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Fix for STM32 PKA ECC point mapping, which is handled in hardware.

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This commit is contained in:
David Garske 2021-05-25 16:03:41 -07:00
parent 7b6005d467
commit 98ab62ea74
1 changed files with 16 additions and 7 deletions
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23
wolfcrypt/src/port/st/stm32.c
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@ -594,7 +594,7 @@ static int stm32_get_ecc_specs(const uint8_t **prime, const uint8_t **coef,
*GenPointX = stm32_ecc256_pointX;
*GenPointY = stm32_ecc256_pointY;
*coef_sign = &stm32_ecc256_coef_sign;
*order = stm32_ecc256_order;
if (order) *order = stm32_ecc256_order;
break;
#ifdef ECC224
case 28:
@ -603,7 +603,7 @@ static int stm32_get_ecc_specs(const uint8_t **prime, const uint8_t **coef,
*GenPointX = stm32_ecc224_pointX;
*GenPointY = stm32_ecc224_pointY;
*coef_sign = &stm32_ecc224_coef;
*order = stm32_ecc224_order;
if (order) *order = stm32_ecc224_order;
break;
#endif
#ifdef ECC192
@ -613,7 +613,7 @@ static int stm32_get_ecc_specs(const uint8_t **prime, const uint8_t **coef,
*GenPointX = stm32_ecc192_pointX;
*GenPointY = stm32_ecc192_pointY;
*coef_sign = &stm32_ecc192_coef;
*order = stm32_ecc192_order;
if (order) *order = stm32_ecc192_order;
break;
#endif
#ifdef ECC384
@ -623,7 +623,7 @@ static int stm32_get_ecc_specs(const uint8_t **prime, const uint8_t **coef,
*GenPointX = stm32_ecc384_pointX;
*GenPointY = stm32_ecc384_pointY;
*coef_sign = &stm32_ecc384_coef;
*order = stm32_ecc384_order;
if (order) *order = stm32_ecc384_order;
break;
#endif
default:
@ -658,7 +658,7 @@ int wc_ecc_mulmod_ex(const mp_int *k, ecc_point *G, ecc_point *R, mp_int* a,
uint8_t kbin[STM32_MAX_ECC_SIZE];
uint8_t PtXbin[STM32_MAX_ECC_SIZE];
uint8_t PtYbin[STM32_MAX_ECC_SIZE];
const uint8_t *prime, *coef, *gen_x, *gen_y, *order;
const uint8_t *prime, *coef, *gen_x, *gen_y;
const uint32_t *coef_sign;
(void)a;
(void)heap;
@ -685,10 +685,9 @@ int wc_ecc_mulmod_ex(const mp_int *k, ecc_point *G, ecc_point *R, mp_int* a,
size = (uint8_t)szModulus;
/* find STM32_PKA friendly parameters for the selected curve */
if (0 != stm32_get_ecc_specs(&prime, &coef, &coef_sign, &gen_x, &gen_y, &order, size)) {
if (0 != stm32_get_ecc_specs(&prime, &coef, &coef_sign, &gen_x, &gen_y, NULL, size)) {
return ECC_BAD_ARG_E;
}
(void)order;
pka_mul.modulusSize = szModulus;
pka_mul.coefSign = *coef_sign;
@ -731,6 +730,16 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
return wc_ecc_mulmod_ex(k, G, R, a, modulus, map, heap);
}
int ecc_map_ex(ecc_point* P, mp_int* modulus, mp_digit mp, int ct)
{
/* this is handled in hardware, so no projective mapping needed */
(void)P;
(void)modulus;
(void)mp;
(void)ct;
return MP_OKAY;
}
int stm32_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
word32 hashlen, int* res, ecc_key* key)
{