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fix ec_p256r1

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NIIBE Yutaka
2014-02-19 11:36:27 +09:00
parent df4e8c5481
commit f5e8e94bf7
1 changed files with 15 additions and 13 deletions
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28
src/ec_p256r1.c
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@@ -429,22 +429,22 @@ compute_kP_p256r1 (ac *X, const bn256 *K, const ac *P)
memset (Q->z, 0, sizeof (bn256));
Q->z->word[0] = 1;
jpc_double (Q, Q);
jpc_add_ac (Q1, Q, P);
if (jpc_to_ac (P3, Q1) < 0) /* Never occurs, except coding errors. */
jpc_double_p256r1 (Q, Q);
jpc_add_ac_p256r1 (Q1, Q, P);
if (jpc_to_ac_p256r1 (P3, Q1) < 0) /* Never occurs, except coding errors. */
return -1;
jpc_double (Q, Q);
jpc_add_ac (Q1, Q, P);
if (jpc_to_ac (P5, Q1) < 0) /* Never occurs, except coding errors. */
jpc_double_p256r1 (Q, Q);
jpc_add_ac_p256r1 (Q1, Q, P);
if (jpc_to_ac_p256r1 (P5, Q1) < 0) /* Never occurs, except coding errors. */
return -1;
memcpy (Q->x, P3->x, sizeof (bn256));
memcpy (Q->y, P3->y, sizeof (bn256));
memset (Q->z, 0, sizeof (bn256));
Q->z->word[0] = 1;
jpc_double (Q, Q);
jpc_add_ac (Q1, Q, P);
if (jpc_to_ac (P7, Q1) < 0) /* Never occurs, except coding errors. */
jpc_double_p256r1 (Q, Q);
jpc_add_ac_p256r1 (Q1, Q, P);
if (jpc_to_ac_p256r1 (P7, Q1) < 0) /* Never occurs, except coding errors. */
return -1;
}
@@ -464,14 +464,16 @@ compute_kP_p256r1 (ac *X, const bn256 *K, const ac *P)
memset (Q->z, 0, sizeof (bn256)); /* infinity */
for (i = 85; i >= 0; i--)
{
jpc_double (Q, Q); jpc_double (Q, Q); jpc_double (Q, Q);
jpc_add_ac_signed (Q, Q, p_Pi[index[i]&0x03], index[i] >> 7);
jpc_double_p256r1 (Q, Q);
jpc_double_p256r1 (Q, Q);
jpc_double_p256r1 (Q, Q);
jpc_add_ac_signed_p256r1 (Q, Q, p_Pi[index[i]&0x03], index[i] >> 7);
}
dst = k_is_even ? Q : tmp;
jpc_add_ac (dst, Q, &precomputed_KG[0]);
jpc_add_ac_p256r1 (dst, Q, &precomputed_KG[0]);
return jpc_to_ac (X, Q);
return jpc_to_ac_p256r1 (X, Q);
}