www.pudn.com > vod2007.rar > Des1.cpp
// DES1.cpp: implementation of the CDES class.
//
//////////////////////////////////////////////////////////////////////
//#include "stdafx.h"
#include "DES1.h"
#include
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
#define IP_TABLE 0
#define IP_1_TABLE 1
#define E_TABLE 2
#define P_TABLE 3
#define PC1_TABLE 4
#define PC2_TABLE 5
////////////////////////////////////////////////////////
// g_nOut: number of output bits from each table
int g_nOut[6] = {64,64,48,32,56,48};
////////////////////////////////////////////////////////
// TABLE_ip: INITIAL PERMUTATION
int TABLE_ip[64] = {
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6,
64,56,48,40,32,24,16,8,
57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7
} ;
////////////////////////////////////////////////////////
// TABLE_ip_1: INVERSE INITIAL PERMUTATION
int TABLE_ip_1[64] = {
40,8,48,16,56,24,64,32,
39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,
37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,
35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,
33,1,41,9,49,17,57,25
} ;
////////////////////////////////////////////////////////
// TABLE_e: Expansion Function
int TABLE_ePro[48] = {
32, 5, 1, 2, 3, 4,
4, 9, 5, 6, 7, 8,
8, 13, 9, 10, 11, 12,
12, 17, 13, 14, 15, 16,
16, 21, 17, 18, 19, 20,
20, 25, 21, 22, 23, 24,
24, 29, 25, 26, 27, 28,
28, 1, 29, 30, 31, 32
} ;
////////////////////////////////////////////////////////
// p: Permutation Function P
int TABLE_p[32] = {
16,7,20,21,
29,12,28,17,
1,15,23,26,
5,18,31,10,
2,8,24,14,
32,27,3,9,
19,13,30,6,
22,11,4,25
} ;
////////////////////////////////////////////////////////
// pc_1: Permuted Choice1
int TABLE_pc_1[56] = {
57,49,41,33,25,17,9,
1,58,50,42,34,26,18,
10,2,59,51,43,35,27,
19,11,3,60,52,44,36,
63,55,47,39,31,23,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4} ;
////////////////////////////////////////////////////////
// pc_2: Permuted Choice2
int TABLE_pc_2Pro[48] = {
14, 5, 17, 11, 24, 1,
3, 10, 28, 15, 6, 21,
23, 8, 19, 12, 4, 26,
16, 2, 7, 27, 20, 13,
41, 55, 52, 31, 37, 47,
30, 48, 40, 51, 45, 33,
44, 53, 49, 39, 56, 34,
46, 32, 42, 50, 36, 29
} ;
////////////////////////////////////////////////////////
// s: Selection Function (s1...s8)
BYTE TABLE_s[8][64] =
{
// S1
{
14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,
0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,
4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,
15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13
} ,
// S2
{
15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,
3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,
0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,
13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9
},
// S3
{
10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,
13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,
1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12
},
// S4
{
7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,
13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,
3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14
},
// S5
{
2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,
14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,
4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,
11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,
},
// S6
{
12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,
10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,
4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13
},
// S7
{
4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,
13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,
6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12
},
// S8
{
13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,
1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,
2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11
}
};
/*
TABLE_shift: Left SHifts of C and D blocks
*/
int TABLE_shift[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1} ;
void Encrypt(unsigned char *src, unsigned char *key, unsigned char *dst)
{
DesAlgo(src, key, dst, 1);
}
void Decrypt(unsigned char *src, unsigned char *key, unsigned char *dst)
{
DesAlgo(src, key, dst, 0);
}
void DesAlgo(unsigned char *src, unsigned char *key, unsigned char *dst, int bEncrypt)
{
unsigned char input[64]; /* store input data*/
unsigned char output[64]; /* store output data*/
unsigned char KEY[64]; /* store key*/
int i,i1,j;
unsigned char temp2[8];
unsigned char temp7[7];
unsigned char temp32[32];
unsigned char temp64[64];
unsigned char K[48]; /* store subkey --- K[n], n=1,2,...16*/
unsigned char fResult[32]; /* store result of fFunction(),*/
LRStruct LR; /* store L[i],R[i] --- temp data after every circle*/
CDStruct CD; /* store C[i],D[i] --- temp Result of Shift()*/
BitToByte(src, input, 8); /* src (64 bits) ==>input (64 unsigned chars)*/
SelectExchangeFromTable(IP_TABLE,input,(unsigned char*)&LR); /* INPUT ==> IP ==> L0,R0*/
BitToByte(key, KEY, 8); /* key (64 bits) ==>KEY (64 unsigned chars)*/
SelectExchangeFromTable(PC1_TABLE,KEY,(unsigned char*)&CD); /* KEY ==> PC_1 ==> C0,D0*/
for (i=0; i<16; i++)
{
/*unsigned char K[48];*/ /* store subkey --- K[n], n=1,2,...16*/
/*unsigned char fResult[32];*/ /* store result of fFunction(),*/
/* then store result of L[i].EOR.f[i].*/
/* get K(i+1) */
Shift(&CD, i, bEncrypt); /* C[i],D[i] ==> shifting ==> C[i+1],D[i+1]*/
{
/*unsigned char temp[7];*/
ByteToBit((unsigned char*)&CD,temp7,7);
}
SelectExchangeFromTable(PC2_TABLE,(unsigned char*)&CD, K); /* C[i+1],D[i+1] ==> PC_2 ==> K[i+1]*/
{
/*unsigned char temp[64];*/
for(i1=0; i1<8; i1++)
{
temp64[i1*8+0]=0;
temp64[i1*8+1]=0;
for (j=0; j<6; j++)
{
temp64[i1*8+(j+2)]=K[i1*6+j];
}
}
ByteToBit(temp64,temp2,8);
}
/* fResult[i] <== f( R[i], K[i+1] )*/
fFunction(LR.R, K, fResult);
/* fResult[i] <== L[i] .EOR. f[i]*/
EOR(LR.L, fResult, 32);
/* L(i+1) <== R[i]*/
memcpy(LR.L, LR.R, sizeof(unsigned char)*32);
/* R(i+1) <== fResult[i]*/
memcpy(LR.R, fResult, sizeof(unsigned char)*32);
}
/* LR <== RL*/
memcpy(temp32, LR.L,sizeof(unsigned char)*32);
memcpy(LR.L, LR.R,sizeof(unsigned char)*32);
memcpy(LR.R, temp32,sizeof(unsigned char)*32);
SelectExchangeFromTable(IP_1_TABLE, (unsigned char*)&LR, output); /* L16R16 ==> IP_1 ==> output*/
ByteToBit(output, dst, 8);/* dst (64 bits) <== output (64 unsigned chars)*/
}
void BitToByte(unsigned char *src, unsigned char *dst, int n)
{
int i;
unsigned char bs;
for (i=0; i 0)
dst[i*8+7] = 1;
else
dst[i*8+7] = 0;
bs = 0;
bs = 0x02 & src[i];
if(bs > 0)
dst[i*8+6] = 1;
else
dst[i*8+6] = 0;
bs = 0;
bs = 0x04 & src[i];
if(bs > 0)
dst[i*8+5] = 1;
else
dst[i*8+5] = 0;
bs = 0;
bs = 0x08 & src[i];
if(bs > 0)
dst[i*8+4] = 1;
else
dst[i*8+4] = 0;
bs = 0;
bs = 0x10 & src[i];
if(bs > 0)
dst[i*8+3] = 1;
else
dst[i*8+3] = 0;
bs = 0;
bs = 0x20 & src[i];
if(bs > 0)
dst[i*8+2] = 1;
else
dst[i*8+2] = 0;
bs = 0;
bs = 0x40 & src[i];
if(bs > 0)
dst[i*8+1] = 1;
else
dst[i*8+1] = 0;
bs = 0;
bs = 0x80 & src[i];
if(bs > 0)
dst[i*8+0] = 1;
else
dst[i*8+0] = 0;
}
}
void ByteToBit(unsigned char *src, unsigned char *dst, int n)
{
int i;
unsigned char bs;
for (i=0; i 0)
bs |= 0x01;
if(src[i*8+6] > 0)
bs |= 0x02;
if(src[i*8+5] > 0)
bs |= 0x04;
if(src[i*8+4] > 0)
bs |= 0x08;
if(src[i*8+3] > 0)
bs |= 0x10;
if(src[i*8+2] > 0)
bs |= 0x20;
if(src[i*8+1] > 0)
bs |= 0x40;
if(src[i*8+0] > 0)
bs |= 0x80;
dst[i] = bs;
/*
BS->b0 = src[i*8+7];
BS->b1 = src[i*8+6];
BS->b2 = src[i*8+5];
BS->b3 = src[i*8+4];
BS->b4 = src[i*8+3];
BS->b5 = src[i*8+2];
BS->b6 = src[i*8+1];
BS->b7 = src[i*8+0];
*/
}
}
/**/
void SelectExchangeFromTable(int nTable, unsigned char *src, unsigned char *dst)
{
static int * table[6] = {TABLE_ip, TABLE_ip_1, TABLE_ePro, TABLE_p, TABLE_pc_1, TABLE_pc_2Pro};
int nOut,i;
int *pTable;
nOut = g_nOut[nTable];
pTable = table[nTable];
for (i=0; i< nOut; i++)
{
dst[i] = src[pTable[i]-1];
}
}
void Shift(CDStruct * pCD, int iCircle, int bEncrypt)
{
if ( 0 == bEncrypt)
{
/* When decprypting, the shift direction is opposite to*/
/* encrypting , but the shift value is the same as*/
/* encprypting except the first time.*/
/* The first time Decprypting needn't shift.*/
if ( iCircle != 0)
{
RShift(pCD->C, TABLE_shift[iCircle]);
RShift(pCD->D, TABLE_shift[iCircle]);
}
}
else
{
LShift(pCD->C, TABLE_shift[iCircle]);
LShift(pCD->D, TABLE_shift[iCircle]);
}
}
/* 28 unsigned chars Right shift nShift time(s)*/
void RShift(unsigned char *buf28, int nShift)
{
int i;
unsigned char temp[2];
for (i=0; i=nShift; i--)
{
buf28[i] = buf28[i-nShift];
}
for (i=0; i E_TABLE ==> temp*/
SelectExchangeFromTable(E_TABLE, R, temp);
/* temp .EOR. K ==> temp*/
EOR(K, temp, 48);
/* temp ==> S_Change ==> SResult*/
S_Change(temp, SResult);
/* SResult ==> P_TABLE ==> result*/
SelectExchangeFromTable(P_TABLE, SResult, result);
}
/* dst <== src .EOR. dst*/
void EOR(unsigned char * src, unsigned char* dst, int n)
{
int i;
for (i=0; i S_Change ==> src*/
void S_Change(unsigned char* src, unsigned char* result)
{
unsigned char sTemp;
int i;
unsigned char nPos;
for (i=0; i<8; i++)
{
/*
BYTEStruct* rBSPos = (BYTEStruct*)nPos ;
*/
nPos = 0;
if(src[i*6+5] > 0)
nPos |= 0x01;
if(src[i*6+4] > 0)
nPos |= 0x02;
if(src[i*6+3] > 0)
nPos |= 0x04;
if(src[i*6+2] > 0)
nPos |= 0x08;
if(src[i*6+1] > 0)
nPos |= 0x10;
if(src[i*6+0] > 0)
nPos |= 0x20;
/*
rBSPos->b0 = src[i*6+5];
rBSPos->b1 = src[i*6+4];
rBSPos->b2 = src[i*6+3];
rBSPos->b3 = src[i*6+2];
rBSPos->b4 = src[i*6+1];
rBSPos->b5 = src[i*6+0];
*/
if (i%2==0)
{
/* S Table Result ==> High 4 bits of sTemp*/
sTemp= TABLE_s[i][nPos]*16;
}
else
{
/* S Table Result ==> Low 4 bits of sTemp*/
sTemp += TABLE_s[i][nPos];
/* sTemp Expand to 8 unsigned chars*/
BitToByte(&sTemp, &result[i/2*8], 1);
}
}
}