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Add _fe_verify_magnitude (no-op unless VERIFY is enabled)

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Co-authored-by: Tim Ruffing <crypto@timruffing.de>
This commit is contained in:
Peter Dettman 2021-12-05 16:19:52 +07:00 committed by Sebastian Falbesoner
parent 690b0fc05a
commit 4e9661fc42
2 changed files with 10 additions and 0 deletions
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3
src/field.h
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@ -352,4 +352,7 @@ static int secp256k1_fe_is_square_var(const secp256k1_fe *a);
/** Check invariants on a field element (no-op unless VERIFY is enabled). */ /** Check invariants on a field element (no-op unless VERIFY is enabled). */
static void secp256k1_fe_verify(const secp256k1_fe *a); static void secp256k1_fe_verify(const secp256k1_fe *a);
/** Check that magnitude of a is at most m (no-op unless VERIFY is enabled). */
static void secp256k1_fe_verify_magnitude(const secp256k1_fe *a, int m);
#endif /* SECP256K1_FIELD_H */ #endif /* SECP256K1_FIELD_H */

7
src/field_impl.h
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@ -159,6 +159,7 @@ static int secp256k1_fe_sqrt(secp256k1_fe * SECP256K1_RESTRICT r, const secp256k
#ifndef VERIFY #ifndef VERIFY
static void secp256k1_fe_verify(const secp256k1_fe *a) { (void)a; } static void secp256k1_fe_verify(const secp256k1_fe *a) { (void)a; }
static void secp256k1_fe_verify_magnitude(const secp256k1_fe *a, int m) { (void)a; (void)m; }
#else #else
static void secp256k1_fe_impl_verify(const secp256k1_fe *a); static void secp256k1_fe_impl_verify(const secp256k1_fe *a);
static void secp256k1_fe_verify(const secp256k1_fe *a) { static void secp256k1_fe_verify(const secp256k1_fe *a) {
@ -172,6 +173,12 @@ static void secp256k1_fe_verify(const secp256k1_fe *a) {
secp256k1_fe_impl_verify(a); secp256k1_fe_impl_verify(a);
} }
static void secp256k1_fe_verify_magnitude(const secp256k1_fe *a, int m) {
VERIFY_CHECK(m >= 0);
VERIFY_CHECK(m <= 32);
VERIFY_CHECK(a->magnitude <= m);
}
static void secp256k1_fe_impl_normalize(secp256k1_fe *r); static void secp256k1_fe_impl_normalize(secp256k1_fe *r);
SECP256K1_INLINE static void secp256k1_fe_normalize(secp256k1_fe *r) { SECP256K1_INLINE static void secp256k1_fe_normalize(secp256k1_fe *r) {
secp256k1_fe_verify(r); secp256k1_fe_verify(r);