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field: Static-assert that int args affecting magnitude are constant

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See #1001.
This commit is contained in:
Tim Ruffing
2023-06-13 13:34:49 +02:00
parent 67214f5f7d
commit be8ff3a02a
6 changed files with 43 additions and 18 deletions
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12
src/field_impl.h
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@@ -289,23 +289,23 @@ SECP256K1_INLINE static void secp256k1_fe_get_b32(unsigned char *r, const secp25
secp256k1_fe_impl_get_b32(r, a);
}
static void secp256k1_fe_impl_negate(secp256k1_fe *r, const secp256k1_fe *a, int m);
SECP256K1_INLINE static void secp256k1_fe_negate(secp256k1_fe *r, const secp256k1_fe *a, int m) {
static void secp256k1_fe_impl_negate_unchecked(secp256k1_fe *r, const secp256k1_fe *a, int m);
SECP256K1_INLINE static void secp256k1_fe_negate_unchecked(secp256k1_fe *r, const secp256k1_fe *a, int m) {
secp256k1_fe_verify(a);
VERIFY_CHECK(m >= 0 && m <= 31);
VERIFY_CHECK(a->magnitude <= m);
secp256k1_fe_impl_negate(r, a, m);
secp256k1_fe_impl_negate_unchecked(r, a, m);
r->magnitude = m + 1;
r->normalized = 0;
secp256k1_fe_verify(r);
}
static void secp256k1_fe_impl_mul_int(secp256k1_fe *r, int a);
SECP256K1_INLINE static void secp256k1_fe_mul_int(secp256k1_fe *r, int a) {
static void secp256k1_fe_impl_mul_int_unchecked(secp256k1_fe *r, int a);
SECP256K1_INLINE static void secp256k1_fe_mul_int_unchecked(secp256k1_fe *r, int a) {
secp256k1_fe_verify(r);
VERIFY_CHECK(a >= 0 && a <= 32);
VERIFY_CHECK(a*r->magnitude <= 32);
secp256k1_fe_impl_mul_int(r, a);
secp256k1_fe_impl_mul_int_unchecked(r, a);
r->magnitude *= a;
r->normalized = 0;
secp256k1_fe_verify(r);