?? mydes.cpp
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// MyDes.cpp : implementation file
//
#include "stdafx.h"
#include "DES.h"
#include "MyDes.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// MyDes
IMPLEMENT_DYNCREATE(CMyDes, CCmdTarget)
CMyDes::CMyDes()
{
}
CMyDes::~CMyDes()
{
}
BEGIN_MESSAGE_MAP(CMyDes, CCmdTarget)
//{{AFX_MSG_MAP(MyDes)
// NOTE - the ClassWizard will add and remove mapping macros here.
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// MyDes message handlers
CString CMyDes::DecryStrHex(CString StrHex,CString Key)
{
CString Str,Temp;
int I,StrHexLen;
StrHexLen = strlen(StrHex);
Str.Empty();
for (I=0;I<(StrHexLen / 2);I++)
{
Temp.Empty();
Temp = Temp +StrHex[(I * 2)];
Temp = Temp +StrHex[(I * 2+1)];
Str = Str + (char)(HexToByte(Temp));
}
return DecryStr(Str, Key);
}
CString CMyDes::DecryStr(CString Str, CString Key)
{
BYTE KeyByte[8],StrByte[8],OutByte[8];
CString StrResult;
int J,I;
//不足八個字符的密碼補齊
while (strlen(Key)<8) {
Key = Key + ' ';
};
for (J=0;J<8;J++)
KeyByte[J] = Key[J];
makeKey(KeyByte,subKey);
for (I = 0; I<(int)(strlen(Str))/8;I++)
{
for (J=0;J<8;J++)
StrByte[J] = Str[I * 8 + J];
desData(dmDecry, StrByte, OutByte);
for (J=0;J<8;J++)
StrResult = StrResult + (char)OutByte[J];
}
return StrResult;
}
void CMyDes::makeKey(BYTE inkey[], KEYBYTE outkey[])
{
//左移次數的規定
const BYTE bitDisplace[16] = { 1,1,2,2, 2,2,2,2, 1,2,2,2, 2,2,2,1 };
BYTE outData56[7],outkey56[7];
BYTE key28l[4],key28r[4];
int j,i;
permutationChoose1(inkey,outData56);
key28l[0] = outData56[0] >> 4;
key28l[1] = (outData56[0] << 4) | (outData56[1] >> 4);
key28l[2] = (outData56[1] << 4) | (outData56[2] >> 4);
key28l[3] = (outData56[2] << 4) | (outData56[3] >> 4);
key28r[0] = outData56[3] & 0x0f;
key28r[1] = outData56[4];
key28r[2] = outData56[5];
key28r[3] = outData56[6];
//16輪迭代產成16個子密碼
for (j = 0 ;j<16; j++)
{
i = j;
cycleMove(key28l, bitDisplace[i]);
cycleMove(key28r, bitDisplace[i]);
outkey56[0] = (key28l[0] << 4) | (key28l[1] >> 4);
outkey56[1] = (key28l[1] << 4) | (key28l[2] >> 4);
outkey56[2] = (key28l[2] << 4) | (key28l[3] >> 4);
outkey56[3] = (key28l[3] << 4) | (key28r[0]);
outkey56[4] = key28r[1];
outkey56[5] = key28r[2];
outkey56[6] = key28r[3];
permutationChoose2(outkey56, outkey[i]);
};
}
void CMyDes::permutationChoose1(BYTE inData[], BYTE outData[])
{
int i;
for (i = 0 ; i<7; i++)
outData[i] = 0;
for (i = 0 ; i<56; i++)
{
if ((inData[BitPMC1[i] >> 3] & (1 << (7-(BitPMC1[i] & 7)))) !=0)
outData[i >> 3] = outData[i >> 3] | (1 << (7-(i & 7)));
}
}
void CMyDes::permutationChoose2(BYTE inData[], BYTE outData[])
{
int i;
for (i = 0 ; i<6; i++) outData[i] = 0;
for (i = 0 ; i<48; i++)
{
if ((inData[BitPMC2[i] >> 3] & (1 << (7-(BitPMC2[i] & 7)))) !=0)
outData[i >> 3] = outData[i >> 3] | (1 << (7-(i & 7)));
}
}
void CMyDes::cycleMove(BYTE inData[], BYTE bitMove)
{
for (int i = 0; i<bitMove;i++)
{
inData[0] = (inData[0] << 1) | (inData[1] >> 7);
inData[1] = (inData[1] << 1) | (inData[2] >> 7);
inData[2] = (inData[2] << 1) | (inData[3] >> 7);
inData[3] = (inData[3] << 1) | ((inData[0] & 0x10) >> 4);
inData[0] = (inData[0] & 0x0f);
};
}
void CMyDes::initPermutation(BYTE inData[])
{
BYTE newData[8];
int i;
for ( i = 0 ; i<8 ;i++ ) newData[i] = 0;
for (i = 0; i<64; i++)
if ((inData[BitIP[i] >> 3] & (1 << (7- (BitIP[i] & 0x07)))) != 0)
newData[i >> 3] = newData[i >> 3] | (1 << (7-(i & 0x07)));
for ( i = 0 ; i<8 ;i++ ) inData[i] = newData[i];
}
void CMyDes::encry(BYTE inData[], BYTE subKey[], BYTE outData[])
{
BYTE outBuf[6],buf[8];
int i;
expand(inData, outBuf);
for (i = 0;i<6;i++) outBuf[i] = outBuf[i] ^ subKey[i];
buf[0] = outBuf[0] >> 2;
buf[1] = ((outBuf[0] & 0x03) << 4) | (outBuf[1] >> 4);
buf[2] = ((outBuf[1] & 0x0f) << 2) | (outBuf[2] >> 6);
buf[3] = outBuf[2] & 0x3f;
buf[4] = outBuf[3] >> 2;
buf[5] = ((outBuf[3] & 0x03) << 4) | (outBuf[4] >> 4);
buf[6] = ((outBuf[4] & 0x0f) << 2) | (outBuf[5] >> 6);
buf[7] = outBuf[5] & 0x3f;
for (i = 0;i<8;i++) buf[i] = si(i, buf[i]);
for (i = 0;i<4;i++) outBuf[i] = (buf[i*2] << 4) | buf[i*2+1];
permutation(outBuf);
for (i = 0;i<4;i++) outData[i] = outBuf[i];
}
void CMyDes::expand(BYTE inData[], BYTE outData[])
{
int i;
for (i = 0; i<6;i++) outData[i] = 0;
for (i = 0; i<48;i++)
if ((inData[BitExp[i] >> 3] & (1 << (7-(BitExp[i] & 0x07)))) != 0)
outData[i >> 3] = outData[i >> 3] | (1 << (7-(i & 0x07)));
}
BYTE CMyDes::si(BYTE s, BYTE inByte)
{
BYTE c;
c = (inByte & 0x20) | ((inByte & 0x1e) >> 1) | ((inByte & 0x01) << 4);
return (sBox[s][c] & 0x0f);
}
void CMyDes::permutation(BYTE inData[])
{
BYTE newData[8];
BYTE bTemp[8];
int i;
for (i = 0;i<8;i++) newData[i] =0;
for (i = 0;i<6;i++) bTemp[i] = inData[i];
bTemp[6] = 0;
bTemp[7] = 0;
for (i = 0;i<64;i++)
{
if ((bTemp[BitIP[i] >> 3] & (1 << (7- (BitIP[i] & 0x07)))) != 0 )
newData[i >> 3] = newData[i >> 3] | (1 << (7-(i & 0x07)));
};
for (i = 0;i<8;i++) inData[i] = newData[i];
}
void CMyDes::conversePermutation(BYTE inData[])
{
BYTE newData[8];
int i;
for (i=0;i<8;i++) newData[i] = 0;
for (i=0;i<64;i++)
if ((inData[BitCP[i] >> 3] & (1 << (7-(BitCP[i] & 0x07)))) != 0)
newData[i >> 3] = newData[i >> 3] | (1 << (7-(i & 0x07)));
for (i=0;i<8;i++) inData[i] = newData[i];
}
void CMyDes::desData(DESMODE desMode, BYTE inData[], BYTE outData[])
{
int i,j;
BYTE temp[4],buf[4];
BYTE bTemp[8];
for (i=0;i<8;i++) outData[i] = inData[i];
for (i=0;i<8;i++) bTemp[i] = outData[i];
//初始變換
initPermutation(outData);
for (i=0;i<8;i++) bTemp[i] = outData[i];
if (desMode == dmEncry)
{
for (i=0;i<16;i++)
{
for (j=0;j<4;j++) temp[j] = outData[j];
for (j=0;j<4;j++) outData[j] = outData[j + 4];
encry(outData, subKey[i], buf);
for (int k=0;k<8;k++) bTemp[k] = outData[k];
for (j=0;j<4;j++) outData[j + 4] = temp[j] ^ buf[j];
}
for (j=0;j<4;j++) temp[j] = outData[j + 4];
for (j=0;j<4;j++) outData[j + 4] = outData[j];
for (j=0;j<4;j++) outData[j] = temp[j];
}
else if (desMode == dmDecry)
{
for(i=15;i>=0;i--)
{
for (j=0;j<4;j++) temp[j] = outData[j];
for (j=0;j<4;j++) outData[j] = outData[j + 4];
encry(outData, subKey[i], buf);
for (j=0;j<4;j++) outData[j + 4] = temp[j] ^ buf[j];
}
for (j=0;j<4;j++) temp[j] = outData[j + 4];
for (j=0;j<4;j++) outData[j + 4] = outData[j];
for (j=0;j<4;j++) outData[j] = temp[j];
}
conversePermutation(outData);
}
CString CMyDes::EncryStr(CString Str, CString Key)
{
BYTE KeyByte[8]={0},StrByte[8]={0},OutByte[8]={0};
int J,I;
int Strlength;
//if ((Strlength > 0) && (Str[Strlength]) == 0) return "";
while (strlen(Key) < 8) Key = Key + ' ' ;
while (strlen(Str) % 8 != 0) Str = Str +' ';
Strlength = (int)strlen(Str);
for (J=0;J<8;J++) KeyByte[J] = (Key[J]);
makeKey(KeyByte, subKey);
CString StrResult;
StrResult.Empty();
for (I = 0;I< Strlength/8;I++)
{
for (J=0;J<8;J++)
StrByte[J] = Str[I * 8 + J];
desData(dmEncry, StrByte, OutByte);
for (J=0;J<8;J++)
StrResult = StrResult+(char)OutByte[J];
};
return StrResult;
}
CString CMyDes::EncryStrHex(CString Str, CString Key)
{
int I;
CString TempResult,StrResult;
BYTE Temp;
TempResult = EncryStr(Str, Key);
StrResult.Empty();
for (I=0;(I<(int)strlen(TempResult));I++)
{
Temp = TempResult[I];
StrResult = StrResult + ByteToHex(Temp);
}
return StrResult;
}
CString CMyDes::ByteToHex(BYTE inByte)
{
CString ResultStr;
BYTE bTemp;
int iTemp;
ResultStr.Empty();
bTemp = inByte;
bTemp = bTemp & 0x0f;
iTemp = (int)bTemp;
switch (bTemp)
{
case 10:
ResultStr = "A";
break;
case 11:
ResultStr = "B";
break;
case 12:
ResultStr = "C";
break;
case 13:
ResultStr = "D";
break;
case 14:
ResultStr = "E";
break;
case 15:
ResultStr = "F";
break;
default:
ResultStr = (char)(bTemp+'0');
};
bTemp = inByte>>4;
switch (bTemp)
{
case 10:
ResultStr = "A"+ResultStr ;
break;
case 11:
ResultStr = "B"+ResultStr ;
break;
case 12:
ResultStr = "C"+ResultStr ;
break;
case 13:
ResultStr = "D"+ResultStr ;
break;
case 14:
ResultStr = "E"+ResultStr ;
break;
case 15:
ResultStr = "F"+ResultStr ;
break;
default:
ResultStr = (char)(bTemp+'0')+ResultStr ;
};
return ResultStr;
}
BYTE CMyDes::HexToByte(CString inHex)
{
BYTE bTemp,bTempH,bTempL;
bTempH = inHex[0];
bTempL = inHex[1];
if ((bTempL>='A') && (bTempL<='F'))
bTempL = bTempL-'A'+10;
if ((bTempL>='0') && (bTempL<='9'))
bTempL = bTempL-'0';
if ((bTempH>='A') && (bTempH<='F'))
bTempH = bTempH-'A'+10;
if ((bTempH>='0') && (bTempH<='9'))
bTempH = bTempH-'0';
bTemp = (bTempH<<4) | bTempL;
return bTemp;
}
CString CMyDes::BitToStr(BYTE inData)
{
CString ResultStr;
BYTE bTemp;
ResultStr.Empty();
for (int i=7; i>=0; i--)
{
bTemp = (inData>>i) & 1;
if (bTemp==0)
ResultStr = ResultStr + '0';
else
ResultStr = ResultStr + '1';
}
return ResultStr;
}
CString CMyDes::ByteToStr(BYTE inData[], int iLength)
{
CString ResultStr;
ResultStr.Empty();
int i;
for (i=0; i<iLength; i++)
{
ResultStr = ResultStr + BitToStr(inData[i]);
}
return ResultStr;
}
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