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[原创]KCTF 第二题 星际生物
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发表于: 2024-8-17 02:46 1535
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1.ILSpy 反编译
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | // brain, Version=1.0.8991.31927, Culture=neutral, PublicKeyToken=null// <Module>using System.Runtime.CompilerServices;using <CppImplementationDetails>;internal unsafe static int main(){ //IL_0032: Expected I, but got I8 //IL_00ed: Expected I, but got I8 //IL_0101: Expected I, but got I8 //IL_0215: Expected I, but got I8 //IL_0174: Expected I, but got I8 //IL_01fe: Expected I, but got I8 System.Runtime.CompilerServices.Unsafe.SkipInit(out $ArrayType$$$BY0BAA@D $ArrayType$$$BY0BAA@D); // IL initblk instruction System.Runtime.CompilerServices.Unsafe.InitBlock(ref $ArrayType$$$BY0BAA@D, 0, 256); printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0BJ@MNCFGMHN@Please?5input?5your?5flag?3?5?$AA@), __arglist()); scanf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_05HPMPOKFN@?$CF?$FL?$FO?6?$FN?$AA@), __arglist((sbyte*)(&$ArrayType$$$BY0BAA@D))); sbyte* ptr = (sbyte*)(&$ArrayType$$$BY0BAA@D); if (*(bool*)(&$ArrayType$$$BY0BAA@D)) { do { ptr = (sbyte*)((ulong)(nint)ptr + 1uL); } while (*ptr != 0); } if ((uint)((ref *(?*)ptr) - (ref *(?*)(&$ArrayType$$$BY0BAA@D))) != 70) { printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; } if (*(sbyte*)(&$ArrayType$$$BY0BAA@D) == 102 && System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY0BAA@D, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 1)) == 108 && System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY0BAA@D, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 2)) == 97 && System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY0BAA@D, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 3)) == 103 && System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY0BAA@D, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 4)) == 123 && System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY0BAA@D, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 69)) == 125) { System.Runtime.CompilerServices.Unsafe.SkipInit(out $ArrayType$$$BY0EA@E $ArrayType$$$BY0EA@E); // IL cpblk instruction System.Runtime.CompilerServices.Unsafe.CopyBlockUnaligned(ref $ArrayType$$$BY0EA@E, ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY0BAA@D, 5), 64); uint num = 0u; uint num2 = 0u; $ArrayType$$$BY188E* ptr2 = ($ArrayType$$$BY188E*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref sudoku); do { uint num3 = 0u; $ArrayType$$$BY188E* ptr3 = ptr2; do { if (*(byte*)ptr3 == 15) { byte b = *(byte*)((ref *(?*)num) + (ref *(?*)(&$ArrayType$$$BY0EA@E))); if ((uint)b < 48u || (uint)b > 57u) { printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; } *(sbyte*)ptr3 = (sbyte)(b - 48); num++; } num3++; ptr3 = ($ArrayType$$$BY188E*)((ulong)(nint)ptr3 + 1uL); } while (num3 < 9); num2++; ptr2 = ($ArrayType$$$BY188E*)((ulong)(nint)ptr2 + 9uL); } while (num2 < 9); uint num4 = 1u; uint num5 = 1u; uint num6 = 0u; long num7 = 0L; while (num4 == 1) { long num8 = 0L; uint num9 = 1u; while (num4 == 1) { uint num10 = num9; if (num9 < 9) { long num11 = num9; byte b2 = *(byte*)((ref *(?*)(num7 + num8)) + (ref System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY188E, ?>(ref sudoku))); num4 = 1u; $ArrayType$$$BY188E* ptr4 = ($ArrayType$$$BY188E*)((ref *(?*)(num7 + num11)) + (ref System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY188E, ?>(ref sudoku))); do { if (b2 != *(byte*)ptr4) { num10++; ptr4 = ($ArrayType$$$BY188E*)((ulong)(nint)ptr4 + 1uL); continue; } num4 = 0u; break; } while (num10 < 9); } num9++; num8++; if (num9 - 1 >= 9) { break; } } num6++; num7 += 9; if (num6 >= 9) { break; } } uint num12 = 0u; long num13 = 0L; while (num5 == 1) { uint num14 = 1u; $ArrayType$$$BY188E* ptr5 = ($ArrayType$$$BY188E*)((ref *(?*)num13) + (ref System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY188E, ?>(ref sudoku))); while (num5 == 1) { uint num15 = num14; if (num14 < 9) { long num16 = num14; byte b3 = *(byte*)ptr5; num5 = 1u; $ArrayType$$$BY188E* ptr6 = ($ArrayType$$$BY188E*)((ref *(?*)(num16 * 9 + num13)) + (ref System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY188E, ?>(ref sudoku))); do { if (b3 != *(byte*)ptr6) { num15++; ptr6 = ($ArrayType$$$BY188E*)((ulong)(nint)ptr6 + 9uL); continue; } num5 = 0u; break; } while (num15 < 9); } num14++; ptr5 = ($ArrayType$$$BY188E*)((ulong)(nint)ptr5 + 9uL); if (num14 - 1 >= 9) { break; } } num12++; num13++; if (num12 >= 9) { break; } } if (num4 == 1 && num5 == 1) { System.Runtime.CompilerServices.Unsafe.SkipInit(out $ArrayType$$$BY133E $ArrayType$$$BY133E); *(sbyte*)(&$ArrayType$$$BY133E) = 33; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 1)) = 45; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 2)) = 63; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 3)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 4)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 5)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 6)) = 45; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 7)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 8)) = 45; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 9)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 10)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 11)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 12)) = 43; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 13)) = 45; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 14)) = 45; System.Runtime.CompilerServices.Unsafe.As<$ArrayType$$$BY133E, sbyte>(ref System.Runtime.CompilerServices.Unsafe.AddByteOffset(ref $ArrayType$$$BY133E, 15)) = 43; byte b4 = 0; byte b5 = 0; uint num17 = 0u; do { int num18 = *(byte*)((ref *(?*)num) + (ref *(?*)(&$ArrayType$$$BY0EA@E))); num++; switch (num18) { case 87: if (b4 != 0) { b4--; goto default; } printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; case 83: if (b4 != 3) { b4++; goto default; } printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; case 68: if (b5 != 3) { b5++; goto default; } printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; case 65: if (b5 != 0) { b5--; goto default; } printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; default: if (System.Runtime.CompilerServices.Unsafe.Add(ref *(byte*)((ref *(?*)b5) + (ref *(?*)(&$ArrayType$$$BY133E))), (long)b4 * 4L) == 45) { printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1; } break; } num17++; } while (num17 < 8); if (System.Runtime.CompilerServices.Unsafe.Add(ref *(byte*)((ref *(?*)b5) + (ref *(?*)(&$ArrayType$$$BY133E))), (long)b4 * 4L) == 63) { printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0BB@MGPKLNCH@You?5are?5winner?$CB?6?$AA@), __arglist()); return 0; } } } printf((sbyte*)System.Runtime.CompilerServices.Unsafe.AsPointer(ref ??_C@_0M@IIPHMAMA@Try?5again?$CB?6?$AA@), __arglist()); return -1;} |
2.0
sudoku变量名提示数独
查看sudoku是一个9X9的表格
查看程序逻辑就是将flag在sudoku的0xf处的填入数组
然后检查每一列每一行是否重复
最后是一个迷宫4X4的，肉眼可解
最后将转换的数字按次序排列+迷宫的WASD序列就是最后的flag
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