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serpentine.py
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import random
import sys
def str_xor(secret, key):
#extend key to secret length
new_key = key
i = 0
while len(new_key) < len(secret):
new_key = new_key + key[i]
i = (i + 1) % len(key)
return "".join([chr(ord(secret_c) ^ ord(new_key_c)) for (secret_c,new_key_c) in zip(secret,new_key)])
flag_enc = chr(0x15) + chr(0x07) + chr(0x08) + chr(0x06) + chr(0x27) + chr(0x21) + chr(0x23) + chr(0x15) + chr(0x5c) + chr(0x01) + chr(0x57) + chr(0x2a) + chr(0x17) + chr(0x5e) + chr(0x5f) + chr(0x0d) + chr(0x3b) + chr(0x19) + chr(0x56) + chr(0x5b) + chr(0x5e) + chr(0x36) + chr(0x53) + chr(0x07) + chr(0x51) + chr(0x18) + chr(0x58) + chr(0x05) + chr(0x57) + chr(0x11) + chr(0x3a) + chr(0x0f) + chr(0x0a) + chr(0x5b) + chr(0x57) + chr(0x41) + chr(0x55) + chr(0x0c) + chr(0x59) + chr(0x14)
def print_flag():
flag = str_xor(flag_enc, 'enkidu')
print(flag)
def print_encouragement():
encouragements = ['You can do it!', 'Keep it up!',
'Look how far you\'ve come!']
choice = random.choice(range(0, len(encouragements)))
print('\n-----------------------------------------------------')
print(encouragements[choice])
print('-----------------------------------------------------\n\n')
def main():
print_flag()
# print(
# '''
# Y
# .-^-.
# / \ .- ~ ~ -.
# () () / _ _ `. _ _ _
# \_ _/ / / \ \ . ~ _ _ ~ .
# | | / / \ \ .' .~ ~-. `.
# | | / / ) ) / / `.`.
# \ \_ _/ / / / / / `'
# \_ _ _.' / / ( (
# / / \ \\
# / / \ \\
# / / ) )
# ( ( / /
# `. `. .' /
# `. ~ - - - - ~ .'
# ~ . _ _ _ _ . ~
# '''
# )
# print('Welcome to the serpentine encourager!\n\n')
# while True:
# print('a) Print encouragement')
# print('b) Print flag')
# print('c) Quit\n')
# choice = input('What would you like to do? (a/b/c) ')
# if choice == 'a':
# print_encouragement()
# elif choice == 'b':
# print('\nOops! I must have misplaced the print_flag function! Check my source code!\n\n')
# elif choice == 'c':
# sys.exit(0)
# else:
# print('\nI did not understand "' + choice + '", input only "a", "b" or "c"\n\n')
if __name__ == "__main__":
main()