📄 des.cpp
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#include "stdafx.h"
#include "des.h"
#include <string.h>
#include <stdio.h>
#include <memory.h>
#include <iostream.h>
static char c0[29] = {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};
static char d0[29] = {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};
static int ShiftCount[16] = {1,1,2,2,2,2,2,2,
1,2,2,2,2,2,2,1};
static int IPArr[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};
static int RIPArr[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};
static int BKExchgParm[48] = {14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
33, 40, 51, 45, 33, 48,
44, 49, 39, 50, 34, 53,
46, 42, 50, 36, 29, 32};
static int SelArr[48] = { 32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1};
static int EIPArr[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};
static int Si[8][64]={{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,
4, 11, 1, 14, 10, 0, 6, 13},
{15, 1, 8, 14, 6, 11, 3, 4,
9, 7, 1, 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},
{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},
{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},
{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, 7,
15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13,
6, 15, 0, 9, 10, 4, 5, 3},
{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},
{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},
{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, 0,
2, 1, 14, 7, 4, 10, 8, 13,
15, 12, 9, 0, 3, 5, 6, 11}};
static const char* binary(char* ptr)
{
static char buff[33];
char* lp = buff;
for(int i = 0;i < 4; i++) {
unsigned char ch = ptr[i];
unsigned char mask = (unsigned char)0x80;
for(int k = 0;k<8;k++) {
if( ch&mask )
*lp++= '1';
else
*lp++= '0';
mask>>=1;
}
}
*lp = 0;
return buff;
}
static void LShift(char* buff)
{
char c;
c = buff[0];
for(int i = 1;i<28;i++) {
buff[i-1] = buff[i];
}
buff[27] = c;
}
static void NLShift(char* buff,int count)
{
while(count--) LShift( buff );
}
//##ModelId=3E1A74B10276
void DESServer :: Encryption(long len,char * inPut,char * outPut)
{
char ibuff[9];
while(len>0) {
if(len<8)
memset(ibuff,' ',8);
int len1 = len>8 ? 8:len;
int i;
for( i = 0; i< len1;i++)
ibuff[i] = *inPut++;
Encryption(ibuff);
for( i = 0; i< 8;i++)
*outPut++ = ibuff[i];
len -=8;
}
}
//##ModelId=3E1A74B10294
void DESServer :: Decryption(long len,char * inPut,char * outPut)
{
int i;
char ibuff[9];
while(len>7) {
for( i = 0; i< 8;i++)
ibuff[i] = *inPut++;
Decryption(ibuff);
for( i = 0; i< 8;i++)
*outPut++ = ibuff[i];
len -=8;
}
}
//##ModelId=3E1A74B10316
void DESServer :: Encryption(char* iBlock)
{
if(Debug ) cout<<"\nIP INPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
IP(iBlock);
if(Debug )cout<<"IP OUTPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
for(int i = 0;i<1;i++) {
if(Debug )cout<<"ITERATION "<<i+1<<"\n";
if(Debug )cout<<"L="<<binary(iBlock)<<"\n";
if(Debug )cout<<"R="<<binary(&iBlock[4])<<"\n";
Transfer(iBlock,&iBlock[4],SubKey[i]);
if(Debug )cout<<"L="<<binary(iBlock)<<"\n";
if(Debug )cout<<"R="<<binary(&iBlock[4])<<"\n\n";
}
if(Debug )cout<<"RIP INPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
RIP(iBlock);
if(Debug )cout<<"RIP OUTPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
}
//##ModelId=3E1A74B102B2
void DESServer :: Decryption(char* iBlock)
{
if(Debug )cout<<"\nIP INPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
IP(iBlock);
if(Debug )cout<<"IP OUTPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
for(int i = 0;i>=0;i--) {
if(Debug )cout<<"ITERATION "<<i+1<<"\n";
if(Debug )cout<<"L="<<binary(iBlock)<<"\n";
if(Debug )cout<<"R="<<binary(&iBlock[4])<<"\n";
Transfer2(iBlock,&iBlock[4],SubKey[i]);
if(Debug )cout<<"L="<<binary(iBlock)<<"\n";
if(Debug )cout<<"R="<<binary(&iBlock[4])<<"\n\n";
}
if(Debug )cout<<"RIP INPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
RIP(iBlock);
if(Debug )cout<<"RIP OUTPUT:"<<binary(iBlock)<<binary(&iBlock[4])<<"\n";
}
//##ModelId=3E1A74B102EF
void DESServer :: IP(char* buff)
{
char buff1[9];
memcpy(buff1,buff,8);
for(int i = 0;i<8;i++)
EBuildChar(buff[i],buff1,&IPArr[8*i]);
}
//##ModelId=3E1A74B10302
void DESServer :: RIP(char* buff)
{
char buff1[9];
memcpy(buff1,buff,8);
for(int i = 0;i<8;i++)
EBuildChar(buff[i],buff1,&RIPArr[8*i]);
}
//##ModelId=3E1A74B1032A
void DESServer :: Transfer(char* l,char* r,char* key)
{
char rr[5];
char buff[7];
memcpy(rr,r,4);
E32To48(rr,buff);
int i;
for(i = 0;i<6;i++)
buff[i] ^= key[i];
E48To32(buff,rr);
memcpy(buff,rr,4);
for(i = 0;i<4;i++)
EBuildChar(rr[i],buff,&EIPArr[i*8]);
for(i = 0;i<4;i++)
rr[i] ^= l[i];
memcpy(l,r,4);
memcpy(r,rr,4);
}
//##ModelId=3E1A74B10348
void DESServer :: Transfer2(char* l,char* r,char* key)
{
char ll[5];
char buff[7];
memcpy(ll,l,4);
E32To48(ll,buff);
int i;
for(i = 0;i<6;i++)
buff[i] ^= key[i];
E48To32(buff,ll);
memcpy(buff,ll,4);
for(i = 0;i<4;i++)
EBuildChar(ll[i],buff,&EIPArr[i*8]);
for(i = 0;i<4;i++)
ll[i] ^= r[i];
memcpy(r,l,4);
memcpy(l,ll,4);
}
//##ModelId=3E1A74B10366
void DESServer :: E32To48(char* s,char* d)
{
for(int i = 0;i<6;i++)
EBuildChar(d[i],s,&SelArr[8*i]);
}
//##ModelId=3E1A74B1037A
void DESServer :: E48To32(char* s,char* d)
{
int m,n;
for(int i = 0; i< 4; i++) {
m = SGetRow(s,i*2);
n = SGetColumn(s,i*2);
d[i] = Si[i*2][m*16+n] << 4;
m = SGetRow(s,i*2 + 1);
n = SGetColumn(s,i*2 + 1);
d[i] |= Si[i*2+1][m*16+n];
}
}
//##ModelId=3E1A74B1038F
int DESServer :: SGetRow(char* s,int no)
{
int m1,n1,m2,n2;
m1 = no*6;
n1 = m1/8;
m1 %= 8;
m2 = no*6+5;
n2 = m2/8;
m2 %= 8;
int ret = 0;
if(s[n1] & (0x80>>m1))
ret +=2;
if(s[n2] & (0x80>>m2))
ret +=1;
return ret;
}
//##ModelId=3E1A74B103AC
int DESServer :: SGetColumn(char* s,int no)
{
int m,n,i,ret;
ret = 0;
for(i = 0;i< 4;i++) {
m = no*6+i+1;
n = m/8;
m %= 8;
if( s[n] & (0x80>>m) )
ret |= 0x01<<(3-i);
}
return ret;
}
//##ModelId=3E1A74B103C1
void DESServer :: EBuildChar(char & ch,char* s,int *pos)
{
ch = 0;
unsigned char mask;
int m,n;
for(int i = 0;i<8;i++) {
m = pos[i]-1;
n = m/8;
m = m%8;
mask = 0x80>>m;
if(s[n] & mask) {
mask = 0x80>>i;
ch |= mask;
}
}
}
//##ModelId=3E1A74B10257
DESServer :: DESServer(char * key)
{
memset(Key,' ',8);
if(key)
SetKey(key);
else
SetKey(" ");
Debug = 0;
}
//##ModelId=3E1A74B1026B
void DESServer :: SetKey(char* key)
{
int i = strlen(key);
memcpy(Key,key,i>8 ? 8:i);
SetSubKeys();
}
//##ModelId=3E1A74B20032
void DESServer :: SetSubKeys()
{
char cn[29],dn[29];
memcpy(cn,c0,28);
memcpy(dn,d0,28);
for(int i = 0;i<16;i++) {
NLShift(cn,ShiftCount[i]);
NLShift(dn,ShiftCount[i]);
for(int j= 0;j<6;j++)
BuildChar(SubKey[i][j],cn,dn,&BKExchgParm[j*8]);
}
}
//##ModelId=3E1A74B2000B
void DESServer :: BuildChar(char & ch,char* cn,char* dn,int *pos)
{
ch = 0;
unsigned char mask;
int m,n;
for(int i = 0;i<8;i++) {
if(pos[i]<= 28)
m = cn[pos[i]-1];
else
m = dn[pos[i]-29];
n = m/8;
m %= 8;
mask = 0x80>>m;
if(Key[n] & mask) {
mask = 0x80>>i;
ch |= mask;
}
}
}
//##ModelId=3E1A71A80318
CHexString::CHexString(const unsigned char* pStr, int len)
{
if (len <= 0) {
m_pData = NULL;
return;
}
unsigned char* p = m_pData = new unsigned char[len*2+1];
for (int i = 0; i < len; i++) {
unsigned char c = *pStr++;
unsigned char c1[2];
c1[0] = (c & 0xf0)>>4;
c1[1] = c&0x0f;
for (int j = 0; j < 2; j++) {
if (c1[j] >= 10)
*p++ = 'A' + (c1[j] - 10);
else
*p++ = '0' + c1[j];
}
}
*p = 0;
}
CHexString::~CHexString()
{
if (m_pData)
delete[] m_pData;
}
BOOL CHexString::HexToASCII(int iSrcLen, LPCTSTR pSrc, unsigned char* pDes)
{
for (int i = 0; i < iSrcLen; i+=2) {
unsigned char c[2];
for (int j = 0; j < 2; j++) {
c[j] = *pSrc++;
if (!((c[j] >= '0' && c[j] <='9') || (c[j] >= 'A' && c[j] <='F')))
return FALSE;
if (c[j] >= 'A')
c[j] = c[j] - 'A' + 10;
else
c[j] -= '0';
}
*pDes++ = c[0]*16 + c[1];
}
return TRUE;
}
CString DESServer::EncryptString(CString str)
{
CString sPass;
sPass=str;
sPass.TrimRight();
int iLen = (sPass.GetLength()+7)/8*8;
unsigned char* pBuff = new unsigned char[iLen+1];
Encryption(sPass.GetLength(), (char*)(LPCTSTR)sPass, (char*)pBuff);
CHexString h(pBuff, iLen);
sPass = (LPCTSTR)h;
delete[] pBuff;
return sPass;
}
CString DESServer::DecryptString(CString str)
{
unsigned char pBuff[100];
unsigned char pPass[100];
if (CHexString::HexToASCII(str.GetLength(), (LPCSTR)str, pBuff)) {
Decryption(str.GetLength()/2, (char*)pBuff, (char*)pPass);
pPass[str.GetLength()/2] = 0;
CString sPass;
sPass = (LPCTSTR)pPass;
sPass.TrimRight();
return sPass;
} else
return "";
}
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