cookie产生与认证

#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #define LEN 126 #define MINLIMIT 37 #define MAXLIMIT 126 #define GAP 89 #define SEM 61 int key[LEN] = {35, 51, 25, 10, 0, 38, 43, 51, 22, 17, 20, 50, 38, 32, 50, 41, 50, 39, 41, 31, 40, 50, 8, 44, 22, 50, 49, 2, 15, 2, 43, 51, 41, 17, 21, 19, 22, 49, 39, 42, 36, 16, 46, 49, 36, 11, 4, 51, 22, 39, 16, 16, 28, 6, 17, 10, 9, 32, 17, 50, 22, 5, 45, 15, 9, 52, 48, 21, 9, 47, 20, 17, 5, 36, 19, 0, 1, 29, 48, 23, 2, 37, 11, 31, 43, 39, 30, 52, 4, 3, 10, 12, 40, 25, 5, 51, 3, 17, 1, 8, 11, 39, 34, 36, 4, 16, 10, 3, 35, 32, 7, 37, 9, 50, 31, 0, 42, 42, 49, 27, 52, 28, 26, 30, 45, 17}; char* tTo(char **cookie) { int i = 0, j = 0; char *c = (char *)malloc(sizeof(char) * 2 * LEN); while(j < LEN) { c[i++] = cookie[j][0]; c[i++] = cookie[j++][1]; } return c; } char** oTt(char *cookie) { int i = 0, j = 0; char **c = (char **)malloc(sizeof(char *) * LEN); while(i < LEN) { c[i] = (char *)malloc(sizeof(char) * 2); c[i][0] = cookie[j++]; c[i++][1] = cookie[j++]; } return c; } int jiemi2(char *c, int b) { if(c[0] < SEM) c[0] += 4; if(c[1] < SEM) c[1] += 4; if(c[1] % 2 == 1) return c[0] - MINLIMIT + GAP + 1 - b; else return c[0] - MINLIMIT - b; } char** jiemi(char *c) { char **cookie = oTt(c); int i, index = 0; int nameLen = jiemi2(cookie[index], key[index]); index ++; int pwdLen = jiemi2(cookie[index], key[index]); index ++; char *name = (char *)malloc(sizeof(char) * nameLen); char *pwd = (char *)malloc(sizeof(char) * pwdLen); index = 26; for(i = 0;i < nameLen;i ++,index ++) name[i] = (char)jiemi2(cookie[index], key[index]); index = 76; for(i = 0;i < pwdLen;i ++,index ++) pwd[i] = (char)jiemi2(cookie[index], key[index]); char **result = (char **)malloc(sizeof(char *) * 2); result[0] = name; result[1] = pwd; return result; } char* jiami2(int a, int b) { int flag, rem, d; char *c = (char *)malloc(sizeof(char) * 2); d = (char)((a + b) % (GAP + 1) + MINLIMIT); if(d <= SEM) d -= 4; c[0] = (char)d; flag = ((a + b) >= (GAP + 1)); rem = rand() % GAP + MINLIMIT; if(rem % 2 != flag) rem++; if(rem <= SEM) rem -= 4; c[1] = (char)rem; return c; } char* jiami(char *name, char *pwd, char *t) { char **cookie = (char **)malloc(sizeof(char *) * LEN); int nameLen = strlen(name); int pwdLen = strlen(pwd); int i, index = 0; srand((unsigned)time(NULL)); cookie[index] = jiami2(nameLen, key[index]); index++; cookie[index] = jiami2(pwdLen, key[index]); index++; for(i = 0;i < 24;i++,index ++) cookie[index] = jiami2((int)t[0], key[index]); for(i = 0;i < nameLen;i ++,index ++) cookie[index] = jiami2((int)name[i], key[index]); for(i = 0;i < 50 - nameLen;i ++,index ++) cookie[index] = jiami2(rand() % 100, key[index]); for(i = 0;i < pwdLen;i ++,index ++) cookie[index] = jiami2((int)pwd[i], key[index]); for(i = 0;i < 50 - pwdLen;i ++,index ++) cookie[index] = jiami2(rand() % 100, key[index]); return tTo(cookie); } int main() { char *name = "Test"; char *pwd = "Test123"; char *t = "Sat Dec 12 23:02:35 2015"; char *cookie = jiami(name, pwd, t); printf("cookie = %s\n", cookie); char **result = jiemi(cookie); printf("name = %s, pwd = %s\n",result[0], result[1]); }