frost/secp256k1-zkp
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Weak normalization for secp256k1_fe_equal

Browse Source
This commit is contained in:
Pieter Wuille
2014-12-10 14:52:18 +01:00
parent 0295f0a33d
commit d7174edf5f
6 changed files with 28 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/field_impl.h
View File

@@ -64,6 +64,14 @@ static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
return secp256k1_fe_set_b32(r, tmp);
}
SECP256K1_INLINE static int secp256k1_fe_equal_var(const secp256k1_fe_t *a, const secp256k1_fe_t *b) {
secp256k1_fe_t na;
secp256k1_fe_negate(&na, a, 1);
secp256k1_fe_add(&na, b);
secp256k1_fe_normalize_var(&na);
return secp256k1_fe_is_zero(&na);
}
static int secp256k1_fe_sqrt_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
/** The binary representation of (p + 1)/4 has 3 blocks of 1s, with lengths in