decrypt

void __stdcall decrypt(char* Buf, unsigned int BufLen, char* Key)
{
  BYTE keyLen, tmpByte;
  unsigned int i, j;
  BYTE codeTable[256];


  keyLen = strlen(Key);

  if ( keyLen > 0 )
  {
    for (i = 0 ; i < 256 ; i++)
    {
        codeTable[i] = i;
    }
    BYTE loc = 0, loc1 = 0;
    for ( i = 0; i < 256; ++i )
    {
      loc = (BYTE)loc + codeTable[i] + *(BYTE *)(Key + i % keyLen);
      tmpByte = codeTable[loc];
      codeTable[loc] = codeTable[i];
      codeTable[i] = tmpByte;
    }
    loc = 0;
    loc1 = 0;
    for ( j = 0; BufLen > j; ++j )
    {
      loc += 1;
      loc1 = loc1 + codeTable[loc];
      tmpByte = codeTable[loc1];
      codeTable[loc1] = codeTable[loc];
      codeTable[loc] = tmpByte;
      tmpByte = codeTable[loc1] + tmpByte;
      Buf[j] ^= codeTable[tmpByte];
    }
  }
}