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Fix for STM32 PKA with P521 and shared secret. ZD 19422

pull/8601/head
David Garske 2025-03-27 15:30:37 -07:00
parent 1c56a2674a
commit d235013fe9
1 changed files with 2 additions and 4 deletions
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6
wolfcrypt/src/port/st/stm32.c
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@ -702,7 +702,6 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
PKA_ECCMulInTypeDef pka_mul; PKA_ECCMulInTypeDef pka_mul;
PKA_ECCMulOutTypeDef pka_mul_res; PKA_ECCMulOutTypeDef pka_mul_res;
int szModulus; int szModulus;
int szkbin;
int status; int status;
int res; int res;
uint8_t Gxbin[STM32_MAX_ECC_SIZE]; uint8_t Gxbin[STM32_MAX_ECC_SIZE];
@ -730,9 +729,8 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
} }
szModulus = mp_unsigned_bin_size(modulus); szModulus = mp_unsigned_bin_size(modulus);
szkbin = mp_unsigned_bin_size(k);
res = stm32_get_from_mp_int(kbin, k, szkbin); res = stm32_get_from_mp_int(kbin, k, szModulus);
if (res == MP_OKAY) if (res == MP_OKAY)
res = stm32_get_from_mp_int(Gxbin, G->x, szModulus); res = stm32_get_from_mp_int(Gxbin, G->x, szModulus);
if (res == MP_OKAY) if (res == MP_OKAY)
@ -767,7 +765,7 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
pka_mul.modulus = prime; pka_mul.modulus = prime;
pka_mul.pointX = Gxbin; pka_mul.pointX = Gxbin;
pka_mul.pointY = Gybin; pka_mul.pointY = Gybin;
pka_mul.scalarMulSize = szkbin; pka_mul.scalarMulSize = szModulus;
pka_mul.scalarMul = kbin; pka_mul.scalarMul = kbin;
#ifdef WOLFSSL_STM32_PKA_V2 #ifdef WOLFSSL_STM32_PKA_V2
pka_mul.coefB = coefB; pka_mul.coefB = coefB;