On Thu, May 20, 2021 at 4:02 AM yu li <y...@nvidia.com> wrote: > > Thank you for your reply. > > All test vector in > https://github.com/weidai11/cryptopp/blob/master/TestVectors/xts.txt. are > byte-aligned . I've tested these vectors locally, and they're all pass. But > it doesn't have a non-byte-aligned vector like datalen=250bit in > https://github.com/weidai11/cryptopp/blob/master/TestVectors/xts.txt. We can > found non-byte-aligned vector in > https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/CAVP-TESTING-BLOCK-CIPHER-MODES#XTS > . All byte-aligned vector in > https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/CAVP-TESTING-BLOCK-CIPHER-MODES#XTS > can pass， but all non-byte-aligned vector are fail.
My bad Yu. I took alignment to mean type alignment. Sorry about that. XTS mode in Crypto++ is byte oriented, not bit oriented. We could possibly change that. I'm looking at https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/aes/XTSVS.pdf, and it says (from p. 6): An implementation may support a data unit length that is not a multiple of 8 bits. In this case, the plaintext (PT) and ciphertext (CT) will be represented in the request, sample, and response files by a bit string padded with zeros on the right to the next byte boundary, in hexadecimal. For example, suppose an implementation supports a 137 bit data unit. The first 128-bit block consists of the first (i.e., leftmost) 128 bits. If the second, nine-bit partial block is 011011011, then in the request and sample files it will be padded with seven zeros on the right – 0110 1101 1000 0000 – and represented as 6d80 (hex). Response files values should be formatted the same way. The values seem non-sensical to me. Where did 137-bit data unit come from? That's going to be a sector size in real life, so its going to be 512, 2048, 4096, 64k, etc. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8mVJ0tPby4uJdQK6xtC%3D1ag7jqvV1fFKf-nU1mb94e0zg%40mail.gmail.com.
