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secp256k1_fe_sqrt checks for success

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- secp256k1_fe_sqrt now checks that the value it calculated is actually a square root.
- Add return values to secp256k1_fe_sqrt and secp256k1_ge_set_xo.
- Callers of secp256k1_ge_set_xo can use return value instead of explicit validity checks
- Add random value tests for secp256k1_fe_sqrt
This commit is contained in:
Peter Dettman
2014-05-21 10:22:14 +07:00
parent 78fb796997
commit 09ca4f32e2
6 changed files with 84 additions and 21 deletions
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6
src/group_impl.h
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@@ -77,17 +77,19 @@ void static secp256k1_gej_set_xy(secp256k1_gej_t *r, const secp256k1_fe_t *x, co
secp256k1_fe_set_int(&r->z, 1);
}
void static secp256k1_ge_set_xo(secp256k1_ge_t *r, const secp256k1_fe_t *x, int odd) {
int static secp256k1_ge_set_xo(secp256k1_ge_t *r, const secp256k1_fe_t *x, int odd) {
r->x = *x;
secp256k1_fe_t x2; secp256k1_fe_sqr(&x2, x);
secp256k1_fe_t x3; secp256k1_fe_mul(&x3, x, &x2);
r->infinity = 0;
secp256k1_fe_t c; secp256k1_fe_set_int(&c, 7);
secp256k1_fe_add(&c, &x3);
secp256k1_fe_sqrt(&r->y, &c);
if (!secp256k1_fe_sqrt(&r->y, &c))
return 0;
secp256k1_fe_normalize(&r->y);
if (secp256k1_fe_is_odd(&r->y) != odd)
secp256k1_fe_negate(&r->y, &r->y, 1);
return 1;
}
void static secp256k1_gej_set_ge(secp256k1_gej_t *r, const secp256k1_ge_t *a) {