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clean up

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NIIBE Yutaka
2014-01-27 11:26:58 +09:00
parent e18df3af6b
commit fc5df5019f
1 changed files with 5 additions and 5 deletions
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8
src/ec_p256.c
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@@ -357,13 +357,14 @@ compute_naf4_257 (naf4_257 *NAF_K, const bn256 *K)
{ {
int i = 0; int i = 0;
bn256 K_tmp[1]; bn256 K_tmp[1];
uint32_t carry = 0;
memcpy (K_tmp, K, sizeof (bn256)); memcpy (K_tmp, K, sizeof (bn256));
memset (NAF_K, 0, sizeof (naf4_257)); memset (NAF_K, 0, sizeof (naf4_257));
while (!bn256_is_zero (K_tmp)) while (!bn256_is_zero (K_tmp))
{ {
uint32_t carry = 0;
if (bn256_is_even (K_tmp)) if (bn256_is_even (K_tmp))
naf4_257_set (NAF_K, i, 0); naf4_257_set (NAF_K, i, 0);
else else
@@ -383,10 +384,7 @@ compute_naf4_257 (naf4_257 *NAF_K, const bn256 *K)
bn256_shift (K_tmp, K_tmp, -1); bn256_shift (K_tmp, K_tmp, -1);
if (carry) if (carry)
{
K_tmp->word[7] |= 0x80000000; K_tmp->word[7] |= 0x80000000;
carry = 0;
}
i++; i++;
} }
} }
@@ -442,6 +440,8 @@ compute_kP (ac *X, const naf4_257 *NAF_K, const ac *P)
jpc Q[1]; jpc Q[1];
ac P3[1], P5[1], P7[1]; ac P3[1], P5[1], P7[1];
const ac *p_Pi[4]; const ac *p_Pi[4];
uint8_t index[64]; /* Lower 4-bit for index absolute value, msb is
for sign (encoded as: 0 means 1, 1 means -1). */
if (point_is_on_the_curve (P) < 0) if (point_is_on_the_curve (P) < 0)
return -1; return -1;