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Use batch inversion in G precomputation

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This commit is contained in:
Peter Dettman
2014-07-02 16:01:26 +07:00
parent 83fd36c6f8
commit f16be77ffc
6 changed files with 190 additions and 25 deletions
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48
src/field_impl.h
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@@ -214,6 +214,54 @@ void static secp256k1_fe_inv_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
#endif
}
void static secp256k1_fe_inv_all(size_t len, secp256k1_fe_t r[len], const secp256k1_fe_t a[len]) {
if (len < 1)
return;
assert((r + len <= a) || (a + len <= r));
r[0] = a[0];
int i = 0;
while (++i < len) {
secp256k1_fe_mul(&r[i], &r[i - 1], &a[i]);
}
secp256k1_fe_t u; secp256k1_fe_inv(&u, &r[--i]);
while (i > 0) {
int j = i--;
secp256k1_fe_mul(&r[j], &r[i], &u);
secp256k1_fe_mul(&u, &u, &a[j]);
}
r[0] = u;
}
void static secp256k1_fe_inv_all_var(size_t len, secp256k1_fe_t r[len], const secp256k1_fe_t a[len]) {
if (len < 1)
return;
assert((r + len <= a) || (a + len <= r));
r[0] = a[0];
int i = 0;
while (++i < len) {
secp256k1_fe_mul(&r[i], &r[i - 1], &a[i]);
}
secp256k1_fe_t u; secp256k1_fe_inv_var(&u, &r[--i]);
while (i > 0) {
int j = i--;
secp256k1_fe_mul(&r[j], &r[i], &u);
secp256k1_fe_mul(&u, &u, &a[j]);
}
r[0] = u;
}
void static secp256k1_fe_start(void) {
static const unsigned char secp256k1_fe_consts_p[] = {
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,