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# Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "AES tools" project.
# For details, see https://github.com/egor-tensin/aes-tools.
# Distributed under the MIT License.
from collections.abc import Iterable
from enum import Enum
import logging
import os.path
import subprocess
class Algorithm(Enum):
@staticmethod
def parse(s):
return Algorithm(s.lower())
@staticmethod
def try_parse(s):
try:
return Algorithm.parse(s)
except ValueError:
return None
AES128, AES192, AES256 = 'aes128', 'aes192', 'aes256'
def __str__(self):
return self.value
class Mode(Enum):
@staticmethod
def parse(s):
s = s.lower()
if '{}128'.format(Mode.CFB) == s:
return Mode.CFB
return Mode(s)
@staticmethod
def try_parse(s):
try:
return Mode.parse(s)
except ValueError:
return None
ECB, CBC, CFB, OFB, CTR = 'ecb', 'cbc', 'cfb', 'ofb', 'ctr'
def requires_init_vector(self):
return self != Mode.ECB
def __str__(self):
return self.value
class BlockInput:
def __init__(self, key, plaintexts, iv=None):
self.key = key
self.plaintexts = plaintexts
self.iv = iv
def to_args(self):
args = [self.key]
if self.iv is not None:
args.append(self.iv)
args.extend(self.plaintexts)
return args
class Tools:
def __init__(self, search_dirs, use_sde=False):
if search_dirs:
if isinstance(search_dirs, str):
os.environ['PATH'] += os.pathsep + search_dirs
elif isinstance(search_dirs, Iterable):
os.environ['PATH'] += os.pathsep + os.pathsep.join(search_dirs)
else:
os.environ['PATH'] += os.pathsep + str(search_dirs)
self._use_sde = use_sde
_ENCRYPT_BLOCK = 'encrypt_block'
_DECRYPT_BLOCK = 'decrypt_block'
_ENCRYPT_FILE = 'encrypt_file'
_DECRYPT_FILE = 'decrypt_file'
def run(self, tool_path, args):
cmd_list = ['sde', '--', tool_path] if self._use_sde else [tool_path]
cmd_list.extend(args)
logging.debug('Trying to execute: %s', subprocess.list2cmdline(cmd_list))
try:
output = subprocess.check_output(
cmd_list, universal_newlines=True, stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
logging.error('Output:\n%s', e.output)
raise
logging.debug('Output:\n%s', output)
return output.split()
@staticmethod
def _block_inputs_to_args(inputs):
args = []
while True:
head = next(inputs, None)
if head is None:
break
args.append('--')
args.extend(head.to_args())
return args
@staticmethod
def _block_settings_to_args(algorithm, mode, use_boxes=False):
args = [
'--algorithm', str(algorithm),
'--mode', str(mode),
]
if use_boxes:
args.append('--use-boxes')
return args
@staticmethod
def _build_block_args(algorithm, mode, inputs, use_boxes=False):
args = Tools._block_settings_to_args(algorithm, mode, use_boxes)
if isinstance(inputs, Iterable):
args.extend(Tools._block_inputs_to_args(iter(inputs)))
else:
args.extend(inputs.to_args())
return args
def run_encrypt_block(self, algorithm, mode, inputs, use_boxes=False):
args = self._build_block_args(algorithm, mode, inputs, use_boxes)
return self.run(self._ENCRYPT_BLOCK, args)
def run_decrypt_block(self, algorithm, mode, inputs, use_boxes=False):
args = self._build_block_args(algorithm, mode, inputs, use_boxes)
return self.run(self._DECRYPT_BLOCK, args)
@staticmethod
def _build_file_args(
algorithm, mode, key, input_path, output_path, iv=None):
args = [
'--algorithm', str(algorithm),
'--mode', str(mode),
'--key', key,
'--input', input_path,
'--output', output_path
]
if iv is not None:
args.extend(('--iv', iv))
return args
def run_encrypt_file(
self, algorithm, mode, key, input_path, output_path, iv=None):
args = self._build_file_args(
algorithm, mode, key, input_path, output_path, iv)
return self.run(self._ENCRYPT_FILE, args)
def run_decrypt_file(
self, algorithm, mode, key, input_path, output_path, iv=None):
args = self._build_file_args(
algorithm, mode, key, input_path, output_path, iv)
return self.run(self._DECRYPT_FILE, args)
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