?? des.cpp
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// Des.cpp: implementation of the CDes class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "MixedCS.h"
#include "Des.h"
#include "Window.h"
#include "GfL.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
///////////////////////////////////////////////////////////////////////////////
// DES Tables Define
///////////////////////////////////////////////////////////////////////////////
// initial permutation IP
const static char IP_Table[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
};
// final permutation IP^-1
const static char IPR_Table[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
};
// expansion operation matrix
static const char E_Table[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
};
// 32-bit permutation function P used on the output of the S-boxes
const static char P_Table[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
};
// permuted choice table (key)
const static char PC1_Table[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
};
// permuted choice key (table)
const static char PC2_Table[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, 30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
// number left rotations of pc1
const static char LOOP_Table[16] =
{
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
// The (in)famous S-boxes
const static char S_Box[8][4][16] =
{
// 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
};
///////////////////////////////////////////////////////////////////////////////
// CDes Functions
///////////////////////////////////////////////////////////////////////////////
#define CHECK(x) {if( !(x) ) return false;}
#define CHECK_MSG(x,msg) {if( !(x) ){CWindow::ShowMessage(msg);return false;}}
#define FILE_CHECK(x,file) {if( !(x) ) {RunError(file);return false;}}
/******************************************************************************/
// 名稱：Encrypt
// 功能：加密
// 參數：KeyStr為0結尾的密鑰串，長度<=16，可為任意字符
// 返回：加密成功返回true，否則返回false
// 備注：當密鑰長度>8時，系統自動使用3次DES加密
// 更新：2002/12/25
// 作者：0200980胡德華
/******************************************************************************/
bool CDes::Encrypt(const char *OutFile,const char *InFile,const char *KeyStr)
{
CHECK( KeyStr && OpenFile(OutFile,InFile) )
FILE_CHECK( Encrypt(fh_out,fh_in,KeyStr),OutFile )
CloseFile();
return true;
}
/******************************************************************************/
// 名稱：Decrypt
// 功能：解密
// 參數：KeyStr為0結尾的密鑰串，長度<=16，可為任意字符
// 返回：解密成功返回true，否則返回false
// 備注：當密鑰長度>8時，系統自動使用3次DES解密
// 更新：2002/12/25
// 作者：0200980胡德華
/******************************************************************************/
bool CDes::Decrypt(const char *OutFile,const char *InFile,const char *KeyStr)
{
CHECK( KeyStr && OpenFile(OutFile,InFile) )
FILE_CHECK( Decrypt(fh_out,fh_in,KeyStr),OutFile )
CloseFile();
return true;
}
/******************************************************************************/
// 名稱：Encrypt
// 功能：加密
// 參數：fh_out,fh_in為輸入輸出句柄；KeyStr為0結尾的密鑰串，長度<=16，可為任意字符
// 返回：加密成功返回true，否則返回false
// 備注：當密鑰長度>8時，系統自動使用3次DES加密
// 更新：2002/12/25
// 作者：0200935王俊川
/******************************************************************************/
bool CDes::Encrypt(HFILE &fh_out,HFILE &fh_in,const char *KeyStr)
{
CWindow wnd;
long len,k=0,TBlock;
// 設置子密鑰
CHECK( SetSubKey(KeyStr) )
// 版本信息
deshead.Ver = 1;
// 文件長度信息
deshead.TLen = GetFileSize((HANDLE)fh_in,0);
// 計算總塊數
TBlock=(deshead.TLen+BUFSIZE-1)/BUFSIZE;
// 加密密鑰串(用于解密時驗證密鑰的正確性)
memset(deskey,0,16);
strcpy(deskey,KeyStr);
Encrypt(deshead.DesKey,deskey,16);
// 寫入信息頭
_lwrite(fh_out,(char*)&deshead,sizeof(deshead));
// 顯示等待光標
wnd.ShowWaitCursor();
// 讀取明文到緩沖區
while( (len=_lread(fh_in,databuf,BUFSIZE)) >0 )
{ // 顯示加密進度
wnd.SetWindowCaption("共計%d塊數據，DES正在加密第%d塊......",TBlock,++k);
// 將緩沖區長度變為8的倍數
len = ((len+7)>>3)<<3;
// 在緩沖區中加密
Encrypt(databuf,databuf,len);
// 將密文寫入輸出文件
_lwrite(fh_out,databuf,len);
}
// 結束等待光標
wnd.EndWaitCursor();
return true;
}
/******************************************************************************/
// 名稱：Decrypt
// 功能：解密
// 參數：fh_out,fh_in為輸入輸出句柄；KeyStr為0結尾的密鑰串，長度<=16，可為任意字符
// 返回：解密成功返回true，否則返回false
// 備注：當密鑰長度>8時，系統自動使用3次DES解密
// 更新：2002/12/25
// 作者：0200935王俊川
/******************************************************************************/
bool CDes::Decrypt(HFILE &fh_out,HFILE &fh_in,const char *KeyStr)
{
CWindow wnd;
long len,k=0,TBlock;
// 設置子密鑰
CHECK( SetSubKey(KeyStr) )
// 讀取信息頭并檢查長度
CHECK_MSG( _lread(fh_in,&deshead,sizeof(deshead)) == sizeof(deshead),
"錯誤：該文件不是有效的DES加密文件!" )
// 版本控制
CHECK_MSG( deshead.Ver ==1,"該版程序無法解密此文件。\n請使用該程序的最新版。")
// 解密密鑰串
Decrypt(deshead.DesKey,deshead.DesKey,16);
// 驗證密鑰的正確性
memset(deskey,0,16);
strcpy(deskey,KeyStr);//密鑰串長度一定<=16
CHECK_MSG( !memcmp(deshead.DesKey,deskey,16), "錯誤：DES密鑰不正確! ");
// 計算總塊數
TBlock=(deshead.TLen+BUFSIZE-1)/BUFSIZE;
// 顯示等待光標
wnd.ShowWaitCursor();
// 讀取密文到緩沖區
while( (len=_lread(fh_in,databuf,BUFSIZE)) >0 )
{ // 顯示解密進度
wnd.SetWindowCaption("共計%d塊數據，DES正在解密第%d塊......",TBlock,++k);
// 將緩沖區長度變為8的倍數
len = ((len+7)>>3)<<3;
// 在緩沖區中解密
Decrypt(databuf,databuf,len);
// 將明文寫入輸出文件
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