刚布置的热乎作业，马上就写了。。
如果是正在做这个作业的同学搜到别抄，写得垃圾不要抄不要抄不要抄，
特别是吉大的同学，谢谢= =
1 #include<stdio.h>
2 #include<math.h>
3 #define N 128
4 #define index int
5
6
7 void FFunc(char *Result, char *R, char key,int len)
8 {
9 char temp=(Result[0]&0x00000001)^(key&0x00000001) ;
10 for(int i=1;i<len;i++)
11 Result[i]=R[i-1];
12 R[0]=temp;
13 }
14
15 bool compare(char*st1,char*st2,int len)
16 {
17 for(int i=0;i<len;i++)
18 if(st1!=st2) return 0;
19 }
20 void OrFunc(char* Result,char *A,char *B,int len)
21 {
22 for(index i=0;i<len;i++)
23 Result[i]=(A[i]&0x00000001)^(B[i]&0x00000001);
24 }
25
26
27 //复制 A[iA:iA+len-1]=B[iB:iB+len-1]
28 void strCopy(char *A, int iA, char *B, int iB, int len)
29 {
30 char*p = &A[iA], *q = &B[iB];
31 while(len--) *p++ = *q++;
32 }
33
34
35 void strOutput(char* str,int len)
36 {
37 for(int i=0;i<len;i++)
38 printf("%d",str[i]);
39 }
40
41 void Reverse(char* str1, char*str2,int len)
42 {
43 for(int i=0;i<len;i++)
44 str1[i]=str2[len-i-1];
45 }
46
47
48 void getLFSR_8(char *outString,index n)//生成n长M序列
49 {
50 char X[8] ={0,1,0,0,0,0,0,1};
51 for(index i=0;i<8;i++) outString[i]=X[i];
52 for(index i=8;i<n;i++)
53 {
54 outString[i] = X[7]^X[3]^X[0];
55 for(index j=7;j>0;j--)
56 X[j] = X[j-1];
57 X[0] = outString[i];
58 }
59 }
60
61
62 void getKey(char *key)//生成密钥
63 {
64 char temp[64];
65 getLFSR_8(temp,64);
66 for(index i=34,j=0;i<50;i++,j++)
67 {
68 key[j]=temp[i];
69 }
70 }
71
72
73 void tranStrToBit(int length, char* sStr, /*out*/char* sNum)
74 {
75 index iStr=0,iBit=0,k=0;
76 char cOut=0;
77
78 for(iStr=0; iStr+7<length; iStr+=8)
79 {
80 // 每八位转化成一个unsigned char
81 for(iBit=0; iBit<8; iBit++)
82 cOut |= sStr[iStr+iBit]<<(7-iBit);
83 sNum[k++] = cOut;
84 cOut = 0;
85 }
86 if(iStr==length) return;
87
88 //处理最后剩下的，不足则补全为0
89 cOut = 0;
90 for(iBit=0; iStr<length; iStr++,iBit++)
91 cOut |= sStr[iStr+iBit]<<(7-iBit);
92 }
93
94
95 void tranBitToStr(int codelength, char* sNum, /*out*/char* sStr)
96 {
97 index k=0;
98 int strLengtha = codelength/8.0;
99 index icoded=0;
100 unsigned char cTmp;
101 unsigned char flag=0x80;//10000000
102 while(k<strLengtha)
103 {
104 flag = 0x80;
105 cTmp = (unsigned char)sNum[k++];
106 for(index i=0; i<8; ++i,++icoded)
107 {
108 if(cTmp & flag)
109 sStr[icoded] = 1;
110 else sStr[icoded] = 0;
111 flag = flag >> 1;
112 }
113
114 }
115 }
116
117
118 void FeistailEncry(char* Result,int length,char* Key,char *Clear)
119 {
120 if(length%2 != 0) {printf("异常\n");return;}
121 int w = length/2;
122 char R[w], L[w];
123 char TempF[w];
124 char TempL[w];
125
126 strCopy(L, 0, Clear, 0, w);
127 strCopy(R, 0, Clear, w, w);
128 strOutput(L,w);strOutput(R,w);
129 for(int turn=1; turn<17; turn++)
130 {
131 strCopy(TempL,0,L,0,w);
132 strCopy(L, 0, R, 0, w);//L=Ri-1
133 FFunc(TempF, R, Key[turn-1],w);
134 OrFunc(R, TempL, TempF, w);
135 printf("\n第%d轮后:\n",turn);
136 strOutput(L,w);strOutput(R,w);
137 }
138 strCopy(Result,0,R,0,w);
139 strCopy(Result,w,L,0,w);
140 printf("\n输出为：\n");
141 strOutput(Result,length);
142 }
143
144
145
146 int main()
147 {
148 char sKey[16];
149 char sKey_16[2];
150 char sKey_reverse[16];
151 char sClearString[N];
152 char sClearString1[N];
153 char sCipherString[N];
154 char sCipherString1[N];
155 char sClearText[17];
156 char sCipherText[17];
157 char sClearText1[17];
158
159 getKey(sKey);
160 tranStrToBit(16,sKey,sKey_16);
161 printf("生成密钥为：\n\t");
162 for(int i=0;i<16;i++)
163 printf("%d",sKey[i]);
164
165 printf("\n请输入明文: \n\t");
166 scanf("%s",&sClearText);
167 printf("\n正在加密……\n");
168 tranBitToStr(N,sClearText,sClearString);
169 strOutput(sClearString,N);
170 FeistailEncry(sCipherString,N,sKey,sClearString);
171 printf("加密结果为：\n\t");
172 tranStrToBit(N,sCipherString,sCipherText);
173 sCipherText[17]=‘\n‘;
174 printf("%s",sCipherText);
175
176 getchar();
177 getchar();
178 printf("\n\n正在解密……\n");
179 tranBitToStr(N,sCipherText,sCipherString1);
180 FeistailEncry(sClearString1,N,sKey_reverse,sCipherString1);
181 tranStrToBit(N,sClearString1,sClearText1);
182 sClearText1[17]=‘\n‘;
183 printf("\n解密结果：\n\t%s\n",sClearText);
184 }
时间： 2024-10-07 07:06:49