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import binascii  
#from backports.pbkdf2 import pbkdf2_hmac  
import hashlib
  
pbkdf2salt = binascii.unhexlify('b876b03e431c10f21ae1752539e10ed3')  
rounds = 10  
  
def hash(bin):  
    encoded = bin.encode("utf8")  
  
    key = hashlib.pbkdf2_hmac("sha1", encoded, pbkdf2salt, rounds, 32)  
    return binascii.hexlify(key)  
  

cipertext_hashed_guess = b"ea2a1ee58b5695d7e9ee8a06900d19eadc442f218b457db81541622b2371ac4a"  
print(f"Searching for {cipertext_hashed_guess}")  
  
  
for i in range(0, 10000000):  
    payload = str(i).rjust(7, '0')  
    plaintext_guess = "PWNX{00000000000000000000" + payload + "111}"  
  
    hashed_guess = hash(plaintext_guess)  
  
    #print(plaintext_guess + '\r')  
  
    if hashed_guess == cipertext_hashed_guess:  
        print(f"\nFlag found! hash({plaintext_guess}) -> {hashed_guess}")  
        break