#include "stdafx.hpp"
#include "blowfish.h"
#include "../GameNETv2.h"
#define S(x,i) (SBoxes[i][x.w.byte##i])
#define bf_F(x) (((S(x,0) + S(x,1)) ^ S(x,2)) + S(x,3))
#define ROUND(a,b,n) (a.dword ^= bf_F(b) ^ PArray[n])
namespace NetworkingEngine
{
#include "blowfish.h2" // holds the random digit tables
CBlowFish::CBlowFish ()
{
PArray = new DWORD [18] ;
SBoxes = new DWORD [4][256] ;
}
CBlowFish::~CBlowFish ()
{
delete PArray ;
delete [] SBoxes ;
}
// the low level (private) encryption function
void CBlowFish::Blowfish_encipher (DWORD *xl, DWORD *xr)
{
union aword Xl, Xr ;
Xl.dword = *xl ;
Xr.dword = *xr ;
Xl.dword ^= PArray [0];
ROUND (Xr, Xl, 1) ; ROUND (Xl, Xr, 2) ;
ROUND (Xr, Xl, 3) ; ROUND (Xl, Xr, 4) ;
ROUND (Xr, Xl, 5) ; ROUND (Xl, Xr, 6) ;
ROUND (Xr, Xl, 7) ; ROUND (Xl, Xr, 8) ;
ROUND (Xr, Xl, 9) ; ROUND (Xl, Xr, 10) ;
ROUND (Xr, Xl, 11) ; ROUND (Xl, Xr, 12) ;
ROUND (Xr, Xl, 13) ; ROUND (Xl, Xr, 14) ;
ROUND (Xr, Xl, 15) ; ROUND (Xl, Xr, 16) ;
Xr.dword ^= PArray [17] ;
*xr = Xl.dword ;
*xl = Xr.dword ;
}
// the low level (private) decryption function
void CBlowFish::Blowfish_decipher (DWORD *xl, DWORD *xr)
{
union aword Xl ;
union aword Xr ;
Xl.dword = *xl ;
Xr.dword = *xr ;
Xl.dword ^= PArray [17] ;
ROUND (Xr, Xl, 16) ; ROUND (Xl, Xr, 15) ;
ROUND (Xr, Xl, 14) ; ROUND (Xl, Xr, 13) ;
ROUND (Xr, Xl, 12) ; ROUND (Xl, Xr, 11) ;
ROUND (Xr, Xl, 10) ; ROUND (Xl, Xr, 9) ;
ROUND (Xr, Xl, 8) ; ROUND (Xl, Xr, 7) ;
ROUND (Xr, Xl, 6) ; ROUND (Xl, Xr, 5) ;
ROUND (Xr, Xl, 4) ; ROUND (Xl, Xr, 3) ;
ROUND (Xr, Xl, 2) ; ROUND (Xl, Xr, 1) ;
Xr.dword ^= PArray[0];
*xl = Xr.dword;
*xr = Xl.dword;
}
// constructs the enctryption sieve
void CBlowFish::Initialize (BYTE key[], int keybytes)
{
int i, j ;
DWORD data, datal, datar ;
union aword temp ;
// first fill arrays from data tables
for (i = 0 ; i < 18 ; i++)
PArray [i] = bf_P [i] ;
for (i = 0 ; i < 4 ; i++)
{
for (j = 0 ; j < 256 ; j++)
SBoxes [i][j] = bf_S [i][j] ;
}
j = 0 ;
for (i = 0 ; i < NPASS + 2 ; ++i)
{
temp.dword = 0 ;
temp.w.byte0 = key[j];
temp.w.byte1 = key[(j+1) % keybytes] ;
temp.w.byte2 = key[(j+2) % keybytes] ;
temp.w.byte3 = key[(j+3) % keybytes] ;
data = temp.dword ;
PArray [i] ^= data ;
j = (j + 4) % keybytes ;
}
datal = 0 ;
datar = 0 ;
for (i = 0 ; i < NPASS + 2 ; i += 2)
{
Blowfish_encipher (&datal, &datar) ;
PArray [i] = datal ;
PArray [i + 1] = datar ;
}
for (i = 0 ; i < 4 ; ++i)
{
for (j = 0 ; j < 256 ; j += 2)
{
Blowfish_encipher (&datal, &datar) ;
SBoxes [i][j] = datal ;
SBoxes [i][j + 1] = datar ;
}
}
}
// get output length, which must be even MOD 8
DWORD CBlowFish::GetOutputLength (DWORD lInputLong)
{
DWORD lVal ;
lVal = lInputLong % 8 ; // find out if uneven number of bytes at the end
if (lVal != 0)
return lInputLong + 8 - lVal ;
else
return lInputLong ;
}
// Encode pIntput into pOutput. Input length in lSize. Returned value
// is length of output which will be even MOD 8 bytes. Input buffer and
// output buffer can be the same, but be sure buffer length is even MOD 8.
DWORD CBlowFish::Encode (BYTE * pInput, BYTE * pOutput, DWORD lSize)
{
DWORD lCount, lOutSize, lGoodBytes ;
BYTE *pi, *po ;
int i, j ;
int SameDest = (pInput == pOutput ? 1 : 0) ;
lOutSize = GetOutputLength (lSize) ;
for (lCount = 0 ; lCount < lOutSize ; lCount += 8)
{
if (SameDest) // if encoded data is being written into input buffer
{
if (lCount < lSize - 7) // if not dealing with uneven bytes at end
{
Blowfish_encipher ((DWORD *) pInput,
(DWORD *) (pInput + 4)) ;
}
else // pad end of data with null bytes to complete encryption
{
po = pInput + lSize ; // point at byte past the end of actual data
j = (int) (lOutSize - lSize) ; // number of bytes to set to null
for (i = 0 ; i < j ; i++)
*po++ = 0 ;
Blowfish_encipher ((DWORD *) pInput,
(DWORD *) (pInput + 4)) ;
}
pInput += 8 ;
}
else // output buffer not equal to input buffer, so must copy
{ // input to output buffer prior to encrypting
if (lCount < lSize - 7) // if not dealing with uneven bytes at end
{
pi = pInput ;
po = pOutput ;
for (i = 0 ; i < 8 ; i++)
// copy bytes to output
*po++ = *pi++ ;
Blowfish_encipher ((DWORD *) pOutput, // now encrypt them
(DWORD *) (pOutput + 4)) ;
}
else // pad end of data with null bytes to complete encryption
{
lGoodBytes = lSize - lCount ; // number of remaining data bytes
po = pOutput ;
for (i = 0 ; i < (int) lGoodBytes ; i++)
*po++ = *pInput++ ;
for (j = i ; j < 8 ; j++)
*po++ = 0 ;
Blowfish_encipher ((DWORD *) pOutput,
(DWORD *) (pOutput + 4)) ;
}
pInput += 8 ;
pOutput += 8 ;
}
}
return lOutSize ;
}
// Decode pIntput into pOutput. Input length in lSize. Input buffer and
// output buffer can be the same, but be sure buffer length is even MOD 8.
void CBlowFish::Decode (BYTE * pInput, BYTE * pOutput, DWORD lSize)
{
DWORD lCount ;
BYTE *pi, *po ;
int i ;
int SameDest = (pInput == pOutput ? 1 : 0) ;
for (lCount = 0 ; lCount < lSize ; lCount += 8)
{
if (SameDest) // if encoded data is being written into input buffer
{
Blowfish_decipher ((DWORD *) pInput,
(DWORD *) (pInput + 4)) ;
pInput += 8 ;
}
else // output buffer not equal to input buffer
{ // so copy input to output before decoding
pi = pInput ;
po = pOutput ;
for (i = 0 ; i < 8 ; i++)
*po++ = *pi++ ;
Blowfish_decipher ((DWORD *) pOutput,
(DWORD *) (pOutput + 4)) ;
pInput += 8 ;
pOutput += 8 ;
}
}
}
int CBlowFish::rand_range(int min, int max)
{
return min+int(((max-min)+1)*rand()/(RAND_MAX + 1.0));
}
char * CBlowFish::CreateBFK()
{
srand((unsigned)(time(NULL))%rand());
char * key = new char[BLOWFISH_KEYLENGTH]; // maximum BF key length
key[BLOWFISH_KEYLENGTH-1] = 0;
for(int i=0;i<BLOWFISH_KEYLENGTH-1;i++)
key[i] = char(rand_range(1,255));
return key;
}
}
I read ALL your private messages.
"I don't want the salami." -WDF
WDF: I told her that she could come over if she brought beer.
Sirus: Wait, you made the recovering alcoholic bring beer?
WDF: This shouldn't surprise you, this is me we're talking about... It'll be a test.