www.pudn.com > endecipher.rar > Des.cpp
// Des.cpp: implementation of the CDes class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "Cipher.h"
#include "Des.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CDes::CDes()
{
key=new char[10];
}
CDes::~CDes()
{
delete []key;
}
unsigned char left[32];
unsigned char right[32];
unsigned char brige[32]; //中介作用
unsigned char zhong[32];
unsigned char large[48]; //由右部拓展得到48位
unsigned char bitci[64];
unsigned char bitpl[64];
unsigned char bitip[64];
unsigned char e1key[64];
unsigned char e2key[56];
unsigned char fkey[48];
int ip1[64]={
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,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6};
int ip2[64]={
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,
32, 0, 40, 8, 48, 16, 56, 24};
int lage[48]={
31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12,
11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20,
19, 20, 21, 22, 23, 24,
23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 0};
int change[32]={
15, 6, 19, 20,
28, 11, 27, 16,
0, 14, 22, 25,
4, 17, 30, 9,
1, 7, 23, 13,
31, 26, 2, 8,
18, 12, 29, 5,
21, 10, 3, 24};
/*移位次数*/
int lstime[16]={
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
/*pc-1*/
static unsigned char pc1[56] = {
56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3 };
/*pc-1*/
static unsigned char pc2[48] = {
13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54,
29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31 };
static unsigned char s1[4][16] = {
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 };
/* Table - s2 */
static unsigned char s2[4][16] = {
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 };
/* Table - s3 */
static unsigned char s3[4][16] = {
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 };
/* Table - s4 */
static unsigned char s4[4][16] = {
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 };
/* Table - s5 */
static unsigned char s5[4][16] = {
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 };
/* Table - s6 */
static unsigned char s6[4][16] = {
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 };
/* Table - s7 */
static unsigned char s7[4][16] = {
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 };
/* Table - s8 */
static unsigned char s8[4][16] = {
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 };
void CDes::ls1() //左移1位
{
int t,i;
t=e2key[0];
for(i=0;i<=26;i++)
e2key[i]=e2key[i+1];
e2key[27]=t;
t=e2key[28];
for(i=28;i<=54;i++)
e2key[i]=e2key[i+1];
e2key[55]=t;
}
void CDes::rs1() //右移1位
{
int t,i;
t=e2key[27];
for(i=27;i>0;i--)
e2key[i]=e2key[i-1];
e2key[0]=t;
t=e2key[55];
for(i=55;i>28;i--)
e2key[i]=e2key[i-1];
e2key[28]=t;
}
void CDes::lst(int time)
{
int i;
for(i=1;i<=time;i++)
ls1();
}
void CDes::rst(int time)
{
int i;
for(i=1;i<=time;i++)
rs1();
}
void CDes::IP1()
{
int i;
for(i=0;i<64;i++)
bitip[i]=bitpl[ip1[i]];
for(i=0;i<64;i++)
bitpl[i]=bitip[i];
}
void CDes::IP2()
{
int i;
for(i=0;i<64;i++)
bitip[i]=bitci[ip2[i]];
for(i=0;i<64;i++)
bitci[i]=bitip[i];
}
void CDes::getkey(CString s)
{
strcpy(key,s);
}
char * CDes::Deci(char cipher[])
{
int i,j,t,s,w,T;
char * plain=new char[strlen(cipher)+1];
for(i=0;i<=7;i++)
{
t=key[i];
for(j=0;j<=7;j++)
{
e1key[i*8+7-j]=t%2;
t/=2;
}
}
for(i=0;i<64;i++)
bitpl[i]=cipher[i]-'0';
IP1();
for(i=0;i<32;i++) //初始化左部
left[i]=bitpl[i];
for(i=32;i<64;i++) //初始化右部
right[i-32]=bitpl[i];
for(i=0;i<56;i++)
e2key[i]=e1key[pc1[i]];
for(i=0;i<16;i++)
lst(lstime[i]);
for(T=0;T<16;T++) //循环16次
{
for(i=0;i<32;i++)
brige[i]=right[i]; //复制一份右部
for(i=0;i<48;i++)
fkey[i]=e2key[pc2[i]]; //由56产生48密钥
//拓展右部
for(i=0;i<48;i++){
large[i]=right[lage[i]];
large[i]^=fkey[i];
}
//s盒替换
i=0; //s1
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s1[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=6; //s2
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s2[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=12; //s3
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s3[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=18; //s4
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s4[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=24; //s5
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s5[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=30; //s6
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s6[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=36; //s7
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s7[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=42; //s8
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s8[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
//p盒置换,异或得到R(i+1)
for(i=0;i<32;i++){
right[i]=zhong[change[i]];
right[i]^=left[i];
left[i]=brige[i];
}
rst(lstime[15-T]);
}
for(i=0;i<32;i++)
bitci[i]=right[i];
for(i=0;i<32;i++)
bitci[i+32]=left[i];
IP2();
w=0;
for(i=0;i<64;i++){
w=(w<<1)+bitci[i];
if(i%8==7)
{
plain[i/8]=w;
w=0;
}
}
plain[8]='\0';
return plain;
}
char * CDes::Enci(char plain[])
{
int i,j,t,s,w,T;
char * cipher=new char[65];
for(i=0;i<=7;i++)
{
t=key[i];
s=plain[i];
for(j=0;j<=7;j++)
{
e1key[i*8+7-j]=t%2;
bitpl[i*8+7-j]=s%2;
t/=2;
s/=2;
}
}
IP1();
for(i=0;i<32;i++) //初始化左部
left[i]=bitpl[i];
for(i=32;i<64;i++) //初始化右部
right[i-32]=bitpl[i];
for(i=0;i<56;i++)
e2key[i]=e1key[pc1[i]];
for(T=0;T<16;T++) //循环16次
{
lst(lstime[T]);
for(i=0;i<32;i++)
brige[i]=right[i]; //复制一份右部
for(i=0;i<48;i++)
fkey[i]=e2key[pc2[i]]; //由56产生48密钥
//拓展右部
for(i=0;i<48;i++){
large[i]=right[lage[i]];
large[i]^=fkey[i];
}
//s盒替换
i=0; //s1
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s1[s][t];
// printf("%d ",w);
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=6; //s2
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s2[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=12; //s3
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s3[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=18; //s4
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s4[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=24; //s5
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s5[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=30; //s6
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s6[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=36; //s7
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s7[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
i=42; //s8
s=(large[i]<<1)+large[i+5];
t=(large[i+1]<<3)+(large[i+2]<<2)+(large[i+3]<<1)+large[i+4];
w=s8[s][t];
for(j=0;j<4;j++)
{
zhong[i/6*4+3-j]=w%2;
w/=2;
}
//p盒置换,异或得到R(i+1)
for(i=0;i<32;i++){
right[i]=zhong[change[i]];
right[i]^=left[i];
left[i]=brige[i];
}
}
for(i=0;i<32;i++)
bitci[i]=right[i];
for(i=0;i<32;i++)
bitci[i+32]=left[i];
IP2();
for(i=0;i<64;i++)
cipher[i]='0'+bitci[i];
cipher[i]='\0';
return cipher;
}