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bug fix for compute_kP

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NIIBE Yutaka 2014-01-28 09:59:26 +09:00
parent 42251eea8e
commit 6d2f9f8df1
2 changed files with 8 additions and 4 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2014-01-28 Niibe Yutaka <gniibe@fsij.org>
* src/ec_p256.c (get_vk_kP): Bug fix.
(compute_kP): Bug fix for index table.
2014-01-27 Niibe Yutaka <gniibe@fsij.org>
* src/ec_p256.c (get_vk_kP): New.

7
src/ec_p256.c
View File

@ -230,8 +230,7 @@ static const ac precomputed_2E_KG[15] = {
/*
* Generator of Elliptic curve over GF(p256)
*/
const bn256 *Gx = precomputed_KG[0].x;
const bn256 *Gy = precomputed_KG[0].y;
const ac *G = &precomputed_KG[0];
#endif
@ -354,7 +353,7 @@ get_vk_kP (const bn256 *K, int i)
uint8_t word_index = (blk * 3) + (pos / 11);
w = ((K->word[word_index] >> col) & 7);
if (pos == 10 || pos == 21)
if (word_index < 7 && (pos == 10 || pos == 21))
{
uint8_t mask;
uint8_t shift;
@ -451,7 +450,7 @@ compute_kP (ac *X, const bn256 *K, const ac *P)
/* Fill index. */
vk = get_vk_kP (K_dash, 0);
for (i = 1; i < 85; i++)
for (i = 1; i < 86; i++)
{
int vk_next, is_even;