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Generate the correct number of bits for k when num_n_words != num_words.

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Ken MacKay
2015-10-12 21:29:56 -07:00
parent ac6de20ea5
commit dfcc9b4ec5
1 changed files with 10 additions and 6 deletions
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uECC.c
+10 -6
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@@ -1149,16 +1149,20 @@ int uECC_sign_deterministic(const uint8_t *private_key,
uECC_word_t T[uECC_MAX_WORDS];
uint8_t *T_ptr = (uint8_t *)T;
unsigned T_bytes = 0;
while (T_bytes < curve->num_words * uECC_WORD_SIZE) {
for (;;) {
update_V(hash_context, K, V);
for (i = 0; i < hash_context->result_size && T_bytes < sizeof(T); ++i, ++T_bytes) {
T_ptr[T_bytes] = V[i];
for (i = 0; i < hash_context->result_size; ++i) {
T_ptr[T_bytes++] = V[i];
if (T_bytes >= curve->num_n_words * uECC_WORD_SIZE) {
goto filled;
}
}
}
if ((bitcount_t)curve->num_words * uECC_WORD_SIZE * 8 > num_n_bits) {
filled:
if ((bitcount_t)curve->num_n_words * uECC_WORD_SIZE * 8 > num_n_bits) {
wordcount_t mask = (wordcount_t)-1;
T[curve->num_words - 1] &=
mask >> ((bitcount_t)(curve->num_words * uECC_WORD_SIZE * 8 - num_n_bits));
T[curve->num_n_words - 1] &=
mask >> ((bitcount_t)(curve->num_n_words * uECC_WORD_SIZE * 8 - num_n_bits));
}
if (uECC_sign_with_k(private_key, message_hash, T, signature, curve)) {