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[原创]看雪CTF.TSRC 2018 团队赛 第五题 交响曲 wp
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发表于: 2018-12-9 15:40 2904
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JEB 撸出源码：
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | public class CrackMe extends AppCompatActivity { int[] a; int[] b; int[] c; int[] d; int e_day; int f_month; int g_year; int h; int i; int j; int k; String[] l; String[] m; TextView n; public CrackMe() { super(); this.a = new int[]{16, 6, 7, 10, 9, 16, 10, 8, 8, 9, 6, 6}; this.b = new int[]{5, 10, 8, 15, 16, 15, 8, 16, 8, 16, 9, 17, 8, 17, 10, 8, 9, 18, 5, 15, 10, 9, 8, 9, 15, 18, 7, 8, 16, 6}; this.c = new int[]{6, 7, 18, 9, 5, 16, 9, 15, 18, 8, 9, 5}; this.d = new int[]{7, 7, 9, 12, 8, 7, 13, 5, 14, 5, 9, 17, 5, 7, 12, 8, 8, 6, 19, 6, 8, 16, 10, 6, 12, 9, 6, 7, 12, 5, 9, 8, 7, 8, 15, 9, 16, 8, 8, 19, 12, 6, 8, 7, 5, 15, 6, 16, 15, 7, 9, 12, 10, 7, 15, 6, 5, 14, 14, 9}; this.l = new String[73]; this.m = new String[]{"23to01", "01to03", "03to05", "05to07", "07to09", "09to11", "11to13", "13to15", "15to17", "17to19", "19to21", "21to23"}; } private void a() { int v0 = 2131427370; try { this.c(); if(this.j != 0 && this.i != 0 && this.h != 0) { this.d(); this.a(this.e() + this.f() + this.g() + this.h()); return; } this.n.setText(this.getString(v0)); } catch(Exception ) { this.n.setText(this.getString(v0)); } } private void a(int arg8) { int v0 = 2131427370; int v1 = 34; if(arg8 <= v1) { if(arg8 < v1) { } else { try { this.n.setText(String.format("%s%s", this.getString(2131427369), this.l[arg8])); this.findViewById(2131165273).setEnabled(false); return; label_23: this.n.setText(this.getString(v0)); } catch(Exception ) { this.n.setText(this.getString(v0)); } return; } } goto label_23; } static void a(CrackMe arg0) { arg0.a(); } private void b() { int v0; for(v0 = 0; v0 <= 72; ++v0) { this.l[v0] = v0 != 34 ? this.getResources().getString(2131427374) : this.getResources().getString(2131427375); } } private void c() { int v0 = 2131165227; try { String v0_1 = this.findViewById(v0).getText().toString(); this.j = 0; this.i = 0; this.h = 0; int v3 = 4; String v2 = v0_1.length() > v3 ? v0_1.substring(0, v3) : v0_1; this.j = Integer.parseInt(v2); if(this.j > 0 && this.j < 189) { this.j = 0; } if(this.j <= 1983 || this.j >= 2007) { this.j = 0; } int v4 = 6; v2 = v0_1.length() > v4 ? v0_1.substring(v3, v4) : v0_1; this.i = Integer.parseInt(v2); if(this.i < 1 || this.i > 12) { this.i = 0; } int v5 = 8; if(v0_1.length() > v5) { v0_1 = v0_1.substring(v4, v5); } this.h = Integer.parseInt(v0_1); if(this.h >= 1 && this.h <= 31) { return; } this.h = 0; } catch(Exception ) { this.n.setText(this.getString(2131427370)); } } private void d() { try { if(this.j == 1989 || this.j == 2004) { this.h = 31; } if(this.i == 1 || this.i == 4 || this.i == 5 || this.i == 7 || this.i == 10 || this.i == 11 || this.i == 12) { this.j = 1999; } int v2 = 8; int v3 = 6; int v4 = 2; if(this.j <= 1994 && (this.i == v4 || this.i == v3 || this.i == v2)) { this.i = 3; } if(this.j >= 1996 && (this.i == v4 || this.i == v3 || this.i == v2)) { this.i = 9; } if(this.j == 1995 && (this.h > this.i + v4 || this.i == this.h)) { this.i = v3; } this.g_year = this.j; this.f_month = this.i; this.e_day = this.h; } catch(Exception ) { this.n.setText(this.getString(2131427370)); } } private int e() { try { return this.d[(this.g_year - 1900) % 60]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int f() { try { return this.c[this.f_month - 1]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int g() { try { return this.b[this.e_day - 1]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int h() { int v0 = 2131165227; int v1 = 2131427370; try { String v0_1 = this.findViewById(v0).getText().toString(); v0_1 = v0_1.substring(8, v0_1.length()); int v3 = this.f_month; int v4 = 0; while(true) { if(v4 >= this.m.length) { break; } else if(v0_1.equals(this.m[v4])) { if(v3 == 2 && (v0_1.equals(this.m[6]))) { return 63; } this.k = this.a[v4]; v0 = 1; } else { ++v4; continue; } goto label_35; } v0 = 0; label_35: if(v0 == 0) { this.n.setText(this.getString(v1)); } return this.k; } catch(Exception ) { this.n.setText(this.getString(v1)); return 0; } } protected void onCreate(Bundle arg2) { super.onCreate(arg2); this.setContentView(2131296284); this.b(); this.n = this.findViewById(2131165242); this.findViewById(2131165273).setOnClickListener(new View$OnClickListener() { public void onClick(View arg3) { try { CrackMe.a(this.a); } catch(Exception ) { this.a.n.setText(this.a.getString(2131427370)); } } }); }} |
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | public class CrackMe extends AppCompatActivity { int[] a; int[] b; int[] c; int[] d; int e_day; int f_month; int g_year; int h; int i; int j; int k; String[] l; String[] m; TextView n; public CrackMe() { super(); this.a = new int[]{16, 6, 7, 10, 9, 16, 10, 8, 8, 9, 6, 6}; this.b = new int[]{5, 10, 8, 15, 16, 15, 8, 16, 8, 16, 9, 17, 8, 17, 10, 8, 9, 18, 5, 15, 10, 9, 8, 9, 15, 18, 7, 8, 16, 6}; this.c = new int[]{6, 7, 18, 9, 5, 16, 9, 15, 18, 8, 9, 5}; this.d = new int[]{7, 7, 9, 12, 8, 7, 13, 5, 14, 5, 9, 17, 5, 7, 12, 8, 8, 6, 19, 6, 8, 16, 10, 6, 12, 9, 6, 7, 12, 5, 9, 8, 7, 8, 15, 9, 16, 8, 8, 19, 12, 6, 8, 7, 5, 15, 6, 16, 15, 7, 9, 12, 10, 7, 15, 6, 5, 14, 14, 9}; this.l = new String[73]; this.m = new String[]{"23to01", "01to03", "03to05", "05to07", "07to09", "09to11", "11to13", "13to15", "15to17", "17to19", "19to21", "21to23"}; } private void a() { int v0 = 2131427370; try { this.c(); if(this.j != 0 && this.i != 0 && this.h != 0) { this.d(); this.a(this.e() + this.f() + this.g() + this.h()); return; } this.n.setText(this.getString(v0)); } catch(Exception ) { this.n.setText(this.getString(v0)); } } private void a(int arg8) { int v0 = 2131427370; int v1 = 34; if(arg8 <= v1) { if(arg8 < v1) { } else { try { this.n.setText(String.format("%s%s", this.getString(2131427369), this.l[arg8])); this.findViewById(2131165273).setEnabled(false); return; label_23: this.n.setText(this.getString(v0)); } catch(Exception ) { this.n.setText(this.getString(v0)); } return; } } goto label_23; } static void a(CrackMe arg0) { arg0.a(); } private void b() { int v0; for(v0 = 0; v0 <= 72; ++v0) { this.l[v0] = v0 != 34 ? this.getResources().getString(2131427374) : this.getResources().getString(2131427375); } } private void c() { int v0 = 2131165227; try { String v0_1 = this.findViewById(v0).getText().toString(); this.j = 0; this.i = 0; this.h = 0; int v3 = 4; String v2 = v0_1.length() > v3 ? v0_1.substring(0, v3) : v0_1; this.j = Integer.parseInt(v2); if(this.j > 0 && this.j < 189) { this.j = 0; } if(this.j <= 1983 || this.j >= 2007) { this.j = 0; } int v4 = 6; v2 = v0_1.length() > v4 ? v0_1.substring(v3, v4) : v0_1; this.i = Integer.parseInt(v2); if(this.i < 1 || this.i > 12) { this.i = 0; } int v5 = 8; if(v0_1.length() > v5) { v0_1 = v0_1.substring(v4, v5); } this.h = Integer.parseInt(v0_1); if(this.h >= 1 && this.h <= 31) { return; } this.h = 0; } catch(Exception ) { this.n.setText(this.getString(2131427370)); } } private void d() { try { if(this.j == 1989 || this.j == 2004) { this.h = 31; } if(this.i == 1 || this.i == 4 || this.i == 5 || this.i == 7 || this.i == 10 || this.i == 11 || this.i == 12) { this.j = 1999; } int v2 = 8; int v3 = 6; int v4 = 2; if(this.j <= 1994 && (this.i == v4 || this.i == v3 || this.i == v2)) { this.i = 3; } if(this.j >= 1996 && (this.i == v4 || this.i == v3 || this.i == v2)) { this.i = 9; } if(this.j == 1995 && (this.h > this.i + v4 || this.i == this.h)) { this.i = v3; } this.g_year = this.j; this.f_month = this.i; this.e_day = this.h; } catch(Exception ) { this.n.setText(this.getString(2131427370)); } } private int e() { try { return this.d[(this.g_year - 1900) % 60]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int f() { try { return this.c[this.f_month - 1]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int g() { try { return this.b[this.e_day - 1]; } catch(Exception ) { this.n.setText(this.getString(2131427370)); return 0; } } private int h() { int v0 = 2131165227; int v1 = 2131427370; try { String v0_1 = this.findViewById(v0).getText().toString(); v0_1 = v0_1.substring(8, v0_1.length()); int v3 = this.f_month; int v4 = 0; while(true) { if(v4 >= this.m.length) { break; } else if(v0_1.equals(this.m[v4])) { if(v3 == 2 && (v0_1.equals(this.m[6]))) { return 63; } this.k = this.a[v4]; v0 = 1; } else { ++v4; continue; } goto label_35; } v0 = 0; label_35: if(v0 == 0) { this.n.setText(this.getString(v1)); } return this.k; } catch(Exception ) { this.n.setText(this.getString(v1)); return 0; } } protected void onCreate(Bundle arg2) { super.onCreate(arg2); this.setContentView(2131296284); this.b(); this.n = this.findViewById(2131165242); this.findViewById(2131165273).setOnClickListener(new View$OnClickListener() { public void onClick(View arg3) { try { CrackMe.a(this.a); } catch(Exception ) { this.a.n.setText(this.a.getString(2131427370)); } } }); }} |
c函数检测判断前四位的年份是否在1984-2007之间，月份是否是01-12 日期是否在01-31 之间
d函数根据输入的年月日生成新的年月日
e函数根据新的年获取一个数 this.d[(this.g_year - 1900) % 60];
f函数返回月份对应的值
g函数返回日期对应的值
h函数判断月份 后8位之后的字符串，返回一个值
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