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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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25
src/group_impl.h
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@@ -66,6 +66,31 @@ void static secp256k1_ge_set_gej(secp256k1_ge_t *r, secp256k1_gej_t *a) {
r->y = a->y;
}
void static secp256k1_ge_set_all_gej(size_t len, secp256k1_ge_t r[len], const secp256k1_gej_t a[len]) {
int count = 0;
secp256k1_fe_t az[len];
for (int i=0; i<len; i++) {
if (!a[i].infinity) {
az[count++] = a[i].z;
}
}
secp256k1_fe_t azi[count];
secp256k1_fe_inv_all_var(count, azi, az);
count = 0;
for (int i=0; i<len; i++) {
r[i].infinity = a[i].infinity;
if (!a[i].infinity) {
secp256k1_fe_t *zi = &azi[count++];
secp256k1_fe_t zi2; secp256k1_fe_sqr(&zi2, zi);
secp256k1_fe_t zi3; secp256k1_fe_mul(&zi3, &zi2, zi);
secp256k1_fe_mul(&r[i].x, &a[i].x, &zi2);
secp256k1_fe_mul(&r[i].y, &a[i].y, &zi3);
}
}
}
void static secp256k1_gej_set_infinity(secp256k1_gej_t *r) {
r->infinity = 1;
}