diff options
Diffstat (limited to 'src/secp256k1/src/scalar_4x64_impl.h')
| -rw-r--r-- | src/secp256k1/src/scalar_4x64_impl.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/secp256k1/src/scalar_4x64_impl.h b/src/secp256k1/src/scalar_4x64_impl.h index d378335d99..8f539c4bc6 100644 --- a/src/secp256k1/src/scalar_4x64_impl.h +++ b/src/secp256k1/src/scalar_4x64_impl.h @@ -946,4 +946,15 @@ SECP256K1_INLINE static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r, secp256k1_scalar_cadd_bit(r, 0, (l[(shift - 1) >> 6] >> ((shift - 1) & 0x3f)) & 1); } +static SECP256K1_INLINE void secp256k1_scalar_cmov(secp256k1_scalar *r, const secp256k1_scalar *a, int flag) { + uint64_t mask0, mask1; + VG_CHECK_VERIFY(r->d, sizeof(r->d)); + mask0 = flag + ~((uint64_t)0); + mask1 = ~mask0; + r->d[0] = (r->d[0] & mask0) | (a->d[0] & mask1); + r->d[1] = (r->d[1] & mask0) | (a->d[1] & mask1); + r->d[2] = (r->d[2] & mask0) | (a->d[2] & mask1); + r->d[3] = (r->d[3] & mask0) | (a->d[3] & mask1); +} + #endif /* SECP256K1_SCALAR_REPR_IMPL_H */ |