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group: Simplify secp256k1_ge_set_all_gej

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Tim Ruffing
2024-10-08 13:54:41 +02:00
committed by Tim Ruffing
parent d3082ddead
commit 365f274ce3
1 changed files with 12 additions and 20 deletions
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32
src/group_impl.h
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@@ -198,7 +198,6 @@ static void secp256k1_ge_set_gej_var(secp256k1_ge *r, secp256k1_gej *a) {
static void secp256k1_ge_set_all_gej(secp256k1_ge *r, const secp256k1_gej *a, size_t len) { static void secp256k1_ge_set_all_gej(secp256k1_ge *r, const secp256k1_gej *a, size_t len) {
secp256k1_fe u; secp256k1_fe u;
size_t i; size_t i;
size_t last_i = SIZE_MAX;
#ifdef VERIFY #ifdef VERIFY
for (i = 0; i < len; i++) { for (i = 0; i < len; i++) {
SECP256K1_GEJ_VERIFY(&a[i]); SECP256K1_GEJ_VERIFY(&a[i]);
@@ -206,29 +205,22 @@ static void secp256k1_ge_set_all_gej(secp256k1_ge *r, const secp256k1_gej *a, si
} }
#endif #endif
for (i = 0; i < len; i++) { if (len == 0) {
/* Use destination's x coordinates as scratch space */
if (last_i == SIZE_MAX) {
r[i].x = a[i].z;
} else {
secp256k1_fe_mul(&r[i].x, &r[last_i].x, &a[i].z);
}
last_i = i;
}
if (last_i == SIZE_MAX) {
return; return;
} }
secp256k1_fe_inv(&u, &r[last_i].x);
i = last_i; /* Use destination's x coordinates as scratch space */
while (i > 0) { r[0].x = a[0].z;
i--; for (i = 1; i < len; i++) {
secp256k1_fe_mul(&r[last_i].x, &r[i].x, &u); secp256k1_fe_mul(&r[i].x, &r[i - 1].x, &a[i].z);
secp256k1_fe_mul(&u, &u, &a[last_i].z);
last_i = i;
} }
VERIFY_CHECK(!a[last_i].infinity); secp256k1_fe_inv(&u, &r[len - 1].x);
r[last_i].x = u;
for (i = len - 1; i > 0; i--) {
secp256k1_fe_mul(&r[i].x, &r[i - 1].x, &u);
secp256k1_fe_mul(&u, &u, &a[i].z);
}
r[0].x = u;
for (i = 0; i < len; i++) { for (i = 0; i < len; i++) {
secp256k1_ge_set_gej_zinv(&r[i], &a[i], &r[i].x); secp256k1_ge_set_gej_zinv(&r[i], &a[i], &r[i].x);