Home/ Questions/Ways to resolve the error - typeerror: unicode-objects must be encoded before hashing
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Veda White
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Asked: 2022-05-12T08:00:13+00:00 In:

Ways to resolve the error – typeerror: unicode-objects must be encoded before hashing

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I am new to programs and searching the “typeerror: unicode-objects must be encoded before hashing” to understand it better. It seems it doesn’t work as expected when I used some suggestions before. This is the command line I use:

import hashlib, sys
 m = hashlib.md5()
 hash = ""
 hash_file = input("What is the file name in which the hash resides? ")
 wordlist = input("What is your wordlist? (Enter the file name) ")
 try:
  hashdocument = open(hash_file, "r")
 except IOError:
  print("Invalid file.")
  raw_input()
  sys.exit()
 else:
  hash = hashdocument.readline()
  hash = hash.replace("\n", "")
 
 try:
  wordlistfile = open(wordlist, "r")
 except IOError:
  print("Invalid file.")
  raw_input()
  sys.exit()
 else:
  pass
 for line in wordlistfile:
  # Flush the buffer (this caused a massive problem when placed 
  # at the beginning of the script, because the buffer kept getting
  # overwritten, thus comparing incorrect hashes)
  m = hashlib.md5()
  line = line.replace("\n", "")
  m.update(line)
  word_hash = m.hexdigest()
  if word_hash == hash:
  print("Collision! The word corresponding to the given hash is", line)
  input()
  sys.exit()
 
 print("The hash given does not correspond to any supplied word in the wordlist.")
 input()
 sys.exit()

The error I’m getting is below:

Traceback (most recent call last):
  File "python_md5_cracker.py", line 27, in <module>
  m.update(line)
 TypeError: Unicode-objects must be encoded before hashing

Please give me the solution for this issue.

unicode-objects
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2 Answers

  1. Best Answer
    Expert

    The cause: You can only use bytes, not Python strings (what used to be unicode in Python < 3). In your wordlist file the bytes  are being automatically decoded to Unicode by Python 3 as you read from the file.

    Solution: The strings must be encoded with your preferred encoding: utf-32, utf-16, utf-8 or even one of the restricted 8-bit encodings. Here is my suggestion:

    m.update(line.encode(wordlistfile.encoding))

    • 19

  2. It is necessary to define encoding format and utf-8.

    This example generates a random number by using the SHA256 algorithm. 

    >>> import hashlib
>>> hashlib.sha256(str(random.getrandbits(256)).encode('utf-8')).hexdigest()
'cd183a211ed2434eac4f31b317c573c50e6c24e3a28b82ddcb0bf8bedf387a9f'
    • 5

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