openbsd/src/lib/libcrypto/bn/bn_primitives.c, branch OPENBSD_7_9A mirror of https://github.com/libressl/openbsd.git
https://git.lua4.win/openbsd/atom?h=OPENBSD_7_92023-06-21T07:48:41+00:00Provide and use bn_clzw() in place of bn_word_clz().2023-06-21T07:48:41+00:00jsing2023-06-21T07:48:41+00:00urn:sha1:b0edbf3f98eba4b1effd31584dae0af06eb2deff
On some architectures, we can provide an optimised (often single
instruction) count-leading-zero implementation. In order to do this
effectively, provide bn_clzw() as a static inline that can be replaced
by an architecture specific version. The default implementation defers
to the bn_word_clz() function (which may also be architecture specific).
ok tb@
Make BN_num_bits() independent of bn->top.2023-06-21T07:41:55+00:00jsing2023-06-21T07:41:55+00:00urn:sha1:88e97173c6cf4f4ec8c6138cff25d7b1c51a54e9
Provide bn_bitsize(), which performs a constant time scan of a BN in order
to determine the bit size of the BN value. Use this for BN_num_bits() such
that it is no longer dependent on the bn->top value.
ok tb@