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Make uECC_RNG_NUM_TRIES modifiable at compile time.

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This commit is contained in:
Ken MacKay
2015-10-12 21:29:56 -07:00
parent 74f6d2d9d7
commit e9ac0d230b
1 changed files with 8 additions and 6 deletions
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uECC.c
+8 -6
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@@ -2,7 +2,9 @@
#include "uECC.h"
#define MAX_TRIES 64
#ifndef uECC_RNG_MAX_TRIES
#define uECC_RNG_MAX_TRIES 64
#endif
#if uECC_SUPPORTS_secp160r1
#define uECC_MAX_BYTES 21 /* Due to the size of curve_n. */
@@ -865,7 +867,7 @@ int uECC_make_key(uint8_t *public_key,
/* Zero out correctly (to compare to curve->n) for secp160r1. */
private[curve->num_n_words - 1] = 0;
for (tries = 0; tries < MAX_TRIES; ++tries) {
for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
if (!generate_random_int(private, curve->num_words, curve->num_bytes * 8)) {
return 0;
}
@@ -906,7 +908,7 @@ int uECC_shared_secret(const uint8_t *public_key,
/* If an RNG function was specified, try to get a random initial Z value to improve
protection against side-channel attacks. */
if (g_rng_function) {
for (tries = 0; tries < MAX_TRIES; ++tries) {
for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
if (!generate_random_int(p2[carry], curve->num_words, curve->num_bytes * 8)) {
return 0;
}
@@ -1029,7 +1031,7 @@ static int uECC_sign_with_k(const uint8_t *private_key,
tmp[0] = 1;
} else {
uECC_word_t tries;
for (tries = 0; tries < MAX_TRIES; ++tries) {
for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
if (!generate_random_int(tmp, curve->num_n_words, num_n_bits)) {
return 0;
}
@@ -1074,7 +1076,7 @@ int uECC_sign(const uint8_t *private_key,
uECC_word_t tries;
bitcount_t num_n_bits = uECC_vli_numBits(curve->n, curve->num_n_words);
for (tries = 0; tries < MAX_TRIES; ++tries) {
for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
if (!generate_random_int(k, curve->num_n_words, num_n_bits)) {
return 0;
}
@@ -1170,7 +1172,7 @@ int uECC_sign_deterministic(const uint8_t *private_key,
update_V(hash_context, K, V);
for (tries = 0; tries < MAX_TRIES; ++tries) {
for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
uECC_word_t T[uECC_MAX_WORDS];
uint8_t *T_ptr = (uint8_t *)T;
wordcount_t T_bytes = 0;