C语言DES加密解密算法Word文档下载推荐.docx
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C语言DES加密解密算法Word文档下载推荐.docx
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20,21,22,23,24,25,
24,25,26,27,28,29,
28,29,30,31,32,1},//扩展E盒
miyao[16][48];
intPC2[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};
intShe[512]={
//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
};
//S盒表
intPhe[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},Phes[32];
voidmiyaocs()//C与D产生
{
inti,n,m;
//密钥PC1产生
for(i=0;
i<
=55;
i++)
key[i]=am[miyaohe[i]-1];
//cc,dd产生
=27;
{
cc[i]=key[i];
dd[i]=key[i+28];
}
//Ci与Di的产生
for(n=0;
n<
=15;
n++)
if(n==0||n==1||n==8||n==15)
if(n==0){C[n][i]=cc[(i+1)%28];
D[n][i]=dd[(i+1)%28];
}
else{C[n][i]=C[n-1][(i+1)%28];
D[n][i]=D[n-1][(i+1)%28];
}
}
else{
for(i=0;
{
C[n][i]=C[n-1][(i+2)%28];
D[n][i]=D[n-1][(i+2)%28];
}
//密钥的产生
16;
{key[n]=C[i][n];
key[n+28]=D[i][n];
for(m=0;
m<
48;
m++)
{miyao[i][m]=key[PC2[m]-1];
voidmain()
intb[64],i,j,k,z,n,miwen[64],nimi[64],aam2[64];
charaa[8],ab[16],aam[8];
//置换
//明文输入
printf("
请输入明文:
"
);
8;
scanf("
%x"
&
aa[i]);
k=strlen(aa);
printf("
明文长度%d"
k);
if(k<
8)
{for(i=k;
k<
i++)aa[i]='
'
;
for(j=0;
j<
=7;
j++)
n=0x80;
k=aa[j]&
n;
k>
>
=(7-i);
n>
=1;
a1[j*8+i]=k;
//密钥输入
\n请输入密钥:
aam[i]);
k=aam[j]&
aam2[j*8+i]=k;
/*
if(i%8==0)printf("
\n"
%d"
aam2[i]);
*/
{
for(j=0;
am[i*8+j]=aam2[i*8+j];
for(i=0;
=63;
am[i]);
//第一次置换
=6;
)
{
for(i=7;
i>
=0;
i--)
if(n==0){k=7-i+j/2*8;
z=8*i+1+j;
else{k=7-i+j/2*8+32;
z=8*i+j;
b[k]=a1[z];
j=j+2;
置换1显示\n"
%d\t"
b[i]);
miyaocs();
//密钥产生
//L,R产生
32;
L[0][i]=b[i];
R[0][i]=b[i+32];
//轮改
for(j=0;
//E盒扩展R
=47;
RE[i]=R[j][a2[i]-1];
yh[i]=RE[i]+miyao[j][i];
if(yh[i]>
1)yh[i]=0;
//S盒的压缩
//n=i%16;
//列
k=yh[i*6]*2+yh[i*6+5];
//行
n=yh[i*6+1]*8+yh[i*6+2]*4+yh[i*6+3]*2+yh[i*6+4];
//k=i%4;
//行
/*
Sya[4*i+3]=She[k][n]/8;
Sya[4*i+2]=She[k][n]%8/4;
Sya[4*i+1]=She[k][n]%8%4/2;
Sya[4*i]=She[k][n]%2;
*/
LS=She[k*16+n+i*64];
for(z=0;
z<
=3;
z++)
Sya[4*i+3-z]=LS%2;
LS=LS/2;
//P置换
=31;
Phes[i]=Sya[Phe[i]-1];
//Ri+1Li+1
R[j+1][i]=L[j][i]+Phes[i];
if((R[j+1][i])>
1)R[j+1][i]=0;
L[j+1][i]=R[j][i];
//轮改后密文
miwen[i]=R[16][i];
miwen[i+32]=L[16][i];
//逆密文
nimi[i]=miwen[nizhi[i]-1];
//密文2讲制显示
\n密文2进制显示"
if(i%8==0)printf("
nimi[i]);
//转换密文16进制
\n密文16进制显示\n"
k=0;
n=0x01;
z=0;
k=nimi[j*8+i]&
k<
<
z=z+k;
ab[j]=z;
ab[i]);
//原明文
\n原明文显示\n"
nimi[i]=b[nizhi[i]-1];
/*
=17;
printf("
if(i%7==0)printf("
L[j][i]);
R[j][i]);
}*/
//C与D显示
\nC与D显示\n"
for(i=1;
=16;
C[%d]\n"
i);
C[i-1][j]);
D[%d]\n"
D[i-1][j]);
//R与L显示
\nR与L显示\n"
L[%d]\n"
L[i][j]);
R[%d]\n"
R[i][j]);
while
(1);
解密
miyaohe[56]={57,49,41,33,25,17,9,
else{for(i=0;
{C[n][i]=C[n-1][(i+2)%28];
{miyao[i][
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- 语言 DES 加密 解密 算法