柏鹭杯2021baby_python

runwu2204 Lv6
  2023-06-21 23:48:28 2023-06-21 23:48:28 创建   2023-06-21 23:53:20 2023-06-21 23:53:20 更新    

标准的pythonexe逆向，

唯一需要注意的是需要逆向的pyc文件在pyz文件包内

image-20230621235313652

下面是源码

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# Source Generated with Decompyle++
# File: baby_core.pyc (Python 3.7)

import hashlib

def md5(s = None):
    m = hashlib.md5()
    m.update(s)
    return m.hexdigest().lower()


def main():
    secret = input('secret: ')
    if len(secret) != 48:
        return None
    if not None.isnumeric():
        return None
    values = None
    for i in range(0, 48, 3):
        values.append(int(secret[i:i + 3]))
    
    co = [
        [
            158,
            195,
            205,
            229,
            213,
            238,
            211,
            198,
            190,
            226,
            135,
            119,
            145,
            205,
            113,
            122],
        [
            234,
            256,
            185,
            253,
            244,
            134,
            102,
            117,
            190,
            106,
            131,
            205,
            198,
            234,
            162,
            218],
        [
            164,
            164,
            209,
            200,
            168,
            226,
            189,
            151,
            253,
            241,
            232,
            151,
            193,
            119,
            226,
            193],
        [
            213,
            117,
            151,
            103,
            249,
            148,
            103,
            213,
            218,
            222,
            104,
            228,
            100,
            206,
            218,
            177],
        [
            217,
            202,
            126,
            214,
            195,
            125,
            144,
            105,
            152,
            118,
            167,
            137,
            171,
            173,
            206,
            240],
        [
            160,
            134,
            131,
            135,
            186,
            213,
            146,
            129,
            125,
            139,
            174,
            205,
            177,
            240,
            194,
            181],
        [
            183,
            213,
            127,
            136,
            136,
            209,
            199,
            191,
            150,
            218,
            160,
            111,
            191,
            226,
            154,
            191],
        [
            247,
            188,
            210,
            219,
            179,
            204,
            155,
            220,
            215,
            127,
            225,
            214,
            195,
            162,
            214,
            239],
        [
            108,
            112,
            104,
            133,
            178,
            138,
            110,
            176,
            232,
            124,
            193,
            239,
            131,
            138,
            161,
            218],
        [
            140,
            213,
            142,
            181,
            179,
            173,
            203,
            208,
            184,
            129,
            129,
            119,
            122,
            152,
            186,
            124],
        [
            105,
            205,
            124,
            142,
            175,
            184,
            234,
            119,
            195,
            218,
            141,
            122,
            202,
            202,
            190,
            178],
        [
            183,
            178,
            256,
            124,
            241,
            132,
            163,
            209,
            204,
            104,
            175,
            211,
            196,
            136,
            158,
            210],
        [
            224,
            144,
            189,
            106,
            177,
            251,
            206,
            163,
            167,
            144,
            208,
            254,
            117,
            253,
            100,
            106],
        [
            251,
            251,
            136,
            170,
            145,
            177,
            175,
            124,
            193,
            188,
            193,
            198,
            208,
            171,
            151,
            230],
        [
            143,
            200,
            143,
            150,
            243,
            148,
            136,
            213,
            161,
            224,
            170,
            208,
            185,
            117,
            189,
            242],
        [
            234,
            188,
            226,
            194,
            248,
            168,
            250,
            244,
            166,
            106,
            113,
            218,
            209,
            220,
            158,
            228]]
    r = [
        472214,
        480121,
        506256,
        449505,
        433390,
        435414,
        453899,
        536361,
        423332,
        427624,
        440268,
        488759,
        469049,
        484574,
        480266,
        522818]
    for i in range(16):
        v = 0
        str1=''
        for j in range(16):
            v += co[i][j] * values[j]
		
        if v != r[i]:
            return None
    
    print('flag{ISEC-%s}' % md5(secret.encode()))

from z3 import*
flag=[Int(f'flag[{i}]')for i in range(16)]

z3脚本

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# Source Generated with Decompyle++
# File: baby_core.pyc (Python 3.7)

import hashlib

def md5(s = None):
    m = hashlib.md5()
    m.update(s)
    return m.hexdigest().lower()


co = [
    [
        158,
        195,
        205,
        229,
        213,
        238,
        211,
        198,
        190,
        226,
        135,
        119,
        145,
        205,
        113,
        122],
    [
        234,
        256,
        185,
        253,
        244,
        134,
        102,
        117,
        190,
        106,
        131,
        205,
        198,
        234,
        162,
        218],
    [
        164,
        164,
        209,
        200,
        168,
        226,
        189,
        151,
        253,
        241,
        232,
        151,
        193,
        119,
        226,
        193],
    [
        213,
        117,
        151,
        103,
        249,
        148,
        103,
        213,
        218,
        222,
        104,
        228,
        100,
        206,
        218,
        177],
    [
        217,
        202,
        126,
        214,
        195,
        125,
        144,
        105,
        152,
        118,
        167,
        137,
        171,
        173,
        206,
        240],
    [
        160,
        134,
        131,
        135,
        186,
        213,
        146,
        129,
        125,
        139,
        174,
        205,
        177,
        240,
        194,
        181],
    [
        183,
        213,
        127,
        136,
        136,
        209,
        199,
        191,
        150,
        218,
        160,
        111,
        191,
        226,
        154,
        191],
    [
        247,
        188,
        210,
        219,
        179,
        204,
        155,
        220,
        215,
        127,
        225,
        214,
        195,
        162,
        214,
        239],
    [
        108,
        112,
        104,
        133,
        178,
        138,
        110,
        176,
        232,
        124,
        193,
        239,
        131,
        138,
        161,
        218],
    [
        140,
        213,
        142,
        181,
        179,
        173,
        203,
        208,
        184,
        129,
        129,
        119,
        122,
        152,
        186,
        124],
    [
        105,
        205,
        124,
        142,
        175,
        184,
        234,
        119,
        195,
        218,
        141,
        122,
        202,
        202,
        190,
        178],
    [
        183,
        178,
        256,
        124,
        241,
        132,
        163,
        209,
        204,
        104,
        175,
        211,
        196,
        136,
        158,
        210],
    [
        224,
        144,
        189,
        106,
        177,
        251,
        206,
        163,
        167,
        144,
        208,
        254,
        117,
        253,
        100,
        106],
    [
        251,
        251,
        136,
        170,
        145,
        177,
        175,
        124,
        193,
        188,
        193,
        198,
        208,
        171,
        151,
        230],
    [
        143,
        200,
        143,
        150,
        243,
        148,
        136,
        213,
        161,
        224,
        170,
        208,
        185,
        117,
        189,
        242],
    [
        234,
        188,
        226,
        194,
        248,
        168,
        250,
        244,
        166,
        106,
        113,
        218,
        209,
        220,
        158,
        228]]
r = [
    472214,
    480121,
    506256,
    449505,
    433390,
    435414,
    453899,
    536361,
    423332,
    427624,
    440268,
    488759,
    469049,
    484574,
    480266,
    522818]

from z3 import*
f=Solver()
flag=[Int(f'flag[{i}]')for i in range(16)]
for i in range(16):
	v = 0
	str1=''
	for j in range(16):
		v += co[i][j] * flag[j]
		
	f.add(v==r[i])
str1=''
for i in range(16):
	if(f.check()==sat):
		m=f.model()
		str1+=str(m[flag[i]])
print("NSSCTF{ISEC-"+md5(str1.encode())+"}")
  • 标题: 柏鹭杯2021baby_python
  • 作者: runwu2204
  • 创建于 : 2023-06-21 23:48:28
  • 更新于 : 2023-06-21 23:53:20
  • 链接: https://runwu2204.github.io/2023/06/21/CTF WP/Re/pythonz3/柏鹭杯2021baby_python/
  • 版权声明: 本文章采用 CC BY-NC-SA 4.0 进行许可。
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柏鹭杯2021baby_python