hgame 2022 re wp

1个月的hagme，时间还是比较长，但实际上做题的时间还是不长。

week3和week4的最后道re没做起，比较可惜，主要是没找到切入点，而且如果分析起来也很花费时间。

week1

easyasm

16位汇编，逻辑比较简单，就是单字节挨个加密，左4bit位和右4bit位交换位置，然后再异或0x17。

#include<stdio.h>

int main()
{
	unsigned char enc[29]={ 0x91, 0x61, 0x01, 0xC1, 0x41, 0xA0, 0x60, 0x41, 0xD1, 0x21, 
  0x14, 0xC1, 0x41, 0xE2, 0x50, 0xE1, 0xE2, 0x54, 0x20, 0xC1, 
  0xE2, 0x60, 0x14, 0x30, 0xD1, 0x51, 0xC0, 0x17};
  	int i;
  	
  	for(i=0;i<28;i++)
  	{
  		enc[i]=enc[i]^0x17;
  		enc[i]=((enc[i]<<4)|(enc[i]>>4));
  		printf("%c",enc[i]);
	  }
 }
//hgame{welc0me_to_4sm_w0rld} 

creakme

魔改tea加密，base64的表作为key，实际上用不完。

//flag{aaaaaaaaaaaaaaaaaaaaaaaaaa}
#include<stdio.h>

void encrypt(unsigned int *flag , unsigned int *key)
{
    unsigned int v0,v1,sum=0,i;
    unsigned int delta=0x12345678;
    v1=flag[0];
    v0=flag[1];
    for(i=0;i<32;i++)
    {
        sum += 0x12345678;
      v1 += sum ^ (sum + v0) ^ (key[2] + 16 * v0) ^ (key[3] + (v0 >> 5));
      v0 += sum ^ (sum + v1) ^ (key[0] + 16 * v1) ^ (key[1] + (v1 >> 5));
    }
    flag[0]=v1;
    flag[1]=v0;
}
void decrypt(unsigned int *code , unsigned int *key)
{
    unsigned int delta=0x12345678;
    unsigned int v0,v1,sum=delta*32,i;// sum=0xC6EF3720

    v1=code[0];
    v0=code[1];
    for(i=0;i<32;i++)
    {
    	v0 -= sum ^ (sum + v1) ^ (key[0] + 16 * v1) ^ (key[1] + (v1 >> 5));
        v1 -= sum ^ (sum + v0) ^ (key[2] + 16 * v0) ^ (key[3] + (v0 >> 5));
        sum-=delta;
    }
    code[0]=v1;
    code[1]=v0;
}

int main()
{
    unsigned int key[4]={0x44434241, 0x48474645, 0x4C4B4A49, 0x504F4E4D};
	unsigned int code[16]={0x48D93488, 0x030C144C, 0x52EB78C2, 0xED9CE5ED, 0xAE1FEDE6, 0xBA5A126D, 0xCF9284AA, 0x65E0F2E3, 
    0x7C836C08, 0xD1A971F3, 0xDBBF482D, 0x31ED1AE9, 0xDBBF482D, 0x31ED1AE9, 0xD6683289, 0x6EAD3693};
	int i;
    for(i=0;i<8;i++)
    {  	
    	decrypt(&code[i*2],key);  	
	}
	for(i=0;i<16;i++)
    {
    	//printf("%08x:",code[i]);
        printf("%c%c%c%c",*((char*)&code[i]+0),*((char*)&code[i]+1),*((char*)&code[i]+2),*((char*)&code[i]+3));
    }
}
#hgame{H4ppy_v4c4ti0n!} 

Flag Checker

安卓逆向，调用了加密库中rc4加密，找到key，用网站或者脚本解即可。

猫头鹰是不是猫

线性代数的矩阵乘法，调用了两次，都是6464的矩阵乘164的矩阵。其中i<<8的意思实际上就是在取行。

由于数据太多，z3无法使用，考虑用sage。

#https://sagecell.sagemath.org/

A=Matrix([[15, 14, 14, 13, 13, 14, 14, 13, 12, 10, 13, 21, 17, 14, 11, 10, 11, 16, 17, 8, 8, 7, 10, 12, 13, 12, 16, 18, 9, 6, 7, 8, 7, 8, 9, 8, 9, 10, 12, 12, 14, 16, 16, 14, 9, 4, 3, 5, 6, 6, 6, 3, 4, 6, 6, 5, 5, 5, 5, 4, 5, 7, 5, 4], [15, 15, 14, 13, 13, 14, 14, 13, 12, 11, 21, 15, 15, 14, 11, 10, 8, 8, 10, 8, 8, 7, 9, 11, 11, 11, 19, 13, 12, 5, 6, 7, 7, 8, 9, 9, 10, 12, 15, 17, 17, 17, 16, 10, 4, 4, 5, 6, 7, 7, 6, 4, 5, 7, 6, 6, 5, 5, 4, 3, 5, 6, 4, 3], [15, 15, 14, 13, 13, 14, 14, 13, 12, 19, 15, 13, 15, 14, 12, 10, 8, 8, 9, 8, 8, 7, 9, 10, 9, 16, 14, 8, 17, 5, 6, 9, 16, 17, 17, 18, 18, 19, 21, 22, 22, 21, 19, 10, 4, 5, 6, 7, 9, 9, 6, 5, 8, 8, 6, 6, 5, 4, 4, 3, 3, 4, 3, 3], [15, 15, 14, 14, 13, 14, 14, 14, 14, 19, 12, 13, 14, 14, 13, 12, 10, 9, 9, 9, 8, 7, 9, 10, 12, 18, 10, 8, 18, 6, 6, 7, 7, 6, 7, 8, 9, 12, 15, 20, 14, 10, 5, 4, 5, 6, 7, 9, 10, 10, 7, 7, 9, 9, 7, 6, 6, 5, 6, 6, 6, 6, 5, 5], [15, 14, 14, 13, 13, 14, 14, 14, 15, 18, 11, 12, 13, 14, 14, 14, 12, 11, 11, 11, 10, 10, 11, 14, 23, 18, 18, 18, 20, 12, 7, 7, 7, 6, 6, 8, 10, 13, 14, 20, 11, 6, 4, 5, 6, 7, 9, 10, 11, 10, 7, 9, 11, 9, 7, 6, 6, 6, 7, 7, 7, 7, 7, 6], [15, 15, 14, 14, 13, 14, 15, 14, 12, 20, 8, 8, 11, 14, 14, 14, 13, 17, 22, 15, 12, 12, 14, 22, 14, 13, 12, 9, 8, 19, 7, 7, 7, 6, 6, 7, 9, 12, 13, 20, 10, 7, 6, 6, 8, 9, 10, 12, 12, 10, 9, 11, 11, 10, 8, 7, 7, 7, 7, 8, 7, 7, 7, 6], [15, 14, 14, 14, 13, 14, 15, 13, 7, 10, 16, 4, 5, 12, 15, 19, 22, 19, 13, 12, 12, 13, 22, 15, 13, 13, 12, 9, 7, 17, 11, 8, 7, 6, 5, 6, 9, 12, 13, 20, 11, 10, 8, 8, 9, 11, 11, 13, 12, 10, 11, 12, 11, 11, 9, 8, 7, 7, 8, 8, 8, 7, 7, 6], [14, 14, 14, 14, 13, 13, 14, 11, 3, 2, 9, 17, 18, 19, 19, 18, 13, 12, 12, 12, 12, 16, 18, 13, 13, 13, 11, 9, 8, 14, 13, 7, 8, 6, 5, 6, 9, 11, 12, 20, 12, 11, 10, 10, 11, 12, 12, 13, 12, 11, 12, 13, 12, 11, 10, 8, 8, 8, 8, 8, 8, 7, 7, 6], [14, 14, 14, 14, 13, 13, 14, 7, 2, 4, 4, 4, 4, 3, 3, 9, 10, 10, 11, 11, 12, 12, 12, 12, 12, 12, 11, 8, 7, 5, 4, 6, 7, 6, 5, 5, 8, 10, 11, 20, 13, 12, 11, 11, 12, 13, 13, 13, 13, 12, 13, 13, 13, 12, 10, 9, 8, 8, 8, 8, 8, 7, 7, 6], [15, 14, 14, 14, 13, 13, 13, 3, 4, 5, 5, 5, 4, 3, 3, 3, 7, 9, 11, 12, 13, 12, 13, 12, 12, 11, 9, 7, 5, 5, 5, 5, 4, 3, 3, 3, 3, 4, 7, 11, 11, 12, 12, 12, 13, 13, 14, 13, 13, 13, 13, 14, 13, 12, 11, 9, 8, 8, 8, 8, 8, 7, 6, 5], [15, 15, 14, 14, 13, 13, 11, 3, 5, 6, 6, 4, 4, 3, 3, 3, 3, 9, 13, 13, 13, 12, 10, 11, 9, 8, 7, 5, 4, 3, 3, 2, 2, 1, 1, 1, 1, 2, 2, 4, 7, 10, 11, 13, 14, 13, 14, 14, 13, 14, 14, 13, 13, 12, 11, 10, 9, 8, 8, 8, 8, 7, 6, 5], [15, 15, 14, 14, 13, 13, 9, 3, 5, 6, 5, 5, 4, 4, 3, 2, 2, 4, 11, 12, 10, 8, 7, 5, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 2, 2, 3, 4, 4, 5, 9, 13, 13, 14, 13, 14, 13, 13, 13, 13, 12, 11, 9, 9, 8, 8, 8, 8, 7, 5, 6], [15, 14, 14, 14, 13, 13, 7, 4, 6, 6, 5, 4, 4, 3, 3, 2, 2, 2, 4, 9, 9, 5, 3, 2, 2, 2, 2, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 2, 2, 5, 5, 3, 2, 2, 6, 12, 13, 13, 13, 14, 14, 13, 12, 11, 9, 8, 7, 7, 7, 7, 8, 7, 5, 6], [15, 14, 14, 14, 13, 12, 4, 5, 7, 6, 5, 4, 4, 3, 3, 2, 2, 2, 3, 4, 4, 2, 2, 2, 2, 2, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2, 4, 6, 6, 3, 2, 2, 2, 5, 9, 12, 14, 14, 12, 8, 6, 5, 5, 6, 7, 6, 6, 6, 7, 6, 5, 6], [15, 14, 14, 14, 13, 11, 4, 5, 7, 6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 4, 7, 9, 10, 9, 7, 4, 2, 4, 4, 4, 4, 3, 2, 2, 2, 2, 4, 4, 4, 4, 4, 3, 3, 4, 5, 9, 12, 10, 4, 3, 4, 3, 3, 4, 6, 6, 7, 8, 7, 5, 4, 6], [15, 14, 14, 14, 13, 10, 3, 5, 7, 6, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 7, 13, 13, 12, 13, 18, 14, 10, 5, 1, 4, 4, 4, 5, 5, 4, 3, 2, 4, 4, 3, 4, 5, 6, 5, 6, 6, 5, 6, 5, 4, 4, 5, 4, 4, 3, 5, 7, 8, 9, 6, 3, 2, 3], [14, 14, 14, 14, 13, 9, 4, 6, 7, 7, 5, 5, 4, 3, 3, 3, 3, 3, 2, 8, 16, 17, 15, 10, 7, 9, 15, 13, 11, 5, 2, 3, 6, 6, 7, 4, 2, 2, 3, 1, 0, 1, 4, 3, 5, 4, 5, 6, 4, 3, 4, 4, 4, 5, 4, 3, 5, 9, 10, 10, 6, 3, 2, 2], [14, 14, 14, 13, 13, 7, 4, 5, 7, 7, 6, 5, 4, 4, 4, 4, 3, 3, 6, 16, 18, 17, 6, 4, 2, 3, 3, 13, 14, 9, 3, 3, 3, 5, 4, 2, 2, 1, 1, 0, 0, 0, 3, 2, 4, 1, 1, 3, 2, 2, 4, 5, 6, 5, 5, 4, 4, 9, 10, 8, 5, 2, 2, 3], [14, 14, 14, 13, 13, 6, 6, 5, 7, 7, 7, 6, 5, 4, 4, 4, 4, 5, 9, 17, 19, 16, 5, 3, 2, 2, 2, 10, 13, 11, 4, 3, 3, 1, 2, 2, 1, 0, 0, 0, 0, 1, 3, 1, 3, 0, 1, 3, 6, 7, 5, 4, 4, 5, 5, 5, 4, 11, 10, 7, 4, 3, 3, 5], [14, 14, 13, 13, 13, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 3, 3, 4, 6, 8, 12, 11, 6, 2, 2, 2, 2, 2, 4, 3, 1, 1, 2, 3, 2, 3, 2, 1, 1, 1, 2, 2, 2, 1, 2, 1, 0, 3, 12, 16, 15, 10, 6, 4, 5, 5, 4, 12, 12, 10, 8, 6, 6, 8], [14, 13, 13, 13, 12, 6, 6, 7, 6, 6, 6, 5, 4, 3, 3, 3, 3, 3, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 3, 2, 2, 2, 2, 3, 2, 2, 2, 2, 4, 1, 2, 6, 11, 17, 17, 11, 8, 5, 5, 4, 11, 13, 11, 11, 9, 8, 9], [14, 13, 13, 13, 12, 5, 4, 7, 6, 6, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 2, 3, 3, 3, 3, 2, 1, 1, 2, 3, 3, 2, 3, 3, 3, 4, 4, 4, 4, 11, 16, 14, 8, 5, 4, 10, 11, 11, 12, 11, 9, 8], [13, 13, 13, 13, 10, 2, 3, 5, 6, 6, 4, 3, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 3, 2, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 3, 3, 2, 3, 2, 3, 4, 5, 5, 4, 2, 14, 17, 14, 5, 4, 9, 10, 10, 11, 11, 9, 9], [12, 12, 12, 12, 10, 4, 3, 3, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 2, 3, 5, 3, 2, 3, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 1, 1, 2, 3, 5, 5, 5, 11, 19, 17, 6, 5, 11, 12, 11, 11, 11, 10, 10], [12, 12, 12, 12, 9, 5, 4, 2, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 2, 2, 2, 4, 3, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 3, 1, 1, 2, 3, 3, 2, 3, 4, 5, 6, 8, 17, 19, 7, 5, 12, 12, 12, 11, 11, 11, 11], [11, 11, 11, 11, 9, 3, 3, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 1, 0, 1, 2, 3, 4, 3, 3, 3, 4, 5, 5, 7, 12, 6, 5, 11, 11, 11, 11, 11, 11, 11], [12, 12, 13, 12, 9, 2, 2, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 3, 3, 2, 2, 1, 2, 2, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 3, 3, 5, 10, 11, 11, 11, 12, 12], [13, 13, 13, 14, 12, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 0, 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 4, 5, 8, 10, 11, 12, 8, 5, 3, 2, 2, 3, 2, 2, 3, 4, 4, 3, 2, 2, 2, 4, 11, 12, 12, 12, 13], [14, 14, 14, 14, 14, 13, 3, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 0, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 2, 2, 1, 3, 10, 13, 14, 14, 15, 15, 17, 16, 14, 12, 11, 8, 3, 2, 2, 2, 3, 3, 3, 2, 2, 2, 3, 10, 12, 12, 13, 13], [14, 14, 15, 15, 14, 13, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 0, 1, 1, 1, 1, 2, 9, 12, 17, 18, 17, 16, 15, 17, 17, 16, 16, 15, 16, 15, 4, 2, 2, 2, 3, 3, 3, 2, 2, 3, 10, 13, 13, 13, 14], [15, 15, 15, 15, 15, 13, 4, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 2, 8, 12, 18, 19, 17, 15, 17, 18, 18, 18, 18, 17, 15, 4, 2, 2, 2, 2, 3, 2, 2, 2, 3, 10, 14, 14, 14, 14], [16, 15, 15, 15, 14, 11, 2, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 2, 9, 12, 14, 16, 14, 17, 16, 16, 17, 15, 13, 10, 1, 2, 1, 2, 2, 2, 3, 2, 1, 3, 11, 13, 13, 14, 15], [16, 15, 15, 15, 14, 7, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 3, 9, 11, 12, 13, 13, 12, 12, 12, 12, 10, 3, 2, 1, 1, 1, 1, 1, 2, 2, 2, 4, 13, 15, 14, 14, 15], [16, 15, 15, 15, 12, 4, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 2, 2, 6, 9, 11, 10, 11, 11, 10, 9, 4, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 4, 12, 14, 15, 15, 16], [17, 16, 15, 16, 16, 3, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 0, 2, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 2, 1, 2, 4, 6, 6, 5, 3, 1, 0, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 4, 13, 14, 13, 15, 16], [16, 18, 19, 19, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 2, 0, 0, 0, 0, 0, 0, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 14, 15, 15, 15, 15], [19, 19, 19, 19, 19, 12, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 2, 1, 0, 0, 0, 0, 1, 1, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 6, 12, 16, 16, 16, 16], [19, 19, 19, 19, 19, 16, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 2, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 8, 17, 15, 16, 18, 18], [19, 20, 20, 20, 20, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 12, 18, 20, 18, 17, 20], [19, 20, 20, 20, 19, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 12, 20, 20, 20, 20, 18], [19, 19, 20, 19, 19, 18, 10, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 2, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 2, 5, 16, 17, 20, 20, 21, 21], [18, 18, 18, 19, 19, 18, 12, 2, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 9, 18, 19, 18, 21, 20, 21], [13, 14, 15, 15, 17, 18, 15, 4, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 2, 14, 20, 19, 20, 19, 21, 20], [9, 12, 12, 9, 11, 16, 14, 6, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 3, 16, 21, 21, 19, 20, 18, 21], [10, 10, 10, 10, 12, 13, 13, 7, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 10, 17, 20, 21, 20, 19, 20, 19], [11, 12, 14, 14, 16, 17, 13, 8, 2, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 15, 20, 19, 20, 21, 20, 20, 20], [17, 18, 17, 19, 20, 19, 18, 12, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 6, 19, 20, 19, 20, 20, 21, 20, 21], [19, 18, 20, 20, 20, 20, 19, 13, 3, 1, 2, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 15, 20, 21, 20, 19, 21, 21, 22, 20], [19, 19, 20, 20, 20, 19, 18, 14, 3, 2, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 5, 20, 21, 21, 21, 19, 21, 22, 22, 21], [20, 20, 20, 20, 19, 19, 18, 13, 3, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 21, 21, 21, 21, 21, 19, 22, 22, 22], [20, 20, 20, 20, 19, 19, 17, 9, 2, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 14, 22, 22, 22, 22, 21, 20, 22, 22, 22], [19, 20, 20, 20, 20, 18, 13, 4, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 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3, 2, 7, 7, 1, 4, 11, 6, 1, 3, 8, 8, 8, 10, 8, 3, 2, 4, 7, 6, 10, 5, 10, 16, 21, 20, 17, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15], [13, 13, 17, 18, 16, 11, 18, 18, 16, 13, 9, 7, 7, 2, 5, 7, 4, 2, 5, 10, 7, 1, 10, 9, 2, 1, 5, 8, 8, 10, 7, 2, 2, 4, 9, 6, 9, 6, 9, 18, 23, 21, 14, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15], [13, 13, 17, 18, 16, 14, 22, 19, 16, 10, 8, 8, 4, 2, 5, 7, 7, 4, 3, 9, 13, 10, 6, 11, 5, 0, 3, 8, 10, 10, 4, 1, 1, 6, 5, 6, 9, 11, 10, 17, 22, 17, 13, 13, 13, 13, 14, 14, 14, 14, 20, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15], [13, 13, 18, 19, 17, 14, 19, 12, 12, 10, 10, 6, 4, 4, 7, 8, 8, 5, 2, 8, 11, 11, 9, 12, 9, 3, 3, 8, 10, 6, 3, 1, 3, 5, 2, 8, 11, 10, 13, 14, 18, 15, 13, 13, 13, 13, 13, 14, 14, 14, 20, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15], [13, 13, 16, 19, 18, 16, 17, 9, 11, 11, 9, 6, 7, 7, 8, 8, 6, 5, 1, 5, 10, 10, 8, 6, 7, 5, 4, 8, 7, 2, 3, 3, 3, 3, 4, 7, 10, 10, 13, 13, 14, 13, 13, 13, 13, 13, 13, 13, 14, 17, 18, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15], [13, 13, 15, 20, 19, 15, 18, 11, 12, 10, 9, 4, 7, 6, 7, 7, 6, 4, 2, 3, 7, 10, 10, 7, 7, 4, 7, 7, 3, 3, 3, 3, 3, 5, 6, 9, 9, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 19, 15, 14, 14, 14, 14, 15, 14, 15, 15, 15, 15, 15, 15, 15], [13, 13, 13, 19, 20, 14, 17, 14, 13, 11, 10, 4, 7, 4, 6, 6, 7, 5, 3, 4, 5, 8, 10, 10, 5, 1, 5, 2, 1, 3, 4, 2, 4, 7, 9, 8, 13, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 13, 21, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15], [13, 13, 13, 14, 15, 13, 17, 17, 13, 13, 10, 3, 6, 5, 7, 6, 5, 4, 4, 3, 5, 5, 7, 10, 9, 5, 4, 3, 4, 3, 1, 3, 8, 13, 9, 8, 15, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 21, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 14, 14, 14, 15], [13, 13, 13, 13, 13, 13, 14, 18, 12, 8, 9, 3, 6, 6, 8, 8, 5, 2, 3, 2, 2, 6, 8, 7, 6, 6, 5, 3, 1, 2, 3, 8, 13, 11, 7, 16, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 17, 18, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15], [13, 13, 13, 13, 13, 13, 13, 16, 11, 5, 7, 5, 6, 6, 7, 7, 8, 3, 1, 4, 4, 4, 6, 9, 8, 6, 6, 4, 1, 3, 8, 10, 7, 8, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 19, 16, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 18], [13, 13, 12, 13, 13, 13, 13, 13, 12, 8, 7, 9, 6, 3, 4, 6, 8, 7, 2, 2, 7, 7, 7, 7, 7, 6, 5, 3, 0, 4, 6, 3, 6, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 21, 14, 14, 14, 16, 14, 14, 14, 14, 14, 14, 14, 14, 15, 19, 20], [13, 12, 13, 13, 13, 13, 13, 13, 12, 11, 10, 9, 10, 5, 1, 2, 3, 7, 5, 2, 3, 6, 6, 6, 6, 5, 3, 1, 2, 3, 3, 5, 9, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 21, 14, 14, 14, 21, 14, 14, 14, 16, 18, 20, 18, 15, 18, 21, 21], [13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 14, 14, 12, 10, 2, 3, 2, 2, 3, 4, 4, 4, 5, 5, 4, 3, 2, 2, 1, 1, 2, 6, 10, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 21, 14, 14, 16, 20, 16, 22, 23, 22, 23, 23, 24, 23, 20, 24, 22], [13, 12, 13, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 11, 9, 8, 5, 4, 2, 4, 5, 7, 8, 9, 8, 8, 5, 3, 2, 2, 6, 4, 11, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 20, 15, 13, 21, 15, 14, 19, 22, 23, 23, 24, 24, 24, 24, 24, 21], [13, 12, 12, 13, 13, 12, 13, 13, 13, 13, 13, 15, 15, 14, 9, 7, 6, 2, 3, 7, 9, 10, 11, 11, 10, 10, 8, 4, 3, 2, 4, 5, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 20, 17, 19, 13, 15, 20, 21, 22, 22, 22, 19, 23, 24, 24, 24], [13, 13, 12, 13, 13, 12, 13, 13, 13, 13, 13, 13, 13, 13, 10, 6, 3, 2, 7, 8, 10, 11, 12, 12, 12, 13, 13, 5, 3, 2, 3, 8, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 17, 20, 14, 13, 14, 18, 19, 20, 20, 21, 20, 20, 21, 22, 20], [13, 13, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 6, 6, 6, 10, 11, 11, 12, 13, 14, 15, 16, 16, 8, 6, 4, 5, 9, 11, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 14, 13, 14, 15, 14, 15, 15, 17, 18, 19, 19, 19, 19, 19, 20, 20, 19], [13, 12, 13, 13, 13, 12, 12, 13, 13, 13, 13, 13, 13, 14, 12, 9, 8, 10, 10, 12, 14, 14, 16, 18, 19, 19, 18, 13, 10, 10, 7, 9, 15, 19, 17, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 18, 17, 19, 19, 19, 19, 15, 16, 14, 13, 19, 18, 18, 18, 13, 16, 17], [13, 12, 13, 13, 13, 12, 13, 13, 13, 13, 13, 13, 13, 13, 18, 16, 12, 11, 16, 16, 17, 18, 20, 20, 22, 20, 18, 16, 13, 13, 12, 8, 9, 14, 19, 18, 17, 19, 18, 14, 13, 14, 15, 14, 14, 18, 17, 17, 17, 17, 17, 17, 16, 16, 13, 13, 13, 12, 14, 15, 16, 17, 17, 18], [12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 21, 18, 13, 11, 17, 19, 20, 21, 20, 18, 19, 18, 14, 14, 13, 13, 13, 9, 7, 12, 18, 18, 16, 16, 19, 20, 17, 16, 16, 18, 17, 15, 14, 13, 12, 13, 14, 13, 12, 10, 10, 9, 12, 16, 16, 18, 19, 18, 18, 19], [12, 12, 12, 12, 13, 12, 12, 13, 13, 13, 13, 13, 13, 17, 21, 20, 16, 13, 14, 14, 16, 16, 16, 16, 14, 15, 13, 13, 13, 13, 13, 12, 7, 10, 14, 20, 13, 14, 16, 20, 20, 17, 16, 12, 14, 11, 14, 15, 10, 11, 13, 10, 8, 9, 9, 8, 14, 19, 19, 18, 18, 18, 18, 19], [12, 12, 12, 13, 12, 13, 13, 13, 13, 13, 13, 13, 15, 22, 22, 20, 15, 13, 13, 10, 9, 9, 10, 11, 11, 9, 10, 13, 12, 11, 10, 10, 9, 10, 9, 19, 17, 8, 8, 15, 21, 16, 11, 10, 10, 12, 10, 9, 8, 11, 8, 8, 6, 9, 13, 9, 9, 12, 16, 18, 17, 16, 18, 20], [13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 15, 20, 22, 22, 22, 22, 16, 12, 8, 8, 6, 6, 8, 7, 7, 6, 7, 10, 8, 9, 8, 11, 9, 8, 6, 12, 16, 10, 6, 11, 15, 14, 10, 12, 11, 11, 11, 9, 7, 9, 8, 11, 10, 8, 7, 8, 9, 18, 20, 20, 19, 19, 17, 19]])

encode=Matrix([0x025D15D4, 0x024C73B4, 0x0243CF71, 0x0230134C, 0x02132CFE, 0x01BE2FCA, 0x0142CA26, 0x00D61955,
    0x009427A8, 0x009B8674, 0x0090C832, 0x008812C7, 0x0080BA58, 0x007981E1, 0x0072AB68, 0x0074CB4B,
    0x00723F3F, 0x007CC258, 0x0089CD5C, 0x0088E2A2, 0x008E8906, 0x008B88A0, 0x008EEC8D, 0x008F3573,
    0x008B746F, 0x00912C82, 0x008D7CF2, 0x00832099, 0x007F45A5, 0x00685AFF, 0x0050A4D2, 0x00526FE2,
    0x0058923B, 0x00529EC1, 0x00516D1A, 0x005B7453, 0x007028E6, 0x0089C6FA, 0x00A5D6AE, 0x00D37A14,
    0x00B8CFAA, 0x00B0BB4B, 0x00AE69A4, 0x00A1154B, 0x009DCBE7, 0x00A1DC20, 0x00AA07E3, 0x00B25CB1,
    0x00B2FD98, 0x00B12F29, 0x00E428A0, 0x011B2184, 0x01615722, 0x01A502F3, 0x01C0AA9D, 0x01D4169F,
    0x01EF8B76, 0x0233E5BB, 0x0275A6F0, 0x02A9CA35, 0x02A8904C, 0x02A194EF, 0x02926F39, 0x028E92C3])
temp=encode*A.inverse()
flag=temp*B.inverse()

flag=[bytes(i).decode() for i in flag]
print(''.join(flag))

但是好像现在网站不支持在线测试代码了。所以可能需要配环境。

week2

xD MAZE

走迷宫，但是走的方式不一样，可以打印出地图慢慢走，或者写个dfs脚本。

改了下之前的一个脚本。

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  0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
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  0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
  0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
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  0x23, 0x23, 0x23, 0x23, 0x23, 0x20]
#print(chr(map[65]))
# for i in range(len(map)):
#     #print(i,end=':')
#     print(chr(map[i]),end=' ')
#     if ((i + 1) % 64 == 0):
#         print(end='\n')

path=[]
mark=[0]*4096

def dfs(index):
    global path
    newindex = 0

    if(index==4095):
        for i in path:
            print(i,end='')
        exit(0)

    way='0'
    newindex=index+512
    if(newindex<4096 and map[newindex]==ord(' ') and mark[newindex]==0  ):
        path.append('0')
        mark[newindex]=1
        dfs(newindex)
        mark[index]=0
        path.pop(len(path))

    way = '1'
    newindex = index + 64
    if (newindex<4096 and map[newindex] == ord(' ') and mark[newindex] == 0 ):
        path.append('1')
        mark[newindex] = 1
        dfs(newindex)
        mark[index] = 0
        path.pop(len(path))

    way = '2'
    newindex = index + 8
    if (newindex<4096 and map[newindex] == ord(' ') and mark[newindex] == 0):
        path.append('2')
        mark[newindex] = 1
        dfs(newindex)
        mark[index] = 0
        path.pop(len(path))

    way = '3'
    newindex = index + 1
    if (newindex<4096 and map[newindex] == ord(' ') and mark[newindex] == 0):
        path.append('3')
        mark[newindex] = 1
        dfs(newindex)
        mark[index] = 0
        path.pop(len(path))

dfs(0)
#3120113031203203222231003011

upx magic 0

和upx没关系，单字节加密，复制ida中的算法，然后爆破即可。

flag=''
enc = [0x8d68, 0x9d49, 0x2a12, 0xab1a, 0xcbdc, 0xb92b, 0x2e32, 0x9f59, 0xddcd, 0x9d49, 0xa90a, 0xe70, 0xf5cf, 0xa50,
       0x5af5, 0xff9f, 0x9f59, 0xbd0b, 0x58e5, 0x3823, 0xbf1b, 0x78a7, 0xab1a, 0x48c4, 0xa90a, 0x2c22, 0x9f59, 0x5cc5,
       0x5ed5, 0x78a7, 0x2672, 0x5695]

for i in range(32):
  for f in range(0,127):
      temp = f << 8
      for j in range(8):
          if ((temp & 0x8000) != 0):
              temp = (2 * temp) ^ 0x1021
          else:
              temp *= 2
      #print(hex(temp))
      if(enc[i]== temp&0xffff):
        flag+=chr(f)
print(flag)
#noW_YOu~koNw-UPx~mAG|C_@Nd~crC16

fake shell

一个假的shell，实际上就是一些打印函数，在sudo后，会输入flag，然后进行check。但是需要注意的是有一个linux下的反调试。

在执行main函数前是先会执行init里面的代码，然后这里面可以加入自己的代码，这道题就是加了一个检查进程运行状态的反调试。https://blog.csdn.net/qq_39387233/article/details/117186430

修改了后面rc4加密的key。

加密函数在sub_176C，rc4加密。用网站解，或者获得异或值就行。

xor=[  0xBF, 0x91, 0xF8, 0x86, 0x3D, 0x42, 0xA6, 0xB8, 0xEE, 0x00,
  0xCD, 0x62, 0xC4, 0x6C, 0x95, 0xC8, 0x18, 0x0F, 0x5D, 0x5A,
  0xD2, 0xAD, 0x7E, 0x25, 0x77, 0x5E, 0x55, 0x8B, 0xF2, 0xE7,
  0xF9, 0xBD]
Fflag=b'abcdefghijklmnopqrstuvwxyz123456'
enc=[    0xB6, 0x94, 0xFA, 0x8F, 0x3D, 0x5F, 0xB2, 0xE0, 0xEA, 0x0F,
  0xD2, 0x66, 0x98, 0x6C, 0x9D, 0xE7, 0x1B, 0x08, 0x40, 0x71,
  0xC5, 0xBE, 0x6F, 0x6D, 0x7C, 0x7B, 0x09, 0x8D, 0xA8, 0xBD,
  0xF3, 0xF6]

for i in range(32):
    print(chr(enc[i]^Fflag[i]^xor[i]),end='')
#hgame{s0meth1ng_run_bef0r_m4in?}

creakme2

考点c++的seh异常处理，这个题的主逻辑是一个xtea加密，但是加密的sum会因为seh的关系在32次的某几次被二次修改。

f5看不了seh，需要看汇编。

所以就是对sum多加了一个判断。

if(sum>>0x1f==0)
   {
   	sum^=0x1234567;
}  

解密脚本。

#include<stdio.h> 
//abcdefghijklmnopqrstuvwxyz123456
//75AF0A92 2E15816F
void encrypt(unsigned int r ,unsigned int *flag ,unsigned int *key)
{
    unsigned int v0,v1,i;
    int sum=0;
    unsigned int delta=0x9E3779B1;
    v0=flag[0];
    v1=flag[1];
    for(i=0;i<r;i++) 
    {
        v0+=( ((v1<<4) ^ (v1>>5)) +v1 ) ^ ( sum + key[sum&3] );
        sum+=delta;
        if(sum>>0x1f==0)
        {
        	sum^=0x1234567;
		}    
        v1+=( ((v0<<4) ^(v0>>5)) +v0 ) ^ ( sum + key[ (sum>>11)&3 ]);
    }
    printf("%x\n",sum);
    flag[0]=v0;
    flag[1]=v1;


}

void decrypt(unsigned int r ,unsigned int *code ,unsigned int *key)
{
    unsigned int v0,v1,i,delta=0x9E3779B1;
    int sum=0x0C78E4D05;

    v0=code[0];
    v1=code[1];
    for(i=0;i<r;i++)
    {
        v1-=( ((v0<<4) ^(v0>>5)) +v0 ) ^ ( sum + key[ (sum>>11)&3 ]);
        if(sum>>0x1f==0)
        {
        	sum^=0x1234567;
		} 
        sum-=delta;
        v0-=( ((v1<<4) ^ (v1>>5)) +v1 ) ^ ( sum + key[sum&3] );
    }
    code[0]=v0;
    code[1]=v1;
}

#include<stdio.h>

int main()
{
    unsigned int key[4]={1,2,3,4};
    unsigned int r=32,i;
    unsigned int code[8]={0x457E62CF,0x9537896C,0x1F7E7F72,0xF7A073D8,0x8E996868,0x40AFAF99,0xF990E34, 0x196F4086};
    unsigned int flag[2]={0x64636261,0x68676665};
    

//	encrypt(r,flag,key);
//	printf("%08x %08x\n",flag[0],flag[1]);
	
	for(i=0;i<4;i++)
	{
		decrypt(r,&code[i*2],key);
	}

    for(i=0;i<8;i++)
    {
        printf("%c%c%c%c",*((char*)&code[i]+0),*((char*)&code[i]+1),*((char*)&code[i]+2),*((char*)&code[i]+3));
    }
}
//hgame{SEH_s0und5_50_1ntere5ting}

upx magic1

调试就完事了，慢慢调，找到加密的地方，和upx magic 0的加密完全一样，只是密文多了几个字节。

v4=[0]*37
v4[0] = 0x8D68
v4[1] = 40265
v4[2] = 10770
v4[3] = 43802
v4[4] = 52188
v4[5] = 47403
v4[6] = 11826
v4[7] = 40793
v4[8] = 56781
v4[9] = 40265
v4[10] = 43274
v4[11] = 3696
v4[12] = 62927
v4[13] = 24277
v4[14] = 15363
v4[15] = 31879
v4[16] = 9842
v4[17] = 43802
v4[18] = 2640
v4[19] = 23285
v4[20] = 65439
v4[21] = 40793
v4[22] = 48395
v4[23] = 22757
v4[24] = 14371
v4[25] = 48923
v4[26] = 30887
v4[27] = 43802
v4[28] = 18628
v4[29] = 43274
v4[30] = 11298
v4[31] = 40793
v4[32] = 0x5CC5
v4[33] = 0x5ED5
v4[34] = 0x78A7
v4[35] = 0x2672
v4[36] = 0x5695
for i in v4:
  print(hex(i),end=',')
flag=''
enc=[0x8d68,0x9d49,0x2a12,0xab1a,0xcbdc,0xb92b,0x2e32,0x9f59,0xddcd,0x9d49,0xa90a,0xe70,0xf5cf,0x5ed5,0x3c03,0x7c87,0x2672,0xab1a,0xa50,0x5af5,0xff9f,0x9f59,0xbd0b,0x58e5,0x3823,0xbf1b,0x78a7,0xab1a,0x48c4,0xa90a,0x2c22,0x9f59,0x5cc5,0x5ed5,0x78a7,0x2672,0x5695]
for i in range(37):
  for f in range(0,127):
      temp = f << 8
      for j in range(8):
          if ((temp & 0x8000) != 0):
              temp = (2 * temp) ^ 0x1021
          else:
              temp *= 2
      #print(hex(temp))
      if(enc[i]== temp&0xffff):
        flag+=chr(f)
print(flag)
#noW_YOu~koNw-rea1_UPx~mAG|C_@Nd~crC16

Week3

这周的最后一题由于没使用findcrypt插件导致没解出来，也是第一次接触到blowfish加密吧。

Answer’s Windows

用窗口实现了一个伪windows登录界面，实际上就是一个输入check和加载变换的图片。而且程序体量还比较大，估计使用了什么框架来编写的这个窗口吧。

也是有一个简单的反调试。

通过字符串定位，可以很快知道密文的位置，从而知道加密函数大概在哪。

enc=";'>B<76\\=82@-8.@=T\"@-7ZU:8*F=X2J<G>@=W^@-8.@9D2T:49U@1aa"

table=[0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A,
  0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,
  0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E,
  0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
  0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52,
  0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C,
  0x5D, 0x5E, 0x5F, 0x60,0x61]

import base64

base = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
ans = ''

for i in enc:
	ans += base[table.index(ord(i))]
print(ans)
print(base64.b64decode(ans))
#hgame{qt_1s_s0_1nteresting_so_1s_b4se64}

creakme3

PowerPc，升级版的ida7.5可以f5。

来看看代码。

int __cdecl main(int argc, const char **argv, const char **envp)
{
  int i; // [sp+1Ch] [-184h]
  int j; // [sp+20h] [-180h]
  int k; // [sp+24h] [-17Ch]
  _BYTE v7[372]; // [sp+28h] [-178h] BYREF

  memset(v7, 0, 0x164u);
  printf("Welcome my whitegive re task! This is your flag: ");
  do
  {
    for ( i = 0; i <= 88; ++i )
      *(_DWORD *)&v7[4 * i] = rand() % 89;
    for ( j = 1; j <= 88 && a[2 * *(_DWORD *)&v7[4 * j] + 1] >= a[2 * *(_DWORD *)&v7[4 * j - 4] + 1]; ++j )
      ;
  }
  while ( j != 89 );
  for ( k = 0; k <= 88; ++k )
    putchar(a[2 * *(_DWORD *)&v7[4 * k]]);
  return 0;
}

可以看到就是rand()产生了长度为89的数组作为a数组的index，使其满足些条件，通过看代码和看数据可知，a数组是分奇，偶位操作的。偶数位为单字节字符，奇数位为双字节数据，奇数位的数据需要配合rand产生的数据去满足一些大小判断，测试下[5，2，7，3]，实际上就可以得到满足的数据为[2,0,3,1]，所以实际上就是大小排序的index。

脚本如下。

#include<stdio.h>
unsigned int a[178] = {
    0x30, 0x4E7D, 0x30, 0x67BD, 0x30, 0x7A48, 0x30, 0x82A2, 0x30, 0x933E, 0x31, 0x9C18, 0x32, 0x5AFF, 0x32, 0x6CD7, 0x32, 0xA6CA, 0x32, 0xBD79, 0x32, 0xCEBD, 0x33, 0x324A, 0x33, 0x3292, 0x33, 0x3905, 0x33, 0x4291, 0x33, 0x5ADE, 0x33,
0x6E9F, 0x33, 0xA52A, 0x33, 0xBE35, 0x33, 0xCB63, 0x35, 0x7F3B, 0x38, 0x3914, 0x38, 0xB2AD, 0x39, 0x38DA, 0x39, 0x4E50, 0x39, 0x6A02, 0x39, 0xB10F, 0x42, 0x78E5, 0x5F, 0x7EF6, 0x5F, 0x89A3, 0x5F, 0x8EBD, 0x5F, 0x95E3, 0x61, 0x73DA,
0x64, 0x538C, 0x64, 0x633B, 0x64, 0x9E9C, 0x64, 0xB78B, 0x64, 0xC866, 0x65, 0x32AE, 0x65, 0x7679, 0x66, 0x2AE7, 0x66, 0x4D6A, 0x66, 0x5708, 0x66, 0x6610, 0x66, 0xA258, 0x66, 0xB80C, 0x66, 0xC885, 0x67, 0x710A, 0x67, 0x7CF4, 0x68,
0x3F76, 0x68, 0x702B, 0x68, 0xA3EE, 0x68, 0xAD50, 0x68, 0xBAC7, 0x69, 0x4024, 0x69, 0x8A22, 0x69, 0xC055, 0x6A, 0x2B52, 0x6A, 0xC687, 0x6B, 0x5F00, 0x6B, 0xC417, 0x6C, 0x6182, 0x6D, 0x75DB, 0x6E, 0x3C61, 0x6E, 0x4996, 0x6E, 0x5DC1,
0x6F, 0x2D76, 0x6F, 0x7D17, 0x6F, 0xA91B, 0x70, 0x9AED, 0x72, 0x45D0, 0x72, 0x8467, 0x72, 0xAB5D, 0x73, 0x5083, 0x73, 0x6222, 0x73, 0x8D93, 0x73, 0x923A, 0x73, 0x971E, 0x73, 0xB4BA, 0x73, 0xC785, 0x74, 0x3558, 0x74, 0x86BD, 0x74,
0x9738, 0x75, 0x3710, 0x75, 0x9779, 0x77, 0x2F3F, 0x77, 0x44DD, 0x7B, 0x78E1, 0x7D, 0x9F42
};

unsigned int index[]={40, 57, 66, 85, 11, 12, 38, 80, 83, 23, 13, 21, 63, 49, 54, 14, 86, 70, 64, 41, 24, 0, 73, 33, 42, 15, 6, 65,
	         59, 61, 74, 34, 43, 1, 25, 7, 16, 50, 47, 32, 62, 39, 87, 27, 2, 48, 67, 28, 20, 3, 71, 81, 29, 55, 75, 30, 76,
	         4, 31, 77, 82, 84, 69, 5, 35, 88, 44, 51, 17, 8, 68, 72, 52, 26, 22, 78, 36, 45, 53, 9, 18, 56, 60, 58, 79, 37,
	         46, 19, 10};
int main()
{
	int i;
	
	for(i=0;i<89;i++)
	{
		printf("%c",a[index[i]*2]);
	}
}
//fjow33etu938nhi3wrnf90sdf32nklsdf0923hgame{B0go_50rt_is_s0_stup1d}fh32orh98sdfh23ikjsdf32

t = [0x4e7d, 0x67bd, 0x7a48, 0x82a2, 0x933e, 0x9c18, 0x5aff, 0x6cd7, 0xa6ca, 0xbd79, 0xcebd, 0x324a, 0x3292, 0x3905,
     0x4291, 0x5ade, 0x6e9f, 0xa52a, 0xbe35, 0xcb63, 0x7f3b, 0x3914, 0xb2ad, 0x38da, 0x4e50, 0x6a02, 0xb10f, 0x78e5,
     0x7ef6, 0x89a3, 0x8ebd, 0x95e3, 0x73da, 0x538c, 0x633b, 0x9e9c, 0xb78b, 0xc866, 0x32ae, 0x7679, 0x2ae7, 0x4d6a,
     0x5708, 0x6610, 0xa258, 0xb80c, 0xc885, 0x710a, 0x7cf4, 0x3f76, 0x702b, 0xa3ee, 0xad50, 0xbac7, 0x4024, 0x8a22,
     0xc055, 0x2b52, 0xc687, 0x5f00, 0xc417, 0x6182, 0x75db, 0x3c61, 0x4996, 0x5dc1, 0x2d76, 0x7d17, 0xa91b, 0x9aed,
     0x45d0, 0x8467, 0xab5d, 0x5083, 0x6222, 0x8d93, 0x923a, 0x971e, 0xb4ba, 0xc785, 0x3558, 0x86bd, 0x9738, 0x3710,
     0x9779, 0x2f3f, 0x44dd, 0x78e1, 0x9f42]

t2 = sorted(t)

for i in t2:
    print(t.index(i), end=',')

flag = [0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x32, 0x32, 0x32, 0x32, 0x32, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0x33, 0x33, 0x35, 0x38, 0x38, 0x39, 0x39, 0x39, 0x39, 0x42, 0x5f, 0x5f, 0x5f, 0x5f, 0x61, 0x64, 0x64, 0x64,
        0x64, 0x64, 0x65, 0x65, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x67, 0x67, 0x68, 0x68, 0x68, 0x68, 0x68,
        0x69, 0x69, 0x69, 0x6a, 0x6a, 0x6b, 0x6b, 0x6c, 0x6d, 0x6e, 0x6e, 0x6e, 0x6f, 0x6f, 0x6f, 0x70, 0x72, 0x72,
        0x72, 0x73, 0x73, 0x73, 0x73, 0x73, 0x73, 0x73, 0x74, 0x74, 0x74, 0x75, 0x75, 0x77, 0x77, 0x7b, 0x7d]
index = [40, 57, 66, 85, 11, 12, 38, 80, 83, 23, 13, 21, 63, 49, 54, 14, 86, 70, 64, 41, 24, 0, 73, 33, 42, 15, 6, 65,
         59, 61, 74, 34, 43, 1, 25, 7, 16, 50, 47, 32, 62, 39, 87, 27, 2, 48, 67, 28, 20, 3, 71, 81, 29, 55, 75, 30, 76,
         4, 31, 77, 82, 84, 69, 5, 35, 88, 44, 51, 17, 8, 68, 72, 52, 26, 22, 78, 36, 45, 53, 9, 18, 56, 60, 58, 79, 37,
         46, 19, 10, ]
for i in range(len(flag)):
    print(chr(flag[index[i]]), end='')

hardened

安卓逆向，但是用了梆梆加固，需要脱壳，这里我是使用了https://github.com/CodingGay/BlackDex这个github项目提供的软件来脱壳。

脱完壳后。在jeb里面分析代码。

enc.so的aesEncryption函数和bbbb函数

我们对basetable进行交叉引用，发现了这里datadiv_decode9820009342035880852，对key，iv，和base表都进行了处理。

enc=[  0x79, 0x78, 0x7B, 0x7A, 0x7D, 0x7C, 0x7F, 0x7E, 0x71, 0x70,
  0x08, 0x0B, 0x0A, 0x0D, 0x0C, 0x0F, 0x0E, 0x01, 0x00, 0x03,
  0x02, 0x05, 0x04, 0x07, 0x06, 0x19, 0x18, 0x1B, 0x1A, 0x1D,
  0x1C, 0x1F, 0x1E, 0x11, 0x10, 0x13, 0x28, 0x2B, 0x2A, 0x2D,
  0x2C, 0x2F, 0x2E, 0x21, 0x20, 0x23, 0x22, 0x25, 0x24, 0x27,
  0x26, 0x39, 0x38, 0x3B, 0x3A, 0x3D, 0x3C, 0x3F, 0x3E, 0x31,
  0x30, 0x33, 0x62, 0x66]
for i in enc:
    print(chr(i^0x49),end='')
print('\n')
enc2=[  0x7A, 0x65, 0x63, 0x64, 0x6F, 0x71, 0x6F, 0x7E, 0x7F, 0x62,
  0x7D, 0x71, 0x7C, 0x6F, 0x7B, 0x75, 0x69, 0x6F, 0x76, 0x7F,
  0x62, 0x6F, 0x69, 0x7F, 0x65, 0x6F, 0x64, 0x7F, 0x6F, 0x74,
  0x75, 0x73]
for i in enc2:
    print(chr(i^0x30),end='')
print('\n')
enc3=[  0x06, 0x10, 0x0A, 0x20, 0x19, 0x16, 0x11, 0x1B, 0x20, 0x12,
  0x1A, 0x5E, 0x5E, 0x5E, 0x5E, 0x5E]
for i in enc3:
    print(chr(i^0x7f),end='')

# 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/
#
# JUST_A_NORMAL_KEY_FOR_YOU_TO_DEC
#
# you_find_me!!!!!

#https://gchq.github.io/CyberChef/
#mXYxnHYp61u/5qksdDel6TgiKqcvUbBkX3xErlR4lO0aEAdU0acJY8PRSVXJxxsRR8Dq9MTJhkWLSbBvCG5gtm==
#hgame{cONGraTUl4T|0N5!N0w_yoU_C4n_eN?Oy~thE~MUsIc}

fishman

看了很多文章，都没找到合适的，然后尝试运行，也报错，没考虑到python版本的问题，也没使用findcrypt插件去搜索算法，没认出是blowfish算法，后面就没管了。

看了wp，发现是blowfish后，网上找了个写好的代码，找到key跑一下就直接出了。https://www.cnblogs.com/iBinary/p/14883752.html

#include "BlowFish.h"
#include <string.h>
#include<stdio.h>
using namespace std;
bool BlowFishInit(BLOWFISH_CTX* blowCtx, unsigned char * key, unsigned int keylen)
{
    //设置传入的CTX中的SBOX值
    for (int Row = 0; Row < 4; Row++)
    {
        for (int Col = 0; Col < 256; Col++)
        {
            blowCtx->sbox[Row][Col] = ORIG_S[Row][Col];
        }
    }

    /*
    设置pbox
    1.循环18轮
    2.每轮都设置ctx.pbox值与data ^
    3.data = *(DWORD*)key[0] key[1]..... 
    */
    int KeyIndex = 0;
    for (int index = 0; index < N + 2; index++)
    {
        unsigned int data = 0;
        //填充data 将key的字符设置到data当中
        for (int k = 0; k < 4; k++)
        {
            //通过移位设置每个字符
            data = (data << 8) | key[KeyIndex];
            KeyIndex++;
            //如果超出了key长度 那么key要从开始
            if (KeyIndex >= keylen)
                KeyIndex = 0;
        }
        //否则不满足
        blowCtx->pbox[index] = ORIG_P[index] ^ data;
    }

    //对一个64位0 进行加密。加密结果的输出设置到pbox[i]与pbox[i+1]中
    unsigned int Data1 = 0;
    unsigned int Data2 = 0;
    for (int i = 0; i < N + 2; i+=2)
    {
        BlowFish_Encry(blowCtx, &Data1, &Data2);
        blowCtx->pbox[i] = Data1;
        blowCtx->pbox[i+1] = Data2;
    }
    //初始化Sbox
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 256; j += 2)
        {
            BlowFish_Encry(blowCtx, &Data1, &Data2);
            blowCtx->sbox[i][j] = Data1;
            blowCtx->sbox[i][j + 1] = Data2;
        }
    }
    return true;
}

//unsigned int F(PBLOWFISH_CTX blowCtx, unsigned int Data)
//{
//
//    unsigned int a, b, c, d;
//    /*
//    利用位运算 取出下标值
//    */
//    
//   a = (Data  >> 24) & 0xFF;
//   b = (Data >> 16) & 0xFF;
//   c = (Data >> 8) & 0xFf;
//   d = Data & 0xFF;
//   
//
//    int TempValue = blowCtx->sbox[0][a] + blowCtx->sbox[1][b];
//    TempValue = TempValue ^ blowCtx->sbox[2][c];
//    TempValue = TempValue + blowCtx->sbox[3][d];
//    //公式 ((a+b)^c)+d
//    return TempValue;
//}
static unsigned long F(BLOWFISH_CTX* ctx, unsigned long x) {
    unsigned short a, b, c, d;
    unsigned long  y;

   /* d = (unsigned short)(x & 0xFF);
    x >>= 8;
    c = (unsigned short)(x & 0xFF);
    x >>= 8;
    b = (unsigned short)(x & 0xFF);
    x >>= 8;
    a = (unsigned short)(x & 0xFF);

    //都可以使用
    */
    a = (x >> 24) & 0xFF;
    b = (x >> 16) & 0xFF;
    c = (x >> 8) & 0xFf;
    d = x & 0xFF;
    
    y = ctx->sbox[0][a] + ctx->sbox[1][b];
    y = y ^ ctx->sbox[2][c];
    y = y + ctx->sbox[3][d];

    return y;
}

void BlowFish_Encry(PBLOWFISH_CTX blowCtx, unsigned int* left, unsigned int* right)
{
    unsigned long  Xl;
    unsigned long  Xr;
    unsigned long  temp;
    short       i;

    //加密部分首先将其分为left跟right两组。 每一组分别32位
    Xl = *left;
    Xr = *right;

    for (i = 0; i < N; ++i) {
        Xl = Xl ^ blowCtx->pbox[i];
        Xr = F(blowCtx, Xl) ^ Xr;

        temp = Xl;
        Xl = Xr;						//交换左右的值。 l = R r= l 继续下一轮循环。总共16轮
        Xr = temp;
    }

    temp = Xl;
    Xl = Xr;                          //16轮完毕之后交换变量
    Xr = temp;

    Xr = Xr ^ blowCtx->pbox[N];              //最后进行一次疑或
    Xl = Xl ^ blowCtx->pbox[N + 1];

    *left = Xl;
    *right = Xr;


}

void BlowFish_Decrypt(PBLOWFISH_CTX blowCtx, unsigned int* left, unsigned int* right)
{
    unsigned int Xl = *left;
    unsigned int Xr = *right;

    //倒着循环
    for (int i = N + 1; i > 1; --i)
    {
        Xl = Xl ^ blowCtx->pbox[i];
        Xr = Xr ^ F(blowCtx, Xl);
        
        //继续左右交换
        unsigned int temp = Xl;
        Xl = Xr;
        Xr = temp;
    }

    //最后一轮继续交换
    unsigned int temp = Xl;
    Xl = Xr;
    Xr = temp;

    //返还原
    Xr = Xr ^ blowCtx->pbox[1];
    Xl = Xl ^ blowCtx->pbox[0];

    //设置变量返回
    *left = Xl;
    *right = Xr;
}

int main()
{
    unsigned int L =0x546F4EBF , R = 0xB4ED937B;
    unsigned char enc[]={  0xBF, 0x4E, 0x6F, 0x54, 0x7B, 0x93, 0xED, 0xB4, 0x7E, 0xA0, 
  0xD2, 0x82, 0xDD, 0xEF, 0xD3, 0x13, 0x0F, 0xAE, 0x09, 0x22, 
  0x61, 0xDF, 0x4E, 0x59, 0x2C, 0x78, 0x33, 0xB9, 0x32, 0xE5, 
  0x07, 0x1C,0x00};
    BLOWFISH_CTX ctx;
    BlowFishInit(&ctx,(unsigned char*)"LET_U_D",strlen("LET_U_D"));
    //BlowFish_Encry(&ctx, &L, &R);
    for(int i=0;i<4;i++)
    {
    	BlowFish_Decrypt(&ctx, (unsigned int*)(enc+i*8), (unsigned int*)(enc+i*8+4));
	}
    printf("%s",enc);
    
}
//hgame{D0_y0u_re411V_11k3_9Vthon} 

后来发现不能运行是因为需要python3.9。这样就可以在ida中打断点调试了，需要把fishman.cp39-win_amd64.pyd放在python3.9的site-packages下。能调试了当然就方便多了。

week4

WOW

考点des加密，设计的比较巧妙，des应该是魔改过的，而且表都没魔改过，但是估计修改了加密逻辑。

题目设置了text节区可写是有原因的，里面有两个函数会修改text节区的代码，然后正好后面有个这个des的自解密，但是text的代码被修改后，就执行不到后面的自解密函数了。所以需要绕一下。

动调解密即可。

server

之前写过tcp最基本的tcp通讯，所以还是没什么难度。

go语言逆向，可以看出是一个服务器，之前一直在找输入的地方，后来分析了一些函数，发现是个http服务器，并且通过get方式传参，没尝试过post行不行。

可以看到main，main函数，先是在本地创建了个9090的监听端口。

然后重点看http处理函数。先是提取出请求参数flag的值，然后加密，然后比较。

然后就是rsa的加密了，主要是使用了bigmath，处理大数，https://studygolang.com/articles/20366，然后最后有两轮数组内异或。反解需要爆破第二轮异或的值。

rsa的p，q，e，均可调试得到，而且在看数据时最好看汇编界面，因为f5出来的效果不是太好，注意p，q传入的math_big___ptr_Int__SetString长度。

脚本

table = [0] * 153
a=0x30
for t in range(0x30, 0x45):
    a = t
    enc = [99, 85, 4, 3, 5, 5, 5, 3, 7, 7, 2, 8, 8, 11, 1, 2, 10, 4, 2, 13, 8, 9, 12, 9, 4, 13, 8, 0, 14, 0, 15, 13, 14,
           10,
           2, 2, 1, 7, 3, 5, 6, 4, 6, 7, 6, 2, 2, 5, 3, 3, 9, 6, 0, 11, 13, 11, 0, 2, 3, 8, 3, 11, 7, 1, 11, 5, 14, 5,
           0,
           10, 14, 15, 13, 7, 13, 7, 14, 1, 15, 1, 11, 5, 6, 2, 12, 6, 10, 4, 1, 7, 4, 2, 6, 3, 6, 12, 5, 12, 3, 12, 6,
           0,
           4, 15, 2, 14, 7, 0, 14, 14, 12, 4, 3, 4, 2, 0, 0, 2, 6, 2, 3, 6, 4, 4, 4, 7, 1, 2, 3, 9, 2, 12, 8, 1, 12, 3,
           12,
           2, 0, 3, 14, 3, 14, 12, 9, 1, 7, 15, 5, 7, 2, 2, 4]
    for i in range(153):
        enc[i] = a ^ enc[i]
        a = enc[i]
    a = 0x66
    for i in range(153):
        enc[i] = enc[i] ^ a
        a = enc[i]
    print('\n')
    for i in enc:
        print(chr(i), end='')

print('\n')

#flag1='135005562109829034199059149474896341566307600227148289525068532297727897409776873250963225670468340868270979975367474527115512003915945795967599087720024'

#flag2='034015463119928024098049048464997351467317701237049299424078433287626887508766972240862235771478241878371969874377575537014502102905844785866589186730125'

import gmpy2
from Crypto.Util.number import long_to_bytes

def Decrypt(c, e, p, q):
    L = (p - 1) * (q - 1)
    d = gmpy2.invert(e, L)
    n = p * q
    m = gmpy2.powmod(c, d, n)
    print(long_to_bytes(m))

if __name__ == '__main__':
    p = 107310528658039985708896636559112400334262005367649176746429531274300859498993
    q = 92582184765240663364795767694262273105045150785272129481762171937885924776597
    e = 950501
    c = 135005562109829034199059149474896341566307600227148289525068532297727897409776873250963225670468340868270979975367474527115512003915945795967599087720024
    Decrypt(c, e, p, q)

#https://studygolang.com/articles/20366

ezvm

vm虚拟机，调试就行，看完所有函数，发现就两个地方设计到计算，sub_40178C和sub_40177D。

调试发现，开始都是将输入的flag读取到vm结构体的后面，然后就开始单字节计算，在上面两个函数打个断点，发现是先进行sub_40177D的*2，在进行sub_40178C的异或，异或的数据和密文可以在vm结构体的下面找到，然后简单测试下hgame字符串，完全符合。

	xor=[0x0000005E, 0x00000046, 0x00000061, 0x00000043, 0x0000000E, 0x00000053, 0x00000049, 0x0000001F,
	    0x00000051, 0x0000005E, 0x00000036, 0x00000037, 0x00000029, 0x00000041, 0x00000063, 0x0000003B,
	    0x00000064, 0x0000003B, 0x00000015, 0x00000018, 0x0000005B, 0x0000003E, 0x00000022, 0x00000050,
	    0x00000046, 0x0000005E, 0x00000035, 0x0000004E, 0x00000043, 0x00000023, 0x00000060, 0x0000003B,
	    0x00000000, 0xFFFFFFEF, 0x00000015]
	enc= [0x0000008E, 0x00000088, 0x000000A3, 0x00000099, 0x000000C4,
	    0x000000A5, 0x000000C3, 0x000000DD, 0x00000019, 0x000000EC, 0x0000006C, 0x0000009B, 0x000000F3,
	    0x0000001B, 0x0000008B, 0x0000005B, 0x0000003E, 0x0000009B, 0x000000F1, 0x00000086, 0x000000F3,
	    0x000000F4, 0x000000A4, 0x000000F8, 0x000000F8, 0x00000098, 0x000000AB, 0x00000086, 0x00000089,
	    0x00000061, 0x00000022, 0x000000C1, 0x00000002, 0x00000000, 0xFFFFFFFA, 0x00000073, 0x00000075,
	    0x00000063, 0x00000063, 0x00000065, 0x00000073, 0x00000073]
	
	for i in range(32):
	  for f in range(127):
	    if((f*2)^xor[i]==enc[i]):
	      print(chr(f),end='')
	#hgame{Ea$Y-Vm-t0-PrOTeCT_cOde!
!}

hardasm

考点AVX2 指令集，之前长安杯也遇到过，当时是0解来着，也没wp样，实际上类似的题也在N1CTF有过，只不过不太一样。如果按流程看，也太头大了，主要就是熟悉指令，https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html

直接贴个官方wp吧，说不定以后用的到

记录加密指令的个数

a = 0x140001081  # 起始地址
opcode = set()  # 利用集合自动去重
while True:
    if ea >= 0x0140007F17:
    break
opcode.add(print_insn_mnem(ea))
ea = next_head(ea)  # 到达下个指令的地址
print(opcode)
# {'vpsubb', 'vpermd', 'vpshufb', 'vpaddb', 'vpxor'}

解密

import numpy

def vpaddb(a, b):
    global num
    for i in range(32):
        num[a][i] += num[b][i]


def vpsubb(a, b):
    global num
    for i in range(32):
        num[a][i] -= num[b][i]


def vpxor(a, b):
    global num
    for i in range(32):
        num[a][i] ^= num[b][i]


def vpshufb(a, b):
    global num

    c = [0] * 32
    for i in range(16):
        if num[b][i] & 0x80:
            c[i] = 0
    else:
        c[i] = num[a][num[b][i] & 0xF]
    if num[b][i + 16] & 0x80:
        c[i + 16] = 0
    else:
        c[i + 16] = num[a][16 + (num[b][i + 16] & 0xF)]
    num[a] = c


def invvpshufb(a, b):
    global num
    c = [0] * 32
    for i in range(16):
        if num[b][i] & 0x80:
            c[i] = 0
    else:
        c[num[b][i] & 0xF] = num[a][i]
    if num[b][i + 16] & 0x80:
        c[i + 16] = 0
    else:
        c[16 + (num[b][i + 16] & 0xF)] = num[a][i + 16]
    num[a] = c


def vpermd(a, b):
    global num
    c = [0] * 32
    for i in range(8):
        c[i * 4] = num[a][num[b][i * 4] * 4]
        c[i * 4 + 1] = num[a][num[b][i * 4] * 4 + 1]
        c[i * 4 + 2] = num[a][num[b][i * 4] * 4 + 2]
        c[i * 4 + 3] = num[a][num[b][i * 4] * 4 + 3]
        num[a] = c


def invvpermd(a, b):
    global num


    c = [0] * 32
    for i in range(8):
        c[num[b][i * 4] * 4] = num[a][i * 4]
        c[num[b][i * 4] * 4 + 1] = num[a][i * 4 + 1]
        c[num[b][i * 4] * 4 + 2] = num[a][i * 4 + 2]
        c[num[b][i * 4] * 4 + 3] = num[a][i * 4 + 3]
        num[a] = c


op = []
flag =[147, 203, 231, 147, 169, 129, 13, 182, 216, 221, 156, 127, 192, 77, 205, 240, 0, 160, 159, 34, 137, 239
    , 84, 93, 239, 0, 141, 254, 94, 76, 208, 236]
num = numpy.uint8([[104, 103, 97, 109, 101, 123, 114, 105, 103, 104, 116, 95, 121, 111, 117, 114, 95,
                    97, 115, 109, 95, 105, 115, 95, 103, 111, 111, 100, 33, 33, 125, 0],
                   [
                       240, 255, 100, 38, 242, 143, 64, 238, 238, 39, 7, 239, 136, 10, 33, 20, 195, 252, 112, 229, 168,
                       243, 245
                       , 26, 212, 60, 177, 12, 229, 188, 185, 27],
                   [
                       13, 192, 132, 197, 14, 128, 80, 255, 40, 26, 128, 72, 29, 193, 227, 29, 52, 81, 155, 53, 188,
                       213, 244, 19
                       5, 196, 64, 144, 7, 42, 192, 45, 144],
                   [
                       137, 161, 62, 192, 229, 20, 95, 197, 95, 20, 176, 208, 37, 31, 232, 245, 176, 52, 54, 194, 199,
                       160, 178,
                       60, 94, 126, 156, 164, 152, 232, 84, 11],
                   [
                       51, 95, 98, 104, 13, 100, 168, 255, 143, 153, 167, 148, 158, 154, 41, 52, 39, 54, 214, 130, 194,
                       109, 232
                       , 170, 150, 74, 101, 192, 12, 55, 25, 201],
                   [
                       143, 33, 168, 55, 67, 9, 7, 51, 166, 135, 76, 74, 161, 116, 75, 230, 85, 19, 91, 63, 28, 215,
                       185, 158, 57,
                       96, 29, 198, 145, 138, 54, 139],
                   [0, 1, 8, 9, 10, 2, 3, 4, 5, 12, 13, 14, 6, 7, 11, 15, 0, 6, 7, 8, 9, 10, 2, 3, 4, 5, 13, 14, 11, 12,
                    1, 15
                    ],
                   [0, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 6, 0, 0, 0, 7, 0, 0, 0]])
ea = 0x140001081
while True:  # 运行一遍汇编，验证加密过程是否正确，并得到ymm1~ymm7的数据
    if ea >= 0x0140007F17:
        break
    opcode = print_insn_mnem(ea)  # 得到汇编助记符
    opnum1 = int(print_operand(ea, 0)[-1])  # 得到第一个操作数的序号（即ymm0取0）
    opnum2 = int(print_operand(ea, 1)[-1])
    opnum3 = int(print_operand(ea, 2)[-1])
    op.append([opcode, opnum1, opnum2, opnum3])
    if opcode == 'vpaddb':
        vpaddb(opnum1, opnum3)
    elif opcode == 'vpsubb':
        vpsubb(opnum1, opnum3)
    elif opcode == 'vpxor':
        vpxor(opnum1, opnum3)
    elif opcode == 'vpshufb':
        vpshufb(opnum1, opnum3)
    elif opcode == 'vpermd':
        vpermd(opnum1, opnum2)
    ea = next_head(ea)

num[0] = flag
for i in op[::-1]:  # 倒序解密
    if i[0] == 'vpaddb':
        vpsubb(i[1], i[3])
    elif i[0] == 'vpsubb':
        vpaddb(i[1], i[3])
    elif i[0] == 'vpxor':
        vpxor(i[1], i[3])
    elif i[0] == 'vpshufb':
        invvpshufb(i[1], i[3])
    elif i[0] == 'vpermd':
        invvpermd(i[1], i[2])
for i in num[0]:
    try:
        print(chr(i), end='')
    except UnicodeEncodeError:
        print(i, end='')

然后就是P1umH0师傅的wp，比较巧妙，因为这个题可以看做单字节加密，所以可以挨着爆破。

# -*- coding:utf-8 -*-
import subprocess
real_flag="hgame{"#绝对正确的前6个字符
cur_index=6#当前爆破的位置
while cur_index<32:
    for i in range(32,128):#当前爆破的位置上的字符
        real_flag_arr = [0] * 32
        for j in range(len(real_flag)):#正确的先复制一下
            real_flag_arr[j]=ord(real_flag[j])
        real_flag_arr[len(real_flag_arr)-1]=ord("}")#最后一个字符"}"固定
        for j in range(len(real_flag_arr)-2,cur_index,-1):#除了当前爆破的位置，其他位置上都设置为32
            real_flag_arr[j]=32
        real_flag_arr[cur_index]=i#设置当前爆破的位置上的字符
        real_flag_arr_s="".join(chr(k) for k in real_flag_arr)#输入到程序中的字符串
        p = subprocess.Popen(["D:\\ctfdownloadfiles\\hardasm.exe"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        p.stdin.write(real_flag_arr_s.encode())
        p.stdin.close()
        out = p.stdout.read()
        if len(out)>cur_index:#判断程序打印出的0xFF的个数是否增加，增加则说明当前爆破的位置上的字符设置的是正确的
            real_flag+=chr(i)
            cur_index+=1
            print(real_flag)
            break
# hgame{r
# hgame{ri
# hgame{rig
# hgame{righ
# hgame{right
# hgame{right_
# hgame{right_y
# hgame{right_yo
# hgame{right_you
# hgame{right_your
# hgame{right_your_
# hgame{right_your_a
# hgame{right_your_as
# hgame{right_your_asm
# hgame{right_your_asm_
# hgame{right_your_asm_i
# hgame{right_your_asm_is
# hgame{right_your_asm_is_
# hgame{right_your_asm_is_g
# hgame{right_your_asm_is_go
# hgame{right_your_asm_is_goo
# hgame{right_your_asm_is_good
# hgame{right_your_asm_is_good!
# hgame{right_your_asm_is_good!!
# hgame{right_your_asm_is_good!!}
# hgame{right_your_asm_is_good!!}