DES源代码C语言实现简洁易懂Word格式文档下载.docx
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DES源代码C语言实现简洁易懂Word格式文档下载.docx
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/*S盒*/
intS[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}}};
/*置换选择1*/
intPC_1[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};
/*置换选择2*/
intPC_2[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};
//把8X6的数组变成一个一维数组
voidchange1(intE[8][6],intr[48])
{
inti,j;
for(i=0;
i<
8;
i++)
{
for(j=0;
j<
6;
j++)
{
r[i*6+j]=E[i][j];
}
}
}
//把一维数组变成8X6的矩阵
voidchange2(intr[48],intE[8][6])
E[i][j]=r[i*6+j];
//输入16进制明文
voidinput(intM[8][8])
{
inti,j,k;
charc[16];
ints[16],d[64],a[16][4];
printf("
请输入16位16进制数:
"
);
16;
scanf("
%c"
&
c[i]);
if(c[i]>
=48&
&
c[i]<
=58)
s[i]=c[i]-48;
elseif(c[i]>
='
A'
Z'
)
s[i]=c[i]-55;
a'
z'
s[i]=c[i]-87;
else
puts("
error\n"
return;
//把16进制数组c[]转化为二进制数:
k=0;
while(k<
16)//每一位分解为四位,注意输出顺序就可以了
for(j=3;
j>
=0;
j--)
{
a[k][j]=s[k]%2;
s[k]/=2;
k++;
//把a[16][4]转化成a[8][8]类型数组
for(k=0;
k<
k++)
for(j=0;
4;
d[k*4+j]=a[k][j];
for(i=0;
M[i][j]=d[i*8+j];
/*
//打印密文二进制数组
%2d"
M[i][j]);
\n"
*/
/*初始置换*/
voidStartedexchange(intMW[8][8],inttemp[8][8])
inti,j,a[64],b[64];
a[i*8+j]=MW[i][j];
64;
b[i]=a[IP_Table[i]];
temp[i][j]=b[i*8+j];
/*for(i=0;
temp[i][j]);
/*生成秘钥*/
voidbornkey(intMY[8][8],intn,intkey[48])
inti,j,m;
inttem,tem2;
intk[64],k1[56];
inta[8][7];
intc[28],d[28];
intlist[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
k[i*8+j]=MY[i][j];
7;
a[i][j]=k[PC_1[i*7+j]];
printf("
%d"
a[i][j]);
printf("
//c0,d0
c[i*7+j]=a[i][j];
for(i=4;
d[i*7+j-28]=a[i][j];
//确定左移位数
m=0;
n;
m+=list[i];
//循环左移处理
while(m)
tem=c[0];
27;
c[i]=c[i+1];
c[27]=tem;
tem2=d[0];
d[i]=d[i+1];
d[27]=tem2;
m--;
28;
d[i]);
//合并
k1[i]=c[i];
k1[28+i]=d[i];
//置换选择2
48;
key[i]=k1[PC_2[i]];
//第一次异或
voidfirstXOR(intkey[48],intR[48],intk2[48])
inti;
if(R[i]!
=key[i])
k2[i]=1;
k2[i]=0;
//S盒压缩变换
voidSchange(intk2[48],intk3[32])
inti,h,l,a,temp,k,m,j;
intb[8][6];
intnum[4];
change2(k2,b);
m=0;
//printf("
h=2*b[i][0]+b[i][5];
l=8*b[i][1]+4*b[i][2]+2*b[i][3]+b[i][4];
a=S[i][h][l];
%d"
a);
//把a装换成二进制输出
k=3;
while(a!
=0)
temp=a%2;
a=a/2;
num[k]=temp;
k--;
while(k>
num[k]=0;
k--;
k3[m]=num[j];
m++;
//置换运算P
voidPchange(intk3[32],intp[32])
32;
p[i]=k3[P_Table[i]];
//拓展变换
voidextension(inta[32],intb[48])
inti;
b[i]=a[E_Table[i]];
voidfeistel(intR[32],intkey[48],intp[32])
intb[48],k2[48],k3[32];
extension(R,b);
firstXOR(key,b,k2);
//key后半部分出现问题
Schange(k2,k3);
Pchange(k3,p);
//第二次异或
voidSecondXOR(intL[32],intp[32],intR1[32])
if(L[i]!
=p[i])
R1[i]=1;
else
R1[i]=0;
/*把明文分成两部分32+32*/
voiddivideLR(inttemp[8][8],intL[32],intR[32])
L[i*8+j]=temp[i][j];
R[i*8+j]=temp[i+4][j];
voidexchange(intR[32],intL[32])
L[i]=R[i];
//逆初始置换
voidrestartexchange(intL[32],intR[32],intsecret[64])
inta[64];
a[i]=L[i];
a[32+i]=R[i];
secret[i]=a[IP_1_Table[i]];
//将二进制数转化为16进制
voidBtoOX(inta[64],charb[16])
inti,j,k,n,r;
n=0;
k=8;
r=0;
for(j=1;
5;
r+=a[n]*k;
k=k/2;
n++;
if(r<
10)
b[i]=r+48;
b[i]=r+55;
voidmain()
inti,j,a;
intMW[8][8];
//密文
intMY[8][8];
//秘钥
inttemp[8][8];
//过渡数组
intL[32];
//左边加密部分
intR[32];
//右边加密部分
intR1[32];
intkey[48];
//生成的秘钥
intp[32];
intsecret[64];
//密文二进制表示
charmiwen[16];
请输入明文:
input(MW);
getchar();
Startedexchange(MW,temp);
divideLR(temp,L,R);
请输入秘钥:
input(MY);
a=1;
while(a<
=15)
bornkey(MY,a,key);
//true
feistel(R,key,p);
SecondXOR(L,p,R1);
exchange(R,L);
exchange(R1,R);
a++;
//第16次迭代
bornkey(MY,16,key);
exchange(R1,L);
restartexchange(L,R,secret);
BtoOX(secret,miwen);
miwen[i]);
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