generate GOST R 34.10 keys with param set

Signature.cpp

@@ -515,7 +515,21 @@ namespace crypto
 		
 			~GOSTR3410Curve ()
 			{
-				 EC_GROUP_free (m_Group);
+				EC_GROUP_free (m_Group);
+			}				
+
+			EC_POINT * MulP (const BIGNUM * n) const
+			{
+				BN_CTX * ctx = BN_CTX_new ();
+				auto p = EC_POINT_new (m_Group);
+				EC_POINT_mul (m_Group, p, n, nullptr, nullptr, ctx);
+				BN_CTX_free (ctx);
+				return p;
+			}
+
+			bool GetXY (const EC_POINT * p, BIGNUM * x, BIGNUM * y) const
+			{
+				return EC_POINT_get_affine_coordinates_GFp (m_Group, p, x, y, nullptr);
 			}
 			
 		private:
@@ -580,6 +594,20 @@ namespace crypto
 		return g_GOSTR3410Curves[paramSet]; 
 	}	
 
+	void CreateGOSTR3410RandomKeys (GOSTR3410ParamSet paramSet, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
+	{	
+		RAND_bytes (signingPrivateKey, GOSTR3410_PUBLIC_KEY_LENGTH/2);
+		BIGNUM * priv = BN_bin2bn (signingPrivateKey, GOSTR3410_PUBLIC_KEY_LENGTH/2, nullptr);
+		const auto& curve = GetGOSTR3410Curve (paramSet);
+		auto pub = curve->MulP (priv);
+		BN_free (priv);
+		BIGNUM * x = BN_new (), * y = BN_new ();
+		curve->GetXY (pub, x, y);
+		EC_POINT_free (pub);
+		bn2buf (x, signingPublicKey, GOSTR3410_PUBLIC_KEY_LENGTH/2);
+		bn2buf (y, signingPublicKey + GOSTR3410_PUBLIC_KEY_LENGTH/2, GOSTR3410_PUBLIC_KEY_LENGTH/2);
+		BN_free (x); BN_free (y); 
+	}
 }
 }
 

Signature.h

@@ -524,22 +524,10 @@ namespace crypto
 			EVP_PKEY * m_PrivateKey;
 	};	
 
+	void CreateGOSTR3410RandomKeys (GOSTR3410ParamSet paramSet, uint8_t * signingPrivateKey, uint8_t * signingPublicKey);
 	inline void CreateGOSTR3410RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
 	{
-		auto ctx = EVP_PKEY_CTX_new_id(NID_id_GostR3410_2001, nullptr);
+		CreateGOSTR3410RandomKeys (eGOSTR3410CryptoProA, signingPrivateKey, signingPublicKey); // A by default
-		EVP_PKEY_keygen_init (ctx);
-		EVP_PKEY_CTX_ctrl_str (ctx, "paramset", "A"); // TODO should be in one place
-		EVP_PKEY* pkey = nullptr;
-		EVP_PKEY_keygen (ctx, &pkey);
-		const EC_KEY* ecKey = (const EC_KEY*) EVP_PKEY_get0(pkey);
-		bn2buf (EC_KEY_get0_private_key (ecKey), signingPrivateKey, GOSTR3410_PUBLIC_KEY_LENGTH/2);
-		BIGNUM * x = BN_new(), * y = BN_new();
-		EC_POINT_get_affine_coordinates_GFp (EC_KEY_get0_group(ecKey), EC_KEY_get0_public_key (ecKey), x, y, NULL);
-		bn2buf (x, signingPublicKey, GOSTR3410_PUBLIC_KEY_LENGTH/2);
-		bn2buf (y, signingPublicKey + GOSTR3410_PUBLIC_KEY_LENGTH/2, GOSTR3410_PUBLIC_KEY_LENGTH/2);
-		BN_free (x); BN_free (y);
-		EVP_PKEY_CTX_free (ctx);
-		EVP_PKEY_free (pkey);	
 	}
 }
 }