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Abstract out verify logic for fe_inv{,_var}

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This commit is contained in:
Pieter Wuille
2022-01-28 19:20:51 -05:00
parent 3167646072
commit d5aa2f0358
4 changed files with 43 additions and 51 deletions
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28
src/field_10x26_impl.h
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@@ -1197,12 +1197,6 @@ static void secp256k1_fe_from_signed30(secp256k1_fe *r, const secp256k1_modinv32
r->n[7] = (a6 >> 2 ) & M26;
r->n[8] = (a6 >> 28 | a7 << 2) & M26;
r->n[9] = (a7 >> 24 | a8 << 6);
#ifdef VERIFY
r->magnitude = 1;
r->normalized = 1;
secp256k1_fe_verify(r);
#endif
}
static void secp256k1_fe_to_signed30(secp256k1_modinv32_signed30 *r, const secp256k1_fe *a) {
@@ -1210,10 +1204,6 @@ static void secp256k1_fe_to_signed30(secp256k1_modinv32_signed30 *r, const secp2
const uint64_t a0 = a->n[0], a1 = a->n[1], a2 = a->n[2], a3 = a->n[3], a4 = a->n[4],
a5 = a->n[5], a6 = a->n[6], a7 = a->n[7], a8 = a->n[8], a9 = a->n[9];
#ifdef VERIFY
VERIFY_CHECK(a->normalized);
#endif
r->v[0] = (a0 | a1 << 26) & M30;
r->v[1] = (a1 >> 4 | a2 << 22) & M30;
r->v[2] = (a2 >> 8 | a3 << 18) & M30;
@@ -1231,34 +1221,24 @@ static const secp256k1_modinv32_modinfo secp256k1_const_modinfo_fe = {
0x2DDACACFL
};
static void secp256k1_fe_inv(secp256k1_fe *r, const secp256k1_fe *x) {
secp256k1_fe tmp;
static void secp256k1_fe_impl_inv(secp256k1_fe *r, const secp256k1_fe *x) {
secp256k1_fe tmp = *x;
secp256k1_modinv32_signed30 s;
tmp = *x;
secp256k1_fe_normalize(&tmp);
secp256k1_fe_to_signed30(&s, &tmp);
secp256k1_modinv32(&s, &secp256k1_const_modinfo_fe);
secp256k1_fe_from_signed30(r, &s);
#ifdef VERIFY
VERIFY_CHECK(secp256k1_fe_normalizes_to_zero(r) == secp256k1_fe_normalizes_to_zero(&tmp));
#endif
}
static void secp256k1_fe_inv_var(secp256k1_fe *r, const secp256k1_fe *x) {
secp256k1_fe tmp;
static void secp256k1_fe_impl_inv_var(secp256k1_fe *r, const secp256k1_fe *x) {
secp256k1_fe tmp = *x;
secp256k1_modinv32_signed30 s;
tmp = *x;
secp256k1_fe_normalize_var(&tmp);
secp256k1_fe_to_signed30(&s, &tmp);
secp256k1_modinv32_var(&s, &secp256k1_const_modinfo_fe);
secp256k1_fe_from_signed30(r, &s);
#ifdef VERIFY
VERIFY_CHECK(secp256k1_fe_normalizes_to_zero(r) == secp256k1_fe_normalizes_to_zero(&tmp));
#endif
}
static int secp256k1_fe_is_square_var(const secp256k1_fe *x) {