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Abstract out verify logic for fe_set_b32

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This commit is contained in:
Pieter Wuille
2022-01-28 18:19:00 -05:00
parent ce4d2093e8
commit f7a7666aeb
4 changed files with 23 additions and 21 deletions
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11
src/field_10x26_impl.h
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@@ -298,8 +298,7 @@ static int secp256k1_fe_impl_cmp_var(const secp256k1_fe *a, const secp256k1_fe *
return 0;
}
static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned char *a) {
int ret;
static int secp256k1_fe_impl_set_b32(secp256k1_fe *r, const unsigned char *a) {
r->n[0] = (uint32_t)a[31] | ((uint32_t)a[30] << 8) | ((uint32_t)a[29] << 16) | ((uint32_t)(a[28] & 0x3) << 24);
r->n[1] = (uint32_t)((a[28] >> 2) & 0x3f) | ((uint32_t)a[27] << 6) | ((uint32_t)a[26] << 14) | ((uint32_t)(a[25] & 0xf) << 22);
r->n[2] = (uint32_t)((a[25] >> 4) & 0xf) | ((uint32_t)a[24] << 4) | ((uint32_t)a[23] << 12) | ((uint32_t)(a[22] & 0x3f) << 20);
@@ -311,13 +310,7 @@ static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned char *a) {
r->n[8] = (uint32_t)a[5] | ((uint32_t)a[4] << 8) | ((uint32_t)a[3] << 16) | ((uint32_t)(a[2] & 0x3) << 24);
r->n[9] = (uint32_t)((a[2] >> 2) & 0x3f) | ((uint32_t)a[1] << 6) | ((uint32_t)a[0] << 14);
ret = !((r->n[9] == 0x3FFFFFUL) & ((r->n[8] & r->n[7] & r->n[6] & r->n[5] & r->n[4] & r->n[3] & r->n[2]) == 0x3FFFFFFUL) & ((r->n[1] + 0x40UL + ((r->n[0] + 0x3D1UL) >> 26)) > 0x3FFFFFFUL));
#ifdef VERIFY
r->magnitude = 1;
r->normalized = ret;
secp256k1_fe_verify(r);
#endif
return ret;
return !((r->n[9] == 0x3FFFFFUL) & ((r->n[8] & r->n[7] & r->n[6] & r->n[5] & r->n[4] & r->n[3] & r->n[2]) == 0x3FFFFFFUL) & ((r->n[1] + 0x40UL + ((r->n[0] + 0x3D1UL) >> 26)) > 0x3FFFFFFUL));
}
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */