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Merge magnitude/normalized fields, move/improve comments

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Also split secp256k1_fe_verify into a generic and an implementation
specific part.
This commit is contained in:
Pieter Wuille
2022-01-28 17:39:30 -05:00
parent 341cc19726
commit b29566c51b
6 changed files with 96 additions and 61 deletions
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18
src/field_impl.h
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@@ -7,6 +7,7 @@
#ifndef SECP256K1_FIELD_IMPL_H
#define SECP256K1_FIELD_IMPL_H
#include "field.h"
#include "util.h"
#if defined(SECP256K1_WIDEMUL_INT128)
@@ -131,4 +132,21 @@ static int secp256k1_fe_sqrt(secp256k1_fe *r, const secp256k1_fe *a) {
return secp256k1_fe_equal(&t1, a);
}
#ifndef VERIFY
static void secp256k1_fe_verify(const secp256k1_fe *a) { (void)a; }
#else
static void secp256k1_fe_impl_verify(const secp256k1_fe *a);
static void secp256k1_fe_verify(const secp256k1_fe *a) {
/* Magnitude between 0 and 32. */
int r = (a->magnitude >= 0) & (a->magnitude <= 32);
/* Normalized is 0 or 1. */
r &= (a->normalized == 0) | (a->normalized == 1);
/* If normalized, magnitude must be 0 or 1. */
if (a->normalized) r &= (a->magnitude <= 1);
VERIFY_CHECK(r == 1);
/* Invoke implementation-specific checks. */
secp256k1_fe_impl_verify(a);
}
#endif /* defined(VERIFY) */
#endif /* SECP256K1_FIELD_IMPL_H */