encrypting lines from file with md5 module doesn't work?

Nick Craig-Wood nick at craig-wood.com
Sat Feb 14 17:32:00 CET 2009


Canned <user at domain.invalid> wrote:
>  I write a small script that read lines from plain text file and encrypt
>  each lines using md5 module. I have a small word list that contain 2000+
>  words, 1 word/line. Using the code below, I can save the output to
>  another file to use it with john the ripper (http://www.openwall.com).
> 
>  Here is the part that annoys me, john recognize the output as des and
>  not as md5. Using the original wordlist, I tried to crack the list but
>  nothing has come up after waiting for almost 9 hours. Can someone please
>  tell me what did I wrong? Why john don't recognize the output as md5?
>  I'm using python 2.5.1 and I'm python noob and also don't have any
>  knowledge about encryption.
> 
>  import sys, md5
> 
>  f = open(sys.argv[1])
>  obj = md5.new()
> 
>  for line in f:
>          if line[-1:] == '\n':
>                  text = line[:-1]
>          obj.update(text),
>          print text + ':' + obj.hexdigest()
> 
>  f.close()
> 
> 
>  000000:670b14728ad9902aecba32e22fa4f6bd
>  00000000:c47532bbb1e2883c902071591ae1ec9b
>  111111:bf874003f752e86e6d6ba6d6df1f24a2
>  11111111:65a89de3000110bf37bcafdbd33df55a
>  121212:38a8eeb4dfb0f86aefea908365817c15
>  123123:f226a65a908909b83aed92661897d0c9

john cracks password files if I remember rightly.

md5 encoded password files don't look like that, they look like this

guest:$1$3nvOlOaw$vRWaitT8Ne4sMjf9NOrVZ.:13071:0:99999:7:::

(not a real password line!)

You need to work out how to write that format.

>From memory: the "$1" bit means it is an md5 hash, the next
"$3nvOlOaw$" is the salt and the final "$vRWaitT8Ne4sMjf9NOrVZ." is
the md5 hash in some encoded format or other!  Some googling should
reveal the correct algorithm!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick



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