got the flag

hashcash.py

@@ -15,7 +15,6 @@ rand_chars = ([chr(x) for x in range(ord('a'), ord('z'))] +
               [chr(x) for x in range(ord('0'), ord('9'))] +
               ['+', '-', '/'])
 
-
 char_map = {'0': '0000',
             '1': '0001',
             '2': '0010',
@@ -33,7 +32,6 @@ char_map = {'0' : '0000',
             'e': '1110',
             'f': '1111'}
 
-
 rc_len = len(rand_chars)
 
 min_bits = 0
@@ -41,9 +39,11 @@ min_bits = 0
 max_bits = 160
 default_bits = 15
 
+
 def is_valid(stamp: str) -> bool:
     return validate(int(stamp.split(':')[1]), stamp)
 
+
 def validate(nbits: int, stamp: str, encoding: str = 'utf-8') -> bool:
     if nbits < min_bits or nbits > max_bits:
         raise ValueError("Param 'nbits' must be in range [0, 160), but is {}".format(nbits))
@@ -63,6 +63,7 @@ def validate(nbits : int, stamp : str, encoding : str ='utf-8') -> bool:
 
     return total == 0
 
+
 def generate(nbits: int, resource: str, encoding: str = 'utf-8') -> str:
     # ver:bits:date:resource:[ext]:rand:counter
     ver = 1
@@ -74,7 +75,6 @@ def generate(nbits : int, resource : str, encoding : str ='utf-8') -> str:
 
     result = None
     while result is None:
-        #stamp = ":".join(str(elem) for elem in [ver, bits, date_str, resource, ext, rand, counter])
         stamp = "{}{}".format(resource, counter)
 
         if validate(nbits, stamp, encoding=encoding):
@@ -84,22 +84,3 @@ def generate(nbits : int, resource : str, encoding : str ='utf-8') -> str:
         counter += 1
 
     return result
-
-
-if __name__ == "__main__":
-
-    from argparse import ArgumentParser
-    parser = ArgumentParser()
-
-    parser.add_argument("NBITS", type=int, default=default_bits, help="Number of leading zeroes in a stamp", choices=range(max_bits+1))
-    parser.add_argument("RESOURCE", help="The resource string to use in the stamp. Ex: email address, ip address, etc")
-    parser.add_argument('-v', '--validate', action='store_true', help="Validate RESOURCE as a HashCash stamp")
-
-    args = parser.parse_args()
-
-    func = generate
-
-    if args.validate:
-        func = validate
-
-    print(func(args.NBITS, args.RESOURCE))

netsec.py

@@ -6,6 +6,7 @@ import socket
 import hashlib
 import requests
 import sympy
+import hashcash
 """
 requirements:
     sympy
@@ -54,6 +55,11 @@ def sha1_magic(s, last_solution):
     print(digest)
     s.send(digest.encode())
     print(s.recv(1024).decode())
+    newstring = hashcash.generate(16, 'Y8O353{}'.format(last_solution))
+    print(s.recv(1024).decode())
+    print(newstring)
+    s.send(newstring.encode())
+    print(s.recv(1024).decode())
 
 
 def http_comm():
@@ -69,7 +75,7 @@ def http_comm():
 def https_comm():
     sess = requests.Session()
     url = "https://152.66.249.144/"
-    flag = sess.get(url, cert=("/tmp/clientcert.pem", "/tmp/clientkey.pem"), verify=False)
+    flag = sess.get(url, cert=("/tmp/clientcert.pem", "/tmp/clientkey.pem"), verify=False, headers={'User-Agent': 'CrySyS'})
     print(flag.content)
 
 
@@ -99,4 +105,6 @@ if __name__ == '__main__':
     knock()
     server_communicate()
     http_comm()
-    #https_comm()
+    https_comm()
+
+# FLAG: YouCanHandleNetworking-Y8O353-1d66de