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Add functions to test if X coordinate is valid

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This commit is contained in:
Pieter Wuille
2022-11-04 16:17:56 -04:00
parent a597a5a9ce
commit 79e5b2a8b8
3 changed files with 63 additions and 1 deletions
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6
src/group.h
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@@ -51,6 +51,12 @@ static void secp256k1_ge_set_xy(secp256k1_ge *r, const secp256k1_fe *x, const se
* for Y. Return value indicates whether the result is valid. */
static int secp256k1_ge_set_xo_var(secp256k1_ge *r, const secp256k1_fe *x, int odd);
/** Determine whether x is a valid X coordinate on the curve. */
static int secp256k1_ge_x_on_curve_var(const secp256k1_fe *x);
/** Determine whether fraction xn/xd is a valid X coordinate on the curve (xd != 0). */
static int secp256k1_ge_x_frac_on_curve_var(const secp256k1_fe *xn, const secp256k1_fe *xd);
/** Check whether a group element is the point at infinity. */
static int secp256k1_ge_is_infinity(const secp256k1_ge *a);