New API for blinded ECC point multiplication

No shared state

1 files changed, 2 insertions, 3 deletions

diff --git a/src/lib/pubkey/eckcdsa/eckcdsa.cpp b/src/lib/pubkey/eckcdsa/eckcdsa.cpp
index 743d5ab95..be721a6b6 100644
--- a/src/lib/pubkey/eckcdsa/eckcdsa.cpp
+++ b/src/lib/pubkey/eckcdsa/eckcdsa.cpp
@@ -45,7 +45,6 @@ class ECKCDSA_Signature_Operation final : public PK_Ops::Signature_with_EMSA
                                 const std::string& emsa) :
          PK_Ops::Signature_with_EMSA(emsa),
          m_group(eckcdsa.domain()),
-         m_base_point(m_group.get_base_point(), m_group.get_order()),
          m_x(eckcdsa.private_value()),
          m_prefix()
          {
@@ -68,9 +67,9 @@ class ECKCDSA_Signature_Operation final : public PK_Ops::Signature_with_EMSA
 
    private:
       const EC_Group m_group;
-      Blinded_Point_Multiply m_base_point;
       const BigInt& m_x;
       secure_vector<uint8_t> m_prefix;
+      std::vector<BigInt> m_ws;
    };
 
 secure_vector<uint8_t>
@@ -78,7 +77,7 @@ ECKCDSA_Signature_Operation::raw_sign(const uint8_t msg[], size_t,
                                      RandomNumberGenerator& rng)
    {
    const BigInt k = BigInt::random_integer(rng, 1, m_group.get_order());
-   const PointGFp k_times_P = m_base_point.blinded_multiply(k, rng);
+   const PointGFp k_times_P = m_group.blinded_base_point_multiply(k, rng, m_ws);
    const BigInt k_times_P_x = k_times_P.get_affine_x();
 
    secure_vector<uint8_t> to_be_hashed(k_times_P_x.bytes());