2023羊城杯RE部分
vm_wo
代码copy下来调了一下
vm_body[0]=input[i]
vm_body[1]=vm_body[0]>>1
v12=vm_body[0]
vm_body[2]=v12<<7
vm_body[0]=vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[3]
vm_body[0]=vm_body[0]
vm_body[1]=vm_body[0]>>2
v12=vm_body[0]
vm_body[2]=v12<<6
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[4]
vm_body[0]=vm_body[0]
vm_body[1]=vm_body[0]>>3
v12=vm_body[0]
vm_body[2]=v12<<5
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[5]
vm_body[0]=vm_body[0]
vm_body[1]=vm_body[0]>>4
v12=vm_body[0]
vm_body[2]=v12<<4
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[6]
enc[i]=(vm_body[0] >> 5) | (8 * vm_body[0])
enc=[0xDF, 0xD5, 0xF1, 0xD1, 0xFF, 0xDB, 0xA1, 0xA5, 0x89, 0xBD, 0xE9, 0x95, 0xB3, 0x9D, 0xE9, 0xB3, 0x85, 0x99, 0x87, 0xBF, 0xE9, 0xB1, 0x89, 0xE9, 0x91, 0x89, 0x89, 0x8F, 0xAD]
from z3 import *
s=Solver()
temp=[0]*len(enc)
vm_body=[0,0,0,0xef,0xbe,0xed,0xbe,0x00]
input = [BitVec("input[%d]"%i,9) for i in range(len(enc))]
for i in range(len(enc)):
vm_body[0]=input[i]
vm_body[1]=vm_body[0]>>1
v12=vm_body[0]
vm_body[2]=v12<<7
vm_body[2]&=0xff
vm_body[0]=vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[3]
# vm_body[0]=vm_body[1]
vm_body[1]=vm_body[0]>>2
v12=vm_body[0]
vm_body[2]=v12<<6
vm_body[2] &= 0xff
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[4]
#vm_body[0]=vm_body[1]
vm_body[1]=vm_body[0]>>3
v12=vm_body[0]
vm_body[2]=v12<<5
vm_body[2] &= 0xff
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[5]
# vm_body[0]=vm_body[1]
vm_body[1]=vm_body[0]>>4
v12=vm_body[0]
vm_body[2]=v12<<4
vm_body[2] &= 0xff
vm_body[0] = vm_body[2] | vm_body[1]
vm_body[0] ^= vm_body[6]
temp[i]=(vm_body[0] >> 5) | (vm_body[0]<<3)
for i in range(len(enc)):
s.add(enc[i]==temp[i]&0xff)
if s.check()==sat:
ans = s.model()
input = [BitVec("input[%d]" % i, 9) for i in range(29)]
for i in input:
print(chr(ans[i].as_long()),end='')
ez加密器
调试拿到enc
[7, 35, 16, 93, 92, 18, 33, 125, 205, 195, 96, 31, 94, 203, 84, 218, 156, 206, 194, 39, 159, 22, 132, 161, 58, 13, 113, 109, 23, 33, 127, 76, 158, 168, 95, 241, 164, 39, 149, 115, 28, 163, 197, 93, 58, 77, 123, 234]
对纯数字的key爆一下就行
from z3 import *
from ctypes import *
#input = [BitVec("input[%d]"%i,32) for i in range(40)]
# print('1'*32)
#DASCTF{22222222222222222222222222222222}
enc1=[7, 35, 16, 93, 92, 18, 33, 125, 205, 195, 96, 31, 94, 203, 84, 218, 156, 206, 194, 39, 159, 22, 132, 161, 58, 13, 113, 109, 23, 33, 127, 76, 158, 168, 95, 241, 164, 39, 149, 115, 28, 163, 197, 93, 58, 77, 123, 234]
from pyDes import des, CBC, PAD_PKCS5,ECB
import binascii
KEY='reftqRrg'
def des_encrypt(s):
"""
DES 加密
:param s: 原始字符串
:return: 加密后字符串，16进制
"""
DES_KEY = 'reftqRrg'
des_obj = des(DES_KEY, ECB, DES_KEY, padmode=PAD_PKCS5)
# 返回为字节
secret_bytes = des_obj.encrypt(s, padmode=PAD_PKCS5)
# 返回为16进制
return binascii.b2a_hex(secret_bytes)
def des_descrypt(s,key):
DES_KEY = key
des_obj = des(DES_KEY, ECB, DES_KEY, padmode=PAD_PKCS5)
decrypt_str = des_obj.decrypt(binascii.a2b_hex(s), padmode=PAD_PKCS5)
return decrypt_str
s= "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+/"
# s = "vwxrstuopq34567ABCDEFGHIJyz012PQRSTKLMNOZabcdUVWXYefghijklmn89+/"
def base64_encode(text):
table = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+/"
encoded_text = ""
while text:
# 取出前3个字符
chunk = text[:3]
text = text[3:]
# 将字符转换为ASCII码
chunk_ascii = [ord(c) for c in chunk]
# 将ASCII码转换为二进制字符串
binary_string = ""
for ascii_value in chunk_ascii:
binary_string += format(ascii_value, '08b')
# 将二进制字符串按6位分组
groups = [binary_string[i:i+6] for i in range(0, len(binary_string), 6)]
# 在每个分组前面补0，使其长度为6
for i in range(len(groups)):
groups[i] = groups[i].ljust(6, '0')
# 将每个分组转换为对应的索引值
indices = [int(group, 2) for group in groups]
# 根据索引值从表中取出对应的字符
encoded_chunk = "".join([table[index] for index in indices])
# 在编码后的文本末尾补上'='，使其长度为4的倍数
if len(chunk) < 3:
encoded_chunk += '=' * (3 - len(chunk))
encoded_text += encoded_chunk
return encoded_text
s11='F0DA2F4198C498D2AE317128FD4B8650AE317128FD4B8650AE317128FD4B865080B5D09B7BE31E49EF05367A4E399804'
s12='2367D40D3CE415C000E1A738ED18761F00E1A738ED18761F00E1A738ED18761F84832586424D694AEF05367A4E399804'
enc='0723105D5C12217DCDC3601F5ECB54DA9CCEC2279F1684A13A0D716D17217F4C9EA85FF1A42795731CA3C55D3A4D7BEA'
s1='DASCTF{22222222222222222222222222222222}'
# print(des_descrypt(enc))
import base64
import string
table=string.digits
import itertools
for i in itertools.product(table,repeat=6):
key=''
for x in i:
key+=x
msg=base64_encode(key)
s=des_descrypt(enc,msg)
if b'DASCTF' in s:
print(key)
print(s)
Blast
加了点不透明谓词，动调发现就是对字符的2次md5
enc=[ 0x31, 0x34, 0x64, 0x38, 0x39, 0x63, 0x33, 0x38, 0x63, 0x64,
0x30, 0x66, 0x62, 0x32, 0x33, 0x61, 0x31, 0x34, 0x62, 0x65,
0x32, 0x37, 0x39, 0x38, 0x64, 0x34, 0x34, 0x39, 0x63, 0x31,
0x38, 0x32, 0x00, 0x61, 0x39, 0x34, 0x38, 0x33, 0x37, 0x62,
0x31, 0x38, 0x66, 0x38, 0x66, 0x34, 0x33, 0x66, 0x32, 0x39,
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0x34, 0x61, 0x31, 0x34, 0x39, 0x31, 0x65, 0x37, 0x36, 0x39,
0x64, 0x66, 0x36, 0x66, 0x34, 0x63, 0x33, 0x62, 0x34, 0x31,
0x39, 0x00, 0x37, 0x31, 0x62, 0x30, 0x34, 0x33, 0x38, 0x62,
0x66, 0x34, 0x36, 0x61, 0x61, 0x32, 0x36, 0x39, 0x32, 0x38,
0x63, 0x37, 0x66, 0x35, 0x61, 0x33, 0x37, 0x31, 0x64, 0x36,
0x31, 0x39, 0x65, 0x31, 0x00, 0x61, 0x66, 0x38, 0x35, 0x64,
0x35, 0x31, 0x32, 0x35, 0x39, 0x34, 0x66, 0x63, 0x38, 0x34,
0x61, 0x35, 0x63, 0x36, 0x35, 0x65, 0x63, 0x39, 0x39, 0x37,
0x30, 0x39, 0x35, 0x36, 0x65, 0x61, 0x35, 0x00, 0x33, 0x39,
0x61, 0x62, 0x65, 0x34, 0x62, 0x63, 0x61, 0x39, 0x30, 0x34,
0x62, 0x63, 0x61, 0x35, 0x61, 0x31, 0x31, 0x31, 0x32, 0x31,
0x39, 0x35, 0x35, 0x61, 0x32, 0x39, 0x39, 0x36, 0x62, 0x66,
0x00]
enc1=[]
for i in range(0,len(enc),33):
enc1.append(bytes(enc[i:i+32]).decode())
import string
table=string.digits+string.ascii_letters+'=-/_{}*+()'
z=''
import hashlib
for j in enc1:
flag=1
for i in table:
x=i.encode()
result = hashlib.md5(x)
result=hashlib.md5(result.hexdigest().encode())
if result.hexdigest()==j:
z+=i
flag=0
if flag==1:
print(j)
print(z)
CSGO
换表base64，init有反调试，nop就好
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