C语言实现 DES 出错
#include<stdio.h>int IP_Table[64] = { //IP置换矩阵
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 };
int E_Table[48] = { //扩展矩阵
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 };
int P_Table[32] = { // P 盒
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};
int IPR_Table[64] = { //逆IP置换矩阵
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 };
int PC1_Table[56] = { //密钥第一次置换矩阵
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 };
int PC2_Table[48] = { // 密钥第二次置换矩阵
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 };
int S_Box[8][4][16] = { //8个S盒 三维数组
// 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
};
static void CharToBit(const char input[],int output[],int bits)//把CHAR转换为INT
{
int i,j;
for(j=0;j<8;j++)
{
for(i=0;i<8;i++)
{
output[7*(j+1)-i+j] = (input[j] >> i) & 1 ;
}
}
};
static void BitToChar(const int intput[],char output[],int bits)//把INT转换为CHAR
{
int i,j;
for(j=0;j<8;j++)
{
for(i=0;i<8;i++)
{
output[j]=output[j]*2+intput[i+8*j];
}
}
};
static void Xor(int *INA,int *INB,int len)//异或操作
{
int i;
for(i=0;i<len;i++)
{
*INA=*INA^*INB;
INA++;
INB++;
}
};
static void IP(const int input[64],int output[64],int table[64])//初始IP置换
{
int i;
for(i=0;i<64;i++)
{
output[i]=input[table[i]-1];//减1操作不可少！！
}
};
static void E(const int input[32],int output[48],int table[48])//E扩展
{
int i;
for(i=0;i<48;i++)
{
output[i]=input[table[i]-1];
}
};
static void P(const int input[32],int output[32],int table[32])//P置换
{
int i;
for(i=0;i<32;i++)
{
output[i]=input[table[i]-1];
}
};
static void IP_In(const int input[64],int output[64],int table[64])//逆IP
{
int i;
for(i=0;i<64;i++)
{
output[i]=input[table[i]-1];
}
};
static void PC_1(const int input[64],int output[56],int table[56])//PC_1
{
int i;
for(i=0;i<56;i++)
{
output[i]=input[table[i]-1];
}
};
static void PC_2(const int input[56],int output[48],int table[48])//PC_2
{
int i;
for(i=0;i<48;i++)
{
output[i]=input[table[i]-1];
}
};
static void S(const int input[48],int output[32],int table[8][4][16])//S盒压缩
{
int i;
int j=0;
int INT[8];
for(i=0;i<48;i=i+6)
{
INT[j]=table[j][input[i]*2+input[i+5]][input[i+1]*8+input[i+2]*4+input[i+3]*2+input[i+4]];
j++;
}
for(j=0;j<8;j++)
{
for(i=0;i<4;i++)
{
output[3*(j+1)-i+j]=(INT[j]>>i)&1;
}
}
};
static void F_func(const int input[32],int output[32], int subkey[48])
{
int len=48;
int temp[48]={0};
int temp_1[32]={0};
E(input,temp,E_Table);
Xor(temp,subkey,len);
S(temp,temp_1,S_Box);
P(temp_1,output,P_Table);
};
static void RotateL(const int input[28],int output[28], int loop)//秘钥循环左移
{
int i;
if(loop==1)
{
int temp=input[0];
for(i=0;i<27;i++)
output[i]=input[i+1];
output[27]=temp;
}
else
{
int temp=input[0];
int temp_1=input[1];
for(i=0;i<25;i++)
output[i]=input[i+2];
output[26]=temp;
output[27]=temp_1;
}
};
static void subKey_fun(const int input[64],int Subkey[16][48])//子密钥生成
{
int loop=1,loop_2=2;
int i,j;
int c[28],d[28];
int pc_1[56];
int pc_2[16][56];
int rotatel_c[16][28];
int rotatel_d[16][28];
PC_1(input,pc_1,PC1_Table);
for(i=0;i<28;i++)
{
c[i]=pc_1[i];
d[i]=pc_1[i+28];
}
for(i=1;i<17;i++)
{
if(i==1||i==2||i==9||i==16)
{
RotateL(c,rotatel_c[i-1],loop);
RotateL(d,rotatel_d[i-1],loop);
}
else
{
RotateL(c,rotatel_c[i-1],loop_2);
RotateL(d,rotatel_d[i-1],loop_2);
}
}
for(i=0;i<16;i++)
{
for(j=0;j<28;j++)
{
pc_2[i][j]=rotatel_c[i][j];
pc_2[i][j+28]=rotatel_d[i][j];
}
}
for(i=0;i<16;i++)
{
PC_2(pc_2[i],Subkey[i],PC2_Table);
}
};
static void DES_Efun(char input[8],char key_in[8],int output[64])
{
int len=32;
int bits=8;
int i,j;
int r[16][32],l[16][32];
int chartobit[64],key[64];
int Subkey[16][48];
CharToBit(input,chartobit,bits);
CharToBit(key_in,key,bits);
for(i=0;i<32;i++)
{
r[0][i]=chartobit[i];
l[0][i]=chartobit[i+32];
}
subKey_fun(key,Subkey);
for(i=1;i<16;i++)
{
for(j=0;j<32;j++)
l[i][j]=r[i-1][j];
F_func(r[i-1],r[i], Subkey[i]);
Xor(r[i],l[i-1],len);
}
};
int main()
{
int output[64]={0};
char a[8]={'a','b','c','d','e','f','g','h'};
char b[8]={'a','b','c','d','e','f','g','h'};
DES_Efun(a,b,output);
/* for(int i=0;i<64;i++)
{
printf("%d",output[i]);
if((i+1)%4==0)
printf("\n");
}*/
return 0;
}
为什么b[8]出来了？不是最多b[7]嘛。
[ 本帖最后由 snnile2012 于 2014-6-16 15:50 编辑 ]
