📄 cedc.~cpp
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//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include <stdio.h>
#include "CEDC.h"
//////////////////////////////////////////////////////////////////////////
char *inname, *outname;
FILE *infile, *outfile;
int outcount=0;
int encrypting;
char buf[512];
char keyx[9],keyy[9];
int bytebit[]={0x80,0x40,0x20,0x10,0x8,0x4,0x2,0x1};
int nibblebit[]={0x8,0x4,0x2,0x1};
char iperm[16][16][8],fperm[16][16][8];
char s[4][4096];
char p32[4][256][4];
char kn[16][6]; /* 密钥*/
char pc1m[56];
char pcr[56];
char ip[] /* 初始换位表*/
= { 58, 50, 42, 34, 26, 18, 10, 2, /*输入的第58比特，在输出时被*/
60, 52, 44, 36, 28, 20, 12, 4, /*置换到第1比特的位置*/
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 };
char fp[] /* 最后换位表*/
= { 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 };
char pc1[] /* 密鈅的压缩型换位表pc1表*/
= { 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 };
char totrot[] /* 密钥生成中的循环左移位的累计次数*/
= { 1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28};
char pc2[] /* 密鈅的压缩型换位表pc2表*/
= { 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 };
char si[8][64] /* 48->32 bit 压缩表*/
= { /* S[1] */
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,
/* S[2] */
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,
/* S[3] */
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,
/* S[4] */
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,
/* S[5] */
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,
/* S[6] */
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,
/* S[7] */
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,
/* S[8] */
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 };
char p32i[] /* 32-bit 单纯换位表*/
= { 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 };
//////////////////////////////////////////////////////////////////////////
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TEDCForm *EDCForm;
//---------------------------------------------------------------------------
__fastcall TEDCForm::TEDCForm(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::BitBtn1Click(TObject *Sender)
{
register char *u;
char *filename;
BitBtn1->Enabled=false;
inname=new char[40];// malloc(strlen(inname) + 5);
strcpy(inname,Edit1->Text.c_str()); //*argv;
outname=new char[strlen(inname)+5];// malloc(strlen(inname) + 5);
filename=new char[strlen(inname)+5];//malloc(strlen(inname) + 5);
strcpy(filename,inname);
u=&filename[strlen(filename)-4]; /* 检查最后4个字符*/
encrypting=(strcmp(".des",u)!=0);
if(!encrypting)*u=0; /* 解密时输出文件去掉.des*/
else strcat(filename,".des"); /* 加密时给输出文件加上.des*/
strcpy(outname,filename);
if((infile=fopen(inname, "rb")) == NULL)
{
Application->MessageBoxA("不能打开源文件！","错误",0);
return;
}
if((outfile=fopen(outname,"rb"))!=NULL)
{
if(Application->MessageBox("文件存在，要覆盖吗?",NULL,1)==IDOK)
goto A;
else
return;
}
A:; if((outfile=fopen(outname,"wb"))==NULL)
{
Application->MessageBoxA("不能打开输出文件！","错误",0);
return;
}
key_get(); /*取得八字节密钥*/
strcpy(keyx,keyy);
desinit(keyx); /*建立用于des运算的矩阵*/
if(pfile()==0)
unlink(inname);
else
Application->MessageBoxA("输入/输出错误！","错误",0);
fclose(outfile);
fclose(infile);
Application->MessageBoxA(" 加/脱密完毕！ ","消息",0);
delete inname;
delete outname;
delete filename;
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::key_get() /*输入密码*/
{
register int i, j;
char linebuf[256];
int count;
count=Edit2->Text.Length(); /*密钥长度*/
strcpy(linebuf,Edit2->Text.c_str());
linebuf[count]=0; /* 添加一个0作为字符串的结束*/
if(linebuf[count-1]=='\n')
{
linebuf[count-1]=0; /*把"\n"变成0*/
count--;
}
if(count>16)count=16; /* 只取16个字符*/
for(i=0;i<16;i++)
{
switch(linebuf[i])
{
case 'A':
linebuf[i]=0x0A;break;
case 'B':
linebuf[i]=0x0B;break;
case 'C':
linebuf[i]=0x0C;break;
case 'D':
linebuf[i]=0x0D;break;
case 'E':
linebuf[i]=0x0E;break;
case 'F':
linebuf[i]=0x0F;break;
}
if(!(i%2))linebuf[i]=linebuf[i]<<4;
}
for(count=0,i=0;i<16;i+=2)
linebuf[count++]=linebuf[i]^linebuf[i+1];
count=8; /* 只取 8 字节 */
for(i=j=0; count--;)
keyy[i++]=linebuf[j++];
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::desinit(char *key)/* 初始化各种变换矩阵*/
{
#ifdef DEBUG
/*deb*/ Label5->Caption="Initial perm init.";
#endif
perminit(iperm,ip);
#ifdef DEBUG
/*deb*/ Label5->Caption="Final perm init.";
#endif
perminit(fperm,fp);
#ifdef DEBUG
/*deb*/ Label5->Caption="Key sched init.";
#endif
kinit(key);
#ifdef DEBUG
/*deb*/ Label5->Caption="Compression init.";
#endif
sinit(); /* 初始化s1-s8矩阵*/
#ifdef DEBUG
/*deb*/ Label5->Caption="32-bit perm init.";
#endif
p32init();
#ifdef DEBUG
/*deb*/ Label5->Caption="End init.";
#endif
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::sinit()/* 初始化s1-s8矩阵*/
{
register int i,j;
for(i=0;i<4;i++) /* 48位按四个12位(一个半字节)来输入*/
for(j=0;j<4096;j++) /*4095=1111 1111 1111B*/
s[i][j]=(getcomp(i*2,j>>6)<<4)|(0x0F&getcomp(i*2+1,j&0x3F));
/*每个s项为一个字节,存有两个体代数*/
}
//---------------------------------------------------------------------------
int __fastcall TEDCForm::getcomp(int k,int v)
/*用s[k]盒对v进行6bit~4bit的数据压缩*/
//int k,v; /*只取6bits的中间4bits*/
{
register int i,j;
i=((v&0x20)>>4)|(v&1); /*i为每个s盒的行号改行号由v的第一位和最后一位组成*/
j=(v&0x1F)>>1; /*j位s盒的列号,该列号由v的中间四位组成*/
return(int)si[k][(i<<4)+j]; /*返回对v压缩后的值*/
/*
FILE *fg;
if((fg=fopen("e:\\ajx\\perm.txt","w+"))==NULL)
{
Application->MessageBoxA("不能打开输出文件！","错误",0);
return;
}
fprintf(fg,"%d,",perm[i][j][k]);
fclose(fg);
*/
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::perminit(char perm[16][16][8],char p[64])
/* 初始化换位表,用IP表对输入的64bit进行换位*/
//char perm[16][16][8]; /* 64-bit, 完成换位的中间的过渡矩阵*/
//char p[64];
{
register int L, j, k;
int i,m;
for(i=0;i<16;i++) /* 每一个输入的4 bit(4*16)*/
for(j=0;j<16;j++) /* 每一个4 bit的可能值~[0,16]*/
for(k=0;k<8;k++) /* 每一个屏蔽字*/
perm[i][j][k]=0; /* 过渡矩阵清零*/
for(i=0;i<16;i++) /* 每一个输入的4 bit*/
for(j=0;j<16;j++) /* 每一个4 bit的可能值~[0,16]*/
for (k=0;k<64;k++) /* 每一个输出bit的位置*/
{
L=p[k]-1; /* p[k]最小值为l,l从0开始*/
if((L>>2)!=i) /* L~[0,63],每四位一组,共十六组,因此要L>>2*/
continue; /*确定L的组数*/
if(!(j&nibblebit[L&3]))/*确定第L~[0,63]位是一个四位组中的第几位跑k*/
continue; /*nibblebit[]={8,4,2,1}*/
m=k&0x07; /*确定第k~[0,63]位是一个字节中的第几位*/
/*k&07->取k的后3bits->m是一个字节中的第0~7位*/
perm[i][j][k>>3]|=bytebit[m];
} /*bytebit[]={128,64,32,16,8,4,2,1}*/
}
//---------------------------------------------------------------------------
void __fastcall TEDCForm::iter(int num,char *inblock,char *outblock)
/* 完成第num层的变换*/
//int num;
//char *inblock, *outblock; /* 64 bits */
{
char fret[4]; /* 放置f(R[i-1],key)的返回值*/
register char *ib,*ob,*fb;
ob=outblock;
ib=&inblock[4]; /*右边32位*/
f(ib,num,fret);
*ob++=*ib++; /* L[i] = R[i-1] */
*ob++=*ib++;
*ob++=*ib++;
*ob++=*ib++;
ib=inblock; fb=fret; /* R[i]=L[i] XOR f(R[i-1],key) */
*ob++=*ib++^*fb++;
*ob++=*ib++^*fb++;
*ob++=*ib++^*fb++;
*ob++=*ib++^*fb++;
}
//---------------------------------------------------------------------------
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