This Python code is not working, it keeps going to print("Preimage not found")

Can you help with fixing the issue?

Thank you,

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import hashlib import time

def find_preimage(): target_hash = "bh2k2" chars = "abcdefghijklmnopqrstuvwxyz0123456789" for i in chars: for j in chars: for k in chars: for l in chars: for m in chars: message = i + j + k + l + m print("message: "+message) hash_value = hashlib.sha1(message.encode()).hexdigest()[:10] if hash_value == target_hash: return message return None

start_time = time.time() preimage = find_preimage() end_time = time.time()

if preimage: print("Preimage found: " + preimage) print("Time taken: " + str(end_time - start_time) + " seconds") else: print("Preimage not found")