diff options
Diffstat (limited to 'src/lib/pubkey/ecgdsa/ecgdsa.cpp')
| -rw-r--r-- | src/lib/pubkey/ecgdsa/ecgdsa.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/lib/pubkey/ecgdsa/ecgdsa.cpp b/src/lib/pubkey/ecgdsa/ecgdsa.cpp index 6cbd3453b..db790b0d1 100644 --- a/src/lib/pubkey/ecgdsa/ecgdsa.cpp +++ b/src/lib/pubkey/ecgdsa/ecgdsa.cpp @@ -61,9 +61,12 @@ ECGDSA_Signature_Operation::raw_sign(const uint8_t msg[], size_t msg_len, BigInt k = BigInt::random_integer(rng, 1, m_group.get_order()); - const PointGFp k_times_P = m_group.blinded_base_point_multiply(k, rng, m_ws); - const BigInt r = m_group.mod_order(k_times_P.get_affine_x()); - const BigInt s = m_group.multiply_mod_order(m_x, mul_sub(k, r, m)); + const BigInt r = m_group.mod_order( + m_group.blinded_base_point_multiply_x(k, rng, m_ws)); + + const BigInt kr = m_group.multiply_mod_order(k, r); + + const BigInt s = m_group.multiply_mod_order(m_x, kr - m); // With overwhelming probability, a bug rather than actual zero r/s if(r.is_zero() || s.is_zero()) |