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Ec.h

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+// This file is a part of RCKangaroo software
+// (c) 2024, RetiredCoder (RC)
+// License: GPLv3, see "LICENSE.TXT" file
+// https://github.com/RetiredC/Kang-2
+
+
+#pragma once
+
+#include "defs.h"
+#include "utils.h"
+
+class EcInt
+{
+public:
+	EcInt();
+
+	void Assign(EcInt& val);
+	void Set(u64 val);
+	void SetZero();
+	bool SetHexStr(const char* str);
+	void GetHexStr(char* str);
+	u16 GetU16(int index);
+
+	bool Add(EcInt& val); //returns true if carry
+	bool Sub(EcInt& val); //returns true if carry
+	void Neg();
+	void Neg256();
+	void ShiftRight(int nbits);
+	void ShiftLeft(int nbits);
+	bool IsLessThanU(EcInt& val);
+	bool IsLessThanI(EcInt& val);
+	bool IsEqual(EcInt& val);
+	bool IsZero();
+
+	void Mul_u64(EcInt& val, u64 multiplier);
+	void Mul_i64(EcInt& val, i64 multiplier);
+
+	void AddModP(EcInt& val);
+	void SubModP(EcInt& val);
+	void NegModP();
+	void NegModN();
+	void MulModP(EcInt& val);
+	void InvModP();
+	void SqrtModP();
+
+	void RndBits(int nbits);
+	void RndMax(EcInt& max);
+
+	u64 data[4 + 1];
+};
+
+class EcPoint
+{
+public:
+	bool IsEqual(EcPoint& pnt);
+	void LoadFromBuffer64(u8* buffer);
+	void SaveToBuffer64(u8* buffer);
+	bool SetHexStr(const char* str);
+	EcInt x;
+	EcInt y;
+};
+
+class Ec
+{
+public:
+	static EcPoint AddPoints(EcPoint& pnt1, EcPoint& pnt2);
+	static EcPoint DoublePoint(EcPoint& pnt);
+	static EcPoint MultiplyG(EcInt& k);
+#ifdef DEBUG_MODE
+	static EcPoint MultiplyG_Fast(EcInt& k);
+#endif
+	static EcInt CalcY(EcInt& x, bool is_even);
+	static bool IsValidPoint(EcPoint& pnt);
+};
+
+void InitEc();
+void DeInitEc();
+void SetRndSeed(u64 seed);