文章目錄

• numgame
• • 拖進(jìn)ida
  • `set_sudu((Sudu *)v8, (const std::string *)v9) != 1`
  • • int __userpurge Sudu::set_number@(int a1@, Sudu *this, int a3, int a4, int a5)
  • (unsigned __int8)Sudu::check((Sudu *)v8)
  • • (unsigned __int8)Sudu::check_block((int)a1)
    • (unsigned __int8)Sudu::check_col((int)a1)
    • (unsigned __int8)Sudu::check_row((int)a1)
  • 總結(jié)：
  • • 滿(mǎn)足條件：
  • 代碼
  • 注意
• apk crack
• • 查殼
  • so層分析
  • jeb分析
  • • main函數(shù)
    • check函數(shù)
  • jeb動(dòng)調(diào)apk
• 溯源
• • 拖進(jìn)ida
  • 正向解析
  • 逆向腳本

numgame

拖進(jìn)ida

char v8[324];

這個(gè)也就是81個(gè)int數(shù)據(jù)的數(shù)組，_data_start__這個(gè)是有已知數(shù)獨(dú)數(shù)據(jù)所在的81個(gè)int類(lèi)型的數(shù)組（即9X9）

set_sudu((Sudu *)v8, (const std::string *)v9) != 1

int __cdecl set_sudu(Sudu *a1, const std::string *a2) {std::string *v3; // [esp+0h] [ebp-38h]std::string *v4; // [esp+0h] [ebp-38h]int v5; // [esp+Ch] [ebp-2Ch]int v6; // [esp+1Ch] [ebp-1Ch] BYREFint v7; // [esp+20h] [ebp-18h] BYREFchar v8; // [esp+27h] [ebp-11h]const std::string *v9; // [esp+28h] [ebp-10h]int v10; // [esp+2Ch] [ebp-Ch]v10 = 0;v9 = a2;v7 = std::string::begin(v3);v6 = std::string::end(v4);while ( __gnu_cxx::operator!=<char const*,std::string>((int)&v7, (int)&v6) ){v8 = *(_BYTE *)__gnu_cxx::__normal_iterator<char const*,std::string>::operator*((int)&v7);if ( (unsigned __int8)Sudu::set_number((int)a1, (Sudu *)(v10 / 9), v10 % 9, v8 - 48, v5) != 1 )return 0;++v10;__gnu_cxx::__normal_iterator<char const*,std::string>::operator++(&v7);}return 1; }

核心函數(shù)Sudu::set_number
這里v10/9也就是當(dāng)前行數(shù)，v10%9也就是當(dāng)前列數(shù)（代表有九列），v8 - 48代表字符變量轉(zhuǎn)換為數(shù)字變量，

int __userpurge Sudu::set_number@(int a1@, Sudu *this, int a3, int a4, int a5)

int __userpurge Sudu::set_number@<eax>(int a1@<ecx>, Sudu *this, int a3, int a4, int a5) {if ( !a4 )return 1;if ( (int)this < 0|| (int)this > 8|| a3 < 0|| a3 > 8|| *(_DWORD *)(a1 + 4 * (a3 + 9 * (_DWORD)this))|| a4 <= 0|| a4 > 9 ){return 0;}*(_DWORD *)(a1 + 4 * (9 * (_DWORD)this + a3)) = a4;return 1; }

字符填充*(_DWORD *)(a1 + 4 * (9 * (_DWORD)this + a3)) = a4;，this也就是行數(shù)嘍，a3列數(shù)嘍，然后int類(lèi)型變量*4，a1就是起始地址。分析完成

(unsigned __int8)Sudu::check((Sudu *)v8)

BOOL __fastcall Sudu::check(Sudu *a1) {return (unsigned __int8)Sudu::check_block((int)a1)&& (unsigned __int8)Sudu::check_col((int)a1)&& (unsigned __int8)Sudu::check_row((int)a1); }

(unsigned __int8)Sudu::check_block((int)a1)

int __fastcall Sudu::check_block(int a1) {char v2[10]; // [esp+12h] [ebp-26h]int v3; // [esp+1Ch] [ebp-1Ch]int v4; // [esp+20h] [ebp-18h]int l; // [esp+24h] [ebp-14h]int k; // [esp+28h] [ebp-10h]int j; // [esp+2Ch] [ebp-Ch]int i; // [esp+30h] [ebp-8h]for ( i = 0; i <= 8; ++i ){for ( j = 1; j <= 9; ++j )v2[j] = 1;for ( k = 0; k <= 8; ++k ){v4 = 3 * (i / 3) + k / 3;v3 = 3 * (i % 3) + k % 3;v2[*(_DWORD *)(a1 + 4 * (v3 + 9 * v4))] = 0;}for ( l = 1; l <= 9; ++l ){if ( v2[l] )return 0;}}

核心代碼為：

v4 = 3 * (i / 3) + k / 3;v3 = 3 * (i % 3) + k % 3;v2[*(_DWORD *)(a1 + 4 * (v3 + 9 * v4))] = 0;

下標(biāo)值*(_DWORD *)(a1 + 4 * (v3 + 9 * v4))三個(gè)為一組，分組進(jìn)行提取，提取的時(shí)候，先提取前三行的前三個(gè)下標(biāo)，把每一行的前三個(gè)下標(biāo)提取后；再提取前三行的中間三個(gè)下標(biāo)；緊接著是前三行最后三個(gè)下標(biāo)。
然后中間三行，最后最后三行.(也就是把大正方形劃分成了9個(gè)小正方形)

(unsigned __int8)Sudu::check_col((int)a1)

int __fastcall Sudu::check_col(int a1) {char v2[10]; // [esp+Ah] [ebp-1Ah]int l; // [esp+14h] [ebp-10h]int k; // [esp+18h] [ebp-Ch]int j; // [esp+1Ch] [ebp-8h]int i; // [esp+20h] [ebp-4h]for ( i = 0; i <= 8; ++i ){for ( j = 1; j <= 9; ++j )v2[j] = 1;for ( k = 0; k <= 8; ++k )v2[*(_DWORD *)(a1 + 4 * (i + 9 * k))] = 0;for ( l = 1; l <= 9; ++l ){if ( v2[l] )return 0;}}return 1; }

核心代碼：

v2[*(_DWORD *)(a1 + 4 * (i + 9 * k))] = 0;

按列進(jìn)行賦值

(unsigned __int8)Sudu::check_row((int)a1)

int __fastcall Sudu::check_row(int a1) {char v2[10]; // [esp+Ah] [ebp-1Ah]int l; // [esp+14h] [ebp-10h]int k; // [esp+18h] [ebp-Ch]int j; // [esp+1Ch] [ebp-8h]int i; // [esp+20h] [ebp-4h]for ( i = 0; i <= 8; ++i ){for ( j = 1; j <= 9; ++j )v2[j] = 1;for ( k = 0; k <= 8; ++k )v2[*(_DWORD *)(a1 + 4 * (k + 9 * i))] = 0;for ( l = 1; l <= 9; ++l ){if ( v2[l] )return 0;}}return 1; }

按行進(jìn)行賦值

總結(jié)：

滿(mǎn)足條件：

9個(gè)小正方形里面都有1~9

大正方形的每行都有1~9

大正方形的每列都有1~9

搞了半天就是個(gè)數(shù)獨(dú)

代碼

在線解數(shù)獨(dú)：http://shudu.gwalker.cn/

flag{347589162528416937916237458261875349739164825854392716493658271175923684682741593}

注意

需要把原來(lái)有數(shù)字的位置換為0，原因這里：為了防止*(a1 + 4 * (a3+9*this))成立,


a3為下標(biāo)，舉例也就是2，此時(shí)直接不滿(mǎn)足。如果在上面a4的值為0的話(huà)，那么么直接返回1，也就不用進(jìn)行下一步的判斷了：

if ( !a4 )return 1;

這里的a4也就是輸入的數(shù)值

flag{340089102508406930016207058060875349709064820854392006093650071170023604602740590}

apk crack

查殼

so層分析

虛晃一槍

jeb分析

main函數(shù)

if(new simple(v3).check()) {((TextView)v2).setText(P_ichunqiu.A);}else {((TextView)v2).setText(P_ichunqiu.B);}

check函數(shù)

simple類(lèi)中check函數(shù)是主要：

public class simple {private byte[] A;private byte[] B;public simple(String arg5) {int v3 = 50;super();this.A = new byte[v3];this.B = arg5.getBytes();int v0;for(v0 = 0; v0 < this.B.length; ++v0) {this.A[v0] = this.B[v0];}this.B = new byte[v3];}public boolean check() {byte v11 = 57;byte v9 = 0x30;byte[] v2 = new byte[203];v2[0] = 0x2F;v2[1] = v9;v2[2] = 81;v2[3] = 82;v2[4] = 0x4F;v2[5] = 54;v2[6] = 77;v2[7] = v9;v2[8] = 50;v2[9] = v9;v2[10] = v9;v2[11] = 0x2F;v2[12] = v9;v2[13] = 65;v2[14] = 54;v2[15] = 77;v2[16] = v9;v2[17] = 50;v2[18] = v9;v2[19] = v9;v2[20] = 0x2F;v2[21] = v11;v2[22] = v11;v2[23] = 70;v2[24] = v9;v2[25] = 0x2F;v2[26] = 49;v2[27] = v9;v2[28] = 56;v2[29] = 70;v2[30] = 49;v2[0x1F] = 0x2F;v2[0x20] = 49;v2[33] = 49;v2[34] = 49;v2[35] = 70;v2[36] = 50;v2[37] = 0x2F;v2[38] = 53;v2[39] = 51;v2[40] = 70;v2[41] = 51;v2[42] = 0x2F;v2[43] = 49;v2[44] = v9;v2[45] = 49;v2[46] = 70;v2[0x2F] = 52;v2[v9] = 0x2F;v2[49] = 49;v2[50] = 49;v2[51] = 52;v2[52] = 70;v2[53] = 53;v2[54] = 0x2F;v2[55] = v9;v2[56] = 70;v2[v11] = 54;v2[58] = 0x4F;v2[59] = v9;v2[60] = 71;v2[61] = v9;v2[62] = 77;v2[0x3F] = v9;v2[0x40] = v9;v2[65] = 50;v2[66] = v9;v2[67] = v9;v2[68] = 65;v2[69] = v9;v2[70] = 68;v2[71] = v9;v2[72] = 77;v2[73] = v9;v2[74] = v9;v2[75] = 50;v2[76] = v9;v2[77] = v9;v2[78] = 0x4F;v2[0x4F] = 49;v2[80] = 71;v2[81] = 49;v2[82] = 77;v2[83] = v9;v2[84] = v9;v2[85] = 50;v2[86] = v9;v2[87] = v9;v2[88] = 65;v2[89] = 49;v2[90] = 68;v2[91] = 49;v2[92] = 77;v2[93] = v9;v2[94] = v9;v2[0x5F] = 50;v2[0x60] = v9;v2[97] = v9;v2[98] = 0x4F;v2[99] = 50;v2[100] = 71;v2[101] = 50;v2[102] = 77;v2[103] = v9;v2[104] = v9;v2[105] = 50;v2[106] = v9;v2[107] = v9;v2[108] = 65;v2[109] = 50;v2[110] = 68;v2[0x6F] = 50;v2[0x70] = 77;v2[0x71] = v9;v2[0x72] = v9;v2[0x73] = 50;v2[0x74] = v9;v2[0x75] = v9;v2[0x76] = 0x4F;v2[0x77] = 51;v2[120] = 71;v2[0x79] = 51;v2[0x7A] = 77;v2[0x7B] = v9;v2[0x7C] = v9;v2[0x7D] = 50;v2[0x7E] = v9;v2[0x7F] = v9;v2[0x80] = 65;v2[0x81] = 51;v2[130] = 68;v2[0x83] = 51;v2[0x84] = 77;v2[0x85] = v9;v2[0x86] = v9;v2[0x87] = 50;v2[0x88] = v9;v2[0x89] = v9;v2[0x8A] = 0x4F;v2[0x8B] = 52;v2[140] = 71;v2[0x8D] = 52;v2[0x8E] = 77;v2[0x8F] = v9;v2[0x90] = v9;v2[0x91] = 50;v2[0x92] = v9;v2[0x93] = v9;v2[0x94] = 65;v2[0x95] = 52;v2[150] = 68;v2[0x97] = 52;v2[0x98] = 77;v2[0x99] = v9;v2[0x9A] = v9;v2[0x9B] = 50;v2[0x9C] = v9;v2[0x9D] = v9;v2[0x9E] = 0x4F;v2[0x9F] = 53;v2[0xA0] = 71;v2[0xA1] = 53;v2[0xA2] = 77;v2[0xA3] = v9;v2[0xA4] = v9;v2[0xA5] = 50;v2[0xA6] = v9;v2[0xA7] = v9;v2[0xA8] = 65;v2[0xA9] = 53;v2[170] = 68;v2[0xAB] = 53;v2[0xAC] = 77;v2[0xAD] = v9;v2[0xAE] = v9;v2[0xAF] = 50;v2[0xB0] = v9;v2[0xB1] = v9;v2[0xB2] = 0x2F;v2[0xB3] = 49;v2[200] = 0x2F;v2[201] = v9;int v3 = 0;byte v0 = 0;byte v1 = 0;byte[] v5 = new byte[1000];int v4 = 0;int v6;for(v6 = 0; true; v6 = 0) {label_441:switch(v2[v3]) {case 0: {goto label_700;}case 47: {goto label_686;}case 65: {goto label_543;}case 66: {goto label_654;}case 67: {goto label_648;}case 68: {goto label_573;}case 69: {goto label_451;}case 70: {goto label_588;}case 71: {goto label_603;}case 72: {goto label_618;}case 73: {goto label_499;}case 74: {goto label_633;}case 75: {goto label_636;}case 76: {goto label_639;}case 77: {goto label_671;}case 78: {goto label_657;}case 79: {goto label_513;}case 80: {goto label_528;}case 81: {goto label_445;}case 82: {goto label_454;}case 83: {goto label_558;}case 84: {goto label_457;}case 85: {goto label_485;}case 86: {goto label_651;}case 87: {goto label_448;}case 88: {goto label_645;}case 89: {goto label_471;}case 90: {goto label_642;}}goto label_443;do {label_485:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v1 = v5[v6];v6 = 0;goto label_443;do {label_618:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);this.B[v6] = v1;v6 = 0;goto label_443;do {label_558:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);this.A[v6] = v1;v6 = 0;goto label_443;do {label_686:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v0 = ((byte)v6);v6 = 0;goto label_443;do {label_499:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v5[v6] = v1;v6 = 0;goto label_443;label_633:v0 = ((byte)(v0 ^ v1));goto label_443;label_700:boolean v7 = v0 != 0 ? true : false;return v7;label_636:v0 = ((byte)(v0 | v1));goto label_443;do {label_573:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v0 = this.B[v6];v6 = 0;goto label_443;label_445:v5[v4] = v0;++v4;goto label_443;label_639:v0 = ((byte)(v0 & v1));goto label_443;label_448:--v4;v0 = v5[v4];goto label_443;do {label_513:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v0 = this.A[v6];v6 = 0;goto label_443;label_642:v0 = ((byte)(v0 ^ -1));goto label_443;label_451:v5[v4] = v1;++v4;goto label_443;label_645:v0 = ((byte)(v0 + v1));goto label_443;label_454:--v4;v1 = v5[v4];goto label_443;label_648:v0 = ((byte)(v0 - v1));goto label_443;do {label_457:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v0 = v5[v6];v6 = 0;goto label_443;label_651:v0 = ((byte)(v0 * v1));goto label_443;do {label_588:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);this.B[v6] = v0;v6 = 0;goto label_443;label_654:v0 = ((byte)(v0 / v1));goto label_443;do {label_528:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);this.A[v6] = v0;v6 = 0;goto label_443;do {label_657:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v3 = v6;}do {label_471:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v5[v6] = v0;v6 = 0;goto label_443;do {label_603:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v1 = this.B[v6];v6 = 0;goto label_443;do {label_543:++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v1 = this.A[v6];v6 = 0;goto label_443;label_671:if(v0 < v1) {do {++v3;v6 = v2[v3] + v6 * 10 - 0x30;if(v2[v3 + 1] > v11) {break;}}while(v2[v3 + 1] >= v9);v3 = v6;v6 = 0;goto label_441;}label_443:++v3;goto label_441;} }

jeb動(dòng)調(diào)apk

溯源

拖進(jìn)ida

int __cdecl main(int argc, const char **argv, const char **envp) {int v3; // eaxint v4; // ecxint v5; // eaxint v6; // ebxint v7; // eaxint v8; // ediunsigned int v9; // ecxunsigned int v10; // edxint v11; // esiint v12; // eax_DWORD *v13; // ediint v14; // ecxint v15; // esivoid *v16; // esiint v17; // eaxint v18; // ebxconst char *v19; // edxint v20; // eaxvoid *v21; // ecxvoid *v22; // eaxint v24; // [esp+10h] [ebp-1008h]int v25; // [esp+14h] [ebp-1004h]int v26; // [esp+18h] [ebp-1000h] BYREFvoid *Block; // [esp+1Ch] [ebp-FFCh]int v28; // [esp+20h] [ebp-FF8h]int v29; // [esp+24h] [ebp-FF4h]int i; // [esp+28h] [ebp-FF0h]int v31; // [esp+2Ch] [ebp-FECh]void *v32[5]; // [esp+30h] [ebp-FE8h] BYREFunsigned int v33; // [esp+44h] [ebp-FD4h]char v34[4000]; // [esp+48h] [ebp-FD0h] BYREF__int128 v35[2]; // [esp+FE8h] [ebp-30h]int v36; // [esp+1014h] [ebp-4h]v3 = sub_5A1A30(std::cout, "please input key:");std::ostream::operator<<(v3, sub_5A1C60);v32[4] = 0;v33 = 15;LOBYTE(v32[0]) = 0;v36 = 0;sub_5A1D90(std::cin, v32); // 輸入數(shù)據(jù)sub_5A1300(v32, (int)v34);sub_5A1120(&v26, (int)v34, v4);v5 = 999;LOBYTE(v36) = 1;v6 = v26;for ( i = 999; i >= 0; --i ){v7 = (unsigned __int8)byte_5A3230[v5]; // 取出數(shù)組元素v8 = 4;v31 = 4;do{v9 = v7 & 3; // 取出數(shù)組元素低二位v9v24 = v7 >> 2; // 取出數(shù)組元素高六位v24v10 = 5 - v9;v35[0] = *(_OWORD *)&dword_5A3660;if ( v9 < 2 ) // 如果數(shù)組元素低二位小于2（即0和1）v10 = 1 - v9;v35[1] = *(_OWORD *)&word_5A3620;v11 = v28 + *((_DWORD *)v35 + 2 * v10); // v35=[0,1,0,ff,1,0,ff,0]v12 = v29 + *((_DWORD *)v35 + 2 * v10 + 1);v25 = v11;if ( v11 >= 0 && v11 < v6 && v12 >= 0 && v12 < v6 )// 進(jìn)行v11和v12的判斷，這里v6是一個(gè)固定值A(chǔ){v13 = (char *)Block + 4 * v29 + 4 * v28 * v6;// v13=x*10+yv14 = v12 + v11 * v6; // v14=y0+x0*10v15 = *((_DWORD *)Block + v14);*((_DWORD *)Block + v14) = *v13; // v14和v13進(jìn)行交換，v15作為temp*v13 = v15;v8 = v31; // v8和v31進(jìn)行配合，進(jìn)行遞減v28 = v25; // v11賦值給v28，進(jìn)行偏移賦值v29 = v12; // v12賦值給v29，進(jìn)行偏移賦值}v7 = v24; // 把右移的值賦給v7，以便下一次右移v31 = --v8;}while ( v8 );v5 = i - 1;}v16 = Block;v17 = 0;v18 = v6 * v6;if ( v18 <= 0 ){ LABEL_15:v19 = "success";}else{while ( *((_DWORD *)Block + v17) == v17 ){if ( ++v17 >= v18 )goto LABEL_15;}v19 = "fail";}v20 = sub_5A1A30(std::cout, v19);std::ostream::operator<<(v20, sub_5A1C60);j_j_free(v16);if ( v33 >= 0x10 ){v21 = v32[0];if ( v33 + 1 >= 0x1000 ){if ( ((int)v32[0] & 0x1F) != 0 )invalid_parameter_noinfo_noreturn();v22 = (void *)*((_DWORD *)v32[0] - 1);if ( v22 >= v32[0] )invalid_parameter_noinfo_noreturn();if ( (unsigned int)(v32[0] - v22) < 4 )invalid_parameter_noinfo_noreturn();if ( (unsigned int)(v32[0] - v22) > 0x23 )invalid_parameter_noinfo_noreturn();v21 = (void *)*((_DWORD *)v32[0] - 1);}

正向解析

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0x9C, 0x7D, 0x5B, 0x9A, ] v35=[0,1,0,-1,1,0,-1,0] b=[0,0,0,0] def test(l):x=0y=0for i in a[::-1]:for j in range(4):i=i//4b=i&3if(c<2):v10=1-belse:v10=5-bx0=x+v35[2*v10]y0=y+v35[2*v10+1]if(x0<0 or x0>=10 or y0<0 or y0>=10):continueelse:change(l,x*10+y,x0*10+y0)log.append([x*10+y,x0*10+y0])x=x0y=y0

逆向腳本

總結(jié)

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