Decrypting Epsilon Note encoded notes with python - updated for aes256 and python3 (first do: pip install pycrypto)

decrypt_en_new.py

#!/usr/bin/python

######################################################################
#  Decrypt an Epsilon Note encoded file given the password.
#
#  This file is in the public domain.
#
#  original file by Dov Grobgeld <[email protected]> 2017-02-17 
#
#  adapted to python3 and aes256 by [email protected] 2019-12-17
#  first do:
#  pip install pycrypto
#
######################################################################

import sys,io,base64,hashlib
from Crypto.Cipher import AES

def unpad(s):
  return s[0:-ord(s[-1:])]

def filetob64(handle):
  b64 = ''
  within = False
  for line in handle:
    if '~~~~~~~~~~' in line:
      within = not within
      continue
    if within:
      b64 += line[:-1]
  return b64

def en_decrypt(handle, password):
  raw = base64.b64decode(filetob64(handle))
  enc_text,iv = raw[:-16],raw[-16:]
  key = hashlib.sha256(password.encode('utf-8')).digest()
  aes = AES.new(key, AES.MODE_CBC, iv)
  return unpad(aes.decrypt(enc_text))

if len(sys.argv) > 1:
  handle = open(sys.argv[1])
  password = sys.argv[2]
else:
  # test below
  encrypted_text = '''
~~~~~~~~~~encrypted
hT0pu7ME4NA6L2XQmmsksgiEQaga7sYXzHDJRWMx1NWiKO1IO0OCkhLl5K/LozwvoC35hYJv8SqJLoAizOlD1imq8zxLZI5O3ww+ySYk2SA=
~~~~~~~~~~
'''
  password = 'password'
  handle = io.StringIO(encrypted_text)

print(en_decrypt(handle, password))

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