# 在源代码上加一个函数
def get_ans():
    ans=""
    for c in enc:
        c+=3
        c^=0xCC
        ans+=chr(c)
    return ans
if __name__ == "__main__":
    print(get_ans())

# 将字符串转换成整数
def str_to_ints(s):
    return [int.from_bytes(s[i:i+4].encode(), byteorder='little') for i in range(0, len(s), 4)]

# 将整数转换回字符串
def ints_to_str(ints):
    return ''.join([int.to_bytes(i, length=4, byteorder='little').decode() for i in ints])

def encrypt(v, k):
    v0 = c_uint32(v[0])
    v1 = c_uint32(v[1])
    sum_val = c_uint32(0)
    delta = c_uint32(289739793)
    (k0, k1, k2, k3) = (c_uint32(k[0]), c_uint32(k[1]), c_uint32(k[2]), c_uint32(k[3]))
    for _ in range(32):
        sum_val.value += delta.value
        v0.value += (v1.value << 4) + k0.value ^ v1.value + sum_val.value ^ (v1.value >> 5) + k1.value
        v1.value += (v0.value << 4) + k2.value ^ v0.value + sum_val.value ^ (v0.value >> 5) + k3.value
    return [
        v0.value,
        v1.value]

def changeint(value):
    if value < 0 or value > 4294967295:
        raise ValueError("Input must be a 32-bit unsigned integer (0-4294967295).")
    if value < 2147483648:
        return value
    else:
        return value - 4294967296

def changechar(value):
    if value < 0 or value > 255:
        raise ValueError("Input must be an 8-bit unsigned integer (0-255).")
    if value < 128:
        return value
    else:
        return value - 256

if __name__ == "__main__":
    f = open("Problem.bin", "rb")
    data = f.read()
    f.close()
    cnt = 0
    fg = 0
    l = []
    offset = []
    for c in data:
        l.append(c)
    for i in range(len(l)-2):
        if l[i]==0x0f and l[i+1]==0xb6 and (l[i+2]==0x85 or l[i+2]==0x45):
            if l[i+2]==0x45:    # 单字节偏移
                offset.append(abs(changechar(l[i+3])))
            else:   # 四字节偏移，注意是LE模式
                tmp=[l[i+6],l[i+5],l[i+4],l[i+3]]
                ans=0
                for x in tmp:
                    ans<<=8
                    ans|=x
                offset.append(abs(changeint(ans)))
    # f=open("out.txt","w")
    # print(offset,file=f)
    # f.close()
    print(max(offset),min(offset))
    print(len(offset))
    print(offset)

def changeint(value):
    if value < 0 or value > 4294967295:
        raise ValueError("Input must be a 32-bit unsigned integer (0-4294967295).")
    if value < 2147483648:
        return value
    else:
        return value - 4294967296

def changechar(value):
    if value < 0 or value > 255:
        raise ValueError("Input must be an 8-bit unsigned integer (0-255).")
    if value < 128:
        return value
    else:
        return value - 256

if __name__ == "__main__":
    f = open("Problem.bin", "rb")
    data = f.read()
    f.close()
    cnt = 0
    fg = 0
    l = []
    offset = []
    for c in data:
        l.append(c)
    for i in range(len(l)-2):
        if l[i]==0x0f and l[i+1]==0xb6 and (l[i+2]==0x85 or l[i+2]==0x45):
            if l[i+2]==0x45:
                offset.append(abs(changechar(l[i+3])))
            else:
                tmp=[l[i+6],l[i+5],l[i+4],l[i+3]]
                ans=0
                for x in tmp:
                    ans<<=8
                    ans|=x
                offset.append(abs(changeint(ans)))
    # f=open("out.txt","w")
    # print(offset,file=f)
    # f.close()
    print(max(offset),min(offset))
    print(len(offset))


def reversebytes(input_file, output_file):
    with open(input_file, 'rb') as f:
        content = f.read()
    reversed_content = content[::-1]
    with open(output_file, 'wb') as f:
        f.write(reversed_content)

if __name__ == "__main__":
    reversebytes("flag.png","out.png")

# if __name__ == "__main__":
#     for i in range(0,322):
#         print(f"extern \"C\" int f{i}(int a,int b);")

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
while True:
    data = input()
    if data == "quit":
        break
    s.sendto(data.encode(),("202.199.6.66" ,35366))
    print(s.recv(1024).decode())

import socket

def udp_client():
    client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    local_address = ('0.0.0.0', 60000)
    client_socket.bind(local_address)
    try:
        print('Waiting for response...')
        data, server = client_socket.recvfrom(4096)
        print(f'Received: {data.decode()}')
        data, server = client_socket.recvfrom(4096)
        print(f'Received: {data.decode()}')
    finally:
        print('Closing socket')
        client_socket.close()


if __name__ == '__main__':
    udp_client()

import re

def step2(matches):
    binary_string = ''
    for whitespace_sequence in matches:
        count = len(whitespace_sequence)
        binary_string += '0' if count % 2 == 0 else '1'
    return binary_string

def step3(binary_string):
    hex_string = ''
    binary_length = len(binary_string)
    for i in range(0, binary_length, 4):
        chunk = binary_string[i:i + 4]
        if len(chunk) < 4:
            chunk = chunk.ljust(4, '0')
        hex_digit = hex(int(chunk, 2))[2:]
        hex_string += hex_digit
    decoded_string = ''
    for i in range(0, len(hex_string), 2):
        hex_byte = hex_string[i:i + 2]
        if len(hex_byte) == 2:
            decoded_string += chr(int(hex_byte, 16))

    return decoded_string

php = open(r'index.php', 'r')
content = php.read()
php.close()

res = re.findall(r'[   \t]+', content)
print(res)
bin_str = step2(res)
print(bin_str)
hex_str = step3(bin_str)
print(hex_str)

if (a[1] * 33 + a[2] + a[3] * 255 + a[4] * 5 - a[5] * 44) + a[6] * 23 + a[7] + a[8] - a[0] == 18086 and a[1] * 123121 + a[2] * 456 + l * 4421 + a[4] * 789 + a[6] * 111 + l * 222 == 10718690 and a[3] * 114514 + a[5] * 1919810 + l * 233 + a[7] * 23333 + a[0] * 66666 == 142285032 and a[1] * 2 + a[2] * 223 + l * 4 + a[4] * 2123 + a[6] * 212 + l * 22 - a[8] == 179865 and (a[1] * 3 + a[2] * 3 + a[0] * 3 + l * 3 - a[8] * 3) + a[7] * 2 == 1996 and ((((a[1] - a[2]) + a[3] - a[4]) + a[5] + a[6] * 89 + a[7] - a[8]) + a[0] * 89 - l) * 22 == 247258 and ((a[1] + 90 * a[2] - a[3]) + a[4] * a[5] * a[6] + a[7] + a[8] + 90 * a[0]) * 245 + l * 2 == 72365152 and (a[1] + a[5] + a[6] + a[7] + a[8] + a[0]) * 35 + l * 3 == 15563 and a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4 + l == 0x181C4785E36ACE6 and ((a[1] + a[2] * 345 - a[3]) + a[4] * 24 + a[5] * 856 - a[6] - a[7]) + a[8] * 1212 + a[0] + l * 33 == 182318:

l = 0x181C4785E36ACE6-(a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4)

a = [ord('B'), ord('C'), ord('B'), ord('C'), ord('E'), ord('C'), ord('E'), ord('D'), ord('B')]
alp = ['A','B','C','D','E']

# l = 0x181C4785E36ACE6-(a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4)
# if (a[1] * 33 + a[2] + a[3] * 255 + a[4] * 5 - a[5] * 44) + a[6] * 23 + a[7] + a[8] - a[0] == 18086 and a[1] * 123121 + a[2] * 456 + l * 4421 + a[4] * 789 + a[6] * 111 + l * 222 == 10718690 and a[3] * 114514 + a[5] * 1919810 + l * 233 + a[7] * 23333 + a[0] * 66666 == 142285032 and a[1] * 2 + a[2] * 223 + l * 4 + a[4] * 2123 + a[6] * 212 + l * 22 - a[8] == 179865 and (a[1] * 3 + a[2] * 3 + a[0] * 3 + l * 3 - a[8] * 3) + a[7] * 2 == 1996 and ((((a[1] - a[2]) + a[3] - a[4]) + a[5] + a[6] * 89 + a[7] - a[8]) + a[0] * 89 - l) * 22 == 247258 and ((a[1] + 90 * a[2] - a[3]) + a[4] * a[5] * a[6] + a[7] + a[8] + 90 * a[0]) * 245 + l * 2 == 72365152 and (a[1] + a[5] + a[6] + a[7] + a[8] + a[0]) * 35 + l * 3 == 15563 and a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4 + l == 0x181C4785E36ACE6 and ((a[1] + a[2] * 345 - a[3]) + a[4] * 24 + a[5] * 856 - a[6] - a[7]) + a[8] * 1212 + a[0] + l * 33 == 182318:
#     print("Yes")

def check(b):
    a = []
    for i in b:
        a.append(ord(i))
    l = 0x181C4785E36ACE6-(a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4)
    if (a[1] * 33 + a[2] + a[3] * 255 + a[4] * 5 - a[5] * 44) + a[6] * 23 + a[7] + a[8] - a[0] == 18086 and a[1] * 123121 + a[2] * 456 + l * 4421 + a[4] * 789 + a[6] * 111 + l * 222 == 10718690 and a[3] * 114514 + a[5] * 1919810 + l * 233 + a[7] * 23333 + a[0] * 66666 == 142285032 and a[1] * 2 + a[2] * 223 + l * 4 + a[4] * 2123 + a[6] * 212 + l * 22 - a[8] == 179865 and (a[1] * 3 + a[2] * 3 + a[0] * 3 + l * 3 - a[8] * 3) + a[7] * 2 == 1996 and ((((a[1] - a[2]) + a[3] - a[4]) + a[5] + a[6] * 89 + a[7] - a[8]) + a[0] * 89 - l) * 22 == 247258 and ((a[1] + 90 * a[2] - a[3]) + a[4] * a[5] * a[6] + a[7] + a[8] + 90 * a[0]) * 245 + l * 2 == 72365152 and (a[1] + a[5] + a[6] + a[7] + a[8] + a[0]) * 35 + l * 3 == 15563 and a[1] * a[2] * a[3] * a[4] * a[5] * a[6] * a[7] * a[8] * a[0] * 4 + l == 0x181C4785E36ACE6 and ((a[1] + a[2] * 345 - a[3]) + a[4] * 24 + a[5] * 856 - a[6] - a[7]) + a[8] * 1212 + a[0] + l * 33 == 182318:
        print(l)
        return True
    return False

for y in alp:
    for b in alp:
        for c in alp:
            for d in alp:
                for e in alp:
                    for f in alp:
                        for g in alp:
                            for h in alp:
                                for i in alp:
                                    a = [y,b,c,d,e,f,g,h,i]
                                    if check(a):
                                        print(a)