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backport 401868908a (smallstack refactor of wc_ecc_mulmod_ex2()).

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Daniel Pouzzner
2025-12-17 13:04:57 -06:00
parent 4d0f78e7a4
commit 481db6f1ac
1 changed files with 9 additions and 5 deletions
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14
wolfcrypt/src/ecc.c
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@@ -3177,7 +3177,7 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
#endif
int i, err;
#ifdef WOLFSSL_SMALL_STACK_CACHE
ecc_key key;
ecc_key *key = NULL;
#endif
mp_digit mp;
#ifdef ECC_TIMING_RESISTANT
@@ -3198,10 +3198,13 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
XMEMSET(M, 0, sizeof(M));
#ifdef WOLFSSL_SMALL_STACK_CACHE
err = ecc_key_tmp_init(&key, heap);
key = (ecc_key *)XMALLOC(sizeof(*key), heap, DYNAMIC_TYPE_ECC);
if (key == NULL)
return MEMORY_E;
err = ecc_key_tmp_init(key, heap);
if (err != MP_OKAY)
goto exit;
R->key = &key;
R->key = key;
#endif /* WOLFSSL_SMALL_STACK_CACHE */
/* alloc ram for window temps */
@@ -3214,7 +3217,7 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
goto exit;
}
#ifdef WOLFSSL_SMALL_STACK_CACHE
M[i]->key = &key;
M[i]->key = key;
#endif
}
@@ -3288,7 +3291,8 @@ exit:
}
#ifdef WOLFSSL_SMALL_STACK_CACHE
R->key = NULL;
ecc_key_tmp_final(&key, heap);
ecc_key_tmp_final(key, heap);
XFREE(key, heap, DYNAMIC_TYPE_ECC);
#endif /* WOLFSSL_SMALL_STACK_CACHE */
return err;