C语言的DES和3DES算法能真正运行Word文件下载.docx
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二、实现环境及文件
a、环境：
RedhatLinux+c
b、实现文件：
des.h
des.c
makefile
三、代码
1、des.h文件
//功能：
实现DES及3DES加解密的算法
//作者：
XXX
//日期：
2008-9-23
#ifndefDES_H
#defineDES_H
staticintpc_1_table[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};
staticintpc_2_table[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};
staticintls_num_table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
staticintip_table[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};
staticintip_1_table[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};
staticinte_table[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};
staticintp_table[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};
staticints_box_table[8][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}},
{{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}},
{{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}},
{{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}},
{{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}},
{{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}},
{{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}},
{{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}}
};
//函数声明
intDo_DES（char*strSrc,char*strKey,char*strDest,charflag）;
#endif
2、des.c文件
#include<
stdio.h>
stdlib.h>
string.h>
#include"
des.h"
intDo_3DES（char*strSrc,char*strKey,char*strDest,charflag）;
//主函数
intmain（intargc,char**argv）
{
charsrc16[16+1],key16[16+1],key48[48+1],dest16[16+1];
if（argc!
=3）
{
fprintf（stderr,"
Usage:
[%s-e|-ds|3]\n"
argv[0]）;
exit
（1）;
}
if（strcmp（argv[2],"
-s"
）==0）
if（strcmp（argv[1],"
-e"
Pleaseinputthestringthatyouwanttoencrypt（16hexnumber）:
\n"
）;
memset（src16,0,sizeof（src16））;
scanf（"
%s"
src16）;
PleaseinputtheKeystring（16hexnumber）:
memset（key16,0,sizeof（key16））;
key16）;
memset（dest16,0,sizeof（dest16））;
Do_DES（src16,key16,dest16,'
e'
Result:
[%s]\n"
dest16）;
elseif（strcmp（argv[1],"
-d"
Pleaseinputthestringthatyouwanttodecrypt（16hexnumber）:
d'
else
return-1;
elseif（strcmp（argv[2],"
-3"
memset（key48,0,sizeof（key48））;
key48）;
Do_3DES（src16,key48,dest16,'
return-1;
return0;
}
//做DES加密或解密运算
intDo_DES（char*strSrc,char*strKey,char*strDest,charflag）
inti,j;
unsignedcharsubKey[16][48+1],byte8[8+1],bits[64+1],strTmp[64+1];
unsignedcharL0[32+1],R0[32+1],Lx[32+1],Rx[32+1];
if（!
（flag=='
||flag=='
E'
D'
））
if（strSrc==NULL||strKey==NULL）
return-2;
if（flag=='
）
memset（byte8,0,sizeof（byte8））;
BCDToByte（strKey,16,byte8）;
memset（bits,0,sizeof（bits））;
ByteToBit（byte8,8,bits）;
Des_GenSubKey（bits,subKey）;
BCDToByte（strSrc,16,byte8）;
Des_IP（bits,strTmp）;
memcpy（L0,strTmp,32）;
memcpy（R0,strTmp+32,32）;
for（i=0;
i<
16;
i++）
memcpy（Lx,R0,32）;
Des_F（R0,subKey[i],Rx）;
Do_XOR（L0,32,Rx）;
memcpy（L0,Lx,32）;
memcpy（R0,Rx,32）;
memcpy（bits,R0,32）;
memcpy（bits+32,L0,32）;
Des_IP_1（bits,strTmp）;
BitToByte（strTmp,64,byte8）;
ByteToBCD（byte8,8,strDest）;
Des_F（R0,subKey[15-i],Rx）;
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