Hi, I played with autotest offered by openssl, more precisely /test/evp_test. Is there a way to test vectors tests from NIST SP800-38A for CTR mode (only vectors from RFC 3686 are taillable in evptests.txt). I add the vectors in the files but the results are not the expected results. Is there a link with endianess? I read in the code (extract from /crypto/modes/ctr128.c) : /* NOTE: the IV/counter CTR mode is big-endian. The code itself * is endian-neutral. */ Maybe i have to modified IV before passing it to openssl? Thanks