ezRev

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WriteUp来源

来自Venom战队

题目描述

题目考点

解题思路

#include <iostream>
#include <stdlib.h>
#include <string.h>
 
using namespace std;
 
void xtea(int v[2], int  k[4]) {
    unsigned int v0 = v[0], v1 = v[1], j = 0x9E3779B9, sum = j * 32,i;
    for (i = 0; i < 32; i++) {
        v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
        sum -= j;
        v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
    }
    v[0] = v0; v[1] = v1;
    k[0] += 789;
    k[3] += 135;
}
int main() {
 
int z[4] = { 424242, 325477, 523007, 424242 };
int flag[8][2] = {
    0xD118C7B2,0x7FC3F3A8,0x4A19F2DA,0x472469E1,
    0x7C682864,0x50C0E3D1,0x0C595670B,0x2EE07578,
    0x0D040A3F0,0x0C5590286,0x0D82B07A8,0x0D5978C2C,
    0x4E2BC556,0x79E2E90,0x0C7A353B5,0x493995B
};
 
for (int i = 0; i < 8; i++) {
    xtea(flag[i], z);
    cout << (char)flag[i][0] << (char)flag[i][1];
}
system("pause");
return 0;
}

Flag

flag{42dDc75e1fE98cBCe842}