CVSROOT: /cvs
Module name: src
Changes by: js...@cvs.openbsd.org 2025/05/24 22:30:55
Modified files:
lib/libcrypto/bn: bn_internal.h bn_local.h
Added files:
lib/libcrypto/bn: bn_add_sub.c
Log message:
Provide additional variants of bn_add_words()/bn_sub_words().
Move bn_add_words() and bn_sub_words() from bn_add.c to bn_add_sub.c.
These have effectively been replaced in the previous rewrites. Remove
the asserts - if bad lengths are passed the results will be incorrect
and things will fail (these should use size_t instead of int, but that
is a problem for another day).
Provide bn_sub_words_borrow(), which computes a subtraction but only
returns the resulting borrow. Provide bn_add_words_masked() and
bn_sub_words_masked(), which perform an masked addition or subtraction.
These can also be used to implement constant time addition and subtraction,
especially for reduction.
ok beck@ tb@
