frost/secp256k1-zkp
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Add fe_half tests for worst-case inputs

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- Add field method _fe_get_bounds
This commit is contained in:
Peter Dettman
2021-12-23 16:41:10 +07:00
parent 4eb8b932ff
commit d64bb5d4f3
4 changed files with 89 additions and 0 deletions
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15
src/field_5x52_impl.h
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@@ -58,6 +58,21 @@ static void secp256k1_fe_verify(const secp256k1_fe *a) {
}
#endif
static void secp256k1_fe_get_bounds(secp256k1_fe *r, int m) {
VERIFY_CHECK(m >= 0);
VERIFY_CHECK(m <= 2048);
r->n[0] = 0xFFFFFFFFFFFFFULL * 2 * m;
r->n[1] = 0xFFFFFFFFFFFFFULL * 2 * m;
r->n[2] = 0xFFFFFFFFFFFFFULL * 2 * m;
r->n[3] = 0xFFFFFFFFFFFFFULL * 2 * m;
r->n[4] = 0x0FFFFFFFFFFFFULL * 2 * m;
#ifdef VERIFY
r->magnitude = m;
r->normalized = (m == 0);
secp256k1_fe_verify(r);
#endif
}
static void secp256k1_fe_normalize(secp256k1_fe *r) {
uint64_t t0 = r->n[0], t1 = r->n[1], t2 = r->n[2], t3 = r->n[3], t4 = r->n[4];