RC5解密/加密的命令与征服游戏客户端

Question

RC5.h

#ifndef RC5_H 
#define RC5_H 

#define RC5_32   32 

#define RC5_12   12 
#define RC5_SUB   (RC5_12*2 + 2) 

#define RC5_16   16 
#define RC5_KEY   (RC5_16/4) 

const unsigned long RC5_PW32 = 0xB7E15163; 
const unsigned long RC5_QW32 = 0x61C88647; 

const unsigned char RC5PASSWORD_KEY[16] = { 0x3C, 0xDC, 0xFE, 0xE8, 0xC4, 0x54, 0xD6, 0x7E, 
              0x16, 0xA6, 0xF8, 0x1A, 0xE8, 0xD0, 0x38, 0xBE }; 
const unsigned char RC5BARPASSWORD_KEY[16] = { 0x44, 0xD0, 0xE2, 0xBA, 0x4A, 0x38, 0x14, 0x44, 
               0x64, 0xE0, 0x12, 0xAE, 0xDA, 0x56, 0x1C, 0xF8 }; 

//////////////////////////////////////////////////////////////////////////////////////////////// 

class CRc5 
{ 
public: 
    void Rc5InitKey(const unsigned char bufKey[RC5_16]); 
    void Rc5Encrypt(void* buf, int nLen8); 
    void Rc5Decrypt(void* buf, int nLen8); 

protected: 
    unsigned long m_bufKey[RC5_KEY]; 
    unsigned long m_bufSub[RC5_SUB]; 
}; 

#endif // RC5_H 

RC5.cpp

#include <string> 
#include <assert.h> 

#include "RC5.h" 


unsigned long rotate_left(unsigned long nData, unsigned long nCount); 
unsigned long rotate_right(unsigned long nData, unsigned long nCount); 

void CRc5::Rc5InitKey(const unsigned char bufKey[RC5_16]) 
{ 
    try{ 
     memcpy(m_bufKey, bufKey, RC5_16); 
    }catch(...) { 
#ifdef _DEBUG 
     assert(!"InitRc5Key()"); 
#endif 
    } 
    /*for (int i = 0; i < 4; i++) 
    m_bufKey[i] = (long)(bufKey[i * 4] + (bufKey[i * 4 + 1] << 8) + (bufKey[i * 4 + 2] << 16) + (bufKey[i * 4 + 3] << 24)); 
    m_bufSub[0] = RC5_PW32;*/ 
    m_bufSub[0] = RC5_PW32; 
    for(int i = 1; i<26; i++) 
    { 
     m_bufSub[i] = m_bufSub[i-1] - RC5_QW32; 
    } 
    int    i, j; 
    unsigned long x, y; 
    i = j = x = y = 0; 
    for(int k = 0; k <=78; k++) 
    { 
     m_bufSub[i] = rotate_left((m_bufSub[i] + x + y), 3); 
     x = m_bufSub[i]; 
     i = (i + 1) % 0x1A; 
     m_bufKey[j] = rotate_left((m_bufKey[j] + x + y), (x + y)); 
     y = m_bufKey[j]; 
     j = (j + 1) % 4; 
    } 
} 


void CRc5::Rc5Encrypt(void* buf, int nLen8) 
{ 
    assert(nLen8 % 8 == 0); 
    nLen8 = (nLen8/8) * 8; 
    if(nLen8 <= 0) 
     return; 

    unsigned long* bufData = (unsigned long*)buf; 
    for(int k = 0; k < nLen8/8; k++) 
    { 
     unsigned long a = bufData[2*k]; 
     unsigned long b = bufData[2*k + 1]; 

     unsigned long le = a + m_bufSub[0]; 
     unsigned long re = b + m_bufSub[1]; 
     for(int i = 1; i <= 12; i++) 
     { 
      le = rotate_left((le^re), re) + m_bufSub[2*i]; 
      re = rotate_left((re^le), le) + m_bufSub[2*i + 1]; 
     } 

     bufData[2*k]  = le; 
     bufData[2*k + 1] = re; 
    } 
} 

//////////////////////////////////////////////////////////////////////////////////////////////// 
void CRc5::Rc5Decrypt(void* buf, int nLen8) 
{ 
    assert(nLen8 % 8 == 0); 
    nLen8 = (nLen8/8) * 8; 
    if(nLen8 <= 0) 
     return; 

    unsigned long* bufData = (unsigned long*)buf; 
    for(int k = 0; k < nLen8/8; k++) 
    { 
     unsigned long ld = bufData[2*k]; 
     unsigned long rd = bufData[2*k + 1]; 
     for(int i = 12; i >= 1; i--) 
     { 
      rd = rotate_right((rd - m_bufSub[2*i + 1]), ld)^ld; 
      ld = rotate_right((ld - m_bufSub[2*i]), rd)^rd; 
     } 

     unsigned long b = rd - m_bufSub[1]; 
     unsigned long a = ld - m_bufSub[0]; 

     bufData[2*k]  = a; 
     bufData[2*k + 1] = b; 
    } 
} 



unsigned long rotate_left(unsigned long nData, unsigned long nCount) 
{ 
    return (nData << (nCount & 0x1F) | nData >> 0x20 - (nCount & 0x1F)); 
} 

//////////////////////////////////////////////////////////////////////////////////////////////// 
unsigned long rotate_right(unsigned long nData, unsigned long nCount) 
{ 
    return (nData << (nCount & 0x1F) | nData >> 0x20 - (nCount & 0x1F)); 
} 

的main.cpp

//all the stuff 
char buf[4000]; 
      char acc[16]; 
      char psw[16]; 
      recv(sConnect,buf,sizeof(buf),0); 
      //dec.Rc5InitKey(RC5PASSWORD_KEY); 
      dec.Rc5Decrypt(buf,16); 
      cout << buf; 

为什么我张贴在这里，我不能解密我从客户那里得到的buf（但我们不玩这个游戏！）是的，我知道但是我确定我在代码里面做错了，所以也许有人在处理RC5 kn如果不是这样，它会做错什么。 thnx

Answer 1

没有仔细查看你的代码，我想你需要设置密钥计划，然后才能实际解密你收到的缓冲区。