Flare on challenge 6

ch6.py

import collections
import string
import sys

def hextobin(string):
  bin_str=''
  split_str=list(string)

  for i in split_str:
    temp1=str(bin(int(i,16))[2:].zfill(4))
    bin_str+=temp1

  return bin_str

flag=''
#Character 1 - Handling rotation rightwards for the first time
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('f2', 16))

    for x in c1:
        l.append(x)

    if hex(int(''.join(l), 2))[2:] == '1b':
        flag+=i
        break

#Character 2 - Handling XOR for the first time
for i in string.printable:
    t1=''
    t1= ord(i)^0x40
    t1= t1^0xf2
    t1= t1^0xb3 

    if t1 == 0x30:
        flag+=i
        break

#Character 3
for i in string.printable:
    t1=''
    t1= ord(i)^0x71

    if t1 == 0x1f:
        flag+=i
        break

#Character 4 - Handling hex addition and ignoring the carry for the first time
for i in string.printable:
    l=[]
    t2=ord(i)+0xa3
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('bc', 16))
    for x in c1:
        l.append(x)

    if hex(int(''.join(l), 2))[2:] == 'b0':
        flag+=i
        break

#Character 5 - Handling hex subtraction with negative numbers for the first time
for i in string.printable:
    t2=ord(i)-0x79
    """
    https://stackoverflow.com/questions/7822956/how-to-convert-negative-integer-value-to-hex-in-python
    """
    t2= hex(t2 & (2**8-1))[-2:]

    if t2 == 'e8':
        flag+=i
        break

#Character 6
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('82', 16))

    for x in c1:
        l.append(x)

    t1= ''.join(l)
    t2= int(t1, 2)-0x28
    t2= hex(t2 & (2**8-1))[-2:]

    if t2 == 'f6':
        flag+=i
        break

#Character 7
for i in string.printable:
    l=[]
    t2=ord(i)-0xb0
    """
    https://stackoverflow.com/questions/7822956/how-to-convert-negative-integer-value-to-hex-in-python
    """
    t2= hex(t2 & (2**8-1))[-2:]
    x = list(hextobin(t2))
    c1= collections.deque(x)
    c1.rotate(int('4d', 16))
    for x in c1:
        l.append(x)
    t1= ''.join(l)
    t2= int(t1, 2)+0x2c
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    if hex(t1)[2:].zfill(2) == '1f':
        flag+=i
        break

#Character 8 - Rotate left for the first time. This I think is the last new operation (Phew #-o)  and it's just code reuse from now on :).
for i in string.printable:
    l=[]
    t2=ord(i)+0x54
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('-0x99', 16))
    for x in c1:
        l.append(x)

    t2= int(''.join(l), 2)^0xb8
    l=[]
    x = list(hextobin(hex(t2)[2:]))
    c1= collections.deque(x)
    c1.rotate(int('2a', 16))
    for x in c1:
        l.append(x)
    t2= int(''.join(l), 2) + 0x3f
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    if hex(t1)[2:].zfill(2) == 'af':
        flag+=i
        break

#Character 9
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('ba', 16))

    for x in c1:
        l.append(x)

    if hex(int(''.join(l), 2))[2:] == '5d':
        flag+=i
        break
    
#Character 10
for i in string.printable:
    l=[]
    t1=''
    t1= ord(i)^0xed
    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('6c', 16))

    for x in c1:
        l.append(x)

    t1= int(''.join(l), 2)
    t2=t1+0x30
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    if t1 == 0x29:
        flag+=i
        break

#Character 11
for i in string.printable:
    t2=ord(i)-0xbf
    t2= hex(t2 & (2**8-1))[-2:]

    if t2 == 'b5':
        flag+=i
        break

#Character 12
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('-bc', 16))

    for x in c1:
        l.append(x)

    t1= int(''.join(l), 2)
    t2=t1+0x8c

    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('-0x7b', 16))
    for x in c1:
        l.append(x)

    t1= int(''.join(l), 2)
    t2= t1-0x31
    t2= hex(t2 & (2**8-1))[-2:]
    t2= int(t2, 16)

    t2+= 0x63

    if hex(t2)[2:] == 'a5':
        flag+=i
        break
    
#Character 13
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('-0x20', 16))
    c1.rotate(int('-0x16', 16))

    for x in c1:
        l.append(x)

    t1= int(''.join(l), 2)
    t1= t1^0xae

    l=[]
    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('-0x98', 16))
    for x in c1:
        l.append(x)

    t1= int(''.join(l), 2)
    if hex(t1)[2:] == 'f3':
        flag+=i
        break

#Character 14
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('6e', 16))

    for x in c1:
        l.append(x)

    t2= int(''.join(l), 2)
    t2= t2+0xd2
    t2= hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)

    if hex(t1)[2:] == 'a6':
        flag+=i
        break

#Character 14
for i in string.printable:
    l=[]
    t2=ord(i)+0x34
    t2=hex(t2)
    if len(str(t2)) == 4:
        t1= int(str(t2)[2:], 16)
    elif len(str(t2)) == 5:
        t1= int(str(t2)[3:], 16)
    
    if hex(t1)[2:] == '62':
        flag+=i
        break

#Character 15
for i in string.printable:
    l=[]
    t2=ord(i)+0xcd

    t2= t2-0x10
    t2= hex(t2 & (2**8-1))
    t2= int(t2, 16)

    t2+= 0x62

    t2^= 0xb2
    if hex(t2)[2:] == '32':
        flag+=i
        break
    
#Character 16
for i in string.printable:
    l=[]
    t1=''
    t1= ord(i)^0xb7
    t1= t1^0x73
    x= list(bin(t1)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('0x7', 16))

    for x in c1:
        l.append(x)

    t2= int(''.join(l), 2)
    if hex(t2)[2:] == 'eb':
        flag+=i
        break

#Character 17
for i in string.printable:
    l=[]
    t2=ord(i)+0x34
    t2=t2-0x61
    t2= hex(t2 & (2**8-1))
    t2= int(t2,16)

    x= list(bin(t2)[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('0x36', 16))

    for x in c1:
        l.append(x)

    t2= int(''.join(l), 2)
    t2= t2+0x5b
    t2= t2-0x4c
    t2= hex(t2 & (2**8-1))[2:].zfill(2)

    if t2 == '0b':
        flag+=i
        break

#Character 18
for i in string.printable:
    l=[]
    t2=ord(i)+0x5a

    if hex(t2)[2:] == '9a':
        flag+=i
        break

#Character 19
for i in string.printable:
    l=[]
    x= list(bin(ord(i))[2:].zfill(8))
    c1= collections.deque(x)
    c1.rotate(int('a2', 16))

    for x in c1:
        l.append(x)

    if hex(int(''.join(l), 2))[2:] == '99':
        flag+=i
        break

#Character 20
"""
At this point I just guessed the rest as it was similar to the previous challenges. Wasted another half hour due to an oversight and ended up looking at previous solutions. I'd accidentally resolved a character twice and added an extra 'l' #-o 
"""
print flag