Re
1、fastjs
提取字节码
/* File generated automatically by the QuickJS compiler. */#include "quickjs-libc.h"const uint32_t qjsc_hello_size = 2269;const uint8_t qjsc_hello[2269] = {0x02, 0x3A, 0x10, 0x6C, 0x6F, 0x6E, 0x67, 0x32, 0x73, 0x74, 0x72, 0x10, 0x73, 0x74, 0x72, 0x32,0x6C, 0x6F, 0x6E, 0x67, 0x10, 0x73, 0x64, 0x66, 0x73, 0x66, 0x73, 0x64, 0x66, 0x0E, 0x73, 0x74,0x72, 0x32, 0x48, 0x65, 0x78, 0x0E, 0x68, 0x65, 0x78, 0x32, 0x73, 0x74, 0x72, 0x0C, 0x78, 0x78,0x78, 0x66, 0x73, 0x73, 0x08, 0x6D, 0x61, 0x69, 0x6E, 0x08, 0x61, 0x72, 0x67, 0x73, 0x82, 0x01,0x41, 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, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F,0x3D, 0x0E, 0x5F, 0x6B, 0x65, 0x79, 0x53, 0x74, 0x72, 0x0A, 0x64, 0x66, 0x73, 0x66, 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0xC1, 0xC3,0x07, 0xB5, 0xC3, 0x08, 0xD1, 0x42, 0xF9, 0x00, 0x00, 0x00, 0xC2, 0x08, 0x91, 0xC3, 0x08, 0x24,0x01, 0x00, 0xCA, 0xD1, 0x42, 0xF9, 0x00, 0x00, 0x00, 0xC2, 0x08, 0x91, 0xC3, 0x08, 0x24, 0x01,0x00, 0xCB, 0xD1, 0x42, 0xF9, 0x00, 0x00, 0x00, 0xC2, 0x08, 0x91, 0xC3, 0x08, 0x24, 0x01, 0x00,0xCC, 0xC6, 0xB7, 0xA1, 0xC3, 0x04, 0xC6, 0xB8, 0xAD, 0xB9, 0xA0, 0xC7, 0xB9, 0xA1, 0xAF, 0xC3,0x05, 0xC7, 0xBD, 0x0F, 0xAD, 0xB7, 0xA0, 0xC8, 0xBB, 0xA1, 0xAF, 0xC3, 0x06, 0xC8, 0xBD, 0x3F,0xAD, 0xC3, 0x07, 0x38, 0x11, 0x01, 0x00, 0x00, 0xC7, 0xEF, 0xEA, 0x09, 0xBD, 0x40, 0xC4, 0x07,0xC3, 0x06, 0xEC, 0x0E, 0x38, 0x11, 0x01, 0x00, 0x00, 0xC8, 0xEF, 0xEA, 0x05, 0xBD, 0x40, 0xC3,0x07, 0xC5, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 0x42, 0x12, 0x01, 0x00,0x00, 0xC2, 0x04, 0x24, 0x01, 0x00, 0x9D, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00,0x00, 0x42, 0x12, 0x01, 0x00, 0x00, 0xC2, 0x05, 0x24, 0x01, 0x00, 0x9D, 0x38, 0xE6, 0x00, 0x00,0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 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0x00, 0x42,0xEB, 0x00, 0x00, 0x00, 0xC5, 0x24, 0x01, 0x00, 0xCA, 0x04, 0x17, 0x01, 0x00, 0x00, 0x11, 0x39,0x18, 0x01, 0x00, 0x00, 0x0E, 0x38, 0xE3, 0x00, 0x00, 0x00, 0xC6, 0x38, 0x18, 0x01, 0x00, 0x00,0xF0, 0xCF, 0xE9, 0xBD, 0x70, 0xAA, 0xEA, 0x0D, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0xEE, 0x00,0x00, 0x00, 0xEF, 0x29, 0x04, 0x19, 0x01, 0x00, 0x00, 0xCC, 0xC7, 0xC8, 0xA9, 0xEA, 0x0E, 0x38,0x15, 0x01, 0x00, 0x00, 0x04, 0x1A, 0x01, 0x00, 0x00, 0xEF, 0x0E, 0x29, 0x38, 0x15, 0x01, 0x00,0x00, 0x04, 0xEE, 0x00, 0x00, 0x00, 0xEF, 0x29, 0xDE, 0x03, 0x76, 0x11, 0x03, 0x21, 0x3B, 0x08,0x54, 0x17, 0x4F, 0x3F, 0x40, 0x26, 0x3B, 0x09, 0x21, 0x1D, 0x3F, 0x09, 0x3C};static JSContext *JS_NewCustomContext(JSRuntime *rt){JSContext *ctx = JS_NewContextRaw(rt);if (!ctx)return NULL;JS_AddIntrinsicBaseObjects(ctx);return ctx;}int main(int argc, char **argv){JSRuntime *rt;JSContext *ctx;rt = JS_NewRuntime();js_std_set_worker_new_context_func(JS_NewCustomContext);js_std_init_handlers(rt);ctx = JS_NewCustomContext(rt);js_std_add_helpers(ctx, argc, argv);js_std_eval_binary(ctx, qjsc_hello, qjsc_hello_size, 0);js_std_loop(ctx);JS_FreeContext(ctx);JS_FreeRuntime(rt);return 0;}
编译dump出bytecode
0000: 02 3a 58 atom indexes {1"long2str"1"str2long"1"sdfsfsdf"1"str2Hex"1"hex2str"1"xxxfss"1"main"1"args"1"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="1"_keyStr"1"dfsfs"1"scriptArgs"1"shift"1"error"1"./test_encode.js"1"v"1"w"1"vl"1"sl"1"i"1"fromCharCode"1"substring"1"s"1"len"1"charCodeAt"1"str"1"key"1"k"1"n"1"z"1"y"1"delta"1"mx"1"e"1"q"1"sum"1"p"1"floor"1"output"1"chr1"1"parseInt"1"substr"1"chr2"1"chr3"1"enc1"1"enc2"1"enc3"1"enc4"1"isNaN"1"charAt"1"dfsfdsfsd"1"fwderf"1"print"1"your input: "1"no_thing_is_true"1"dfdfwf3"1"05aed0ce441f80b5bc36af4c698509fc6cc3c97146353de5a95c6abea07fd4a7070932d86ac32d628672a59123e5972331db5dffe7057362"1"yes"0002: 10 6c 6f 6e 67 32 73 7472 10 73 74 72 32 6c 6f6e 67 10 73 64 66 73 6673 64 66 0e 73 74 72 3248 65 78 0e 68 65 78 3273 74 72 0c 78 78 78 6673 73 08 6d 61 69 6e 0861 72 67 73 82 01 41 4243 44 45 46 47 48 49 4a4b 4c 4d 4e 4f 50 51 5253 54 55 56 57 58 59 5a61 62 63 64 65 66 67 6869 6a 6b 6c 6d 6e 6f 7071 72 73 74 75 76 77 7879 7a 30 31 32 33 34 3536 37 38 39 2b 2f 3d 0e5f 6b 65 79 53 74 72 0a64 66 73 66 73 14 73 6372 69 70 74 41 72 67 730a 73 68 69 66 74 0a 6572 72 6f 72 20 2e 2f 7465 73 74 5f 65 6e 63 6f64 65 2e 6a 73 02 76 0277 04 76 6c 04 73 6c 0269 18 66 72 6f 6d 43 6861 72 43 6f 64 65 12 7375 62 73 74 72 69 6e 6702 73 06 6c 65 6e 14 6368 61 72 43 6f 64 65 4174 06 73 74 72 06 6b 6579 02 6b 02 6e 02 7a 0279 0a 64 65 6c 74 61 046d 78 02 65 02 71 06 7375 6d 02 70 0a 66 6c 6f6f 72 0c 6f 75 74 70 7574 08 63 68 72 31 10 7061 72 73 65 49 6e 74 0c73 75 62 73 74 72 08 6368 72 32 08 63 68 72 3308 65 6e 63 31 08 65 6e63 32 08 65 6e 63 33 0865 6e 63 34 0a 69 73 4e61 4e 0c 63 68 61 72 4174 12 64 66 73 66 64 7366 73 64 0c 66 77 64 6572 66 0a 70 72 69 6e 7418 79 6f 75 72 20 69 6e70 75 74 3a 20 20 6e 6f5f 74 68 69 6e 67 5f 6973 5f 74 72 75 65 0e 6466 64 66 77 66 33 e0 0130 35 61 65 64 30 63 6534 34 31 66 38 30 62 3562 63 33 36 61 66 34 6336 39 38 35 30 39 66 6336 63 63 33 63 39 37 3134 36 33 35 33 64 65 3561 39 35 63 36 61 62 6561 30 37 66 64 34 61 3730 37 30 39 33 32 64 3836 61 63 33 32 64 36 3238 36 37 32 61 35 39 3132 33 65 35 39 37 32 3333 31 64 62 35 64 66 6665 37 30 35 37 33 36 3206 79 65 73 }020e: 0e function {020f: 00 06 00 a0 01 00 01 0003 00 08 e4 01 01 name: "<eval>"args=0 vars=1 defargs=0 closures=0 cpool=8stack=3 bclen=228 locals=1vars {021d: a2 01 00 00 00 name: "<ret>"}bytecode {0222: 3f e1 00 00 00 40 3f e200 00 00 40 3f e3 00 0000 40 3f e4 00 00 00 403f e5 00 00 00 40 3f e600 00 00 40 3f e7 00 0000 40 3f e8 00 00 00 00c0 00 40 e1 00 00 00 00c0 01 40 e2 00 00 00 00c0 02 40 e3 00 00 00 00c0 03 40 e4 00 00 00 00c0 04 40 e5 00 00 00 00c0 05 40 e6 00 00 00 00c0 07 40 e7 00 00 00 003e e8 00 00 00 00 38 e600 00 00 04 e9 00 00 0015 43 ea 00 00 00 c9 38e6 00 00 00 c0 06 15 43eb 00 00 00 c9 06 c9 37ec 00 00 00 f4 eb 1d 38ec 00 00 00 11 39 e8 0000 00 c9 38 e8 00 00 0042 ed 00 00 00 24 00 00c9 ec 25 06 c9 37 4d 0000 00 f4 eb 0f 38 4d 0000 00 11 39 e8 00 00 00c9 ec 0d 04 ee 00 00 0011 39 e8 00 00 00 c9 38e7 00 00 00 38 e8 00 0000 ef cd 28 at 1, fixup atom: long2strat 7, fixup atom: str2longat 13, fixup atom: sdfsfsdfat 19, fixup atom: str2Hexat 25, fixup atom: hex2strat 31, fixup atom: xxxfssat 37, fixup atom: mainat 43, fixup atom: argsat 51, fixup atom: long2strat 59, fixup atom: str2longat 67, fixup atom: sdfsfsdfat 75, fixup atom: str2Hexat 83, fixup atom: hex2strat 91, fixup atom: xxxfssat 99, fixup atom: mainat 105, fixup atom: argsat 111, fixup atom: xxxfssat 116, fixup atom: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="at 122, fixup atom: _keyStrat 128, fixup atom: xxxfssat 136, fixup atom: dfsfsat 144, fixup atom: scriptArgsat 152, fixup atom: scriptArgsat 158, fixup atom: argsat 164, fixup atom: argsat 169, fixup atom: shiftat 182, fixup atom: argumentsat 190, fixup atom: argumentsat 196, fixup atom: argsat 204, fixup atom: errorat 210, fixup atom: argsat 216, fixup atom: mainat 221, fixup atom: args}debug {0306: de 03 01 13 f1 00 3e b001 58 00 05 36 00 09 4035 3f 49 3f 3f 0d 41 filename: "./test_encode.js"}cpool {031d: 0e function {031e: 43 06 00 c2 03 02 03 0209 00 01 6e 05 name: long2strargs=2 vars=3 defargs=2 closures=0 cpool=1stack=9 bclen=110 locals=5vars {032b: e0 03 00 01 00 name: v0330: e2 03 00 01 00 name: w0335: e4 03 00 00 00 name: vl033a: e6 03 00 01 00 name: sl033f: e8 03 00 02 00 name: i}bytecode {0344: d1 e9 c9 d1 c5 b6 9e 47bf 00 ad ca b5 cb c7 c5a3 ea 3b d1 c7 71 38 9900 00 00 42 f5 00 00 00d1 c7 47 be ff 00 ad d1c7 47 bd 08 a2 be ff 00ad d1 c7 47 bd 10 a2 beff 00 ad d1 c7 47 bd 18a2 be ff 00 ad 24 04 0049 93 02 ec c2 d2 ea 15d1 42 5b 00 00 00 c1 2401 00 42 f6 00 00 00 b5c6 25 02 00 d1 42 5b 0000 00 c1 25 01 00 at 23, fixup atom: Stringat 28, fixup atom: fromCharCodeat 82, fixup atom: joinat 91, fixup atom: substringat 102, fixup atom: join}debug {03b2: de 03 01 0b 03 12 30 2767 35 35 49 17 12 69 filename: "./test_encode.js"}cpool {03c1: 06 float64 {03c2: 00 00 e0 ff ff ff ef 41 4.29497e+09}}./test_encode.js:1: function: long2strargs: v wlocals:0: var vl1: var sl2: var istack_size: 9opcodes:get_arg0 0: vget_lengthput_loc0 0: vlget_arg0 0: vget_loc0 0: vlpush_1 1subget_array_elpush_const8 0: 4294967295andput_loc1 1: slpush_0 0put_loc2 2: i14: get_loc2 2: iget_loc0 0: vlltif_false8 77get_arg0 0: vget_loc2 2: ito_propkey2get_var Stringget_field2 fromCharCodeget_arg0 0: vget_loc2 2: iget_array_elpush_i16 255andget_arg0 0: vget_loc2 2: iget_array_elpush_i8 8shrpush_i16 255andget_arg0 0: vget_loc2 2: iget_array_elpush_i8 16shrpush_i16 255andget_arg0 0: vget_loc2 2: iget_array_elpush_i8 24shrpush_i16 255andcall_method 4put_array_elinc_loc 2: igoto8 1477: get_arg1 1: wif_false8 100get_arg0 0: vget_field2 joinpush_empty_stringcall_method 1get_field2 substringpush_0 0get_loc1 1: sltail_call_method 2100: get_arg0 0: vget_field2 joinpush_empty_stringtail_call_method 1}03ca: 0e function {03cb: 43 06 00 c4 03 02 03 0207 00 00 5d 05 name: str2longargs=2 vars=3 defargs=2 closures=0 cpool=0stack=7 bclen=93 locals=5vars {03d8: ee 03 00 01 00 name: s03dd: e2 03 00 01 00 name: w03e2: f0 03 00 00 00 name: len03e7: e0 03 00 01 00 name: v03ec: e8 03 00 02 00 name: i}bytecode {03f1: d1 e9 c9 26 00 00 ca b5cb c7 c5 a3 ea 46 c6 c7b7 a1 71 d1 42 f9 00 0000 c7 24 01 00 d1 42 f900 00 00 c7 b6 9d 24 0100 bd 08 a0 af d1 42 f900 00 00 c7 b7 9d 24 0100 bd 10 a0 af d1 42 f900 00 00 c7 b8 9d 24 0100 bd 18 a0 af 49 b9 9402 ec b7 d2 ea 06 c6 c6e9 c5 49 c6 28 at 21, fixup atom: charCodeAtat 31, fixup atom: charCodeAtat 47, fixup atom: charCodeAtat 63, fixup atom: charCodeAt}debug {044e: de 03 13 0b 03 12 17 274e 53 53 58 1c 12 1d filename: "./test_encode.js"}./test_encode.js:19: function: str2longargs: s wlocals:0: var len1: var v2: var istack_size: 7opcodes:get_arg0 0: sget_lengthput_loc0 0: lenarray_from 0put_loc1 1: vpush_0 0put_loc2 2: i9: get_loc2 2: iget_loc0 0: lenltif_false8 83get_loc1 1: vget_loc2 2: ipush_2 2sarto_propkey2get_arg0 0: sget_field2 charCodeAtget_loc2 2: icall_method 1get_arg0 0: sget_field2 charCodeAtget_loc2 2: ipush_1 1addcall_method 1push_i8 8shlorget_arg0 0: sget_field2 charCodeAtget_loc2 2: ipush_2 2addcall_method 1push_i8 16shlorget_arg0 0: sget_field2 charCodeAtget_loc2 2: ipush_3 3addcall_method 1push_i8 24shlorput_array_elpush_4 4add_loc 2: igoto8 983: get_arg1 1: wif_false8 91get_loc1 1: vget_loc1 1: vget_lengthget_loc0 0: lenput_array_el91: get_loc1 1: vreturn}045d: 0e function {045e: 43 06 00 c6 03 02 0b 0206 00 04 f8 01 0d name: sdfsfsdfargs=2 vars=11 defargs=2 closures=0 cpool=4stack=6 bclen=248 locals=13vars {046c: f4 03 00 01 00 name: str0471: f6 03 00 01 00 name: key0476: e0 03 00 00 00 name: v047b: f8 03 00 01 00 name: k0480: fa 03 00 02 00 name: n0485: fc 03 00 03 00 name: z048a: fe 03 00 04 00 name: y048f: 80 04 00 05 00 name: delta0494: 82 04 00 06 00 name: mx0499: 84 04 00 07 00 name: e049e: 86 04 00 08 00 name: q04a3: 88 04 00 09 00 name: sum04a8: 8a 04 00 0a 00 name: p}bytecode {04ad: d1 c1 a9 ea 03 c1 28 38e2 00 00 00 d1 0a f0 c938 e2 00 00 00 d2 09 f0ca c5 e9 b6 9e cb c5 c747 cc c5 b5 47 c3 04 bf00 c3 05 38 9d 00 00 0042 06 01 00 00 bb bd 34c7 b6 9d 9b 9d 24 01 00c3 08 b5 c3 09 c2 08 90c3 08 b5 a5 69 9b 00 0000 c2 09 c2 05 9d bf 01ad c4 09 b7 a2 b8 ad c307 b5 c3 0a c2 0a c7 a3ea 43 c5 c2 0a b6 9d 47c3 04 c8 ba a2 c2 04 b7a0 ae c2 04 b8 a2 c8 b9a0 ae 9d c2 09 c2 04 aec6 c2 0a b8 ad c2 07 ae47 c8 ae 9d ae c3 06 c5c2 0a 71 c5 c2 0a 47 c206 9d bf 02 ad 16 49 cc93 0a ec b9 c5 b5 47 c304 c8 ba a2 c2 04 b7 a0ae c2 04 b8 a2 c8 b9 a0ae 9d c2 09 c2 04 ae c6c2 0a b8 ad c2 07 ae 47c8 ae 9d ae c3 06 c5 c771 c5 c7 47 c2 06 9d bf03 ad 16 49 cc ed 5f ff38 e4 00 00 00 38 e1 0000 00 c5 09 f0 23 01 00 at 8, fixup atom: str2longat 17, fixup atom: str2longat 44, fixup atom: Mathat 49, fixup atom: floorat 233, fixup atom: str2Hexat 238, fixup atom: long2str}debug {05a5: de 03 23 15 03 1c 08 0830 30 1d 44 85 3f 35 2130 2b bc 58 17 1c bc 4e13 filename: "./test_encode.js"}cpool {05be: 06 float64 {05bf: 00 00 20 37 ef c6 e3 41 2.65444e+09}05c7: 06 float64 {05c8: 00 00 e0 ff ff ff ef 41 4.29497e+09}05d0: 06 float64 {05d1: 00 00 e0 ff ff ff ef 41 4.29497e+09}05d9: 06 float64 {05da: 00 00 e0 ff ff ff ef 41 4.29497e+09}}./test_encode.js:35: function: sdfsfsdfargs: str keylocals:0: var v1: var k2: var n3: var z4: var y5: var delta6: var mx7: var e8: var q9: var sum10: var pstack_size: 6opcodes:get_arg0 0: strpush_empty_stringeqif_false8 7push_empty_stringreturn7: get_var str2longget_arg0 0: strpush_truecall2 2put_loc0 0: vget_var str2longget_arg1 1: keypush_falsecall2 2put_loc1 1: kget_loc0 0: vget_lengthpush_1 1subput_loc2 2: nget_loc0 0: vget_loc2 2: nget_array_elput_loc3 3: zget_loc0 0: vpush_0 0get_array_elput_loc8 4: ypush_const8 0: 2654435769put_loc8 5: deltaget_var Mathget_field2 floorpush_6 6push_i8 52get_loc2 2: npush_1 1adddivaddcall_method 1put_loc8 8: qpush_0 0put_loc8 9: sum69: get_loc8 8: qpost_decput_loc8 8: qpush_0 0gtif_false 232get_loc8 9: sumget_loc8 5: deltaaddpush_const8 1: 4294967295andset_loc8 9: sumpush_2 2shrpush_3 3andput_loc8 7: epush_0 0put_loc8 10: p100: get_loc8 10: pget_loc2 2: nltif_false8 172get_loc0 0: vget_loc8 10: ppush_1 1addget_array_elput_loc8 4: yget_loc3 3: zpush_5 5shrget_loc8 4: ypush_2 2shlxorget_loc8 4: ypush_3 3shrget_loc3 3: zpush_4 4shlxoraddget_loc8 9: sumget_loc8 4: yxorget_loc1 1: kget_loc8 10: ppush_3 3andget_loc8 7: exorget_array_elget_loc3 3: zxoraddxorput_loc8 6: mxget_loc0 0: vget_loc8 10: pto_propkey2get_loc0 0: vget_loc8 10: pget_array_elget_loc8 6: mxaddpush_const8 2: 4294967295andinsert3put_array_elput_loc3 3: zinc_loc 10: pgoto8 100172: get_loc0 0: vpush_0 0get_array_elput_loc8 4: yget_loc3 3: zpush_5 5shrget_loc8 4: ypush_2 2shlxorget_loc8 4: ypush_3 3shrget_loc3 3: zpush_4 4shlxoraddget_loc8 9: sumget_loc8 4: yxorget_loc1 1: kget_loc8 10: ppush_3 3andget_loc8 7: exorget_array_elget_loc3 3: zxoraddxorput_loc8 6: mxget_loc0 0: vget_loc2 2: nto_propkey2get_loc0 0: vget_loc2 2: nget_array_elget_loc8 6: mxaddpush_const8 3: 4294967295andinsert3put_array_elput_loc3 3: zgoto16 69232: get_var str2Hexget_var long2strget_loc0 0: vpush_falsecall2 2tail_call 1}05e2: 0e function {05e3: 43 06 00 c8 03 01 03 0104 00 01 32 04 name: str2Hexargs=1 vars=3 defargs=1 closures=0 cpool=1stack=4 bclen=50 locals=4vars {05f0: b0 01 00 01 00 name: input05f5: 8e 04 00 00 00 name: output05fa: 90 04 00 01 00 name: chr105ff: e8 03 00 02 00 name: i}bytecode {0604: c1 c9 c1 ca b5 cb d1 42f9 00 00 00 c7 91 cb 2401 00 42 37 00 00 00 bd10 24 01 00 ce e9 b6 a9ea 06 bf 00 c6 9d ca c694 00 c7 d1 e9 a3 eb d7c5 28 at 8, fixup atom: charCodeAtat 19, fixup atom: toString}debug {0636: de 03 3e 08 03 0d 0d 0e76 35 12 21 filename: "./test_encode.js"}cpool {0642: 07 string {1"0"0643: 02 30 }}./test_encode.js:62: function: str2Hexargs: inputlocals:0: var output1: var chr12: var istack_size: 4opcodes:push_empty_stringput_loc0 0: outputpush_empty_stringput_loc1 1: chr1push_0 0put_loc2 2: i6: get_arg0 0: inputget_field2 charCodeAtget_loc2 2: ipost_incput_loc2 2: icall_method 1get_field2 toStringpush_i8 16call_method 1set_loc1 1: chr1get_lengthpush_1 1eqif_false8 39push_const8 0: 1"0"get_loc1 1: chr1addput_loc1 1: chr139: get_loc1 1: chr1add_loc 0: outputget_loc2 2: iget_arg0 0: inputget_lengthltif_true8 6get_loc0 0: outputreturn}0645: 0e function {0646: 43 06 00 ca 03 01 03 0106 00 00 52 04 name: hex2strargs=1 vars=3 defargs=1 closures=0 cpool=0stack=6 bclen=82 locals=4vars {0653: b0 01 00 01 00 name: input0658: 8e 04 00 00 00 name: output065d: e8 03 00 01 00 name: i0662: f8 03 00 02 00 name: k}bytecode {0667: c1 c9 b5 ca c6 d1 e9 a3ea 47 38 09 01 00 00 d142 0a 01 00 00 c6 b6 2402 00 bd 10 f0 b9 a0 3809 01 00 00 d1 42 0a 0100 00 c6 8f ce b6 24 0200 bd 10 f0 af cf be ff00 ad cb c5 38 99 00 0000 42 f5 00 00 00 c7 2401 00 9d c9 93 01 ec b5c5 28 at 11, fixup atom: parseIntat 17, fixup atom: substrat 32, fixup atom: parseIntat 38, fixup atom: substrat 61, fixup atom: Stringat 66, fixup atom: fromCharCode}debug {06b9: de 03 4a 09 03 0d 0d 21da 21 58 0d 0d filename: "./test_encode.js"}./test_encode.js:74: function: hex2strargs: inputlocals:0: var output1: var i2: var kstack_size: 6opcodes:push_empty_stringput_loc0 0: outputpush_0 0put_loc1 1: i4: get_loc1 1: iget_arg0 0: inputget_lengthltif_false8 80get_var parseIntget_arg0 0: inputget_field2 substrget_loc1 1: ipush_1 1call_method 2push_i8 16call2 2push_4 4shlget_var parseIntget_arg0 0: inputget_field2 substrget_loc1 1: iincset_loc1 1: ipush_1 1call_method 2push_i8 16call2 2orset_loc2 2: kpush_i16 255andput_loc2 2: kget_loc0 0: outputget_var Stringget_field2 fromCharCodeget_loc2 2: kcall_method 1addput_loc0 0: outputinc_loc 1: igoto8 480: get_loc0 0: outputreturn}06c6: 0e function {06c7: 43 06 00 cc 03 00 00 0000 00 00 01 00 name: xxxfssargs=0 vars=0 defargs=0 closures=0 cpool=0stack=0 bclen=1 locals=0bytecode {06d4: 29 }debug {06d5: de 03 56 01 03 filename: "./test_encode.js"}./test_encode.js:86: function: xxxfssstack_size: 0opcodes:return_undef}06da: 0e function {06db: 43 06 00 00 01 09 01 0400 00 e6 01 0a name: "<null>"args=1 vars=9 defargs=1 closures=0 cpool=0stack=4 bclen=230 locals=10vars {06e8: b0 01 00 01 00 name: input06ed: 8e 04 00 00 00 name: output06f2: 90 04 00 01 00 name: chr106f7: 96 04 00 02 00 name: chr206fc: 98 04 00 03 00 name: chr30701: 9a 04 00 04 00 name: enc10706: 9c 04 00 05 00 name: enc2070b: 9e 04 00 06 00 name: enc30710: a0 04 00 07 00 name: enc40715: e8 03 00 08 00 name: i}bytecode {071a: c1 c9 c1 cc c1 c3 07 b5c3 08 d1 42 f9 00 00 00c2 08 91 c3 08 24 01 00ca d1 42 f9 00 00 00 c208 91 c3 08 24 01 00 cbd1 42 f9 00 00 00 c2 0891 c3 08 24 01 00 cc c6b7 a1 c3 04 c6 b8 ad b9a0 c7 b9 a1 af c3 05 c7bd 0f ad b7 a0 c8 bb a1af c3 06 c8 bd 3f ad c307 38 11 01 00 00 c7 efea 09 bd 40 c4 07 c3 06ec 0e 38 11 01 00 00 c8ef ea 05 bd 40 c3 07 c538 e6 00 00 00 41 ea 0000 00 42 12 01 00 00 c204 24 01 00 9d 38 e6 0000 00 41 ea 00 00 00 4212 01 00 00 c2 05 24 0100 9d 38 e6 00 00 00 41ea 00 00 00 42 12 01 0000 c2 06 24 01 00 9d 38e6 00 00 00 41 ea 00 0000 42 12 01 00 00 c2 0724 01 00 9d c9 c1 d0 cfca c1 c4 07 c4 06 c4 05c3 04 c2 08 d1 e9 a3 6a2a ff ff ff c5 28 at 12, fixup atom: charCodeAtat 27, fixup atom: charCodeAtat 42, fixup atom: charCodeAtat 90, fixup atom: isNaNat 107, fixup atom: isNaNat 121, fixup atom: xxxfssat 126, fixup atom: _keyStrat 131, fixup atom: charAtat 142, fixup atom: xxxfssat 147, fixup atom: _keyStrat 152, fixup atom: charAtat 163, fixup atom: xxxfssat 168, fixup atom: _keyStrat 173, fixup atom: charAtat 184, fixup atom: xxxfssat 189, fixup atom: _keyStrat 194, fixup atom: charAt}debug {0800: de 03 59 18 03 0d 0d 1213 4e 4e 4e 1c 3a 3f 2130 21 3a 18 08 6c 6c 6c71 17 30 35 filename: "./test_encode.js"}./test_encode.js:89: function: <null>args: inputlocals:0: var output1: var chr12: var chr23: var chr34: var enc15: var enc26: var enc37: var enc48: var istack_size: 4opcodes:push_empty_stringput_loc0 0: outputpush_empty_stringput_loc3 3: chr3push_empty_stringput_loc8 7: enc4push_0 0put_loc8 8: i10: get_arg0 0: inputget_field2 charCodeAtget_loc8 8: ipost_incput_loc8 8: icall_method 1put_loc1 1: chr1get_arg0 0: inputget_field2 charCodeAtget_loc8 8: ipost_incput_loc8 8: icall_method 1put_loc2 2: chr2get_arg0 0: inputget_field2 charCodeAtget_loc8 8: ipost_incput_loc8 8: icall_method 1put_loc3 3: chr3get_loc1 1: chr1push_2 2sarput_loc8 4: enc1get_loc1 1: chr1push_3 3andpush_4 4shlget_loc2 2: chr2push_4 4sarorput_loc8 5: enc2get_loc2 2: chr2push_i8 15andpush_2 2shlget_loc3 3: chr3push_6 6sarorput_loc8 6: enc3get_loc3 3: chr3push_i8 63andput_loc8 7: enc4get_var isNaNget_loc2 2: chr2call1 1if_false8 106push_i8 64set_loc8 7: enc4put_loc8 6: enc3goto8 119106: get_var isNaNget_loc3 3: chr3call1 1if_false8 119push_i8 64put_loc8 7: enc4119: get_loc0 0: outputget_var xxxfssget_field _keyStrget_field2 charAtget_loc8 4: enc1call_method 1addget_var xxxfssget_field _keyStrget_field2 charAtget_loc8 5: enc2call_method 1addget_var xxxfssget_field _keyStrget_field2 charAtget_loc8 6: enc3call_method 1addget_var xxxfssget_field _keyStrget_field2 charAtget_loc8 7: enc4call_method 1addput_loc0 0: outputpush_empty_stringset_loc3 3: chr3set_loc2 2: chr2put_loc1 1: chr1push_empty_stringset_loc8 7: enc4set_loc8 6: enc3set_loc8 5: enc2put_loc8 4: enc1get_loc8 8: iget_arg0 0: inputget_lengthltif_true 10get_loc0 0: outputreturn}081c: 0e function {081d: 43 06 00 ce 03 01 04 0104 00 00 84 01 05 name: mainargs=1 vars=4 defargs=1 closures=0 cpool=0stack=4 bclen=132 locals=5vars {082b: d0 03 00 01 00 name: args0830: b0 01 00 00 00 name: input0835: a6 04 00 01 00 name: dfsfdsfsd083a: a8 04 00 02 00 name: fwderf083f: ac 01 00 03 00 name: target}bytecode {0844: d1 e9 b6 a3 ea 0d 38 1501 00 00 04 ee 00 00 00ef 29 38 15 01 00 00 0416 01 00 00 d1 b5 47 9def 0e d1 b5 47 c9 38 e600 00 00 42 eb 00 00 00c5 24 01 00 ca 04 17 0100 00 11 39 18 01 00 000e 38 e3 00 00 00 c6 3818 01 00 00 f0 cf e9 bd70 aa ea 0d 38 15 01 0000 04 ee 00 00 00 ef 2904 19 01 00 00 cc c7 c8a9 ea 0e 38 15 01 00 0004 1a 01 00 00 ef 0e 2938 15 01 00 00 04 ee 0000 00 ef 29 at 7, fixup atom: printat 12, fixup atom: errorat 19, fixup atom: printat 24, fixup atom: "your input: "at 39, fixup atom: xxxfssat 44, fixup atom: dfsfsat 54, fixup atom: no_thing_is_trueat 60, fixup atom: dfdfwf3at 66, fixup atom: sdfsfsdfat 72, fixup atom: dfdfwf3at 85, fixup atom: printat 90, fixup atom: errorat 97, fixup atom: "05aed0ce441f80b5bc36af4c698509fc6cc3c97146353de5a95c6abea07fd4a7070932d86ac32d628672a59123e5972331db5dffe7057362"at 108, fixup atom: printat 113, fixup atom: yesat 121, fixup atom: printat 126, fixup atom: error}debug {08c8: de 03 76 11 03 21 3b 0854 17 4f 3f 40 26 3b 0921 1d 3f 09 3c filename: "./test_encode.js"}./test_encode.js:118: function: mainargs: argslocals:0: var input1: var dfsfdsfsd2: var fwderf3: var targetstack_size: 4opcodes:get_arg0 0: argsget_lengthpush_1 1ltif_false8 18get_var printpush_atom_value errorcall1 1return_undef18: get_var printpush_atom_value "your input: "get_arg0 0: argspush_0 0get_array_eladdcall1 1dropget_arg0 0: argspush_0 0get_array_elput_loc0 0: inputget_var xxxfssget_field2 dfsfsget_loc0 0: inputcall_method 1put_loc1 1: dfsfdsfsdpush_atom_value no_thing_is_truedupput_var dfdfwf3dropget_var sdfsfsdfget_loc1 1: dfsfdsfsdget_var dfdfwf3call2 2set_loc2 2: fwderfget_lengthpush_i8 112neqif_false8 96get_var printpush_atom_value errorcall1 1return_undef96: push_atom_value "05aed0ce441f80b5bc36af4c698509fc6cc3c97146353de5a95c6abea07fd4a7070932d86ac32d628672a59123e5972331db5dffe7057362"put_loc3 3: targetget_loc2 2: fwderfget_loc3 3: targeteqif_false8 120get_var printpush_atom_value yescall1 1dropreturn_undef120: get_var printpush_atom_value errorcall1 1return_undef}}./test_encode.js:1: function: <eval>locals:0: var <ret>stack_size: 3opcodes:check_define_var long2str,64check_define_var str2long,64check_define_var sdfsfsdf,64check_define_var str2Hex,64check_define_var hex2str,64check_define_var xxxfss,64check_define_var main,64check_define_var args,0fclosure8 0: [bytecode long2str]define_func long2str,0fclosure8 1: [bytecode str2long]define_func str2long,0fclosure8 2: [bytecode sdfsfsdf]define_func sdfsfsdf,0fclosure8 3: [bytecode str2Hex]define_func str2Hex,0fclosure8 4: [bytecode hex2str]define_func hex2str,0fclosure8 5: [bytecode xxxfss]define_func xxxfss,0fclosure8 7: [bytecode main]define_func main,0define_var args,0get_var xxxfsspush_atom_value "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="insert2put_field _keyStrput_loc0 0: "<ret>"get_var xxxfssfclosure8 6: [bytecode <null>]insert2put_field dfsfsput_loc0 0: "<ret>"undefinedput_loc0 0: "<ret>"get_var_undef scriptArgstypeof_is_undefinedif_true8 179get_var scriptArgsdupput_var argsput_loc0 0: "<ret>"get_var argsget_field2 shiftcall_method 0put_loc0 0: "<ret>"goto8 215179: undefinedput_loc0 0: "<ret>"get_var_undef argumentstypeof_is_undefinedif_true8 203get_var argumentsdupput_var argsput_loc0 0: "<ret>"goto8 215203: push_atom_value errordupput_var argsput_loc0 0: "<ret>"215: get_var mainget_var argscall1 1set_loc0 0: "<ret>"return}error
一共有这些函数
eval、long2str、str2long、sdfsfsdf、str2Hex、hex2str、xxxfss、<null>、main
接下来分析各个函数的功能
sdfsfsdf:
应该为tea系列
然后key为 no_thing_is_true
直接上脚本
#include <stdio.h>#include <stdlib.h>#define DELTA 0x9e3779b9//0x61C88647int main(){char v1[] ={0x05,0xae,0xd0,0xce,0x44,0x1f,0x80,0xb5,0xbc,0x36,0xaf,0x4c,0x69,0x85,0x09,0xfc,0x6c,0xc3,0xc9,0x71,0x46,0x35,0x3d,0xe5,0xa9,0x5c,0x6a,0xbe,0xa0,0x7f,0xd4,0xa7,0x07,0x09,0x32,0xd8,0x6a,0xc3,0x2d,0x62,0x86,0x72,0xa5,0x91,0x23,0xe5,0x97,0x23,0x31,0xdb,0x5d,0xff,0xe7,0x05,0x73,0x62};char key1[] = "no_thing_is_true";//0x6e6f5f74,0x68696e67,0x5f69735f,0x74727565unsigned int sum = 0;unsigned int y, z, p, rounds, e;int n = 14; //unsigned int* v = (unsigned int*)v1;unsigned int* key = (unsigned int*)key1;int i = 0;rounds = 6 + 52 / n;y = v[0];sum = (rounds * DELTA) & 0xffffffff;do //0x9E3779B9*(52/35)-0x4AB325AA，测试来要循环7次{e = sum >> 2 & 3;for (p = n - 1; p > 0; p--) //34次循环{z = v[p - 1];v[p] = (v[p] - ((((z >> 5) ^ (y << 2)) + ((y >> 3) ^ (z << 4))) ^ ((key[(p ^ e) & 3] ^ z) + (y ^ sum)))) & 0xffffffff;y = v[p];}z = v[n - 1];v[0] = (v[0] - (((key[(p ^ e) & 3] ^ z) + (y ^ sum)) ^ (((y << 2) ^ (z >> 5)) + ((z << 4) ^ (y >> 3))))) & 0xffffffff;y = v[0];sum = (sum - DELTA) & 0xffffffff;} while (--rounds);for (i = 0; i < 56; i++){printf("%c", v1[i]);}printf("\n\n");return 0;}
解密得到
之后base直接转得到flag
2、marmagic
前面的vm都没用
import itertoolsimport stringfrom zio import *s = [0x2FA4B4E6, 0x3AA763C7, 0x67057097, 0x155D753, 0x423159C0, 0x9F54FA00, 0x8AAAFCD, 0xE468BB71, 0x4CCCFB83]s += [0xB8F2D37F, 0x19794181, 0x993737EE, 0x749C7985, 0x5A9734C3, 0xEA59355A, 0xC73E3987, 0x22EB465B, 0x8B50A4CF]s += [0x3A661CBD, 0x5578F063, 0x76D83FC5, 0x699EA4A7, 0xCA324955, 0xC6A8998D, 0xFA2A09D2, 0x158673D9, 0x66CE0371]s += [0xD22BC207, 0x4000F0AC, 0x24C4BA66, 0x8523EA8A, 0x66D95F75, 0x988ADF8A, 0x76F57D90, 0x42BA7FCF, 0x22FF7C2F]s += [0xC5919DF, 0x10271DCA, 0xBE0AABA8, 0xF3001CAD, 0x3D9BFB3D, 0xBCEC5E4D, 0x10D780AC, 0x9537CA60, 0x9F024F5D]s += [0x472ECBDF, 0x20DB1A28, 0xA8FD9C14, 0x2A5800F0, 0xE1B8C757, 0x5AA73EE9, 0xEF262FE2, 0x2341E61E, 0x4F8B4C24]cmps = [0x99C57520, 0x177E3A5A, 0x717D831F, 0x69A5977F, 0x8CAF8A2D, 0x23B374E2, 0x8062C165, 0xEFE98B3F, 0x6CE0568A,0xAAB6B3F, 0x45057390, 0x2EA6430]mydict = {}for p in itertools.combinations(s, 5):sum = (p[0] + p[1] + p[2] + p[3] + p[4])&0xffffffffif sum in cmps:print ('p=%s, sum=%x' %(p, sum))mydict[sum] = pk = 0s1 = list(mydict[cmps[2*k]])s2 = list(mydict[cmps[2*k+1]])v = list(set(s1).intersection(set(s2)))[0]s1.remove(v)s2.remove(v)if k == 1:s3 = [0x79C1E7FF, 0x3092311F, 0x379526BD, 0xA776EEFC, 0xFCA2C92C, 0x20000000, 0x2FD60000, 0xE2B81F5A, 0x476EE8A2]elif k == 2:s3 = [0x58D1FFFF, 0x5B7F0D80, 0xEC3A938F, 0xCCBAB640, 0x3EA60422, 0x3F80589B, 0x436C57F8, 0xA2A000C0, 0x2E86F33C]elif k == 0:s3 = [0x7E1F777C, 0x81550ED6, 0x61D70225, 0x10602644, 0x05CD4A40, 0xC0120000, 0xF8214B14, 0x77000000, 0x5953BBF0]elif k == 3:s3 = [0x02A20833, 0x37FFFEED, 0x83220421, 0x2B8A0884, 0xF1719016, 0x552BC509, 0xCB104A8D, 0xBD4B0696, 0x47B945F8]elif k == 4:s3 = [0x32C600E7, 0x588001F3, 0x24224983, 0x3C804776, 0xA07004E0, 0x0C079035, 0xCCA4D614, 0x4780C084, 0x537A407F]elif k == 5:s3 = [0x81BFE181, 0x544F470A, 0x728880C0, 0xD613137B, 0x86970C9F, 0xE1000000, 0x9CA8076B, 0xDA10007D, 0x03062EB2]for p1 in itertools.permutations(s1):for p2 in itertools.permutations(s2):d = [p1[0], p2[0], p1[1], p2[1], v, p2[2], p1[2], p2[3], p1[3]]sum = 0for i in range(9):sum += d[i]*s3[i]sum = sum&0xffffffffc = l32(sum)is_printable = Truefor j in range(4):if c[j] not in string.printable:is_printable = Falseif is_printable:print ('d=%s, c=%s' %(d, c))
3、showyourflag
本题有幸拿到唯一一血 😸
from zio import *with open('./yourflag', 'rb') as f:d = f.read()def handle_one(d, d2, idx):common_len = 0while True:if idx >= (len(d)):breaksize = l8(d[idx])print ('idx=%x, size=%x, idx2=%x' %(idx, size, len(d2)))if size == 0x1f:d2 += d[idx+1:idx+0x21]idx += 0x21elif size < 0x1f:d2 += d[idx+1:idx+2+size]idx += size + 2elif (size >= 0x20)&(size < 0xe0):common_len += (size>>5)+2distance = ((size&0x1f)<<8) + l8(d[idx+1]) + 1s = d2[-distance:]while len(s) < common_len:s += d2[-distance:]s = s[:common_len]print ('common_len=%x, distance=%x, data=%s' %(common_len, distance, s.encode('hex')))d2 += scommon_len = 0idx += 2elif (size >= 0xe0):size2 = l8(d[idx+1])if size2 == 0xfd:common_len += 262idx += 3else:common_len += size2 + 2 + 7distance = (((size+32)&0xff) << 8) + l8(d[idx + 2]) + 1s = d2[-distance:]while len(s) < common_len:s += d2[-distance:]s = s[:common_len]print ('common_len=%x, distance=%x, data=%s' % (common_len, distance, s.encode('hex')))d2 += scommon_len = 0idx += 3return idx, d2idx = 0d2 = ''idx, d2 = handle_one(d, d2, idx)d3 = ''for i in range(len(d2)):c = (0xff-ord(d2[i]))c = ((c>>1)+(c<<7))&0xffd3 += chr(c)with open('flag3.png', 'wb') as f:f.write(d3)
Mobile
1、HaHaHaHa
先计算出各个hash加密的顺序：
from hashlib import *import hashlibop = [0xAF, 0xA1, 0xA4, 170, 0xA5, 0xAE, 0xA0, 0xA3]for i in range(len(op)):op[i] ^= 0xABfor i in range(len(op)):if (op[i] >> 3) & 1:print('SHA-512')elif (op[i]&7) == 0:print('MD2')elif (op[i]&7) == 1:print('MD5')elif (op[i]&7) == 2:print('SHA-1')elif (op[i]&7) == 3:print('SHA-224')elif (op[i]&7) == 4:print('SHA-256')elif (op[i]&7) == 5:print('SHA-384')
得到加密顺序为
SHA-256
HmacSha512
HmacSha512
MD5
HmacSha512
SHA-384
HmacSha512
HmacSha512
之后逐个爆破
SHA-256：
from hashlib import *import hmackey = 0for i in range(0x20,0x7f):for j in range(0x20,0x7f):for k in range(0x20,0x7f):for l in range(0x20,0x7f):tmp = bytes([i, j, k, l])if sha256(tmp).hexdigest()[:16] == 'fc7466e55fbf37b1':print(tmp)
Sha512：
from hashlib import *import hmaca = [4,10,15,1,14,5,11,8]b = ["WIgD1ZNZ0ilJqFpw", "4811tjOZjoiXpjdq", "ALFjcgztxnUaC89v", "ZgHzTu79Zwhoi0PB", "UYBfajKYrDFE1zJs", "yr4PBIjlJg89FpP3", "SFHqaTYDf7EeEevX", "gUwrqaE3nCxKr4Du"]for i in range(len(b)):b[i] = md5(b[i].encode()).digest()final = ["fc7466e55fbf37b1", "78b0be39e63b6837", "c2f9c805d0442203", "c11a61bb60d79dab", "869e650ee55bd9f6", "f2dda5fc021fe2bf", "305044db48fe6174", "d6659b5e2d1059f8"]def burp_512(order,key):for i in range(0x20,0x7f):for j in range(0x20,0x7f):for k in range(0x20,0x7f):for l in range(0x20,0x7f):tmp = bytes([i, j, k, l])if hmac.new(key, tmp, sha512).hexdigest()[:16] == final[order]:print(tmp)breakfor i in range(len(a)):if (a[i] >> 3) & 1:burp_512(i,b[a[i]&7])
SHA-384：
from hashlib import *import hmackey = 0for i in range(0x20,0x7f):for j in range(0x20,0x7f):for k in range(0x20,0x7f):for l in range(0x20,0x7f):tmp = bytes([i, j, k, l])if sha384(tmp).hexdigest()[:16] == 'f2dda5fc021fe2bf':print(tmp)
MD5：
from hashlib import *import hashlibfor i in range(0x20,0x7f):for j in range(0x20,0x7f):for k in range(0x20,0x7f):for l in range(0x20,0x7f):tmp = bytes([i, j, k, l])if hashlib.md5(tmp).hexdigest()[:16] == 'c11a61bb60d79dab':print(tmp)
拼接起来得到flag为 FLAG{[email protected][email protected]_C11P}
Misc
1、WeirdPhoto
crc32爆破得到真正的宽和高
#Python3爆 png长和高import binasciiimport structfor i in range(20000):#一般 20000就够wide = struct.pack('>i',i)for j in range(20000):high = struct.pack('>i',j)data = b'\x49\x48\x44\x52' + wide+ high+b'\x08\x06\x00\x00\x00'#因为是 Py3，byte和str型不能直接进行运算，要把 str写 b'...'。不然把 wide和 high写成 str(...)crc32 = binascii.crc32(data) & 0xffffffffif crc32 == 0x9E916964: # 0x9E916964是这个 png文件头的 CRC校验码，在 21~25byte处print('\n\n',i,j,crc32)print(type(data))exit(0)print(i, end=' ')
运行后爆破出真实的宽为1420，高为500，在winhex中修改后保存
打开图片，已被还原
猜了半天，猜到是栅栏密码，而且key为4
解开之后里面有一份out文件
搜索头文件里面的/BitsPerComponent
发现将原pdf文件4字节改了，应该是在pdf文件中隐藏了flag
恢复pdf文件
用wbStego4恢复，得到flag
flag{th1s_ls_thE_f1n4l_F14g_y0u_want}
实操推荐：https://www.hetianlab.com/pages/CTFLaboratory.jsp
文章来源: http://mp.weixin.qq.com/s?__biz=MjM5MTYxNjQxOA==&mid=2652882322&idx=1&sn=bd48fbf7999d084e078011533da800f6&chksm=bd59b95f8a2e30494f7ac575f2fa27b05c3613190e19c2ea5c605ec8b42d65963e5208d11c0c#rd
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