BUUCTF reverse wp 61 - 65

[FlareOn1]Bob Doge

// XXXXXXXXXXXXXXX.Form1
// Token: 0x06000002 RID: 2 RVA: 0x00002060 File Offset: 0x00000260
private void btnDecode_Click(object sender, EventArgs e)
{
	this.pbRoge.Image = Resources.bob_roge;
	byte[] dat_secret = Resources.dat_secret;
	string text = "";
	foreach (byte b in dat_secret)
	{
		text += (char)((b >> 4 | ((int)b << 4 & 240)) ^ 41);
	}
	text += "\0";
	string text2 = "";
	for (int j = 0; j < text.Length; j += 2)
	{
		text2 += text[j + 1];
		text2 += text[j];
	}
	string text3 = "";
	for (int k = 0; k < text2.Length; k++)
	{
		char c = text2[k];
		text3 += (char)((byte)text2[k] ^ 102);
	}
	this.lbl_title.Text = text3;
}

某种decode算法, 直接断点执行查看变量

[2019红帽杯]xx

IDA64打开进行分析, 开始这段是在判断flag长度是否为19位

  v3 = -1i64;
  v4 = -1i64;
  do
    ++v4;
  while ( *((_BYTE *)flag + v4) );
  if ( v4 != 19 )
  {
    sub_140001620(std::cout, "error\n");
    _exit((int)flag);
  }

下面这段是在判断flag前4位是否在限定字符串范围内

  do
  {
    v10 = *((_BYTE *)v9 + (char *)flag - (char *)v5);
    v11 = 0;
    *(_BYTE *)v9 = v10;
    v12 = 0i64;
    v13 = -1i64;
    do
      ++v13;
    while ( *(_BYTE *)(v6 + v13) );
    if ( v13 )
    {
      do
      {
        if ( v10 == *(_BYTE *)(v6 + v12) )
          break;
        ++v11;
        ++v12;
      }
      while ( v11 < v13 );
    }
    v14 = -1i64;
    do
      ++v14;
    while ( *(_BYTE *)(v6 + v14) );
    if ( v11 == v14 )
      _exit(v6);
    v9 = (__int128 *)((char *)v9 + 1);
  }
  while ( (char *)v9 - (char *)v5 < 4 );
  *((_BYTE *)v5 + 4) = 0;

下面的sub_140001AB0函数用findcrypt检测可以知道是xxtea加密, 所用秘钥就是flag前4位, 加密后做数据位的置换操作, 这里flag前4位猜测为"flag"

  v17 = sub_140001AB0(flag, v3, &v30, &Size);
  v18 = Size;
  v19 = (_BYTE *)v17;
  v20 = operator new(Size);
  v21 = 1;
  *v20 = v19[2];
  v22 = v20 + 1;
  v20[1] = *v19;
  v20[2] = v19[3];
  v20[3] = v19[1];
  v20[4] = v19[6];
  v20[5] = v19[4];
  v20[6] = v19[7];
  v20[7] = v19[5];
  v20[8] = v19[10];
  v20[9] = v19[8];
  v20[10] = v19[11];
  v20[11] = v19[9];
  v20[12] = v19[14];
  v20[13] = v19[12];
  v20[14] = v19[15];
  v20[15] = v19[13];
  v20[16] = v19[18];
  v20[17] = v19[16];
  v20[18] = v19[19];
  v20[19] = v19[17];
  v20[20] = v19[22];
  v20[21] = v19[20];
  v20[22] = v19[23];

接着跟一段异或处理, 简单模拟一下就知道是按3的倍数来逐位异或, 比如第21位会和 (v23 < 21 / 3 == 7), 即第0, 1, 2, 3, 4, 5, 6位进行异或, 写逆则反过来进行异或.

  for ( v20[23] = v19[21]; v21 < v18; ++v22 )
  {
    v23 = 0i64;
    if ( v21 / 3 > 0 )
    {
      v24 = *v22;
      do
      {
        v24 ^= v20[v23++];
        *v22 = v24;
      }
      while ( v23 < v21 / 3 );
    }
    ++v21;
  }

最后就是和固定的数据进行比较, v30到v32这一串数据按小端序提出来

  *(_QWORD *)&v30 = 0xC0953A7C6B40BCCEui64;
  v25 = v20 - (_BYTE *)&v30;
  *((_QWORD *)&v30 + 1) = 0x3502F79120209BEFi64;
  v26 = 0i64;
  v31 = 0xC8021823;
  v32 = 0xFA5656E7;
  do
  {
    if ( *((_BYTE *)&v30 + v26) != *((_BYTE *)&v30 + v26 + v25) )
      _exit(v8 * v8);
    ++v8;
    ++v26;
  }
  while ( v26 < 24 );
  v27 = sub_140001620(std::cout, "You win!");

整理一下逻辑, 写逆 (xxtea的代码直接搬网上现成的

#include 
#include 
#define DELTA 0x9e3779b9
#define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (key[(p&3)^e] ^ z)))
#define uint32_t unsigned int

int cmpvalues[] = {
    0xCE, 0xBC, 0x40, 0x68, 0x7C, 0x3A, 0x95, 0xC0, 0xEF, 0x9B,
    0x20, 0x20, 0x91, 0xF7, 0x02, 0x35, 0x23, 0x18, 0x02, 0xC8,
    0xE7, 0x56, 0x56, 0xFA
};
int testvals[24] = {0};

int replacearr[] = {
    2,0,3,1,6,4,7,5,10,8,11,9,14,12,15,13,18,16,19,17,22,20,23,21
};

void btea(uint32_t *v, int n, uint32_t const key[4])
{
        uint32_t y, z, sum;
        unsigned p, rounds, e;
        if (n > 1)            /* Coding Part */
        {
                rounds = 6 + 52/n;
                sum = 0;
                z = v[n-1];
                do
                {
                        sum += DELTA;
                        e = (sum >> 2) & 3;
                        for (p=0; p<n-1; p++)
                        {
                                y = v[p+1];
                                z = v[p] += MX;
                        }
                        y = v[0];
                        z = v[n-1] += MX;
                }
                while (--rounds);
        }
        else if (n < -1)      /* Decoding Part */
        {
                n = -n;
                rounds = 6 + 52/n;
                sum = rounds*DELTA;
                y = v[0];
                do
                {
                        e = (sum >> 2) & 3;
                        for (p=n-1; p>0; p--)
                        {
                                z = v[p-1];
                                y = v[p] -= MX;
                        }
                        z = v[n-1];
                        y = v[0] -= MX;
                        sum -= DELTA;
                }
                while (--rounds);
        }
}

void Print(int *arr, int len) {
    for (int i = len - 1; i >= 0; --i) {
        printf("%2x ", arr[i]);
    }
    printf("\n");
}

int main()
{
    int tmp = 0;
    for (int i = 23; i >= 3; --i) {
        for (int j = 6 - tmp; j >= 0; --j)
            cmpvalues[i] ^= cmpvalues[j];
        if (i % 3 == 0) tmp++;
    }

    for (int i = 0; i < 23; ++i)
        testvals[i] = cmpvalues[replacearr[i]];

    Print(testvals, 24);
    //  0x 073fbdf 0x3ed4 51e 0xad13cb58 0xa9129d12 0xf4b2b2e7 0xbca6ce40

    uint32_t v[6] = {(unsigned int)0x40cea5bc, (unsigned int)0xe7b2b2f4, (unsigned int)0x129d12a9, 
        (unsigned int)0x5bc810ae, (unsigned int)0x1d06d73d, (unsigned int)0xdcf870dc};
    
    uint32_t const k[4]= {(unsigned int)0x67616c66, 0x0, 0x0, 0x0};

    int n = 6;
    btea(v, -n, k);
    printf("decrypt:%x %x %x %x %x %x\n",v[0], v[1], v[2], v[3], v[4], v[5]);

    char flagstr[] = "67616c665858437b646e615f742b2b5f7d6165";
    int flag[20] = {0};
    int cnt = 0;
    int flagidx = 0;
    int temp = 0;
    for (int i = 0; i < sizeof(flagstr); ++i) {
        if (cnt == 2) {
        	temp = 0;
        	cnt = 0;
		} 
        cnt++;
    
        if (cnt == 1) {
            if (flagstr[i] <= 'f' && flagstr[i] >= 'a')
                temp += 16 * (flagstr[i] - 'a' + 10);
            else temp += 16 * (flagstr[i] - '0');
        } else if (cnt == 2) {
            if (flagstr[i] <= 'f' && flagstr[i] >= 'a')
                temp += flagstr[i] - 'a' + 10;
            else temp += flagstr[i] - '0';
            flag[flagidx++] = temp;
        }
    }

    for (int i = 0; i < 16; i += 4) {
        for (int j = i + 3; j >= i; --j) {
            printf("%c", flag[j]);
        }
    }
    for (int i = 19; i >= 16; --i)
        printf("%c", flag[i]);

    return 0;
}                                                                    

equation

js混淆, html打开看一下是类似这种形式

<script>
flag = "xxx";
if (flag.length == 0x2a){
    l = flag.split("").map(i => i.charCodeAt());
    if(l[!+[]+!+[]+!+[]+!+[]+[+[]]]+l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]]]-l[+[]]-l[+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]]]-l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+l[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]-l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+[+[]]]+l[+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]-l[+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]-l[+!+[]+[!+[]+!+[]+!+[]+!+[]]]-l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[+!+[]]-l[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+l[!+[]+!+[]+[!+[]+!+[]]]+l[!+[]+!+[]+!+[]+!+[]+[+!+[]]]+l[!+[]+!+[]+!+[]]-l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]-l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]-l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+!+[]+!+[]]+l[!+[]+!+[]+!+[]+[!+[]+!+[]]]-l[+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[+!+[]+[!+[]+!+[]]]-l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+[+[]]]+l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[+!+[]+[+[]]]+l[!+[]+!+[]]+l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]+l[!+[]+!+[]+[+!+[]]]+l[!+[]+!+[]+!+[]+[!+[]+!+[]+!+[]]]-l[+!+[]+[!+[]+!+[]+!+[]
    ...
+[]+!+[]+!+[]]]+l[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+l[+!+[]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]]-l[!+[]+!+[]+!+[]+[+!+[]]]==+(!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+[+!+[]])){
        alert('Congrats');
    }
    else {
        alert('Failed');
    }
}
script>

jsfuck的混淆, 写个正则解混淆

<script>
    function deEquation(str) {
        for(let i=0;i<=3;++i){
            str = str.replace(/l\[(\D*?)](\+l|-l|==)/g, (m, a, b) => 'l[' + eval(a) + ']' + b);
        }
        str = str.replace(/==(\D*?)&&/g, (m, a) => '==' + eval(a) + '&&');
      return str; 
    }
    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    res=deEquation(s);
    document.write(res);
script>

得到一个方程组, 预处理一下然后z3梭哈

'''
s = 'l[40]+l[35]+l[34]-l[0]-l[15]-l[37]+l[7]+l[6]-l[26]+l[20]+l[19]+l[8]-l[17]-l[14]-l[38]+l[1]-l[9]+l[22]+l[41]+l[3]-l[29]-l[36]-l[25]+l[5]+l[32]-l[16]+l[12]-l[24]+l[30]+l[39]+l[10]+l[2]+l[27]+l[28]+l[21]+l[33]-l[18]+l[4]==861&&l[31]+l[26]+l[11]-l[33]+l[27]-l[3]+l[12]+l[30]+l[1]+l[32]-l[16]+l[7]+l[10]-l[25]+l[38]-l[41]-l[14]-l[19]+l[29]+l[36]-l[9]-l[28]-l[6]-l[0]-l[22]-l[18]+l[20]-l[37]+l[4]-l[24]+l[34]-l[21]-l[39]-l[23]-l[8]-l[40]+l[15]-l[35]==-448&&l[26]+l[14]+l[15]+l[9]+l[13]+l[30]-l[11]+l[18]+l[23]+l[7]+l[3]+l[12]+l[25]-l[24]-l[39]-l[35]-l[20]+l[40]-l[8]+l[10]-l[5]-l[33]-l[31]+l[32]+l[19]+l[21]-l[6]+l[1]+l[16]+l[17]+l[29]+l[22]-l[4]-l[36]+l[41]+l[38]+l[2]+l[0]==1244&&l[5]+l[22]+l[15]+l[2]-l[28]-l[10]-l[3]-l[13]-l[18]+l[30]-l[9]+l[32]+l[19]+l[34]+l[23]-l[17]+l[16]-l[7]+l[24]-l[39]+l[8]-l[12]-l[40]-l[25]+l[37]-l[35]+l[11]-l[14]+l[20]-l[27]+l[4]-l[33]-l[21]+l[31]-l[6]+l[1]+l[38]-l[29]==-39&&l[41]-l[29]+l[23]-l[4]+l[20]-l[33]+l[35]+l[3]-l[19]-l[21]+l[11]+l[26]-l[24]-l[17]+l[37]+l[1]+l[16]-l[0]-l[13]+l[7]+l[10]+l[14]+l[22]+l[39]-l[40]+l[34]-l[38]+l[32]+l[25]-l[2]+l[15]+l[6]+l[28]-l[8]-l[5]-l[31]-l[30]-l[27]==485&&l[13]+l[19]+l[21]-l[2]-l[33]-l[0]+l[39]+l[31]-l[23]-l[41]+l[38]-l[29]+l[36]+l[24]-l[20]-l[9]-l[32]+l[37]-l[35]+l[40]+l[7]-l[26]+l[15]-l[10]-l[6]-l[16]-l[4]-l[5]-l[30]-l[14]-l[22]-l[25]-l[34]-l[17]-l[11]-l[27]+l[1]-l[28]==-1068&&l[32]+l[0]+l[9]+l[14]+l[11]+l[18]-l[13]+l[24]-l[2]-l[15]+l[19]-l[21]+l[1]+l[39]-l[8]-l[3]+l[33]+l[6]-l[5]-l[35]-l[28]+l[25]-l[41]+l[22]-l[17]+l[10]+l[40]+l[34]+l[27]-l[20]+l[23]+l[31]-l[16]+l[7]+l[12]-l[30]+l[29]-l[4]==939&&l[19]+l[11]+l[20]-l[16]+l[40]+l[25]+l[1]-l[31]+l[28]-l[23]+l[14]-l[9]-l[27]+l[35]+l[39]-l[37]-l[8]-l[22]+l[5]-l[6]+l[0]-l[32]+l[24]+l[33]+l[29]+l[38]+l[15]-l[2]+l[30]+l[7]+l[12]-l[3]-l[17]+l[34]+l[41]-l[4]-l[13]-l[26]==413&&l[22]+l[4]-l[9]+l[34]+l[35]+l[17]+l[3]-l[24]+l[38]-l[5]-l[41]-l[31]-l[0]-l[25]+l[33]+l[15]-l[1]-l[10]+l[16]-l[29]-l[12]+l[26]-l[39]-l[21]-l[18]-l[6]-l[40]-l[13]+l[8]+l[37]+l[19]+l[14]+l[32]+l[28]-l[11]+l[23]+l[36]+l[7]==117&&l[32]+l[16]+l[3]+l[11]+l[34]-l[31]+l[14]+l[25]+l[1]-l[30]-l[33]-l[40]-l[4]-l[29]+l[18]-l[27]+l[13]-l[19]-l[12]+l[23]-l[39]-l[41]-l[8]+l[22]-l[5]-l[38]-l[9]-l[37]+l[17]-l[36]+l[24]-l[21]+l[2]-l[26]+l[20]-l[7]+l[35]-l[0]==-313&&l[40]-l[1]+l[5]+l[7]+l[33]+l[29]+l[12]+l[38]-l[31]+l[2]+l[14]-l[35]-l[8]-l[24]-l[39]-l[9]-l[28]+l[23]-l[17]-l[22]-l[26]+l[32]-l[11]+l[4]-l[36]+l[10]+l[20]-l[18]-l[16]+l[6]-l[0]+l[3]-l[30]+l[37]-l[19]+l[21]+l[25]-l[15]==-42&&l[21]+l[26]-l[17]-l[25]+l[27]-l[22]-l[39]-l[23]-l[15]-l[20]-l[32]+l[12]+l[3]-l[6]+l[28]+l[31]+l[13]-l[16]-l[37]-l[30]-l[5]+l[41]+l[29]+l[36]+l[1]+l[11]+l[24]+l[18]-l[40]+l[19]-l[35]+l[2]-l[38]+l[14]-l[9]+l[4]+l[0]-l[33]==289&&l[29]+l[31]+l[32]-l[17]-l[7]+l[34]+l[2]+l[14]+l[23]-l[4]+l[3]+l[35]-l[33]-l[9]-l[20]-l[37]+l[24]-l[27]+l[36]+l[15]-l[18]-l[0]+l[12]+l[11]-l[38]+l[6]+l[22]+l[39]-l[25]-l[10]-l[19]-l[1]+l[13]-l[41]+l[30]-l[16]+l[28]-l[26]==-117&&l[5]+l[37]-l[39]+l[0]-l[27]+l[12]+l[41]-l[22]+l[8]-l[16]-l[38]+l[9]+l[15]-l[35]-l[29]+l[18]+l[6]-l[25]-l[28]+l[36]+l[34]+l[32]-l[14]-l[1]+l[20]+l[40]-l[19]-l[4]-l[7]+l[26]+l[30]-l[10]+l[13]-l[21]+l[2]-l[23]-l[3]-l[33]==-252&&l[29]+l[10]-l[41]-l[9]+l[12]-l[28]+l[11]+l[40]-l[27]-l[8]+l[32]-l[25]-l[23]+l[39]-l[1]-l[36]-l[15]+l[33]-l[20]+l[18]+l[22]-l[3]+l[6]-l[34]-l[21]+l[19]+l[26]+l[13]-l[4]+l[7]-l[37]+l[38]-l[2]-l[30]-l[0]-l[35]+l[5]+l[17]==-183&&l[6]-l[8]-l[20]+l[34]-l[33]-l[25]-l[4]+l[3]+l[17]-l[13]-l[15]-l[40]+l[1]-l[30]-l[14]-l[28]-l[35]+l[38]-l[22]+l[2]+l[24]-l[29]+l[5]+l[9]+l[37]+l[23]-l[18]+l[19]-l[21]+l[11]+l[36]+l[41]-l[7]-l[32]+l[10]+l[26]-l[0]+l[31]==188&&l[3]+l[6]-l[41]+l[10]+l[39]+l[37]+l[1]+l[8]+l[21]+l[24]+l[29]+l[12]+l[27]-l[38]+l[11]+l[23]+l[28]+l[33]-l[31]+l[14]-l[5]+l[32]-l[17]+l[40]-l[34]+l[20]-l[22]-l[16]+l[19]+l[2]-l[36]-l[7]+l[18]+l[15]+l[26]-l[0]-l[4]+l[35]==1036&&l[28]-l[33]+l[2]+l[37]-l[12]-l[9]-l[39]+l[16]-l[32]+l[8]-l[36]+l[31]+l[10]-l[4]+l[21]-l[25]+l[18]+l[24]-l[0]+l[29]-l[26]+l[35]-l[22]-l[41]-l[6]+l[15]+l[19]+l[40]+l[7]+l[34]+l[17]-l[3]-l[13]+l[5]+l[23]+l[11]-l[27]+l[1]==328&&l[22]-l[32]+l[17]-l[9]+l[20]-l[18]-l[34]+l[23]+l[36]-l[35]-l[38]+l[27]+l[4]-l[5]-l[41]+l[29]+l[33]+l[0]-l[37]+l[28]-l[40]-l[11]-l[12]+l[7]+l[1]+l[2]-l[26]-l[16]-l[8]+l[24]-l[25]+l[3]-l[6]-l[19]-l[39]-l[14]-l[31]+l[10]==-196&&l[11]+l[13]+l[14]-l[15]-l[29]-l[2]+l[7]+l[20]+l[30]-l[36]-l[33]-l[19]+l[31]+l[0]-l[39]-l[4]-l[6]+l[38]+l[35]-l[28]+l[34]-l[9]-l[23]-l[26]+l[37]-l[8]-l[27]+l[5]-l[41]+l[3]+l[17]+l[40]-l[10]+l[25]+l[12]-l[24]+l[18]+l[32]==7&&l[34]-l[37]-l[40]+l[4]-l[22]-l[31]-l[6]+l[38]+l[13]-l[28]+l[8]+l[30]-l[20]-l[7]-l[32]+l[26]+l[1]-l[18]+l[5]+l[35]-l[24]-l[41]+l[9]-l[0]-l[2]-l[15]-l[10]+l[12]-l[36]+l[33]-l[16]-l[14]-l[25]-l[29]-l[21]+l[27]+l[3]-l[17]==-945&&l[12]-l[30]-l[8]+l[20]-l[2]-l[36]-l[25]-l[0]-l[19]-l[28]-l[7]-l[11]-l[33]+l[4]-l[23]+l[10]-l[41]+l[39]-l[32]+l[27]+l[18]+l[15]+l[34]+l[13]-l[40]+l[29]-l[6]+l[37]-l[14]-l[16]+l[38]-l[26]+l[17]+l[31]-l[22]-l[35]+l[5]-l[1]==-480&&l[36]-l[11]-l[34]+l[8]+l[0]+l[15]+l[28]-l[39]-l[32]-l[2]-l[27]+l[22]+l[16]-l[30]-l[3]+l[31]-l[26]+l[20]+l[17]-l[29]-l[18]+l[19]-l[10]+l[6]-l[5]-l[38]-l[25]-l[24]+l[4]+l[23]+l[9]+l[14]+l[21]-l[37]+l[13]-l[41]-l[12]+l[35]==-213&&l[19]-l[36]-l[12]+l[33]-l[27]-l[37]-l[25]+l[38]+l[16]-l[18]+l[22]-l[39]+l[13]-l[7]-l[31]-l[26]+l[15]-l[10]-l[9]-l[2]-l[30]-l[11]+l[41]-l[4]+l[24]+l[34]+l[5]+l[17]+l[14]+l[6]+l[8]-l[21]-l[23]+l[32]-l[1]-l[29]-l[0]+l[3]==-386&&l[0]+l[7]-l[28]-l[38]+l[19]+l[31]-l[5]+l[24]-l[3]+l[33]-l[12]-l[29]+l[32]+l[1]-l[34]-l[9]-l[25]+l[26]-l[8]+l[4]-l[10]+l[40]-l[15]-l[11]-l[27]+l[36]+l[14]+l[41]-l[35]-l[13]-l[17]-l[21]-l[18]+l[39]-l[2]+l[20]-l[23]-l[22]==-349&&l[10]+l[22]+l[21]-l[0]+l[15]-l[6]+l[20]-l[29]-l[30]-l[33]+l[19]+l[23]-l[28]+l[41]-l[27]-l[12]-l[37]-l[32]+l[34]-l[36]+l[3]+l[1]-l[13]+l[18]+l[14]+l[9]+l[7]-l[39]+l[8]+l[2]-l[31]-l[5]-l[40]+l[38]-l[26]-l[4]+l[16]-l[25]==98&&l[28]+l[38]+l[20]+l[0]-l[5]-l[34]-l[41]+l[22]-l[26]+l[11]+l[29]+l[31]-l[3]-l[16]+l[23]+l[17]-l[18]+l[9]-l[4]-l[12]-l[19]-l[40]-l[27]+l[33]+l[8]-l[37]+l[2]+l[15]-l[24]-l[39]+l[10]+l[35]-l[1]+l[30]-l[36]-l[25]-l[14]-l[32]==-412&&l[1]-l[24]-l[29]+l[39]+l[41]+l[0]+l[9]-l[19]+l[6]-l[37]-l[22]+l[32]+l[21]+l[28]+l[36]+l[4]-l[17]+l[20]-l[13]-l[35]-l[5]+l[33]-l[27]-l[30]+l[40]+l[25]-l[18]+l[34]-l[3]-l[10]-l[16]-l[23]-l[38]+l[8]-l[14]-l[11]-l[7]+l[12]==-95&&l[2]-l[24]+l[31]+l[0]+l[9]-l[6]+l[7]-l[1]-l[22]+l[8]-l[23]+l[40]+l[20]-l[38]-l[11]-l[14]+l[18]-l[36]+l[15]-l[4]-l[41]-l[12]-l[34]+l[32]-l[35]+l[17]-l[21]-l[10]-l[29]+l[39]-l[16]+l[27]+l[26]-l[3]-l[5]+l[13]+l[25]-l[28]==-379&&l[19]-l[17]+l[31]+l[14]+l[6]-l[12]+l[16]-l[8]+l[27]-l[13]+l[41]+l[2]-l[7]+l[32]+l[1]+l[25]-l[9]+l[37]+l[34]-l[18]-l[40]-l[11]-l[10]+l[38]+l[21]+l[3]-l[0]+l[24]+l[15]+l[23]-l[20]+l[26]+l[22]-l[4]-l[28]-l[5]+l[39]+l[35]==861&&l[35]+l[36]-l[16]-l[26]-l[31]+l[0]+l[21]-l[13]+l[14]+l[39]+l[7]+l[4]+l[34]+l[38]+l[17]+l[22]+l[32]+l[5]+l[15]+l[8]-l[29]+l[40]+l[24]+l[6]+l[30]-l[2]+l[25]+l[23]+l[1]+l[12]+l[9]-l[10]-l[3]-l[19]+l[20]-l[37]-l[33]-l[18]==1169&&l[13]+l[0]-l[25]-l[32]-l[21]-l[34]-l[14]-l[9]-l[8]-l[15]-l[16]+l[38]-l[35]-l[30]-l[40]-l[12]+l[3]-l[19]+l[4]-l[41]+l[2]-l[36]+l[37]+l[17]-l[1]+l[26]-l[39]-l[10]-l[33]+l[5]-l[27]-l[23]-l[24]-l[7]+l[31]-l[28]-l[18]+l[6]==-1236&&l[20]+l[27]-l[29]-l[25]-l[3]+l[28]-l[32]-l[11]+l[10]+l[31]+l[16]+l[21]-l[7]+l[4]-l[24]-l[35]+l[26]+l[12]-l[37]+l[6]+l[23]+l[41]-l[39]-l[38]+l[40]-l[36]+l[8]-l[9]-l[5]-l[1]-l[13]-l[14]+l[19]+l[0]-l[34]-l[15]+l[17]+l[22]==-114&&l[12]-l[28]-l[13]-l[23]-l[33]+l[18]+l[10]+l[11]+l[2]-l[36]+l[41]-l[16]+l[39]+l[34]+l[32]+l[37]-l[38]+l[20]+l[6]+l[7]+l[31]+l[5]+l[22]-l[4]-l[15]-l[24]+l[17]-l[3]+l[1]-l[35]-l[9]+l[30]+l[25]-l[0]-l[8]-l[14]+l[26]+l[21]==659&&l[21]-l[3]+l[7]-l[27]+l[0]-l[32]-l[24]-l[37]+l[4]-l[22]+l[20]-l[5]-l[30]-l[31]-l[1]+l[15]+l[41]+l[12]+l[40]+l[38]-l[17]-l[39]+l[19]-l[13]+l[23]+l[18]-l[2]+l[6]-l[33]-l[9]+l[28]+l[8]-l[16]-l[10]-l[14]+l[34]+l[35]-l[11]==-430&&l[11]-l[23]-l[9]-l[19]+l[17]+l[38]-l[36]-l[22]-l[10]+l[27]-l[14]-l[4]+l[5]+l[31]+l[2]+l[0]-l[16]-l[8]-l[28]+l[3]+l[40]+l[25]-l[33]+l[13]-l[32]-l[35]+l[26]-l[20]-l[41]-l[30]-l[12]-l[7]+l[37]-l[39]+l[15]+l[18]-l[29]-l[21]==-513&&l[32]+l[19]+l[4]-l[13]-l[17]-l[30]+l[5]-l[33]-l[37]-l[15]-l[18]+l[7]+l[25]-l[14]+l[35]+l[40]+l[16]+l[1]+l[2]+l[26]-l[3]-l[39]-l[22]+l[23]-l[36]-l[27]-l[9]+l[6]-l[41]-l[0]-l[31]-l[20]+l[12]-l[8]+l[29]-l[11]-l[34]+l[21]==-502&&l[30]-l[31]-l[36]+l[3]+l[9]-l[40]-l[33]+l[25]+l[39]-l[26]+l[23]-l[0]-l[29]-l[32]-l[4]+l[37]+l[28]+l[21]+l[17]+l[2]+l[24]+l[6]+l[5]+l[8]+l[16]+l[27]+l[19]+l[12]+l[20]+l[41]-l[22]+l[15]-l[11]+l[34]-l[18]-l[38]+l[1]-l[14]==853&&l[38]-l[10]+l[16]+l[8]+l[21]-l[25]+l[36]-l[30]+l[31]-l[3]+l[5]-l[15]+l[23]-l[28]+l[7]+l[12]-l[29]+l[22]-l[0]-l[37]-l[14]-l[11]+l[32]+l[33]-l[9]+l[39]+l[41]-l[19]-l[1]+l[18]-l[4]-l[6]+l[13]+l[20]-l[2]-l[35]-l[26]+l[27]==-28&&l[11]+l[18]-l[26]+l[15]-l[14]-l[33]+l[7]-l[23]-l[25]+l[0]-l[6]-l[21]-l[16]+l[17]-l[19]-l[28]-l[38]-l[37]+l[9]+l[20]-l[8]-l[3]+l[22]-l[35]-l[10]-l[31]-l[2]+l[41]-l[1]-l[4]+l[24]-l[34]+l[39]+l[40]+l[32]-l[5]+l[36]-l[27]==-529&&l[38]+l[8]+l[36]+l[35]-l[23]-l[34]+l[13]-l[4]-l[27]-l[24]+l[26]+l[31]-l[30]-l[5]-l[40]+l[28]-l[11]-l[2]-l[39]+l[15]+l[10]-l[17]+l[3]+l[19]+l[22]+l[33]+l[0]+l[37]+l[16]-l[9]-l[32]+l[25]-l[21]-l[12]+l[6]-l[41]+l[20]-l[18]==-12&&l[6]-l[30]-l[20]-l[27]-l[14]-l[39]+l[41]-l[33]-l[0]+l[25]-l[32]-l[3]+l[26]-l[12]+l[8]-l[35]-l[24]+l[15]+l[9]-l[4]+l[13]+l[36]+l[34]+l[1]-l[28]-l[21]+l[18]+l[23]+l[29]-l[10]-l[38]+l[22]+l[37]+l[5]+l[19]+l[7]+l[16]-l[31]==81&&'
arr = s.split('&&')
for each in arr:
    print('s.add(' + each + ')')
'''

from z3 import *
l = [0 for _ in range(0x2a)]
for i in range(0x2a):
    l[i] = Int('l[' + str(i) + ']')

s = Solver()
for i in l:
    s.add(i>0)
    s.add(i<255)

s.add(l[40]+l[35]+l[34]-l[0]-l[15]-l[37]+l[7]+l[6]-l[26]+l[20]+l[19]+l[8]-l[17]-l[14]-l[38]+l[1]-l[9]+l[22]+l[41]+l[3]-l[29]-l[36]-l[25]+l[5]+l[32]-l[16]+l[12]-l[24]+l[30]+l[39]+l[10]+l[2]+l[27]+l[28]+l[21]+l[33]-l[18]+l[4]==861)
s.add(l[31]+l[26]+l[11]-l[33]+l[27]-l[3]+l[12]+l[30]+l[1]+l[32]-l[16]+l[7]+l[10]-l[25]+l[38]-l[41]-l[14]-l[19]+l[29]+l[36]-l[9]-l[28]-l[6]-l[0]-l[22]-l[18]+l[20]-l[37]+l[4]-l[24]+l[34]-l[21]-l[39]-l[23]-l[8]-l[40]+l[15]-l[35]==-448)
s.add(l[26]+l[14]+l[15]+l[9]+l[13]+l[30]-l[11]+l[18]+l[23]+l[7]+l[3]+l[12]+l[25]-l[24]-l[39]-l[35]-l[20]+l[40]-l[8]+l[10]-l[5]-l[33]-l[31]+l[32]+l[19]+l[21]-l[6]+l[1]+l[16]+l[17]+l[29]+l[22]-l[4]-l[36]+l[41]+l[38]+l[2]+l[0]==1244)
s.add(l[5]+l[22]+l[15]+l[2]-l[28]-l[10]-l[3]-l[13]-l[18]+l[30]-l[9]+l[32]+l[19]+l[34]+l[23]-l[17]+l[16]-l[7]+l[24]-l[39]+l[8]-l[12]-l[40]-l[25]+l[37]-l[35]+l[11]-l[14]+l[20]-l[27]+l[4]-l[33]-l[21]+l[31]-l[6]+l[1]+l[38]-l[29]==-39)
s.add(l[41]-l[29]+l[23]-l[4]+l[20]-l[33]+l[35]+l[3]-l[19]-l[21]+l[11]+l[26]-l[24]-l[17]+l[37]+l[1]+l[16]-l[0]-l[13]+l[7]+l[10]+l[14]+l[22]+l[39]-l[40]+l[34]-l[38]+l[32]+l[25]-l[2]+l[15]+l[6]+l[28]-l[8]-l[5]-l[31]-l[30]-l[27]==485)
s.add(l[13]+l[19]+l[21]-l[2]-l[33]-l[0]+l[39]+l[31]-l[23]-l[41]+l[38]-l[29]+l[36]+l[24]-l[20]-l[9]-l[32]+l[37]-l[35]+l[40]+l[7]-l[26]+l[15]-l[10]-l[6]-l[16]-l[4]-l[5]-l[30]-l[14]-l[22]-l[25]-l[34]-l[17]-l[11]-l[27]+l[1]-l[28]==-1068)
s.add(l[32]+l[0]+l[9]+l[14]+l[11]+l[18]-l[13]+l[24]-l[2]-l[15]+l[19]-l[21]+l[1]+l[39]-l[8]-l[3]+l[33]+l[6]-l[5]-l[35]-l[28]+l[25]-l[41]+l[22]-l[17]+l[10]+l[40]+l[34]+l[27]-l[20]+l[23]+l[31]-l[16]+l[7]+l[12]-l[30]+l[29]-l[4]==939)
s.add(l[19]+l[11]+l[20]-l[16]+l[40]+l[25]+l[1]-l[31]+l[28]-l[23]+l[14]-l[9]-l[27]+l[35]+l[39]-l[37]-l[8]-l[22]+l[5]-l[6]+l[0]-l[32]+l[24]+l[33]+l[29]+l[38]+l[15]-l[2]+l[30]+l[7]+l[12]-l[3]-l[17]+l[34]+l[41]-l[4]-l[13]-l[26]==413)
s.add(l[22]+l[4]-l[9]+l[34]+l[35]+l[17]+l[3]-l[24]+l[38]-l[5]-l[41]-l[31]-l[0]-l[25]+l[33]+l[15]-l[1]-l[10]+l[16]-l[29]-l[12]+l[26]-l[39]-l[21]-l[18]-l[6]-l[40]-l[13]+l[8]+l[37]+l[19]+l[14]+l[32]+l[28]-l[11]+l[23]+l[36]+l[7]==117)
s.add(l[32]+l[16]+l[3]+l[11]+l[34]-l[31]+l[14]+l[25]+l[1]-l[30]-l[33]-l[40]-l[4]-l[29]+l[18]-l[27]+l[13]-l[19]-l[12]+l[23]-l[39]-l[41]-l[8]+l[22]-l[5]-l[38]-l[9]-l[37]+l[17]-l[36]+l[24]-l[21]+l[2]-l[26]+l[20]-l[7]+l[35]-l[0]==-313)
s.add(l[40]-l[1]+l[5]+l[7]+l[33]+l[29]+l[12]+l[38]-l[31]+l[2]+l[14]-l[35]-l[8]-l[24]-l[39]-l[9]-l[28]+l[23]-l[17]-l[22]-l[26]+l[32]-l[11]+l[4]-l[36]+l[10]+l[20]-l[18]-l[16]+l[6]-l[0]+l[3]-l[30]+l[37]-l[19]+l[21]+l[25]-l[15]==-42)
s.add(l[21]+l[26]-l[17]-l[25]+l[27]-l[22]-l[39]-l[23]-l[15]-l[20]-l[32]+l[12]+l[3]-l[6]+l[28]+l[31]+l[13]-l[16]-l[37]-l[30]-l[5]+l[41]+l[29]+l[36]+l[1]+l[11]+l[24]+l[18]-l[40]+l[19]-l[35]+l[2]-l[38]+l[14]-l[9]+l[4]+l[0]-l[33]==289)
s.add(l[29]+l[31]+l[32]-l[17]-l[7]+l[34]+l[2]+l[14]+l[23]-l[4]+l[3]+l[35]-l[33]-l[9]-l[20]-l[37]+l[24]-l[27]+l[36]+l[15]-l[18]-l[0]+l[12]+l[11]-l[38]+l[6]+l[22]+l[39]-l[25]-l[10]-l[19]-l[1]+l[13]-l[41]+l[30]-l[16]+l[28]-l[26]==-117)
s.add(l[5]+l[37]-l[39]+l[0]-l[27]+l[12]+l[41]-l[22]+l[8]-l[16]-l[38]+l[9]+l[15]-l[35]-l[29]+l[18]+l[6]-l[25]-l[28]+l[36]+l[34]+l[32]-l[14]-l[1]+l[20]+l[40]-l[19]-l[4]-l[7]+l[26]+l[30]-l[10]+l[13]-l[21]+l[2]-l[23]-l[3]-l[33]==-252)
s.add(l[29]+l[10]-l[41]-l[9]+l[12]-l[28]+l[11]+l[40]-l[27]-l[8]+l[32]-l[25]-l[23]+l[39]-l[1]-l[36]-l[15]+l[33]-l[20]+l[18]+l[22]-l[3]+l[6]-l[34]-l[21]+l[19]+l[26]+l[13]-l[4]+l[7]-l[37]+l[38]-l[2]-l[30]-l[0]-l[35]+l[5]+l[17]==-183)
s.add(l[6]-l[8]-l[20]+l[34]-l[33]-l[25]-l[4]+l[3]+l[17]-l[13]-l[15]-l[40]+l[1]-l[30]-l[14]-l[28]-l[35]+l[38]-l[22]+l[2]+l[24]-l[29]+l[5]+l[9]+l[37]+l[23]-l[18]+l[19]-l[21]+l[11]+l[36]+l[41]-l[7]-l[32]+l[10]+l[26]-l[0]+l[31]==188)
s.add(l[3]+l[6]-l[41]+l[10]+l[39]+l[37]+l[1]+l[8]+l[21]+l[24]+l[29]+l[12]+l[27]-l[38]+l[11]+l[23]+l[28]+l[33]-l[31]+l[14]-l[5]+l[32]-l[17]+l[40]-l[34]+l[20]-l[22]-l[16]+l[19]+l[2]-l[36]-l[7]+l[18]+l[15]+l[26]-l[0]-l[4]+l[35]==1036)
s.add(l[28]-l[33]+l[2]+l[37]-l[12]-l[9]-l[39]+l[16]-l[32]+l[8]-l[36]+l[31]+l[10]-l[4]+l[21]-l[25]+l[18]+l[24]-l[0]+l[29]-l[26]+l[35]-l[22]-l[41]-l[6]+l[15]+l[19]+l[40]+l[7]+l[34]+l[17]-l[3]-l[13]+l[5]+l[23]+l[11]-l[27]+l[1]==328)
s.add(l[22]-l[32]+l[17]-l[9]+l[20]-l[18]-l[34]+l[23]+l[36]-l[35]-l[38]+l[27]+l[4]-l[5]-l[41]+l[29]+l[33]+l[0]-l[37]+l[28]-l[40]-l[11]-l[12]+l[7]+l[1]+l[2]-l[26]-l[16]-l[8]+l[24]-l[25]+l[3]-l[6]-l[19]-l[39]-l[14]-l[31]+l[10]==-196)
s.add(l[11]+l[13]+l[14]-l[15]-l[29]-l[2]+l[7]+l[20]+l[30]-l[36]-l[33]-l[19]+l[31]+l[0]-l[39]-l[4]-l[6]+l[38]+l[35]-l[28]+l[34]-l[9]-l[23]-l[26]+l[37]-l[8]-l[27]+l[5]-l[41]+l[3]+l[17]+l[40]-l[10]+l[25]+l[12]-l[24]+l[18]+l[32]==7)
s.add(l[34]-l[37]-l[40]+l[4]-l[22]-l[31]-l[6]+l[38]+l[13]-l[28]+l[8]+l[30]-l[20]-l[7]-l[32]+l[26]+l[1]-l[18]+l[5]+l[35]-l[24]-l[41]+l[9]-l[0]-l[2]-l[15]-l[10]+l[12]-l[36]+l[33]-l[16]-l[14]-l[25]-l[29]-l[21]+l[27]+l[3]-l[17]==-945)
s.add(l[12]-l[30]-l[8]+l[20]-l[2]-l[36]-l[25]-l[0]-l[19]-l[28]-l[7]-l[11]-l[33]+l[4]-l[23]+l[10]-l[41]+l[39]-l[32]+l[27]+l[18]+l[15]+l[34]+l[13]-l[40]+l[29]-l[6]+l[37]-l[14]-l[16]+l[38]-l[26]+l[17]+l[31]-l[22]-l[35]+l[5]-l[1]==-480)
s.add(l[36]-l[11]-l[34]+l[8]+l[0]+l[15]+l[28]-l[39]-l[32]-l[2]-l[27]+l[22]+l[16]-l[30]-l[3]+l[31]-l[26]+l[20]+l[17]-l[29]-l[18]+l[19]-l[10]+l[6]-l[5]-l[38]-l[25]-l[24]+l[4]+l[23]+l[9]+l[14]+l[21]-l[37]+l[13]-l[41]-l[12]+l[35]==-213)
s.add(l[19]-l[36]-l[12]+l[33]-l[27]-l[37]-l[25]+l[38]+l[16]-l[18]+l[22]-l[39]+l[13]-l[7]-l[31]-l[26]+l[15]-l[10]-l[9]-l[2]-l[30]-l[11]+l[41]-l[4]+l[24]+l[34]+l[5]+l[17]+l[14]+l[6]+l[8]-l[21]-l[23]+l[32]-l[1]-l[29]-l[0]+l[3]==-386)
s.add(l[0]+l[7]-l[28]-l[38]+l[19]+l[31]-l[5]+l[24]-l[3]+l[33]-l[12]-l[29]+l[32]+l[1]-l[34]-l[9]-l[25]+l[26]-l[8]+l[4]-l[10]+l[40]-l[15]-l[11]-l[27]+l[36]+l[14]+l[41]-l[35]-l[13]-l[17]-l[21]-l[18]+l[39]-l[2]+l[20]-l[23]-l[22]==-349)
s.add(l[10]+l[22]+l[21]-l[0]+l[15]-l[6]+l[20]-l[29]-l[30]-l[33]+l[19]+l[23]-l[28]+l[41]-l[27]-l[12]-l[37]-l[32]+l[34]-l[36]+l[3]+l[1]-l[13]+l[18]+l[14]+l[9]+l[7]-l[39]+l[8]+l[2]-l[31]-l[5]-l[40]+l[38]-l[26]-l[4]+l[16]-l[25]==98)
s.add(l[28]+l[38]+l[20]+l[0]-l[5]-l[34]-l[41]+l[22]-l[26]+l[11]+l[29]+l[31]-l[3]-l[16]+l[23]+l[17]-l[18]+l[9]-l[4]-l[12]-l[19]-l[40]-l[27]+l[33]+l[8]-l[37]+l[2]+l[15]-l[24]-l[39]+l[10]+l[35]-l[1]+l[30]-l[36]-l[25]-l[14]-l[32]==-412)
s.add(l[1]-l[24]-l[29]+l[39]+l[41]+l[0]+l[9]-l[19]+l[6]-l[37]-l[22]+l[32]+l[21]+l[28]+l[36]+l[4]-l[17]+l[20]-l[13]-l[35]-l[5]+l[33]-l[27]-l[30]+l[40]+l[25]-l[18]+l[34]-l[3]-l[10]-l[16]-l[23]-l[38]+l[8]-l[14]-l[11]-l[7]+l[12]==-95)
s.add(l[2]-l[24]+l[31]+l[0]+l[9]-l[6]+l[7]-l[1]-l[22]+l[8]-l[23]+l[40]+l[20]-l[38]-l[11]-l[14]+l[18]-l[36]+l[15]-l[4]-l[41]-l[12]-l[34]+l[32]-l[35]+l[17]-l[21]-l[10]-l[29]+l[39]-l[16]+l[27]+l[26]-l[3]-l[5]+l[13]+l[25]-l[28]==-379)
s.add(l[19]-l[17]+l[31]+l[14]+l[6]-l[12]+l[16]-l[8]+l[27]-l[13]+l[41]+l[2]-l[7]+l[32]+l[1]+l[25]-l[9]+l[37]+l[34]-l[18]-l[40]-l[11]-l[10]+l[38]+l[21]+l[3]-l[0]+l[24]+l[15]+l[23]-l[20]+l[26]+l[22]-l[4]-l[28]-l[5]+l[39]+l[35]==861)
s.add(l[35]+l[36]-l[16]-l[26]-l[31]+l[0]+l[21]-l[13]+l[14]+l[39]+l[7]+l[4]+l[34]+l[38]+l[17]+l[22]+l[32]+l[5]+l[15]+l[8]-l[29]+l[40]+l[24]+l[6]+l[30]-l[2]+l[25]+l[23]+l[1]+l[12]+l[9]-l[10]-l[3]-l[19]+l[20]-l[37]-l[33]-l[18]==1169)
s.add(l[13]+l[0]-l[25]-l[32]-l[21]-l[34]-l[14]-l[9]-l[8]-l[15]-l[16]+l[38]-l[35]-l[30]-l[40]-l[12]+l[3]-l[19]+l[4]-l[41]+l[2]-l[36]+l[37]+l[17]-l[1]+l[26]-l[39]-l[10]-l[33]+l[5]-l[27]-l[23]-l[24]-l[7]+l[31]-l[28]-l[18]+l[6]==-1236)
s.add(l[20]+l[27]-l[29]-l[25]-l[3]+l[28]-l[32]-l[11]+l[10]+l[31]+l[16]+l[21]-l[7]+l[4]-l[24]-l[35]+l[26]+l[12]-l[37]+l[6]+l[23]+l[41]-l[39]-l[38]+l[40]-l[36]+l[8]-l[9]-l[5]-l[1]-l[13]-l[14]+l[19]+l[0]-l[34]-l[15]+l[17]+l[22]==-114)
s.add(l[12]-l[28]-l[13]-l[23]-l[33]+l[18]+l[10]+l[11]+l[2]-l[36]+l[41]-l[16]+l[39]+l[34]+l[32]+l[37]-l[38]+l[20]+l[6]+l[7]+l[31]+l[5]+l[22]-l[4]-l[15]-l[24]+l[17]-l[3]+l[1]-l[35]-l[9]+l[30]+l[25]-l[0]-l[8]-l[14]+l[26]+l[21]==659)
s.add(l[21]-l[3]+l[7]-l[27]+l[0]-l[32]-l[24]-l[37]+l[4]-l[22]+l[20]-l[5]-l[30]-l[31]-l[1]+l[15]+l[41]+l[12]+l[40]+l[38]-l[17]-l[39]+l[19]-l[13]+l[23]+l[18]-l[2]+l[6]-l[33]-l[9]+l[28]+l[8]-l[16]-l[10]-l[14]+l[34]+l[35]-l[11]==-430)
s.add(l[11]-l[23]-l[9]-l[19]+l[17]+l[38]-l[36]-l[22]-l[10]+l[27]-l[14]-l[4]+l[5]+l[31]+l[2]+l[0]-l[16]-l[8]-l[28]+l[3]+l[40]+l[25]-l[33]+l[13]-l[32]-l[35]+l[26]-l[20]-l[41]-l[30]-l[12]-l[7]+l[37]-l[39]+l[15]+l[18]-l[29]-l[21]==-513)
s.add(l[32]+l[19]+l[4]-l[13]-l[17]-l[30]+l[5]-l[33]-l[37]-l[15]-l[18]+l[7]+l[25]-l[14]+l[35]+l[40]+l[16]+l[1]+l[2]+l[26]-l[3]-l[39]-l[22]+l[23]-l[36]-l[27]-l[9]+l[6]-l[41]-l[0]-l[31]-l[20]+l[12]-l[8]+l[29]-l[11]-l[34]+l[21]==-502)
s.add(l[30]-l[31]-l[36]+l[3]+l[9]-l[40]-l[33]+l[25]+l[39]-l[26]+l[23]-l[0]-l[29]-l[32]-l[4]+l[37]+l[28]+l[21]+l[17]+l[2]+l[24]+l[6]+l[5]+l[8]+l[16]+l[27]+l[19]+l[12]+l[20]+l[41]-l[22]+l[15]-l[11]+l[34]-l[18]-l[38]+l[1]-l[14]==853)
s.add(l[38]-l[10]+l[16]+l[8]+l[21]-l[25]+l[36]-l[30]+l[31]-l[3]+l[5]-l[15]+l[23]-l[28]+l[7]+l[12]-l[29]+l[22]-l[0]-l[37]-l[14]-l[11]+l[32]+l[33]-l[9]+l[39]+l[41]-l[19]-l[1]+l[18]-l[4]-l[6]+l[13]+l[20]-l[2]-l[35]-l[26]+l[27]==-28)
s.add(l[11]+l[18]-l[26]+l[15]-l[14]-l[33]+l[7]-l[23]-l[25]+l[0]-l[6]-l[21]-l[16]+l[17]-l[19]-l[28]-l[38]-l[37]+l[9]+l[20]-l[8]-l[3]+l[22]-l[35]-l[10]-l[31]-l[2]+l[41]-l[1]-l[4]+l[24]-l[34]+l[39]+l[40]+l[32]-l[5]+l[36]-l[27]==-529)
s.add(l[38]+l[8]+l[36]+l[35]-l[23]-l[34]+l[13]-l[4]-l[27]-l[24]+l[26]+l[31]-l[30]-l[5]-l[40]+l[28]-l[11]-l[2]-l[39]+l[15]+l[10]-l[17]+l[3]+l[19]+l[22]+l[33]+l[0]+l[37]+l[16]-l[9]-l[32]+l[25]-l[21]-l[12]+l[6]-l[41]+l[20]-l[18]==-12)
s.add(l[6]-l[30]-l[20]-l[27]-l[14]-l[39]+l[41]-l[33]-l[0]+l[25]-l[32]-l[3]+l[26]-l[12]+l[8]-l[35]-l[24]+l[15]+l[9]-l[4]+l[13]+l[36]+l[34]+l[1]-l[28]-l[21]+l[18]+l[23]+l[29]-l[10]-l[38]+l[22]+l[37]+l[5]+l[19]+l[7]+l[16]-l[31]==81)

if s.check() == sat:
    m = s.model()
    for i in range(0x2a):
        print(chr(int("%s"%m[l[i]])), end='')

[CFI-CTF 2018]IntroToPE

.net逆向, dnSpy打开就看到一个base64串, 解一下就是flag

[2019红帽杯]childRE

flag长度32(包括’\0’)，输入经过sub_140001280和一个递归处理sub_1400015C0

跟进去sub_1400015C0发现是一个类似树的遍历过程，先左子然后右子，最后根，判定为后序遍历

针对treeroot_1是未赋值的变量，直接读汇编代码，这里人r10代表变量treeroot_1，和rax是同样的数值，所以其实treeroot_1就是treeroot，验证树的后序遍历完成

接着是第二个阶段的验证, 处理后字符串和硬编码数组的检验

直接shift+e导出数据, 写个爆破脚本

checklist = [   
    49,  50,  51,  52,  53,  54,  55,  56,  57,  48, 
    45,  61,  33,  64,  35,  36,  37,  94,  38,  42, 
    40,  41,  95,  43, 113, 119, 101, 114, 116, 121, 
    117, 105, 111, 112,  91,  93,  81,  87,  69,  82, 
    84,  89,  85,  73,  79,  80, 123, 125,  97, 115, 
    100, 102, 103, 104, 106, 107, 108,  59,  39,  65, 
    83,  68,  70,  71,  72,  74,  75,  76,  58,  34, 
    90,  88,  67,  86,  66,  78,  77,  60,  62,  63, 
    122, 120,  99, 118,  98, 110, 109,  44,  46,  47, 0
]

valid1 = [
    40,  95,  64,  52,  54,  50,  48,  33,  48,  56, 
    33,  54,  95,  48,  42,  48,  52,  52,  50,  33, 
    64,  49,  56,  54,  37,  37,  48,  64,  51,  61, 
    54,  54,  33,  33,  57,  55,  52,  42,  51,  50, 
    51,  52,  61,  38,  48,  94,  51,  38,  49,  64, 
    61,  38,  48,  57,  48,  56,  33,  54,  95,  48, 
    42,  38,   0
]

valid2 = [
    53,  53,  53,  54,  53,  54,  53,  51,  50,  53, 
    53,  53,  53,  50,  50,  50,  53,  53,  54,  53, 
    53,  54,  53,  53,  53,  53,  50,  52,  51,  52, 
    54,  54,  51,  51,  52,  54,  53,  51,  54,  54, 
    51,  53,  52,  52,  52,  50,  54,  53,  54,  53, 
    53,  53,  53,  53,  50,  53,  53,  53,  53,  50, 
    50,  50,   0
]

UnDecorateSymbolName = ''
for idx in range(62):
    for ch in range(128):
        if checklist[ch % 23] == valid1[idx] and checklist[ch // 23] == valid2[idx]:
            UnDecorateSymbolName += chr(ch)
            break

print(UnDecorateSymbolName)
# private: char * __thiscall R0Pxx::My_Aut0_PWN(unsigned char *)

去网上搜一下UnDecorateSymbolName函数, 写个正向程序体会, 输入一个带修饰的符号名字符串, 在outputString输出取消修饰后的符号名字符串

#include "stdafx.h"
#include 
#include 
#define WIN32_LEAN_AND_MEAN     // Exclude rarely-used stuff from Windows headers
#include 
#include 

#include "Dbghelp.h"
#pragma comment(lib, "Dbghelp.lib")

int main(int argc, char* argv[])
{
	DWORD dwRc = 0;
	const char* szDecoratedName = "?GetTypeString@@YAPBDK@Z";
	char szUnDecoratedName[MAXBYTE] = { '\0' };

	dwRc = UnDecorateSymbolName(szDecoratedName, szUnDecoratedName, sizeof(szUnDecoratedName), UNDNAME_COMPLETE);
	if (dwRc > 0) {
		//printf("%s => \r\n%s\r\n", szDecoratedName, szUnDecoratedName);
		printf("Undecorated Name: %s\n", szUnDecoratedName);
	}
	else {
		printf("undecorating name failed : %s\r\n", szDecoratedName);
	}

	/** run result
	?GetTypeString@@YAPBDK@Z =>
	char const * __cdecl GetTypeString(unsigned long)
	*/
	system("pause");
	return 0;
}

找一下从无修饰符号名还原带修饰字符串的方法, 参考链接
或者直接写个程序打印其对应的__FUNCDNAME__

#include "stdafx.h"
#include 
#include 
#include 


// private: char * __thiscall R0Pxx::My_Aut0_PWN(unsigned char *)
class R0Pxx {
public:
	ROPxx(){};

	char * __thiscall call_my_auto_pwn() {
		unsigned char tmp[] = "let's see";
		char * res;
		res = My_Aut0_PWN(tmp);
		return res;
	}

private: 
	char * __thiscall My_Aut0_PWN(unsigned char * para) {
		std::cout << __FUNCDNAME__ << std::endl;
		return (char*)0;
	}
};

int main(int argc, char* argv[])
{
	ROPxx x;
	x.call_my_auto_pwn();

	system("pause");
	return 0;
}

// ?My_Aut0_PWN@R0Pxx@@AAEPADPAE@Z

根据满二叉树的后序遍历, 重构二叉树然后按层序遍历获得正确input (这里可以人工)
或者采用动态调试方法, 找到原本input的下标, 然后通过置换找回input. 输入"ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_", debug得到每次v5的赋值, 置换的下标可以通过 -ord(‘A’) 获得, 将后序遍历得到的 ?My_Aut0_PWN@ROPxx@@AAEPADPAE@Z 置换回去即是input

重复31轮拿到置换表, 逆

import hashlib

table = [0x50, 0x51, 0x48, 0x52, 0x53, 0x49, 0x44, 0x54, 0x55, 0x4a,
         0x56, 0x57, 0x4b, 0x45, 0x42, 0x58, 0x59, 0x4c, 0x5a, 0x5b, 
         0x4d, 0x46, 0x5c, 0x5d, 0x4e, 0x5e, 0x5f, 0x4f, 0x47, 0x43, 0x41]

DecoratedName = '?My_Aut0_PWN@R0Pxx@@AAEPADPAE@Z'
# tmp = [0 for _ in range(len(table))]
tmp = list(DecoratedName)
# print(len(table), len(DecoratedName), len(tmp), tmp)

for i in range(len(table)):
    index = table[i] - 65
    tmp[index] = DecoratedName[i]

flag = ''.join(tmp)
print(flag)
md5obj = hashlib.md5()
md5obj.update(flag.encode(encoding='utf-8'))
flag = md5obj.hexdigest()
print('flag{' + flag + '}')