frost/secp256k1-zkp
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Make secp256k1_fe_sqrt constant time

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This commit is contained in:
Pieter Wuille
2016-07-09 14:23:44 +02:00
parent e2a8e92125
commit 926836ad36
6 changed files with 24 additions and 14 deletions
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6
src/group_impl.h
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@@ -163,7 +163,7 @@ static void secp256k1_ge_clear(secp256k1_ge *r) {
secp256k1_fe_clear(&r->y);
}
static int secp256k1_ge_set_xquad_var(secp256k1_ge *r, const secp256k1_fe *x) {
static int secp256k1_ge_set_xquad(secp256k1_ge *r, const secp256k1_fe *x) {
secp256k1_fe x2, x3, c;
r->x = *x;
secp256k1_fe_sqr(&x2, x);
@@ -171,11 +171,11 @@ static int secp256k1_ge_set_xquad_var(secp256k1_ge *r, const secp256k1_fe *x) {
r->infinity = 0;
secp256k1_fe_set_int(&c, 7);
secp256k1_fe_add(&c, &x3);
return secp256k1_fe_sqrt_var(&r->y, &c);
return secp256k1_fe_sqrt(&r->y, &c);
}
static int secp256k1_ge_set_xo_var(secp256k1_ge *r, const secp256k1_fe *x, int odd) {
if (!secp256k1_ge_set_xquad_var(r, x)) {
if (!secp256k1_ge_set_xquad(r, x)) {
return 0;
}
secp256k1_fe_normalize_var(&r->y);