From a89dcb22ca549ae17742a8ee3c08f2d7fd606771 Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Wed, 5 Dec 2018 14:40:16 -0500
Subject: Tell libtfm that the ARM is little-endian, so it can optimize
 fp_read_unsigned_bin().

This enables some overflow-detection code, which fixes CT-01-009.

It also saves 484us/call, which adds up to 6.3ms/RSA signature.
---
 libraries/libtfm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/libtfm/Makefile b/libraries/libtfm/Makefile
index b50421c..359729b 100644
--- a/libraries/libtfm/Makefile
+++ b/libraries/libtfm/Makefile
@@ -38,7 +38,7 @@ STM32_LIBTFM_CFLAGS_OPTIMIZATION := -O3 -funroll-loops -fomit-frame-pointer
 endif
 
 CFLAGS := $(subst ${STM32_CFLAGS_OPTIMIZATION},${STM32_LIBTFM_CFLAGS_OPTIMIZATION},${CFLAGS})
-CFLAGS += -DTFM_ARM -Dasm=__asm__ -Wa,-mimplicit-it=thumb
+CFLAGS += -DTFM_ARM -DENDIAN_LITTLE -Dasm=__asm__ -Wa,-mimplicit-it=thumb
 CFLAGS += -I${LIBTFM_SRC}/tomsfastmath/src/headers
 CFLAGS += -DFP_MAX_SIZE="(${BITS}*2+(8*DIGIT_BIT))"
 CFLAGS += -Wall -W -Wshadow -Wno-uninitialized
-- 
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