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src/common/Cryptography/BigNumber.h

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+/*
+ * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _AUTH_BIGNUMBER_H
+#define _AUTH_BIGNUMBER_H
+
+#include "Define.h"
+#include <array>
+#include <string>
+#include <vector>
+
+struct bignum_st;
+
+class AC_COMMON_API BigNumber
+{
+public:
+    BigNumber();
+    BigNumber(BigNumber const& bn);
+    BigNumber(uint32 v) : BigNumber() { SetDword(v); }
+    BigNumber(int32 v) : BigNumber() { SetDword(v); }
+    BigNumber(std::string const& v) : BigNumber() { SetHexStr(v); }
+
+    template <std::size_t Size>
+    BigNumber(std::array<uint8, Size> const& v, bool littleEndian = true) : BigNumber() { SetBinary(v.data(), Size, littleEndian); }
+
+    ~BigNumber();
+
+    void SetDword(int32);
+    void SetDword(uint32);
+    void SetQword(uint64);
+    void SetBinary(uint8 const* bytes, int32 len, bool littleEndian = true);
+
+    template <typename Container>
+    auto SetBinary(Container const& c, bool littleEndian = true) -> std::enable_if_t<!std::is_pointer_v<std::decay_t<Container>>> { SetBinary(std::data(c), std::size(c), littleEndian); }
+
+    bool SetHexStr(char const* str);
+    bool SetHexStr(std::string const& str) { return SetHexStr(str.c_str()); }
+
+    void SetRand(int32 numbits);
+
+    BigNumber& operator=(BigNumber const& bn);
+
+    BigNumber& operator+=(BigNumber const& bn);
+    BigNumber operator+(BigNumber const& bn) const
+    {
+        BigNumber t(*this);
+        return t += bn;
+    }
+
+    BigNumber& operator-=(BigNumber const& bn);
+    BigNumber operator-(BigNumber const& bn) const
+    {
+        BigNumber t(*this);
+        return t -= bn;
+    }
+
+    BigNumber& operator*=(BigNumber const& bn);
+    BigNumber operator*(BigNumber const& bn) const
+    {
+        BigNumber t(*this);
+        return t *= bn;
+    }
+
+    BigNumber& operator/=(BigNumber const& bn);
+    BigNumber operator/(BigNumber const& bn) const
+    {
+        BigNumber t(*this);
+        return t /= bn;
+    }
+
+    BigNumber& operator%=(BigNumber const& bn);
+    BigNumber operator%(BigNumber const& bn) const
+    {
+        BigNumber t(*this);
+        return t %= bn;
+    }
+
+    BigNumber& operator<<=(int n);
+    BigNumber operator<<(int n) const
+    {
+        BigNumber t(*this);
+        return t <<= n;
+    }
+
+    [[nodiscard]] int CompareTo(BigNumber const& bn) const;
+    bool operator<=(BigNumber const& bn) const { return (CompareTo(bn) <= 0); }
+    bool operator==(BigNumber const& bn) const { return (CompareTo(bn) == 0); }
+    bool operator>=(BigNumber const& bn) const { return (CompareTo(bn) >= 0); }
+    bool operator<(BigNumber const& bn) const { return (CompareTo(bn) < 0); }
+    bool operator>(BigNumber const& bn) const { return (CompareTo(bn) > 0); }
+
+    [[nodiscard]] bool IsZero() const;
+    [[nodiscard]] bool IsNegative() const;
+
+    [[nodiscard]] BigNumber ModExp(BigNumber const& bn1, BigNumber const& bn2) const;
+    [[nodiscard]] BigNumber Exp(BigNumber const&) const;
+
+    [[nodiscard]] int32 GetNumBytes() const;
+
+    struct bignum_st* BN() { return _bn; }
+    [[nodiscard]] struct bignum_st const* BN() const { return _bn; }
+
+    [[nodiscard]] uint32 AsDword() const;
+
+    void GetBytes(uint8* buf, std::size_t bufsize, bool littleEndian = true) const;
+    [[nodiscard]] std::vector<uint8> ToByteVector(int32 minSize = 0, bool littleEndian = true) const;
+
+    template <std::size_t Size>
+    std::array<uint8, Size> ToByteArray(bool littleEndian = true) const
+    {
+        std::array<uint8, Size> buf;
+        GetBytes(buf.data(), Size, littleEndian);
+        return buf;
+    }
+
+    [[nodiscard]] std::string AsHexStr() const;
+    [[nodiscard]] std::string AsDecStr() const;
+
+private:
+    struct bignum_st* _bn;
+
+};
+#endif