DES加密算法的实现Word格式文档下载.docx
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DES加密算法的实现Word格式文档下载.docx
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string.h"
#defineucharunsignedchar
/***************明文转换声明部分**************/
//IP1置换表
intIP_1[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};
//IP2逆置换表
intIP_2[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};
//E扩展置换表
intE_case[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};
//S盒压缩
intS1[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};
intS2[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};
intS3[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};
intS4[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};
intS5[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};
intS6[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};
intS7[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};
intS8[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};
//P盒置换
intPermute[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};
/************字节与二进制相互变换部分******************/
//字节转换成二进制
intByteToBit(charch,charbit[8])
{
ucharx;
for(x=0;
x<
8;
x++)
{
*(bit+x)=((ch<
<
x)&
0x80)>
>
7;
}
return0;
}
//字符串转换成二进制位串
intChar8ToBit64(charch[8],charbit[64])
ByteToBit(*(ch+x),bit+(x<
3));
//二进制转换成字节
intBitToByte(charbit[8],char*ch)
*ch|=*(bit+x)<
(7-x);
//将二进制串转换成字符串
intBit64ToChar8(charbit[64],charch[8])
memset(ch,0,8);
//把ch[8]全部清零。
BitToByte(bit+(x<
3),ch+x);
/***************密钥声明部分*******************/
//密钥PC-1置换表
intPC_1[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};
//密钥PC-2置换表
intPC_2[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};
//密钥每次轮回移位表
ucharLeft_Move[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
/*************密钥的生成函数部分**************************/
//PC-1置换函数
intPC1_permute(charpc1[64],charPC1_Buff[56])
56;
PC1_Buff[x]=pc1[PC_1[x]-1];
//PC密钥左移
intKeyLeftMove(charpcB[56],charMove)
charCn[28],Dn[28];
chara_buff,b_buff,c_buff,d_buff;
//**********PC-1密钥56位分离成左右各28位**************
memcpy(Cn,pcB,28);
memcpy(Dn,pcB+28,28);
//*****************PC密钥左移部分*******************
a_buff=Cn[0];
b_buff=Dn[0];
if(2==Move)
c_buff=Cn[1];
d_buff=Dn[1];
28;
if(27==x)
{
if(1==Move)
{
Cn[27]=a_buff;
Dn[27]=b_buff;
}
if(2==Move)
Cn[26]=a_buff;
Cn[27]=c_buff;
Dn[26]=b_buff;
Dn[27]=d_buff;
}
else
Cn[x]=Cn[x+Move];
Dn[x]=Dn[x+Move];
//******************28bit合成56bit********************
memcpy(pcB,Cn,28);
memcpy(pcB+28,Dn,28);
}
//PC-2逆置换函数
intPC2_permut(charpc2[56],charPC2_Buff[48])
48;
PC2_Buff[x]=pc2[PC_2[x]-1];
//产生16轮的子密钥函数
intKey16Itera(charkey[64],charsubKeys[16][48])
ucharx,move;
chartemp1[56];
PC1_permute(key,temp1);
//PC1置换,返回值temp
16;
move=Left_Move[x];
KeyLeftMove(temp1,move);
//移位,返回值temp,56bit
PC2_permut(temp1,subKeys[x]);
/***********明文加密函数部分*************/
//IP置换
intIP1_permute(charIP1[64])
charIP1Buff[64];
64;
IP1Buff[x]=IP1[IP_1[x]-1];
memcpy(IP1,IP1Buff,64);
//32bit经E盒扩展成48bit
intR_Expand48bit(charR[32],charRE[48])
RE[x]=R[E_case[x]-1];
//IP64逆置换
intIP2_permute(charIP2[64])
chartemp2[64];
temp2[x]=IP2[IP_2[x]-1];
memcpy(IP2,temp2,64);
//经P盒置换
intPcase(charS8Byte[32])
chartemp3[32];
32;
temp3[x]=S8Byte[Permute[x]-1];
memcpy(S8Byte,temp3,32);
}
//经S盒压缩成32bit
intReduceto32bit(charEKey[48],charS32bit[32])
ucharx,Rank,Line;
intout;
Rank=(EKey[1+6*x]<
3)|(EKey[2+6*x]<
2)|(EKey[3+6*x]<
1)|(EKey[4+6*x]);
Line=(EKey[6*x]<
1)|(EKey[5+6*x]);
//在S盒寻找需要的数
if(0==x){out=S1[Line][Rank];
if(1==x){out=S2[Line][Rank];
if(2==x){out=S3[Line][Rank];
if(3==x){out=S4[Line][Rank];
if(4==x){out=S5[Line][Rank];
if(5==x){out=S6[Line][Rank];
if(6==x){out=S7[Line][Rank];
if(7==x){out=S8[Line][Rank];
//把一位数拆成数四位数
S32bit[4*x+0]=(((char)(out))&
0x08)>
3;
S32bit[4*x+1]=(((char)(out))&
0x04)>
2;
S32bit[4*x+2]=(((char)(out))&
0x02)>
1;
S32bit[4*x+3]=(((char)(out))&
0x01);
/***************明文16次迭代,加密,**********************
***************输入值:
mw[64]\子密钥:
miyue[16][48]************
***************返回值:
data[64]***********************/
intEncryp(chardata[64],charZkey16[16][48])
ucharx,y;
charLeft[32],Right[32],EKbuff[48];
charSE32bit[32];
IP1_permute(data);
memcpy(Left,data,32);
//分离32bit
memcpy(Right,data+32,32);
{
R_Expand48bit(Right,EKbuff);
//E盒扩展
for(y=0;
y<
y++)//与密钥异或
EKbuff[y]^=Zkey16[x][y];
}
Reduceto32bit(EKbuff,SE32bit);
//经S盒压缩32bit,返回值SE32bit
Pcase(SE32bit);
//经P盒置换,返回值SE32bit
for(y=0;
y++)//与左半部分Left32bit异或
SE32bit[y]^=Left[y];
memcpy(Left,Right,32);
memcpy(Right,SE32bit,32);
memcpy(data,Right,32);
//合成64bit
memcpy(data+32,Left,32);
IP2_permute(data);
//IP逆置换
/**********************密文输入,解密,16次迭代************************
**************************输入值:
miwen[64]****************************
***************************输出值:
mw[64]******************************/
intDecryp(charmiwen[64],charD_Zkey16[16][48])
charD_Left[32],D_Right[32];
charD_EKbuff[48],D_SE32bit[32];
IP1_permute(miwen);
//IP1置换。
memcpy(D_Left,miwen,32);
memcpy(D_Right,miwen+32,32);
for(x=16;
x>
0;
x--)//16轮迭代
R_Expand48bit(D_Right,D_EKbuff);
D_EKbuff[y]^=D_Zkey16[x-1][y];
Reduceto32bit(D_EKbuff,D_SE32bit);
//经S盒压缩32bit,返回值D_SE32bit。
Pcase(D_SE32bit);
//经P盒置换,返回值SE32bit
y++)
D_SE32bit[y]^=D_Left[y];
memcpy(D_Left,D_Right,32);
memcpy(D_Right,D_SE32bit,32);
memcpy(miwen,D_Right,32);
//合成64bit
memcpy(miwen+32,D_Left,32);
IP2_permute(miwen);
//IP逆置换
/******************主函数部分*****************/
intmain(void)
charMingW64bit[64],MingW8Byte[8];
charKey64bit[64],Key8Byte[8];
charKey16[16][48],temp2[64];
charMybuff[8];
printf("
请输入密钥:
\n"
);
scanf("
%s"
Key8Byte);
Char8ToBit64(Key8Byte,Key64bit);
//密钥字符串置换成二进制串
x++)//补偿足8位奇偶校验位
memcpy(temp2+8*x,Key64bit+7*x,7);
temp2[x*8+7]=1;
memcpy(Key64bit,temp2,64);
Key16Itera(Key64bit,Key16);
//生成子密钥
请输入明文:
MingW8Byte);
Char8ToBit64(MingW8Byte,MingW64bit);
//明文字符串置换成二进制串
/*************************************************************************
**************************解密部分***************************
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