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Optimize memory usage for ARM Cortex M and similar embedded systems (#578)

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* Changed ge_precomp data to const to reduce RAM usage on embedded systems.
* Add configuration option "WOLFSSL_NRF5x" for Nordic nRF5x platform in settings.h
This commit is contained in:
keton
2016-10-06 21:49:14 +02:00
committed by dgarske
parent f4c654dd6e
commit ef5f55f6e4
2 changed files with 23 additions and 3 deletions
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6
wolfcrypt/src/ge_operations.c
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@ -758,7 +758,7 @@ static unsigned char negative(signed char b)
} }
static void cmov(ge_precomp *t,ge_precomp *u,unsigned char b) static void cmov(ge_precomp *t,const ge_precomp *u,unsigned char b)
{ {
fe_cmov(t->yplusx,u->yplusx,b); fe_cmov(t->yplusx,u->yplusx,b);
fe_cmov(t->yminusx,u->yminusx,b); fe_cmov(t->yminusx,u->yminusx,b);
@ -767,7 +767,7 @@ static void cmov(ge_precomp *t,ge_precomp *u,unsigned char b)
/* base[i][j] = (j+1)*256^i*B */ /* base[i][j] = (j+1)*256^i*B */
static ge_precomp base[32][8] = { static const ge_precomp base[32][8] = {
{ {
{ {
{ 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 }, { 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 },
@ -2222,7 +2222,7 @@ static void slide(signed char *r,const unsigned char *a)
} }
static ge_precomp Bi[8] = { static const ge_precomp Bi[8] = {
{ {
{ 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 }, { 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 },
{ -12545711,934262,-2722910,3049990,-727428,9406986,12720692,5043384,19500929,-15469378 }, { -12545711,934262,-2722910,3049990,-727428,9406986,12720692,5043384,19500929,-15469378 },

20
wolfssl/wolfcrypt/settings.h
View File

@ -124,6 +124,9 @@
/* Uncomment next line if building for VxWorks */ /* Uncomment next line if building for VxWorks */
/* #define WOLFSSL_VXWORKS */ /* #define WOLFSSL_VXWORKS */
/* Uncomment next line if building for Nordic nRF5x platofrm */
/* #define WOLFSSL_NRF5x */
/* Uncomment next line to enable deprecated less secure static DH suites */ /* Uncomment next line to enable deprecated less secure static DH suites */
/* #define WOLFSSL_STATIC_DH */ /* #define WOLFSSL_STATIC_DH */
@ -401,6 +404,23 @@
#define SINGLE_THREADED /* Not ported at this time */ #define SINGLE_THREADED /* Not ported at this time */
#endif #endif
#ifdef WOLFSSL_NRF5x
#define SIZEOF_LONG 4
#define SIZEOF_LONG_LONG 8
#define NO_ASN_TIME
#define NO_DEV_RANDOM
#define NO_FILESYSTEM
#define NO_MAIN_DRIVER
#define NO_WRITEV
#define SINGLE_THREADED
#define USE_FAST_MATH
#define TFM_TIMING_RESISTANT
#define USE_WOLFSSL_MEMORY
#define WOLFSSL_NRF51
#define WOLFSSL_USER_IO
#define NO_SESSION_CACHE
#endif
/* Micrium will use Visual Studio for compilation but not the Win32 API */ /* Micrium will use Visual Studio for compilation but not the Win32 API */
#if defined(_WIN32) && !defined(MICRIUM) && !defined(FREERTOS) && \ #if defined(_WIN32) && !defined(MICRIUM) && !defined(FREERTOS) && \
!defined(FREERTOS_TCP) && !defined(EBSNET) && !defined(WOLFSSL_EROAD) && \ !defined(FREERTOS_TCP) && !defined(EBSNET) && !defined(WOLFSSL_EROAD) && \