skcipher_walk_virt() which returns 0 if skcipher_walk_skcipher() finds > that input length is equal to 0. > This case was discovered when fuzz testing was enabled since it generates > this input length. > This RFC wants to find out if the approach is ok before updating the > other xts implementations. It may be a good idea to consolidate that. However, changing only one implementation is not good. All XTS implementations would need to be converted then. Ciao Stephan
