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软件学院密码学实验二DES.doc
School of Software, Yunnan University
云南大学软件学院
School of Software, Yunnan University
成绩
学
期:
2013 秋季学期
课程名称:
密码技术
任课教师:
学生姓名:
学
号:
实验项目:
联系电话:
电子邮件:
实验二
完成提交时间：2013 年 10 月 5 日
密码技术实验报告
实验项目：实验二，第二题
实验要求
（内容）
实验环境
实现功能
实现 DES 密码对任意文件的加解密（命令行方式）
Win7 32 位，Visual studio 2010（c 语言环境）
明文与密钥通过 DES 算法加密，密文与密钥通过 DES 算法解密。加解密形式为
cipher -e/-d key inputfile outputfile。对于加密来说，明文就是 inputfile，
密文就是 outputfile；对于解密来说，密文就是 inputfile，明文就是 outputfile。
Key 的长度必须为 8 个字节,否则会提示用户重新输入。另外，加解密形式不符合
要求时，会提示用户重新输入。达到题目要求。
//保存明文块、密文块、
char input[1024]={'\0'};//保存输入的加解密字符串
char inputfile[128]={'\0'};//保存输入文件路径名
char outputfile[128]={'\0'};//保存输出文件路径名
char plainBlock[8],cipherBlock[8],keyBlock[8];
密钥块
char bKey[64];
char subKeys[16][48]; //保存 16 组子密钥
//保存 64 位密钥中每位的 1、0 值
//初始置换表IP
int IP_Table[64] = {57,49,41,33,25,17,9,1,
数据结构
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7,
56,48,40,32,24,16,8,0,
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6};
//初始逆置换表P^-1
int IP_1_Table[64] = {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,
32,0,40,8,48,16,56,24};
//扩充置换表
int E_Table[48] =
{31,0,1,2,3,4,3,4,5,6,7,8,7,8,9,10,11,12,11,12,13,14,15,16,15,16,17,18
,19,20,19,20,21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0};
//置换函数P
int P_Table[32] = {15,6,19,20,28,11,27,16,
0,14,22,25,4,17,30,9,
1,7,23,13,31,26,2,8,
18,12,29,5,21,10,3,24};
//S盒
int S[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
int PC_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
int PC_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,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};
//对左移次数的规定
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
//此处画模块结构图，函数的调用关系，并指明每个函数的接口
程序流程
代 码 与 代
码分析
Function1:
Calls:
int main(int argc, char *argv[ ])
DES_Encrypt()
DES_Decrypt()
//主函数
Called By: 无
Input(type)：char input[1024]
Output(type):路径为 outputfile 的 txt 文档
Return(type):0
Function2:
*cipherFile)//加密文件
int
DES_Encrypt(char
*plainFile,
char
*keyStr,char
Calls:
Char8ToBit64(keyBlock,bKey);
DES_MakeSubKeys(bKey,subKeys);
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
main()
Called By:
Input(type)： char
plainFile[128]
char key[8]
Output(type): char
Return(type): OK
cipherFile[128]
Function3:
subKeys[16][48], char cipherBlock[8])//加密块函数
DES_EncryptBlock(char
int
plainBlock[8],
char
Calls:
Char8ToBit64(plainBlock,plainBits);
DES_IP_Transform(plainBits);
DES_E_Transform(copyRight);
DES_XOR(copyRight,subKeys[cnt],48);
DES_SBOX(copyRight);
DES_P_Transform(copyRight);
DES_Swap(plainBits,plainBits+32);
DES_IP_1_Transform(plainBits);
Bit64ToChar8(plainBits,cipherBlock);
Called By: DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile)
Input(type)： char plainBlock[8]
Output(type):
Return(type):
*/
char subKeys[16][48]
char cipherBlock[8]
0
Function4:
64 位
int
Char8ToBit64(plainBlock,plainBits); //8 位字符串转化为
Calls:
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
ByteToBit(*(ch+cnt),bit+(cnt<<3));
char cipherBlock[8])
Input(type)： char ch[8]
Output(type): char bit[64]
Return(type): 0
*/
Function5:
int DES_IP_Transform(char data[64])//初始置换IP
无
Calls:
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
char cipherBlock[8])
Input(type)： char data[64]
char data[64]
Output(type):
Return(type):
0
*/
Function6:int DES_E_Transform(char data[48]) //扩展置换（E表）
Calls: 无
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
char cipherBlock[8])
Input(type)： char copyRight [32]
Output(type):
Return(type):
char data[48]
0
*/
Function7:
int DES_XOR(char R[48], char L[48] ,int count) //XOR 异或
Calls:
Called By:DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
无
char cipherBlock[8])
Input(type)： char L[48]
int count
Output(type):char R[48]
Return(type): 0
*/
Function8: int DES_SBOX(char data[48])//替代选择S盒
Calls:
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
无
char cipherBlock[8])
Input(type)：int S[8][4][16]
Output(type): char data[48]
Return(type):
*/
0
Function9:
int DES_P_Transform(char data[32])//置换P
Calls:
Called
无
By:int
DES_EncryptBlock(char
plainBlock[8],
char
subKeys[16][48], char cipherBlock[8])
Input(type)： int P_Table[32]
Output(type):
Return(type):
*/
char data[32]
0
Function10:
交换
int DES_Swap(char left[32], char right[32])//左右32位互相
Calls:
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
无
char cipherBlock[8])
Input(type)：
Output(type):
Return(type):
char left[32]
char right[32]
char left[32]
char right[32]
0
*/
Function11: int DES_IP_1_Transform(char data[64])//逆初始置换IP-1
Calls:
Called By:DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
无
char cipherBlock[8])
Input(type)： int IP_1_Table[64]
Output(type):
Return(type):
*/
char data[64]
0
Function12:
int Bit64ToChar8(char bit[64],char ch[8])//64位转8位
无
Calls:
Called By: DES_EncryptBlock(char plainBlock[8], char subKeys[16][48],
char cipherBlock[8])
Input(type)： char bit[64]
Output(type):
Return(type):
*/
char ch[8]
0
Function13:
*plainFile)//解密文件
int
DES_Decrypt(char
*cipherFile,
char
*keyStr,char
Calls:
DES_DecryptBlock(cipherBlock,subKeys,plainBlock)
Char8ToBit64(keyBlock,bKey);
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