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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
*/
#include <ace/Guard_T.h>
#include "Cryptography/BigNumber.h"
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <algorithm>
#include <ace/Auto_Ptr.h>
BigNumber::BigNumber()
: _bn(BN_new())
{ }
BigNumber::BigNumber(BigNumber const& bn)
: _bn(BN_dup(bn._bn))
{ }
BigNumber::BigNumber(uint32 val)
: _bn(BN_new())
{
BN_set_word(_bn, val);
}
BigNumber::~BigNumber()
{
BN_free(_bn);
}
void BigNumber::SetDword(uint32 val)
{
BN_set_word(_bn, val);
}
void BigNumber::SetQword(uint64 val)
{
BN_set_word(_bn, (uint32)(val >> 32));
BN_lshift(_bn, _bn, 32);
BN_add_word(_bn, (uint32)(val & 0xFFFFFFFF));
}
void BigNumber::SetBinary(uint8 const* bytes, int32 len)
{
uint8* array = new uint8[len];
for (int i = 0; i < len; i++)
array[i] = bytes[len - 1 - i];
BN_bin2bn(array, len, _bn);
delete[] array;
}
void BigNumber::SetHexStr(char const* str)
{
BN_hex2bn(&_bn, str);
}
void BigNumber::SetRand(int32 numbits)
{
BN_rand(_bn, numbits, 0, 1);
}
BigNumber& BigNumber::operator=(BigNumber const& bn)
{
if (this == &bn)
return *this;
BN_copy(_bn, bn._bn);
return *this;
}
BigNumber BigNumber::operator+=(BigNumber const& bn)
{
BN_add(_bn, _bn, bn._bn);
return *this;
}
BigNumber BigNumber::operator-=(BigNumber const& bn)
{
BN_sub(_bn, _bn, bn._bn);
return *this;
}
BigNumber BigNumber::operator*=(BigNumber const& bn)
{
BN_CTX *bnctx;
bnctx = BN_CTX_new();
BN_mul(_bn, _bn, bn._bn, bnctx);
BN_CTX_free(bnctx);
return *this;
}
BigNumber BigNumber::operator/=(BigNumber const& bn)
{
BN_CTX *bnctx;
bnctx = BN_CTX_new();
BN_div(_bn, NULL, _bn, bn._bn, bnctx);
BN_CTX_free(bnctx);
return *this;
}
BigNumber BigNumber::operator%=(BigNumber const& bn)
{
BN_CTX *bnctx;
bnctx = BN_CTX_new();
BN_mod(_bn, _bn, bn._bn, bnctx);
BN_CTX_free(bnctx);
return *this;
}
BigNumber BigNumber::Exp(BigNumber const& bn)
{
BigNumber ret;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
BN_exp(ret._bn, _bn, bn._bn, bnctx);
BN_CTX_free(bnctx);
return ret;
}
BigNumber BigNumber::ModExp(BigNumber const& bn1, BigNumber const& bn2)
{
BigNumber ret;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
BN_mod_exp(ret._bn, _bn, bn1._bn, bn2._bn, bnctx);
BN_CTX_free(bnctx);
return ret;
}
int32 BigNumber::GetNumBytes(void)
{
return BN_num_bytes(_bn);
}
uint32 BigNumber::AsDword()
{
return (uint32)BN_get_word(_bn);
}
bool BigNumber::isZero() const
{
return BN_is_zero(_bn);
}
ACE_Auto_Array_Ptr<uint8> BigNumber::AsByteArray(int32 minSize, bool littleEndian)
{
int length = (minSize >= GetNumBytes()) ? minSize : GetNumBytes();
uint8* array = new uint8[length];
// If we need more bytes than length of BigNumber set the rest to 0
if (length > GetNumBytes())
memset((void*)array, 0, length);
BN_bn2bin(_bn, (unsigned char *)array);
// openssl's BN stores data internally in big endian format, reverse if little endian desired
if (littleEndian)
std::reverse(array, array + length);
ACE_Auto_Array_Ptr<uint8> ret(array);
return ret;
}
char * BigNumber::AsHexStr() const
{
return BN_bn2hex(_bn);
}
char * BigNumber::AsDecStr() const
{
return BN_bn2dec(_bn);
}
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