程序使用VS2008写的 从命令行读取文件Message.txt 然后将结果写到 coded.txt decoded.txt 运行时候需要填写命令行参数 并采用FAT32解决方案从命令行输入参数 这个你应该会吧？ 上面的三个文件名都要用命令行参数输入的~~~额。。。是我自己写的。。。
#include
#include
#include
#include
#define Decode 0
#define Encode 1
bool Sub_Key[16][48];
//明文初始置换
unsigned char Initial [] =
{
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
};
//最终置换
unsigned char Final[] =
{
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
};
//S-盒置换
unsigned char S_Box[8][64] =
{
/* 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}
};
unsigned char Key_Exchange[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
};
//压缩变换
unsigned char Compression[] =
{
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
};
//扩展变换
unsigned char Expansion[] =
{
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
};
//P_盒置换
unsigned char P_Box[]=
{
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
};
//密钥置换
unsigned char Key[]=
{
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
};
//
unsigned char Key_Move[]=
{
1 , 1 , 2 , 2 , 2 , 2 , 2 , 2 , 1 , 2 , 2 , 2 , 2 , 2 , 2 , 1
};
void Key_Process(char *);
void DES(char*,char *,int);
void Generate_SubKey(bool*,bool*);
void Rotate_Key(bool *,int);
void Initial_Exchange(char *, bool*,bool* );
void Exchange_Key(char *, bool*);
void Expand_Right(bool*, bool*);
void S_function(bool* ,bool* );
void P_function(bool * );
void Final_Exchange(bool* , bool*,char*);
void BitToByte(char *Out, const bool *In, int bits);
//主函数
int main(int argc,char**argv)
{
unsigned long start,end;
//time when execution begins
start = clock();
char Final_Result[12]={0};
char Message[12]={0};
char S_Key[8]={1,2,3,4,5,6,7,8};//64bits
//打开文件 用于输入
FILE *input = fopen( argv[1], "r");
if(ferror( input ))
return 0 ;
//创建文件 用于输出密文
FILE *encyption = fopen(argv[2],"w");
if(ferror( encyption ))
return 0 ;
//创建文件 用于输出解密后的明文
FILE *decyption = fopen(argv[3],"w");
if(ferror( decyption ))
return 0 ;
while( !feof(input) )
{
int i=0;
while( !feof(input) && i<8 )
{
Message[i]=fgetc(input);
i++;
}
if (i==0)
break ;
else if(i<8)
{
for(;i<8;i++)
Message[i]='\0';
}
Key_Process(S_Key);
DES(Message,Final_Result,Encode);
Final_Result[8]=0;
fputs( Final_Result, encyption );
memset(Message,0,8);
DES(Final_Result,Message,Decode);
Message[8]=0;
fputs( Message, decyption );
}
//time when execution ends
end = clock();
printf("The execution time is %ld ms\n", end-start );
return 0;
}
void Key_Process(char *S_Key)
{
int round ;
bool Bit_Key[56];//56bits
Exchange_Key(S_Key,Bit_Key);
for(round = 0 ;round<16;round++)
{
//KL->消息左28位，KR->消息右28位
bool*KL = &Bit_Key[0], *KR = &Bit_Key[28];
//循环左移
Rotate_Key(KL,Key_Move[round]);
Rotate_Key(KR,Key_Move[round]);
//产生子密钥
Generate_SubKey(Bit_Key,Sub_Key[round]);
}
}
void Exchange_Key(char *Key , bool* New_Key)
{
int i ,j;
bool Bit_Key[64];
//Transform the initial key to bool type
for(i = 0 ;i<8;i++)
for(j=0;j<8;j++)
{
Bit_Key[i*8+j] = (Key[i]>>j)&0x01;
}
for(i=0;i<56;i++)
New_Key[i]=Bit_Key[Key_Exchange[i]-1];
}
void Rotate_Key(bool*Key ,int round)
{
bool temp[64];
//void *memcpy( void *to, const void *from, size_t count );
//函数从from中复制count 个字符到to中，并返回to指针
memcpy(temp, Key, round);
memcpy(Key, Key+round, 28-round);
memcpy(Key+28-round, temp, round);
}
void Generate_SubKey(bool*Input, bool* Output)
{
for(int i=0;i<48;i++ )
{
Output[i]=Input[Compression[i]-1];
}
}
//DES函数
void DES( char*Message,char *Final_Result,int type)
{
bool Right[32];//32bits
bool Left[32];//32bits
bool Expanded_Right[48];//扩展后的右消息
bool flag[32];//用于左右消息交换
bool Result1[48];//48bits
bool Result2[32];//32bits
int round ,i;
Initial_Exchange(Message,Left,Right);
//加密算法
if(type == Encode)
{
for( round = 0 ; round < 16 ; round++ )
{
memcpy(flag,Right,32);
Expand_Right(Right,Expanded_Right);
for( i = 0 ; i<48 ; i++ )
Result1[i]=Expanded_Right[i]^Sub_Key[round][i];
S_function(Result1,Result2);
P_function(Result2);
for( i = 0 ; i<32 ; i++)
Right[i] = Result2[i]^Left[i];
memcpy(Left,flag,32);
}
}
//解密算法
else if(type == Decode)
{
for( round = 15 ; round >=0 ; round-- )
{
memcpy(flag,Left,32);
Expand_Right(Left,Expanded_Right);
for( i = 0 ; i<48 ; i++ )
Result1[i]=Expanded_Right[i]^Sub_Key[round][i];
S_function(Result1,Result2);
P_function(Result2);
for( i = 0 ; i<32 ; i++)
Left[i] = Result2[i]^Right[i];
memcpy(Right,flag,32);
}
}
Final_Exchange( Left , Right , Final_Result) ;
}
void Initial_Exchange(char *Message , bool*Left,bool*Right)
{
bool temp[64];
int i,j;
//把 Message 转化成 bit形式
for(i=0;i<8;i++)
for(j=0;j<8;j++)
temp[i*8+j]= (Message[i]>>j)&0x01;
for(i=0;i<32;i++)
Left[i]=temp[Initial[i]-1];
for(;i<64;i++)
Right[i-32]=temp[Initial[i]-1];
}
void Expand_Right(bool*Input , bool*Output)
{
for(int i =0;i<48;i++)
Output[i]=Input[Expansion[i]-1];
}
void S_function(bool* Input,bool*Output)
{
unsigned int x,y;
char z;
bool* in=Input;
bool* out=Output;
for(int j=0; j<8; j++,in+=6,out+=4)
{
//第1位和第6位
x = (in[0]<<1) + in[5];
//2-4位
y = (in[1]<<3) + (in[2]<<2) + (in[3]<<1) + in[4];
//由x y 确定的数z
z = S_Box[j][x*16+y];
//z用4个bit表示
for(int i=0; i<4; i++)
{
out[i] = (z>>i) & 1;
}
}
}
void P_function(bool* a)
{
bool temp[32];
memcpy(temp,a,32);
for(int i = 0 ;i<32;i++)
a[i]=temp[P_Box[i]-1];
}
void Final_Exchange(bool*left , bool*right ,char*result )
{
memset(result,0,8);
bool temp1[64];
//left 和 right 组合成 temp1
memcpy(temp1,left,32);
memcpy(temp1+32,right,32);
bool temp2[64];
for(int i=0;i<64;i++)
{
//由末置换得到temp2
temp2[i]=temp1[Final[i]-1];
//将temp2转化成char型
result[i/8] |= temp2[i]<<(i%8);
氏”的印高款。这就是信动，当数都是无什么的时天的时夫易被的，不过o。作室如制章的信
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