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Creating interface for Blowfish code

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klun

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Code C - [expand]
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// blowfish.h     interface file for blowfish.cpp
// _THE BLOWFISH ENCRYPTION ALGORITHM_
// by Bruce Schneier
// Revised code--3/20/94
// Converted to C++ class 5/96, Jim Conger
 
#define MAXKEYBYTES     56      // 448 bits max
#define NPASS           16      // SBox passes
 
#define DWORD       unsigned long
#define WORD        unsigned short
#define BYTE        unsigned char
 
class CBlowFish
{
private:
    DWORD       * PArray ;
    DWORD       (* SBoxes)[256];
    void        Blowfish_encipher (DWORD *xl, DWORD *xr) ;
    void        Blowfish_decipher (DWORD *xl, DWORD *xr) ;
 
public:
            CBlowFish () ;
            ~CBlowFish () ;
    void        Initialize (BYTE key[], int keybytes) ;
    DWORD       GetOutputLength (DWORD lInputLong) ;
    DWORD       Encode (BYTE * pInput, BYTE * pOutput, DWORD lSize) ;
    void        Decode (BYTE * pInput, BYTE * pOutput, DWORD lSize) ;
 
} ;
 
// choose a byte order for your hardware
#define ORDER_DCBA  // chosing Intel in this case
 
#ifdef ORDER_DCBA   // DCBA - little endian - intel
    union aword {
      DWORD dword;
      BYTE byte [4];
      struct {
        unsigned int byte3:8;
        unsigned int byte2:8;
        unsigned int byte1:8;
        unsigned int byte0:8;
      } w;
    };
#endif
 
#ifdef ORDER_ABCD   // ABCD - big endian - motorola
    union aword {
      DWORD dword;
      BYTE byte [4];
      struct {
        unsigned int byte0:8;
        unsigned int byte1:8;
        unsigned int byte2:8;
        unsigned int byte3:8;
      } w;
    };
#endif
 
#ifdef ORDER_BADC   // BADC - vax
    union aword {
      DWORD dword;
      BYTE byte [4];
      struct {
        unsigned int byte1:8;
        unsigned int byte0:8;
        unsigned int byte3:8;
        unsigned int byte2:8;
      } w;
};
#endif
 
--------------------------------------------------------------------
 
// blowfish.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include "blowfish.h"
#include "blowfish.h2"  // holds the random digit tables
 
#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])
 
 
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 _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}



Can someone tell me how to create an interface for the Blowfish code above? I want to show the execution time for the whole encryption and decryption process that is completed.
 
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