CVSROOT: /cvs
Module name: src
Changes by: js...@cvs.openbsd.org 2023/02/02 11:39:26
Modified files:
lib/libcrypto/bn: bn_add.c
lib/libcrypto/bn/arch/amd64: bn_arch.c bn_arch.h
Log message:
Refactor BN_uadd() and BN_usub().
Unlike bn_add_words()/bn_sub_words(), the s2n-bignum bignum_add() and
bignum_sub() functions correctly handle inputs with differing word
lengths. This means that they can be called directly, without needing to
fix up any remaining words manually.
Split BN_uadd() in two - the default bn_add() implementation calls
bn_add_words(), before handling the carry for any remaining words.
Likewise split BN_usub() in two - the default bn_sub() implementation
calls bn_sub_words(), before handling the borrow for any remaining words.
On amd64, provide an implementation of bn_add() that calls s2n-bignum's
bignum_add() directly, similarly with an implementation of bn_sub() that
calls s2n-bignum's bignum_sub() directly.
ok tb@
