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] = {
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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, 0x42, 0x12, 0x01, 0x00, 0x00, 0xC2, 0x06, 0x24, 0x01, 0x00,
0x9D, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 0x42, 0x12, 0x01, 0x00, 0x00,
0xC2, 0x07, 0x24, 0x01, 0x00, 0x9D, 0xC9, 0xC1, 0xD0, 0xCF, 0xCA, 0xC1, 0xC4, 0x07, 0xC4, 0x06,
0xC4, 0x05, 0xC3, 0x04, 0xC2, 0x08, 0xD1, 0xE9, 0xA3, 0x6A, 0x2A, 0xFF, 0xFF, 0xFF, 0xC5, 0x28,
0xDE, 0x03, 0x59, 0x18, 0x03, 0x0D, 0x0D, 0x12, 0x13, 0x4E, 0x4E, 0x4E, 0x1C, 0x3A, 0x3F, 0x21,
0x30, 0x21, 0x3A, 0x18, 0x08, 0x6C, 0x6C, 0x6C, 0x71, 0x17, 0x30, 0x35, 0x0E, 0x43, 0x06, 0x00,
0xCE, 0x03, 0x01, 0x04, 0x01, 0x04, 0x00, 0x00, 0x84, 0x01, 0x05, 0xD0, 0x03, 0x00, 0x01, 0x00,
0xB0, 0x01, 0x00, 0x00, 0x00, 0xA6, 0x04, 0x00, 0x01, 0x00, 0xA8, 0x04, 0x00, 0x02, 0x00, 0xAC,
0x01, 0x00, 0x03, 0x00, 0xD1, 0xE9, 0xB6, 0xA3, 0xEA, 0x0D, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04,
0xEE, 0x00, 0x00, 0x00, 0xEF, 0x29, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0x16, 0x01, 0x00, 0x00,
0xD1, 0xB5, 0x47, 0x9D, 0xEF, 0x0E, 0xD1, 0xB5, 0x47, 0xC9, 0x38, 0xE6, 0x00, 0x00, 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 74
72 10 73 74 72 32 6c 6f
6e 67 10 73 64 66 73 66
73 64 66 0e 73 74 72 32
48 65 78 0e 68 65 78 32
73 74 72 0c 78 78 78 66
73 73 08 6d 61 69 6e 08
61 72 67 73 82 01 41 42
43 44 45 46 47 48 49 4a
4b 4c 4d 4e 4f 50 51 52
53 54 55 56 57 58 59 5a
61 62 63 64 65 66 67 68
69 6a 6b 6c 6d 6e 6f 70
71 72 73 74 75 76 77 78
79 7a 30 31 32 33 34 35
36 37 38 39 2b 2f 3d 0e
5f 6b 65 79 53 74 72 0a
64 66 73 66 73 14 73 63
72 69 70 74 41 72 67 73
0a 73 68 69 66 74 0a 65
72 72 6f 72 20 2e 2f 74
65 73 74 5f 65 6e 63 6f
64 65 2e 6a 73 02 76 02
77 04 76 6c 04 73 6c 02
69 18 66 72 6f 6d 43 68
61 72 43 6f 64 65 12 73
75 62 73 74 72 69 6e 67
02 73 06 6c 65 6e 14 63
68 61 72 43 6f 64 65 41
74 06 73 74 72 06 6b 65
79 02 6b 02 6e 02 7a 02
79 0a 64 65 6c 74 61 04
6d 78 02 65 02 71 06 73
75 6d 02 70 0a 66 6c 6f
6f 72 0c 6f 75 74 70 75
74 08 63 68 72 31 10 70
61 72 73 65 49 6e 74 0c
73 75 62 73 74 72 08 63
68 72 32 08 63 68 72 33
08 65 6e 63 31 08 65 6e
63 32 08 65 6e 63 33 08
65 6e 63 34 0a 69 73 4e
61 4e 0c 63 68 61 72 41
74 12 64 66 73 66 64 73
66 73 64 0c 66 77 64 65
72 66 0a 70 72 69 6e 74
18 79 6f 75 72 20 69 6e
70 75 74 3a 20 20 6e 6f
5f 74 68 69 6e 67 5f 69
73 5f 74 72 75 65 0e 64
66 64 66 77 66 33 e0 01
30 35 61 65 64 30 63 65
34 34 31 66 38 30 62 35
62 63 33 36 61 66 34 63
36 39 38 35 30 39 66 63
36 63 63 33 63 39 37 31
34 36 33 35 33 64 65 35
61 39 35 63 36 61 62 65
61 30 37 66 64 34 61 37
30 37 30 39 33 32 64 38
36 61 63 33 32 64 36 32
38 36 37 32 61 35 39 31
32 33 65 35 39 37 32 33
33 31 64 62 35 64 66 66
65 37 30 35 37 33 36 32
06 79 65 73 }
020e: 0e function {
020f: 00 06 00 a0 01 00 01 00
03 00 08 e4 01 01 name: ""
args=0 vars=1 defargs=0 closures=0 cpool=8
stack=3 bclen=228 locals=1
vars {
021d: a2 01 00 00 00 name: ""
}
bytecode {
0222: 3f e1 00 00 00 40 3f e2
00 00 00 40 3f e3 00 00
00 40 3f e4 00 00 00 40
3f e5 00 00 00 40 3f e6
00 00 00 40 3f e7 00 00
00 40 3f e8 00 00 00 00
c0 00 40 e1 00 00 00 00
c0 01 40 e2 00 00 00 00
c0 02 40 e3 00 00 00 00
c0 03 40 e4 00 00 00 00
c0 04 40 e5 00 00 00 00
c0 05 40 e6 00 00 00 00
c0 07 40 e7 00 00 00 00
3e e8 00 00 00 00 38 e6
00 00 00 04 e9 00 00 00
15 43 ea 00 00 00 c9 38
e6 00 00 00 c0 06 15 43
eb 00 00 00 c9 06 c9 37
ec 00 00 00 f4 eb 1d 38
ec 00 00 00 11 39 e8 00
00 00 c9 38 e8 00 00 00
42 ed 00 00 00 24 00 00
c9 ec 25 06 c9 37 4d 00
00 00 f4 eb 0f 38 4d 00
00 00 11 39 e8 00 00 00
c9 ec 0d 04 ee 00 00 00
11 39 e8 00 00 00 c9 38
e7 00 00 00 38 e8 00 00
00 ef cd 28 at 1, fixup atom: long2str
at 7, fixup atom: str2long
at 13, fixup atom: sdfsfsdf
at 19, fixup atom: str2Hex
at 25, fixup atom: hex2str
at 31, fixup atom: xxxfss
at 37, fixup atom: main
at 43, fixup atom: args
at 51, fixup atom: long2str
at 59, fixup atom: str2long
at 67, fixup atom: sdfsfsdf
at 75, fixup atom: str2Hex
at 83, fixup atom: hex2str
at 91, fixup atom: xxxfss
at 99, fixup atom: main
at 105, fixup atom: args
at 111, fixup atom: xxxfss
at 116, fixup atom: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
at 122, fixup atom: _keyStr
at 128, fixup atom: xxxfss
at 136, fixup atom: dfsfs
at 144, fixup atom: scriptArgs
at 152, fixup atom: scriptArgs
at 158, fixup atom: args
at 164, fixup atom: args
at 169, fixup atom: shift
at 182, fixup atom: arguments
at 190, fixup atom: arguments
at 196, fixup atom: args
at 204, fixup atom: error
at 210, fixup atom: args
at 216, fixup atom: main
at 221, fixup atom: args
}
debug {
0306: de 03 01 13 f1 00 3e b0
01 58 00 05 36 00 09 40
35 3f 49 3f 3f 0d 41 filename: "./test_encode.js"
}
cpool {
031d: 0e function {
031e: 43 06 00 c2 03 02 03 02
09 00 01 6e 05 name: long2str
args=2 vars=3 defargs=2 closures=0 cpool=1
stack=9 bclen=110 locals=5
vars {
032b: e0 03 00 01 00 name: v
0330: e2 03 00 01 00 name: w
0335: e4 03 00 00 00 name: vl
033a: e6 03 00 01 00 name: sl
033f: e8 03 00 02 00 name: i
}
bytecode {
0344: d1 e9 c9 d1 c5 b6 9e 47
bf 00 ad ca b5 cb c7 c5
a3 ea 3b d1 c7 71 38 99
00 00 00 42 f5 00 00 00
d1 c7 47 be ff 00 ad d1
c7 47 bd 08 a2 be ff 00
ad d1 c7 47 bd 10 a2 be
ff 00 ad d1 c7 47 bd 18
a2 be ff 00 ad 24 04 00
49 93 02 ec c2 d2 ea 15
d1 42 5b 00 00 00 c1 24
01 00 42 f6 00 00 00 b5
c6 25 02 00 d1 42 5b 00
00 00 c1 25 01 00 at 23, fixup atom: String
at 28, fixup atom: fromCharCode
at 82, fixup atom: join
at 91, fixup atom: substring
at 102, fixup atom: join
}
debug {
03b2: de 03 01 0b 03 12 30 27
67 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: long2str
args: v w
locals:
0: var vl
1: var sl
2: var i
stack_size: 9
opcodes:
get_arg0 0: v
get_length
put_loc0 0: vl
get_arg0 0: v
get_loc0 0: vl
push_1 1
sub
get_array_el
push_const8 0: 4294967295
and
put_loc1 1: sl
push_0 0
put_loc2 2: i
14: get_loc2 2: i
get_loc0 0: vl
lt
if_false8 77
get_arg0 0: v
get_loc2 2: i
to_propkey2
get_var String
get_field2 fromCharCode
get_arg0 0: v
get_loc2 2: i
get_array_el
push_i16 255
and
get_arg0 0: v
get_loc2 2: i
get_array_el
push_i8 8
shr
push_i16 255
and
get_arg0 0: v
get_loc2 2: i
get_array_el
push_i8 16
shr
push_i16 255
and
get_arg0 0: v
get_loc2 2: i
get_array_el
push_i8 24
shr
push_i16 255
and
call_method 4
put_array_el
inc_loc 2: i
goto8 14
77: get_arg1 1: w
if_false8 100
get_arg0 0: v
get_field2 join
push_empty_string
call_method 1
get_field2 substring
push_0 0
get_loc1 1: sl
tail_call_method 2
100: get_arg0 0: v
get_field2 join
push_empty_string
tail_call_method 1
}
03ca: 0e function {
03cb: 43 06 00 c4 03 02 03 02
07 00 00 5d 05 name: str2long
args=2 vars=3 defargs=2 closures=0 cpool=0
stack=7 bclen=93 locals=5
vars {
03d8: ee 03 00 01 00 name: s
03dd: e2 03 00 01 00 name: w
03e2: f0 03 00 00 00 name: len
03e7: e0 03 00 01 00 name: v
03ec: e8 03 00 02 00 name: i
}
bytecode {
03f1: d1 e9 c9 26 00 00 ca b5
cb c7 c5 a3 ea 46 c6 c7
b7 a1 71 d1 42 f9 00 00
00 c7 24 01 00 d1 42 f9
00 00 00 c7 b6 9d 24 01
00 bd 08 a0 af d1 42 f9
00 00 00 c7 b7 9d 24 01
00 bd 10 a0 af d1 42 f9
00 00 00 c7 b8 9d 24 01
00 bd 18 a0 af 49 b9 94
02 ec b7 d2 ea 06 c6 c6
e9 c5 49 c6 28 at 21, fixup atom: charCodeAt
at 31, fixup atom: charCodeAt
at 47, fixup atom: charCodeAt
at 63, fixup atom: charCodeAt
}
debug {
044e: de 03 13 0b 03 12 17 27
4e 53 53 58 1c 12 1d filename: "./test_encode.js"
}
./test_encode.js:19: function: str2long
args: s w
locals:
0: var len
1: var v
2: var i
stack_size: 7
opcodes:
get_arg0 0: s
get_length
put_loc0 0: len
array_from 0
put_loc1 1: v
push_0 0
put_loc2 2: i
9: get_loc2 2: i
get_loc0 0: len
lt
if_false8 83
get_loc1 1: v
get_loc2 2: i
push_2 2
sar
to_propkey2
get_arg0 0: s
get_field2 charCodeAt
get_loc2 2: i
call_method 1
get_arg0 0: s
get_field2 charCodeAt
get_loc2 2: i
push_1 1
add
call_method 1
push_i8 8
shl
or
get_arg0 0: s
get_field2 charCodeAt
get_loc2 2: i
push_2 2
add
call_method 1
push_i8 16
shl
or
get_arg0 0: s
get_field2 charCodeAt
get_loc2 2: i
push_3 3
add
call_method 1
push_i8 24
shl
or
put_array_el
push_4 4
add_loc 2: i
goto8 9
83: get_arg1 1: w
if_false8 91
get_loc1 1: v
get_loc1 1: v
get_length
get_loc0 0: len
put_array_el
91: get_loc1 1: v
return
}
045d: 0e function {
045e: 43 06 00 c6 03 02 0b 02
06 00 04 f8 01 0d name: sdfsfsdf
args=2 vars=11 defargs=2 closures=0 cpool=4
stack=6 bclen=248 locals=13
vars {
046c: f4 03 00 01 00 name: str
0471: f6 03 00 01 00 name: key
0476: e0 03 00 00 00 name: v
047b: f8 03 00 01 00 name: k
0480: fa 03 00 02 00 name: n
0485: fc 03 00 03 00 name: z
048a: fe 03 00 04 00 name: y
048f: 80 04 00 05 00 name: delta
0494: 82 04 00 06 00 name: mx
0499: 84 04 00 07 00 name: e
049e: 86 04 00 08 00 name: q
04a3: 88 04 00 09 00 name: sum
04a8: 8a 04 00 0a 00 name: p
}
bytecode {
04ad: d1 c1 a9 ea 03 c1 28 38
e2 00 00 00 d1 0a f0 c9
38 e2 00 00 00 d2 09 f0
ca c5 e9 b6 9e cb c5 c7
47 cc c5 b5 47 c3 04 bf
00 c3 05 38 9d 00 00 00
42 06 01 00 00 bb bd 34
c7 b6 9d 9b 9d 24 01 00
c3 08 b5 c3 09 c2 08 90
c3 08 b5 a5 69 9b 00 00
00 c2 09 c2 05 9d bf 01
ad c4 09 b7 a2 b8 ad c3
07 b5 c3 0a c2 0a c7 a3
ea 43 c5 c2 0a b6 9d 47
c3 04 c8 ba a2 c2 04 b7
a0 ae c2 04 b8 a2 c8 b9
a0 ae 9d c2 09 c2 04 ae
c6 c2 0a b8 ad c2 07 ae
47 c8 ae 9d ae c3 06 c5
c2 0a 71 c5 c2 0a 47 c2
06 9d bf 02 ad 16 49 cc
93 0a ec b9 c5 b5 47 c3
04 c8 ba a2 c2 04 b7 a0
ae c2 04 b8 a2 c8 b9 a0
ae 9d c2 09 c2 04 ae c6
c2 0a b8 ad c2 07 ae 47
c8 ae 9d ae c3 06 c5 c7
71 c5 c7 47 c2 06 9d bf
03 ad 16 49 cc ed 5f ff
38 e4 00 00 00 38 e1 00
00 00 c5 09 f0 23 01 00 at 8, fixup atom: str2long
at 17, fixup atom: str2long
at 44, fixup atom: Math
at 49, fixup atom: floor
at 233, fixup atom: str2Hex
at 238, fixup atom: long2str
}
debug {
05a5: de 03 23 15 03 1c 08 08
30 30 1d 44 85 3f 35 21
30 2b bc 58 17 1c bc 4e
13 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: sdfsfsdf
args: str key
locals:
0: var v
1: var k
2: var n
3: var z
4: var y
5: var delta
6: var mx
7: var e
8: var q
9: var sum
10: var p
stack_size: 6
opcodes:
get_arg0 0: str
push_empty_string
eq
if_false8 7
push_empty_string
return
7: get_var str2long
get_arg0 0: str
push_true
call2 2
put_loc0 0: v
get_var str2long
get_arg1 1: key
push_false
call2 2
put_loc1 1: k
get_loc0 0: v
get_length
push_1 1
sub
put_loc2 2: n
get_loc0 0: v
get_loc2 2: n
get_array_el
put_loc3 3: z
get_loc0 0: v
push_0 0
get_array_el
put_loc8 4: y
push_const8 0: 2654435769
put_loc8 5: delta
get_var Math
get_field2 floor
push_6 6
push_i8 52
get_loc2 2: n
push_1 1
add
div
add
call_method 1
put_loc8 8: q
push_0 0
put_loc8 9: sum
69: get_loc8 8: q
post_dec
put_loc8 8: q
push_0 0
gt
if_false 232
get_loc8 9: sum
get_loc8 5: delta
add
push_const8 1: 4294967295
and
set_loc8 9: sum
push_2 2
shr
push_3 3
and
put_loc8 7: e
push_0 0
put_loc8 10: p
100: get_loc8 10: p
get_loc2 2: n
lt
if_false8 172
get_loc0 0: v
get_loc8 10: p
push_1 1
add
get_array_el
put_loc8 4: y
get_loc3 3: z
push_5 5
shr
get_loc8 4: y
push_2 2
shl
xor
get_loc8 4: y
push_3 3
shr
get_loc3 3: z
push_4 4
shl
xor
add
get_loc8 9: sum
get_loc8 4: y
xor
get_loc1 1: k
get_loc8 10: p
push_3 3
and
get_loc8 7: e
xor
get_array_el
get_loc3 3: z
xor
add
xor
put_loc8 6: mx
get_loc0 0: v
get_loc8 10: p
to_propkey2
get_loc0 0: v
get_loc8 10: p
get_array_el
get_loc8 6: mx
add
push_const8 2: 4294967295
and
insert3
put_array_el
put_loc3 3: z
inc_loc 10: p
goto8 100
172: get_loc0 0: v
push_0 0
get_array_el
put_loc8 4: y
get_loc3 3: z
push_5 5
shr
get_loc8 4: y
push_2 2
shl
xor
get_loc8 4: y
push_3 3
shr
get_loc3 3: z
push_4 4
shl
xor
add
get_loc8 9: sum
get_loc8 4: y
xor
get_loc1 1: k
get_loc8 10: p
push_3 3
and
get_loc8 7: e
xor
get_array_el
get_loc3 3: z
xor
add
xor
put_loc8 6: mx
get_loc0 0: v
get_loc2 2: n
to_propkey2
get_loc0 0: v
get_loc2 2: n
get_array_el
get_loc8 6: mx
add
push_const8 3: 4294967295
and
insert3
put_array_el
put_loc3 3: z
goto16 69
232: get_var str2Hex
get_var long2str
get_loc0 0: v
push_false
call2 2
tail_call 1
}
05e2: 0e function {
05e3: 43 06 00 c8 03 01 03 01
04 00 01 32 04 name: str2Hex
args=1 vars=3 defargs=1 closures=0 cpool=1
stack=4 bclen=50 locals=4
vars {
05f0: b0 01 00 01 00 name: input
05f5: 8e 04 00 00 00 name: output
05fa: 90 04 00 01 00 name: chr1
05ff: e8 03 00 02 00 name: i
}
bytecode {
0604: c1 c9 c1 ca b5 cb d1 42
f9 00 00 00 c7 91 cb 24
01 00 42 37 00 00 00 bd
10 24 01 00 ce e9 b6 a9
ea 06 bf 00 c6 9d ca c6
94 00 c7 d1 e9 a3 eb d7
c5 28 at 8, fixup atom: charCodeAt
at 19, fixup atom: toString
}
debug {
0636: de 03 3e 08 03 0d 0d 0e
76 35 12 21 filename: "./test_encode.js"
}
cpool {
0642: 07 string {
1"0"
0643: 02 30 }
}
./test_encode.js:62: function: str2Hex
args: input
locals:
0: var output
1: var chr1
2: var i
stack_size: 4
opcodes:
push_empty_string
put_loc0 0: output
push_empty_string
put_loc1 1: chr1
push_0 0
put_loc2 2: i
6: get_arg0 0: input
get_field2 charCodeAt
get_loc2 2: i
post_inc
put_loc2 2: i
call_method 1
get_field2 toString
push_i8 16
call_method 1
set_loc1 1: chr1
get_length
push_1 1
eq
if_false8 39
push_const8 0: 1"0"
get_loc1 1: chr1
add
put_loc1 1: chr1
39: get_loc1 1: chr1
add_loc 0: output
get_loc2 2: i
get_arg0 0: input
get_length
lt
if_true8 6
get_loc0 0: output
return
}
0645: 0e function {
0646: 43 06 00 ca 03 01 03 01
06 00 00 52 04 name: hex2str
args=1 vars=3 defargs=1 closures=0 cpool=0
stack=6 bclen=82 locals=4
vars {
0653: b0 01 00 01 00 name: input
0658: 8e 04 00 00 00 name: output
065d: e8 03 00 01 00 name: i
0662: f8 03 00 02 00 name: k
}
bytecode {
0667: c1 c9 b5 ca c6 d1 e9 a3
ea 47 38 09 01 00 00 d1
42 0a 01 00 00 c6 b6 24
02 00 bd 10 f0 b9 a0 38
09 01 00 00 d1 42 0a 01
00 00 c6 8f ce b6 24 02
00 bd 10 f0 af cf be ff
00 ad cb c5 38 99 00 00
00 42 f5 00 00 00 c7 24
01 00 9d c9 93 01 ec b5
c5 28 at 11, fixup atom: parseInt
at 17, fixup atom: substr
at 32, fixup atom: parseInt
at 38, fixup atom: substr
at 61, fixup atom: String
at 66, fixup atom: fromCharCode
}
debug {
06b9: de 03 4a 09 03 0d 0d 21
da 21 58 0d 0d filename: "./test_encode.js"
}
./test_encode.js:74: function: hex2str
args: input
locals:
0: var output
1: var i
2: var k
stack_size: 6
opcodes:
push_empty_string
put_loc0 0: output
push_0 0
put_loc1 1: i
4: get_loc1 1: i
get_arg0 0: input
get_length
lt
if_false8 80
get_var parseInt
get_arg0 0: input
get_field2 substr
get_loc1 1: i
push_1 1
call_method 2
push_i8 16
call2 2
push_4 4
shl
get_var parseInt
get_arg0 0: input
get_field2 substr
get_loc1 1: i
inc
set_loc1 1: i
push_1 1
call_method 2
push_i8 16
call2 2
or
set_loc2 2: k
push_i16 255
and
put_loc2 2: k
get_loc0 0: output
get_var String
get_field2 fromCharCode
get_loc2 2: k
call_method 1
add
put_loc0 0: output
inc_loc 1: i
goto8 4
80: get_loc0 0: output
return
}
06c6: 0e function {
06c7: 43 06 00 cc 03 00 00 00
00 00 00 01 00 name: xxxfss
args=0 vars=0 defargs=0 closures=0 cpool=0
stack=0 bclen=1 locals=0
bytecode {
06d4: 29 }
debug {
06d5: de 03 56 01 03 filename: "./test_encode.js"
}
./test_encode.js:86: function: xxxfss
stack_size: 0
opcodes:
return_undef
}
06da: 0e function {
06db: 43 06 00 00 01 09 01 04
00 00 e6 01 0a name: ""
args=1 vars=9 defargs=1 closures=0 cpool=0
stack=4 bclen=230 locals=10
vars {
06e8: b0 01 00 01 00 name: input
06ed: 8e 04 00 00 00 name: output
06f2: 90 04 00 01 00 name: chr1
06f7: 96 04 00 02 00 name: chr2
06fc: 98 04 00 03 00 name: chr3
0701: 9a 04 00 04 00 name: enc1
0706: 9c 04 00 05 00 name: enc2
070b: 9e 04 00 06 00 name: enc3
0710: a0 04 00 07 00 name: enc4
0715: e8 03 00 08 00 name: i
}
bytecode {
071a: c1 c9 c1 cc c1 c3 07 b5
c3 08 d1 42 f9 00 00 00
c2 08 91 c3 08 24 01 00
ca d1 42 f9 00 00 00 c2
08 91 c3 08 24 01 00 cb
d1 42 f9 00 00 00 c2 08
91 c3 08 24 01 00 cc c6
b7 a1 c3 04 c6 b8 ad b9
a0 c7 b9 a1 af c3 05 c7
bd 0f ad b7 a0 c8 bb a1
af c3 06 c8 bd 3f ad c3
07 38 11 01 00 00 c7 ef
ea 09 bd 40 c4 07 c3 06
ec 0e 38 11 01 00 00 c8
ef ea 05 bd 40 c3 07 c5
38 e6 00 00 00 41 ea 00
00 00 42 12 01 00 00 c2
04 24 01 00 9d 38 e6 00
00 00 41 ea 00 00 00 42
12 01 00 00 c2 05 24 01
00 9d 38 e6 00 00 00 41
ea 00 00 00 42 12 01 00
00 c2 06 24 01 00 9d 38
e6 00 00 00 41 ea 00 00
00 42 12 01 00 00 c2 07
24 01 00 9d c9 c1 d0 cf
ca c1 c4 07 c4 06 c4 05
c3 04 c2 08 d1 e9 a3 6a
2a ff ff ff c5 28 at 12, fixup atom: charCodeAt
at 27, fixup atom: charCodeAt
at 42, fixup atom: charCodeAt
at 90, fixup atom: isNaN
at 107, fixup atom: isNaN
at 121, fixup atom: xxxfss
at 126, fixup atom: _keyStr
at 131, fixup atom: charAt
at 142, fixup atom: xxxfss
at 147, fixup atom: _keyStr
at 152, fixup atom: charAt
at 163, fixup atom: xxxfss
at 168, fixup atom: _keyStr
at 173, fixup atom: charAt
at 184, fixup atom: xxxfss
at 189, fixup atom: _keyStr
at 194, fixup atom: charAt
}
debug {
0800: de 03 59 18 03 0d 0d 12
13 4e 4e 4e 1c 3a 3f 21
30 21 3a 18 08 6c 6c 6c
71 17 30 35 filename: "./test_encode.js"
}
./test_encode.js:89: function:
args: input
locals:
0: var output
1: var chr1
2: var chr2
3: var chr3
4: var enc1
5: var enc2
6: var enc3
7: var enc4
8: var i
stack_size: 4
opcodes:
push_empty_string
put_loc0 0: output
push_empty_string
put_loc3 3: chr3
push_empty_string
put_loc8 7: enc4
push_0 0
put_loc8 8: i
10: get_arg0 0: input
get_field2 charCodeAt
get_loc8 8: i
post_inc
put_loc8 8: i
call_method 1
put_loc1 1: chr1
get_arg0 0: input
get_field2 charCodeAt
get_loc8 8: i
post_inc
put_loc8 8: i
call_method 1
put_loc2 2: chr2
get_arg0 0: input
get_field2 charCodeAt
get_loc8 8: i
post_inc
put_loc8 8: i
call_method 1
put_loc3 3: chr3
get_loc1 1: chr1
push_2 2
sar
put_loc8 4: enc1
get_loc1 1: chr1
push_3 3
and
push_4 4
shl
get_loc2 2: chr2
push_4 4
sar
or
put_loc8 5: enc2
get_loc2 2: chr2
push_i8 15
and
push_2 2
shl
get_loc3 3: chr3
push_6 6
sar
or
put_loc8 6: enc3
get_loc3 3: chr3
push_i8 63
and
put_loc8 7: enc4
get_var isNaN
get_loc2 2: chr2
call1 1
if_false8 106
push_i8 64
set_loc8 7: enc4
put_loc8 6: enc3
goto8 119
106: get_var isNaN
get_loc3 3: chr3
call1 1
if_false8 119
push_i8 64
put_loc8 7: enc4
119: get_loc0 0: output
get_var xxxfss
get_field _keyStr
get_field2 charAt
get_loc8 4: enc1
call_method 1
add
get_var xxxfss
get_field _keyStr
get_field2 charAt
get_loc8 5: enc2
call_method 1
add
get_var xxxfss
get_field _keyStr
get_field2 charAt
get_loc8 6: enc3
call_method 1
add
get_var xxxfss
get_field _keyStr
get_field2 charAt
get_loc8 7: enc4
call_method 1
add
put_loc0 0: output
push_empty_string
set_loc3 3: chr3
set_loc2 2: chr2
put_loc1 1: chr1
push_empty_string
set_loc8 7: enc4
set_loc8 6: enc3
set_loc8 5: enc2
put_loc8 4: enc1
get_loc8 8: i
get_arg0 0: input
get_length
lt
if_true 10
get_loc0 0: output
return
}
081c: 0e function {
081d: 43 06 00 ce 03 01 04 01
04 00 00 84 01 05 name: main
args=1 vars=4 defargs=1 closures=0 cpool=0
stack=4 bclen=132 locals=5
vars {
082b: d0 03 00 01 00 name: args
0830: b0 01 00 00 00 name: input
0835: a6 04 00 01 00 name: dfsfdsfsd
083a: a8 04 00 02 00 name: fwderf
083f: ac 01 00 03 00 name: target
}
bytecode {
0844: d1 e9 b6 a3 ea 0d 38 15
01 00 00 04 ee 00 00 00
ef 29 38 15 01 00 00 04
16 01 00 00 d1 b5 47 9d
ef 0e d1 b5 47 c9 38 e6
00 00 00 42 eb 00 00 00
c5 24 01 00 ca 04 17 01
00 00 11 39 18 01 00 00
0e 38 e3 00 00 00 c6 38
18 01 00 00 f0 cf e9 bd
70 aa ea 0d 38 15 01 00
00 04 ee 00 00 00 ef 29
04 19 01 00 00 cc c7 c8
a9 ea 0e 38 15 01 00 00
04 1a 01 00 00 ef 0e 29
38 15 01 00 00 04 ee 00
00 00 ef 29 at 7, fixup atom: print
at 12, fixup atom: error
at 19, fixup atom: print
at 24, fixup atom: "your input: "
at 39, fixup atom: xxxfss
at 44, fixup atom: dfsfs
at 54, fixup atom: no_thing_is_true
at 60, fixup atom: dfdfwf3
at 66, fixup atom: sdfsfsdf
at 72, fixup atom: dfdfwf3
at 85, fixup atom: print
at 90, fixup atom: error
at 97, fixup atom: "05aed0ce441f80b5bc36af4c698509fc6cc3c97146353de5a95c6abea07fd4a7070932d86ac32d628672a59123e5972331db5dffe7057362"
at 108, fixup atom: print
at 113, fixup atom: yes
at 121, fixup atom: print
at 126, fixup atom: error
}
debug {
08c8: de 03 76 11 03 21 3b 08
54 17 4f 3f 40 26 3b 09
21 1d 3f 09 3c filename: "./test_encode.js"
}
./test_encode.js:118: function: main
args: args
locals:
0: var input
1: var dfsfdsfsd
2: var fwderf
3: var target
stack_size: 4
opcodes:
get_arg0 0: args
get_length
push_1 1
lt
if_false8 18
get_var print
push_atom_value error
call1 1
return_undef
18: get_var print
push_atom_value "your input: "
get_arg0 0: args
push_0 0
get_array_el
add
call1 1
drop
get_arg0 0: args
push_0 0
get_array_el
put_loc0 0: input
get_var xxxfss
get_field2 dfsfs
get_loc0 0: input
call_method 1
put_loc1 1: dfsfdsfsd
push_atom_value no_thing_is_true
dup
put_var dfdfwf3
drop
get_var sdfsfsdf
get_loc1 1: dfsfdsfsd
get_var dfdfwf3
call2 2
set_loc2 2: fwderf
get_length
push_i8 112
neq
if_false8 96
get_var print
push_atom_value error
call1 1
return_undef
96: push_atom_value "05aed0ce441f80b5bc36af4c698509fc6cc3c97146353de5a95c6abea07fd4a7070932d86ac32d628672a59123e5972331db5dffe7057362"
put_loc3 3: target
get_loc2 2: fwderf
get_loc3 3: target
eq
if_false8 120
get_var print
push_atom_value yes
call1 1
drop
return_undef
120: get_var print
push_atom_value error
call1 1
return_undef
}
}
./test_encode.js:1: function:
locals:
0: var
stack_size: 3
opcodes:
check_define_var long2str,64
check_define_var str2long,64
check_define_var sdfsfsdf,64
check_define_var str2Hex,64
check_define_var hex2str,64
check_define_var xxxfss,64
check_define_var main,64
check_define_var args,0
fclosure8 0: [bytecode long2str]
define_func long2str,0
fclosure8 1: [bytecode str2long]
define_func str2long,0
fclosure8 2: [bytecode sdfsfsdf]
define_func sdfsfsdf,0
fclosure8 3: [bytecode str2Hex]
define_func str2Hex,0
fclosure8 4: [bytecode hex2str]
define_func hex2str,0
fclosure8 5: [bytecode xxxfss]
define_func xxxfss,0
fclosure8 7: [bytecode main]
define_func main,0
define_var args,0
get_var xxxfss
push_atom_value "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
insert2
put_field _keyStr
put_loc0 0: ""
get_var xxxfss
fclosure8 6: [bytecode ]
insert2
put_field dfsfs
put_loc0 0: ""
undefined
put_loc0 0: ""
get_var_undef scriptArgs
typeof_is_undefined
if_true8 179
get_var scriptArgs
dup
put_var args
put_loc0 0: ""
get_var args
get_field2 shift
call_method 0
put_loc0 0: ""
goto8 215
179: undefined
put_loc0 0: ""
get_var_undef arguments
typeof_is_undefined
if_true8 203
get_var arguments
dup
put_var args
put_loc0 0: ""
goto8 215
203: push_atom_value error
dup
put_var args
put_loc0 0: ""
215: get_var main
get_var args
call1 1
set_loc0 0: ""
return
}
error一共有这些函数
eval、long2str、str2long、sdfsfsdf、str2Hex、hex2str、xxxfss、、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
#include
#define DELTA 0x9e3779b9//0x61C88647
int 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,0x74727565
unsigned 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 > 3) ^ (z 5)) + ((z > 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
前面的vm都没用
import itertools
import string
from 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])&0xffffffff
if sum in cmps:
print ('p=%s, sum=%x' %(p, sum))
mydict[sum] = p
k = 0
s1 = 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 = 0
for i in range(9):
sum += d[i]*s3[i]
sum = sum&0xffffffff
c = l32(sum)
is_printable = True
for j in range(4):
if c[j] not in string.printable:
is_printable = False
if is_printable:
print ('d=%s, c=%s' %(d, c))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 = 0
while True:
if idx >= (len(d)):
break
size = l8(d[idx])
print ('idx=%x, size=%x, idx2=%x' %(idx, size, len(d2)))
if size == 0x1f:
d2 += d[idx+1:idx+0x21]
idx += 0x21
elif size < 0x1f:
d2 += d[idx+1:idx+2+size]
idx += size + 2
elif (size >= 0x20)&(size < 0xe0):
common_len += (size>>5)+2
distance = ((size&0x1f)1)+(c 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 hmac
key = 0
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 sha256(tmp).hexdigest()[:16] == 'fc7466e55fbf37b1':
print(tmp)
Sha512：
from hashlib import *
import hmac
a = [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)
break
for i in range(len(a)):
if (a[i] >> 3) & 1:
burp_512(i,b[a[i]&7])
SHA-384：
from hashlib import *
import hmac
key = 0
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 sha384(tmp).hexdigest()[:16] == 'f2dda5fc021fe2bf':
print(tmp)
MD5：
from hashlib import *
import hashlib
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 hashlib.md5(tmp).hexdigest()[:16] == 'c11a61bb60d79dab':
print(tmp)
拼接起来得到flag为 FLAG{H@5H_15_7H3_8@PP1N355_C11P}
Misc 1、WeirdPhotocrc32爆破得到真正的宽和高
#Python3爆 png长和高
import binascii
import struct
for 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) & 0xffffffff
if 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
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