初步修复
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Cussrro
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Common/NetworkLib/CryptPacket.cpp
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Common/NetworkLib/CryptPacket.cpp
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#include "stdafx.h"
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#include "CryptPacket.h"
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#include <MMSystem.h>
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#ifdef _DEBUG
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#define new new(_NORMAL_BLOCK,__FILE__,__LINE__)
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#endif
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static unsigned char _table[2][8] = {
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6, 2, 7, 0, 1, 3, 5, 4,
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3, 4, 1, 5, 7, 6, 0, 2,
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} ;
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static unsigned char _mix_bytes[13] = {
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0x3f, 0x26, 0x42, 0xfd, 0x8a, 0x72, 0x34, 0x74, 0xc8, 0xbf, 0xcd, 0xa4, 0x94,
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} ;
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inline unsigned char EncodeGamePacketSize(unsigned char codes)
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{
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// CCCb bAAA
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// AAAC CCbb
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return (_table[0][codes&7] << 5) | ((codes>>3)&3) | (_table[0][(codes>>5)&7] << 2);
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}
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inline unsigned char DecodeGamePacketSize(unsigned char codes)
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{
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// AAAC CCbb
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// CCCb bAAA
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return _table[1][(codes>>5)&7] | (_table[1][(codes>>2)&7] << 5) | ((codes&3)<<3);
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}
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CCryptoPacket::CCryptoPacket()
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{
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}
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int CCryptoPacket::EncodeGamePacket(void *p, int main_header, int sub_header, const void *message, int size, BYTE cSeq)
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{
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int i, total;
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unsigned char magickey, encoded_main_header, encoded_sub_header;
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DNGAME_PACKET * packet = (DNGAME_PACKET*) p;
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encoded_main_header = EncodeGamePacketSize(main_header);
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encoded_sub_header = EncodeGamePacketSize(sub_header);
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packet->seq = EncodeGamePacketSize(cSeq);
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packet->datasize = size;
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packet->header = magickey = (unsigned char)encoded_main_header ^ _mix_bytes[size%sizeof(_mix_bytes)];
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packet->sub_header = (unsigned char)encoded_sub_header ^ _mix_bytes[size%sizeof(_mix_bytes)];
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for(i=0, total=0; i<size; i++)
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packet->data[i] = ((char*)message)[i] ^ _mix_bytes[(magickey+i+7)%sizeof(_mix_bytes)];
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packet->checksum = DNGAME_PACKET_HEADERSIZE + size;
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return DNGAME_PACKET_HEADERSIZE + size;
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}
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bool CCryptoPacket::DecodeGamePacket(DNGAME_PACKET *p)
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{
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unsigned short size;
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unsigned char magickey, header, sub_header, seq;
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int i, total;
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size = p->datasize;
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seq = p->seq;
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magickey = p->header;
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header = magickey ^ _mix_bytes[size%sizeof(_mix_bytes)];
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sub_header = p->sub_header ^ _mix_bytes[size%sizeof(_mix_bytes)];
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p->header = DecodeGamePacketSize(header);
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p->sub_header = DecodeGamePacketSize(sub_header);
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p->seq = DecodeGamePacketSize(seq);
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for(i=0, total=0; i<size; i++)
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p->data[i] ^= _mix_bytes[(magickey+i+7)%sizeof(_mix_bytes)];
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return size + DNGAME_PACKET_HEADERSIZE == p->checksum ? true : false;
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}
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int CCryptoPacket::CalcGamePacketSize(void *p, int len)
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{
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if( len >= DNGAME_PACKET_HEADERSIZE )
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return static_cast<DNGAME_PACKET*>(p)->datasize + DNGAME_PACKET_HEADERSIZE;
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return sizeof(DNGAME_PACKET);
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////
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const static char * s_pSzSample1 = { "I'm riding around, This cheaters town, Every place I go, Just bringin' me down I don't know when, I don't know if, \
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I'm ever comin' home I got my broken heart, Torn all in two, Cause every place I look, I picture him and you I dont know when, \
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I dont know if, I'm ever comin home Yeah baby you lied to me, you lied to me You stood there you smiled you opened your heart and you lied I dont know when, \
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I dont know if, I'm ever comin home, Never comin' home I'm drivin' slow, Don't know where I'm goin', I thought you loved me too, But I was always alone \
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I don't know when, I don't know if, I'm ever comin home, Comin' home I got a broken heart, Torn all in two, Cause everything I had, \
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I gave it all to you I don't know when, I don't know if, I'm ever comin' home, Comin' home, Comin' home Oh baby you lied to me, you lied to me \
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You opened up your little black heart you smiled and you lied I don't know when, I don't know if, I'm ever comin' home, Oh I don't know when, I don't know if, \
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I'm ever comin' home, Oh I don't know when, I don't know if, I'm ever comin' home, Comin' home " };
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const static char * s_pSzSample2 = { "Down a dirt road in southern Louisiana Flew a white Continental with the top laid back Pretty blonde sittin' on a seat of red leather \
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Dust blowin' outta those well wore tracks She goin' back Moss hangin' down like beards in the bayou Old folks watchin' from a rockin' chair\
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Ain't no place for a girl of her state She's gonna ruin her reputation She don't care cause he's waitin' there She's gonna say Tell me you think that I'm pretty\
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Tell me you think that I'm smart Tell me anything and I'll believe it'Cause I'm listening with my heart Maybe it's wrong but that's the way it goes\
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When the only love you get is down Cheater's road Bedsprings rubbin' her back through the blanket Sweat like a tear rollin' down her neck\
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Watchin' him pullin' down the shades on the window She'd rather have him than an empty bed and her self respect And she says\
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Tell me you think that I'm pretty Tell me you think that I'm smart Tell me anything and I'll believe it'Cause I'm listening with my heart\
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Maybe it's wrong but that's the way it goes When the only love you get is down Cheater's road Old man countin' his money in the city\
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Nothin' but the bottom dollar on his mind The whole situation is a downright pity He didn't even notice when she crossed that line\
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When she crossed that line And she said Tell me you think that I'm pretty Tell me you think that I'm smart Tell me anything and I'll believe \
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it'Cause I'm listening with my heart Maybe it's wrong but that's the way it goes When the only love you get is down Cheater's road\
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Down cheater's road Oh tell me you think that I'm pretty Tell me you think that I'm smart Oh tell me you think that I'm pretty\
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Tell me you think that I'm smart Oh tell me you think that I'm pretty Tell me you think that I'm smart" };
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CCryptoKey::CCryptoKey()
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{
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m_Random.srand(timeGetTime());
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m_bMakeKey = false;
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}
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bool CCryptoKey::ServerMakeKey(char * pKey, bool bCheck)
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{
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if (m_bMakeKey && bCheck) return false;
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bool bRet = MakeCryptoKey(pKey);
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m_bMakeKey = true;
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return bRet;
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}
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int CCryptoKey::ServerVerifyKey(char * pKey)
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{
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if (m_bMakeKey == false) return -1; //never maked serverkey
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int nRet = VerifyCryptoKey(pKey, true);
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m_bMakeKey = false;
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return nRet;
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}
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bool CCryptoKey::ClientVerifyKey(char * pKey)
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{
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if (VerifyCryptoKey(pKey, false) == 0)
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return MakeCryptoKey(pKey + 9);
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return false;
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}
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bool CCryptoKey::MakeCryptoKey(char * pBuf)
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{
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if (pBuf == NULL) return false;
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int nCnt = 0;
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BYTE cSampleKey = m_Random.rand(UCHAR_MAX);
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const char * pSampleKey = cSampleKey%2 == 0 ? s_pSzSample1 : s_pSzSample2;
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pBuf[nCnt++] = EncodeGamePacketSize(cSampleKey);
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USHORT nSampleKeyLen = (USHORT)strlen(pSampleKey);
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short nKey[2];
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for (int i = 0; i < sizeof(nKey)/sizeof(*nKey); i++)
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{
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nKey[i] = m_Random.rand(nSampleKeyLen - 2);
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pBuf[nCnt++] = EncodeGamePacketSize(((unsigned char*)&nKey[i])[0]);
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pBuf[nCnt++] = EncodeGamePacketSize(((unsigned char*)&nKey[i])[1]);
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}
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for (int i = 0; i < sizeof(nKey)/sizeof(*nKey); i++)
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{
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pBuf[nCnt++] = EncodeGamePacketSize(pSampleKey[nKey[i]]);
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pBuf[nCnt++] = EncodeGamePacketSize(pSampleKey[nKey[i]+1]);
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}
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return true;
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}
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int CCryptoKey::VerifyCryptoKey(char * pBuf, bool bFullLenth)
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{
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if (pBuf == NULL) return -3; //generic error
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int nCnt = 0;
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int nLenth = bFullLenth == true ? 2 : 1;
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for (int j = 0; j < nLenth; j++)
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{
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BYTE cSampleKey = DecodeGamePacketSize(pBuf[nCnt++]);
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const char * pSampleKey = cSampleKey%2 == 0 ? s_pSzSample1 : s_pSzSample2;
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USHORT nSampleKeyLen = (USHORT)strlen(pSampleKey);
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short nKey[2];
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for (int i = 0; i < sizeof(nKey)/sizeof(*nKey); i++)
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{
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((unsigned char*)&nKey[i])[0] = DecodeGamePacketSize(pBuf[nCnt++]);
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((unsigned char*)&nKey[i])[1] = DecodeGamePacketSize(pBuf[nCnt++]);
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}
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for (int i = 0; i < sizeof(nKey)/sizeof(*nKey); i++)
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{
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for (int h = 0; h < 2; h++)
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if (pSampleKey[nKey[i] + h] != DecodeGamePacketSize(pBuf[nCnt++]))
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return -2; //diff key
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}
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}
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return 0;
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}
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