From 92cb16e8103da998aa1bf226d24ef6771a92c5d5 Mon Sep 17 00:00:00 2001
From: J08nY
Date: Thu, 20 Feb 2020 15:06:18 +0100
Subject: Allocate and initialize formula variables only once.

---
 pyecsca/codegen/bn/bn.c | 5 +++++
 pyecsca/codegen/bn/bn.h | 1 +
 2 files changed, 6 insertions(+)

(limited to 'pyecsca/codegen/bn')

diff --git a/pyecsca/codegen/bn/bn.c b/pyecsca/codegen/bn/bn.c
index 635eaae..c953119 100644
--- a/pyecsca/codegen/bn/bn.c
+++ b/pyecsca/codegen/bn/bn.c
@@ -72,6 +72,11 @@ void bn_mod_sub(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out)
 	mp_submod(one, other, mod, out);
 }
 
+void bn_mod_neg(const bn_t *one, const bn_t *mod, bn_t *out) {
+	mp_neg(one, out);
+	mp_mod(out, mod, out);
+}
+
 void bn_mod_mul(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out) {
 	mp_mulmod(one, other, mod, out);
 }
diff --git a/pyecsca/codegen/bn/bn.h b/pyecsca/codegen/bn/bn.h
index a5b1ba9..e323170 100644
--- a/pyecsca/codegen/bn/bn.h
+++ b/pyecsca/codegen/bn/bn.h
@@ -41,6 +41,7 @@ void bn_rand_mod_reduce(bn_t *out, const bn_t *mod);
 
 void bn_mod_add(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out);
 void bn_mod_sub(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out);
+void bn_mod_neg(const bn_t *one, const bn_t *mod, bn_t *out);
 void bn_mod_mul(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out);
 void bn_mod_sqr(const bn_t *one, const bn_t *mod, bn_t *out);
 void bn_mod_div(const bn_t *one, const bn_t *other, const bn_t *mod, bn_t *out);
-- 
cgit v1.3.1