实验3 对称密码算法DES文档格式.docx
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#definePLAIN_FILE_OPEN_ERROR-1
#defineKEY_FILE_OPEN_ERROR-2
#defineCIPHER_FILE_OPEN_ERROR-3
#defineOK1
typedefcharElemType;
//初始置换表IP
intIP_Table[64]={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,
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};
//逆初始置换表IP^-1
intIP_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E32--->
48
intE_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
intP_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
intS[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
intPC_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
intPC_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
intMOVE_TIMES[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
intByteToBit（ElemTypech,ElemTypebit[8]）;
intBitToByte（ElemTypebit[8],ElemType*ch）;
intChar8ToBit64（ElemTypech[8],ElemTypebit[64]）;
intBit64ToChar8（ElemTypebit[64],ElemTypech[8]）;
intDES_MakeSubKeys（ElemTypekey[64],ElemTypesubKeys[16][48]）;
intDES_PC1_Transform（ElemTypekey[64],ElemTypetempbts[56]）;
intDES_PC2_Transform（ElemTypekey[56],ElemTypetempbts[48]）;
intDES_ROL（ElemTypedata[56],inttime）;
intDES_IP_Transform（ElemTypedata[64]）;
intDES_IP_1_Transform（ElemTypedata[64]）;
intDES_E_Transform（ElemTypedata[48]）;
intDES_P_Transform（ElemTypedata[32]）;
intDES_SBOX（ElemTypedata[48]）;
intDES_XOR（ElemTypeR[48],ElemTypeL[48],intcount）;
//异或操作
intDES_Swap（ElemTypeleft[32],ElemTyperight[32]）;
//交换L分组与R分组交换.
intDES_EncryptBlock（ElemTypeplainBlock[8],ElemTypesubKeys[16][48],ElemTypecipherBlock[8]）;
intDES_DecryptBlock（ElemTypecipherBlock[8],ElemTypesubKeys[16][48],ElemTypeplainBlock[8]）;
intDES_Encrypt（char*plainFile,char*keyStr,char*cipherFile）;
intDES_Decrypt（char*cipherFile,char*keyStr,char*plainFile）;
//字节转换成二进制
intByteToBit（ElemTypech,ElemTypebit[8]）{
intcnt;
for（cnt=0;
cnt<
8;
cnt++）{
*（bit+cnt）=（ch>
>
cnt）&
1;
//右移cnt位,与1相与.将字节装入8位二进制数组中.倒序装入
}//7=00000111,bit={11100000}
//printf（"
%s"
bit）;
return0;
}
//二进制转换成字节
intBitToByte（ElemTypebit[8],ElemType*ch）{
*ch|=*（bit+cnt）<
<
cnt;
//为*
（1）+*（10）+*（100）+0000+00000+0000000...=7
}
//将长度为8的字符串转为二进制位串
intChar8ToBit64（ElemTypech[8],ElemTypebit[64]）{
cnt<
ByteToBit（*（ch+cnt）,bit+（cnt<
3））;
//cnt<
3即为cnt*8
//将二进制位串转为长度为8的字符串
intBit64ToChar8（ElemTypebit[64],ElemTypech[8]）{
memset（ch,0,8）;
//以ch为起点的8位空间数组置0.
BitToByte（bit+（cnt<
3）,ch+cnt）;
//IP置换
intDES_IP_Transform（ElemTypedata[64]）{
ElemTypetemp[64];
64;
temp[cnt]=data[IP_Table[cnt]];
memcpy（data,temp,64）;
//由temp所指内存区域复制64个字节到data所指内存区域,与strcpy同.
//IP逆置换
intDES_IP_1_Transform（ElemTypedata[64]）{
temp[cnt]=data[IP_1_Table[cnt]];
//由temp所指内存区域复制64个字节到data所指内存区域,与strcpy同
}
//密钥置换1pc-1
intDES_PC1_Transform（ElemTypekey[64],ElemTypetempbts[56]）{
56;
tempbts[cnt]=key[PC_1[cnt]];
//密钥置换2pc-2
intDES_PC2_Transform（ElemTypekey[56],ElemTypetempbts[48]）{
48;
tempbts[cnt]=key[PC_2[cnt]];
//E扩展置换
intDES_E_Transform（ElemTypedata[48]）{//这里data两种用处,故为48位极人臣
ElemTypetemp[48];
temp[cnt]=data[E_Table[cnt]];
//这里data下标最高为32.
memcpy（data,temp,48）;
//P置换
intDES_P_Transform（ElemTypedata[32]）{
ElemTypetemp[32];
32;
temp[cnt]=data[P_Table[cnt]];
memcpy（data,temp,32）;
//循环左移
//左右两边同时循环左移相同的位数.
//10010循环左移1位为00101,左移2位为01010
intDES_ROL（ElemTypedata[56],inttimes）{
ElemTypetemp[56];
//temp只保存将要循环到右边的位.
//保存将要循环移动到右边的位
memcpy（temp,data,times）;
//保存前28位的移位
memcpy（temp+times,data+28,times）;
//保存后28位的移位极人臣
//前28位移动
memcpy（data,data+times,28-times）;
//一般移位
memcpy（data+28-times,temp,times）;
//循环位移动
//后28位移动
memcpy（data+28,data+28+times,28-times）;
memcpy（data+56-times,temp+times,times）;
//生成子密钥
intDES_MakeSubKeys（ElemTypekey[64],ElemTypesubKeys[16][48]）{
DES_PC1_Transform（key,temp）;
//PC1置换
16;
cnt++）{//16轮跌代，产生16个子密钥
DES_ROL（temp,MOVE_TIMES[cnt]）;
//CiDi左右两边,循环左移
DES_PC2_Transform（temp,subKeys[cnt]）;
//PC2置换，产生子密钥
//异或
intDES_XOR（ElemTypeR[48],ElemTypeL[48],intcount）{
count;
R[cnt]^=L[cnt];
//异或即为模2加法
//S盒置换48=8*632=8*4
intDES_SBOX（ElemTypedata[48]）{
intline,row,output;
intcur1,cur2;
cur1=cnt*6;
cur2=cnt<
2;
//计算在S盒中的行与列b1b2b3b4b5b6b1b2//b3b4b5b6
line=（data[cur1]<
1）+data[cur1+5];
row=（data[cur1+1]<
3）+（data[cur1+2]<
2）
+（data[cur1+3]<
1）+data[cur1+4];
output=S[cnt][line][row];
//化为2进制
data[cur2]=（output&
0X08）>
3;
//取得output二进制倒数第4位为0还是1
data[cur2+1]=（output&
0X04）>
//output=7=0111oxo4=0100
data[cur2+2]=（output&
0X02）>
//相&
得到0100右移2位得到1
data[cur2+3]=output&
0x01;
//交换L分组与R分组交换.
intDES_Swap（ElemTypeleft[32],ElemTyperight[32]）{
memcpy（temp,left,32）;
memcpy（left,right,32）;
memcpy（right,temp,32）;
//加密单个分组
intDES_EncryptBlock（ElemTypeplainBlock[8],ElemTypesubKeys[16][48],ElemTypecipherBlock[8]）{
ElemTypeplainBits[64];
//明文比特
ElemTypecopyRight[48];
Char8ToBit64（plainBlock,plainBits）;
//初始置换（IP置换）
DES_IP_Transform（plainBits）;
//16轮迭代
//将右半部分拷贝到数组中.
memcpy（copyRight,plainBits+32,32）;
//将右半部分进行扩展置换，从32位扩展到48位
DES_E_Transform（copyRight）;
//将右半部分与子密钥进行异或操作
DES_XOR（copyRight,subKeys[cnt],48）;
//异或结果进入S盒，输出32位结果
DES_SBOX（copyRight）;
//P置换
DES_P_Transform（copyRight）;
//将明文左半部分与右半部分进行异或
DES_XOR（plainBits,copyRight,32）;
if（cnt!
=15）{
//最终完成左右部的交换
DES_Swap（plainBits,plainBits+32）;
//逆初始置换（IP^1置换）
DES_IP_1_Transform（plainBits）;
Bit64ToChar8（plainBits,cipherBlock）;
//解密单个分组
intDES_DecryptBlock（ElemTypecipherBlock[8],ElemTypesubKeys[16][48],ElemTypeplainBlock[8]）{
ElemTypecipherBits[64];
Char8ToBit64（cipherBlock,cipherBits）;
DES_IP_Transform（cipherBits）;
for（cnt=15;
cnt>
=0;
cnt--）{
memcpy（copyRight,cipherBits+32,32）;
//这里为什么还是右半部分?
//将右半部分与子密钥进
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