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Address 'constant-time' TODOs in field impls

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This commit is contained in:
Peter Dettman
2014-11-04 12:41:42 +07:00
parent 112510dfab
commit 137e77afb4
2 changed files with 10 additions and 10 deletions
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8
src/field_5x52_impl.h
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@@ -109,13 +109,13 @@ void static inline secp256k1_fe_set_int(secp256k1_fe_t *r, int a) {
#endif
}
// TODO: not constant time!
int static inline secp256k1_fe_is_zero(const secp256k1_fe_t *a) {
#ifdef VERIFY
VERIFY_CHECK(a->normalized);
secp256k1_fe_verify(a);
#endif
return (a->n[0] == 0 && a->n[1] == 0 && a->n[2] == 0 && a->n[3] == 0 && a->n[4] == 0);
const uint64_t *t = a->n;
return (t[0] | t[1] | t[2] | t[3] | t[4]) == 0;
}
int static inline secp256k1_fe_is_odd(const secp256k1_fe_t *a) {
@@ -136,7 +136,6 @@ void static inline secp256k1_fe_clear(secp256k1_fe_t *a) {
}
}
// TODO: not constant time!
int static inline secp256k1_fe_equal(const secp256k1_fe_t *a, const secp256k1_fe_t *b) {
#ifdef VERIFY
VERIFY_CHECK(a->normalized);
@@ -144,7 +143,8 @@ int static inline secp256k1_fe_equal(const secp256k1_fe_t *a, const secp256k1_fe
secp256k1_fe_verify(a);
secp256k1_fe_verify(b);
#endif
return (a->n[0] == b->n[0] && a->n[1] == b->n[1] && a->n[2] == b->n[2] && a->n[3] == b->n[3] && a->n[4] == b->n[4]);
const uint64_t *t = a->n, *u = b->n;
return ((t[0]^u[0]) | (t[1]^u[1]) | (t[2]^u[2]) | (t[3]^u[3]) | (t[4]^u[4])) == 0;
}
void static secp256k1_fe_set_b32(secp256k1_fe_t *r, const unsigned char *a) {