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Add group.h ge/gej equality functions

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This commit is contained in:
Pieter Wuille
2023-12-01 10:25:57 -05:00
parent 10e6d29b60
commit a47cd97d51
3 changed files with 38 additions and 20 deletions
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23
src/testutil.h
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@@ -7,6 +7,7 @@
#define SECP256K1_TESTUTIL_H
#include "field.h"
#include "group.h"
#include "testrand.h"
#include "util.h"
@@ -27,29 +28,11 @@ static void random_fe_non_zero(secp256k1_fe *nz) {
}
static void ge_equals_ge(const secp256k1_ge *a, const secp256k1_ge *b) {
CHECK(a->infinity == b->infinity);
if (a->infinity) {
return;
}
CHECK(secp256k1_fe_equal(&a->x, &b->x));
CHECK(secp256k1_fe_equal(&a->y, &b->y));
CHECK(secp256k1_ge_eq_var(a, b));
}
static void ge_equals_gej(const secp256k1_ge *a, const secp256k1_gej *b) {
secp256k1_fe z2s;
secp256k1_fe u1, u2, s1, s2;
CHECK(a->infinity == b->infinity);
if (a->infinity) {
return;
}
/* Check a.x * b.z^2 == b.x && a.y * b.z^3 == b.y, to avoid inverses. */
secp256k1_fe_sqr(&z2s, &b->z);
secp256k1_fe_mul(&u1, &a->x, &z2s);
u2 = b->x;
secp256k1_fe_mul(&s1, &a->y, &z2s); secp256k1_fe_mul(&s1, &s1, &b->z);
s2 = b->y;
CHECK(secp256k1_fe_equal(&u1, &u2));
CHECK(secp256k1_fe_equal(&s1, &s2));
CHECK(secp256k1_gej_eq_ge_var(b, a));
}
#endif /* SECP256K1_TESTUTIL_H */