1 files changed, 1 insertions, 36 deletions
diff --git a/src/pubkey/ecdh/ecdh.cpp b/src/pubkey/ecdh/ecdh.cpp
index d3688fa5c..bf8a57b3b 100644
--- a/src/pubkey/ecdh/ecdh.cpp
+++ b/src/pubkey/ecdh/ecdh.cpp
@@ -19,7 +19,7 @@ ECDH_KA_Operation::ECDH_KA_Operation(const ECDH_PrivateKey& key) :
                   key.private_value();
    }
 
-SecureVector<byte> ECDH_KA_Operation::agree(const byte w[], u32bit w_len) const
+SecureVector<byte> ECDH_KA_Operation::agree(const byte w[], u32bit w_len)
    {
    PointGFp point = OS2ECP(w, w_len, curve);
 
@@ -30,39 +30,4 @@ SecureVector<byte> ECDH_KA_Operation::agree(const byte w[], u32bit w_len) const
                               curve.get_p().bytes());
    }
 
-/**
-* Derive a key
-*/
-SecureVector<byte> ECDH_PrivateKey::derive_key(const byte key[],
-                                               u32bit key_len) const
-   {
-   PointGFp point = OS2ECP(key, key_len, public_point().get_curve());
-   return derive_key(point);
-   }
-
-/**
-* Derive a key
-*/
-SecureVector<byte> ECDH_PrivateKey::derive_key(const ECDH_PublicKey& key) const
-   {
-   return derive_key(key.public_point());
-   }
-
-/**
-* Derive a key
-*/
-SecureVector<byte> ECDH_PrivateKey::derive_key(const PointGFp& point) const
-   {
-   const BigInt& cofactor = domain().get_cofactor();
-   const BigInt& n = domain().get_order();
-
-   BigInt l = inverse_mod(cofactor, n); // can precompute this
-
-   PointGFp S = (cofactor * point) * (private_value() * l);
-   S.check_invariants();
-
-   return BigInt::encode_1363(S.get_affine_x(),
-                              point.get_curve().get_p().bytes());
-   }
-
 }