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# Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
# This file is licensed under the terms of the MIT License.
# See LICENSE.txt for details.
import collections
import logging
import os.path
import subprocess
AES128, AES192, AES256 = 'aes128', 'aes192', 'aes256'
ECB, CBC, CFB, OFB, CTR = 'ecb', 'cbc', 'cfb', 'ofb', 'ctr'
_SUPPORTED_ALGORITHMS = AES128, AES192, AES256
_SUPPORTED_MODES = ECB, CBC, CFB, OFB, CTR
def get_supported_algorithms():
return _SUPPORTED_ALGORITHMS
def get_supported_modes():
return _SUPPORTED_MODES
def mode_requires_init_vector(mode):
if mode not in _SUPPORTED_MODES:
raise NotImplementedError('unsupported mode of operation ' + s)
return mode != ECB
def to_supported_algorithm(s):
algorithm = is_algorithm_supported(s)
if algorithm is None:
raise NotImplementedError('unsupported algorithm ' + s)
return algorithm
def is_algorithm_supported(s):
s = s.lower()
if s in _SUPPORTED_ALGORITHMS:
return s
return None
def to_supported_mode(s):
mode = is_mode_supported(s)
if mode is None:
raise NotImplementedError('unsupported mode ' + s)
return mode
def is_mode_supported(s):
s = s.lower()
if s in _SUPPORTED_MODES:
return s
if s == CFB + '128':
return CFB
return None
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, collections.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
self._logger = logging.getLogger(__name__)
_ENCRYPT_BLOCK = 'encrypt_block.exe'
_DECRYPT_BLOCK = 'decrypt_block.exe'
_ENCRYPT_FILE = 'encrypt_file.exe'
_DECRYPT_FILE = 'decrypt_file.exe'
def run(self, tool_path, args):
cmd_list = ['sde', '--', tool_path] if self._use_sde else [tool_path]
cmd_list.extend(args)
logging.info('Trying to execute: {0}'.format(
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' + e.output)
raise
logging.info('Output:\n' + 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', algorithm,
'--mode', 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, collections.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):
return self.run(self._ENCRYPT_BLOCK,
self._build_block_args(algorithm, mode, inputs, use_boxes))
def run_decrypt_block(self, algorithm, mode, inputs, use_boxes=False):
return self.run(self._DECRYPT_BLOCK,
self._build_block_args(algorithm, mode, inputs, use_boxes))
@staticmethod
def _file_settings_to_args(algorithm, mode, key, input_path, output_path, iv=None):
args = [
'--algorithm', algorithm,
'--mode', mode,
'--key', key,
'--input-path', input_path,
'--output-path', output_path
]
if mode_requires_init_vector(mode):
if not iv:
raise ValueError('mode \'{}\' requires initialization vector'.format(mode))
args.extend(('--iv', iv))
return args
def run_encrypt_file(self, algorithm, mode, key, input_path, output_path, iv=None):
return self.run(self._ENCRYPT_FILE,
self._file_settings_to_args(algorithm, mode, key, input_path, output_path, iv))
def run_decrypt_file(self, algorithm, mode, key, input_path, output_path, iv=None):
return self.run(self._DECRYPT_FILE,
self._file_settings_to_args(algorithm, mode, key, input_path, output_path, iv))
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