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diff --git a/src/common/Cryptography/BigNumber.h b/src/common/Cryptography/BigNumber.h
new file mode 100644
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+++ b/src/common/Cryptography/BigNumber.h
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+/*
+ * Copyright (C) 2008-2015 TrinityCore <http://www.trinitycore.org/>
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ *
+ * 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 <memory>
+#include "Define.h"
+#include <string>
+
+struct bignum_st;
+
+class BigNumber
+{
+    public:
+        BigNumber();
+        BigNumber(BigNumber const& bn);
+        BigNumber(uint32);
+        ~BigNumber();
+
+        void SetDword(uint32);
+        void SetQword(uint64);
+        void SetBinary(uint8 const* bytes, int32 len);
+        void SetHexStr(char const* str);
+
+        void SetRand(int32 numbits);
+
+        BigNumber& operator=(BigNumber const& bn);
+
+        BigNumber operator+=(BigNumber const& bn);
+        BigNumber operator+(BigNumber const& bn)
+        {
+            BigNumber t(*this);
+            return t += bn;
+        }
+
+        BigNumber operator-=(BigNumber const& bn);
+        BigNumber operator-(BigNumber const& bn)
+        {
+            BigNumber t(*this);
+            return t -= bn;
+        }
+
+        BigNumber operator*=(BigNumber const& bn);
+        BigNumber operator*(BigNumber const& bn)
+        {
+            BigNumber t(*this);
+            return t *= bn;
+        }
+
+        BigNumber operator/=(BigNumber const& bn);
+        BigNumber operator/(BigNumber const& bn)
+        {
+            BigNumber t(*this);
+            return t /= bn;
+        }
+
+        BigNumber operator%=(BigNumber const& bn);
+        BigNumber operator%(BigNumber const& bn)
+        {
+            BigNumber t(*this);
+            return t %= bn;
+        }
+
+        bool IsZero() const;
+        bool IsNegative() const;
+
+        BigNumber ModExp(BigNumber const& bn1, BigNumber const& bn2);
+        BigNumber Exp(BigNumber const&);
+
+        int32 GetNumBytes(void);
+
+        struct bignum_st *BN() { return _bn; }
+
+        uint32 AsDword();
+
+        std::unique_ptr<uint8[]> AsByteArray(int32 minSize = 0, bool littleEndian = true);
+
+        std::string AsHexStr() const;
+        std::string AsDecStr() const;
+
+    private:
+        struct bignum_st *_bn;
+
+};
+#endif
+