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This commit is contained in:
Richard O'Dwyer 2020-03-23 19:00:06 +00:00
parent 6f3f5371ce
commit fa6d1149d4
3 changed files with 28 additions and 27 deletions
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2
setup.cfg
View file

@ -11,7 +11,7 @@ norecursedirs = .git
[flake8] [flake8]
exclude = .git,__pycache__,legacy,build,dist,.tox exclude = .git,__pycache__,legacy,build,dist,.tox
max-complexity = 15 max-complexity = 15
ignore = E741,W504 ignore = E741,W504,W503
[yapf] [yapf]
based_on_style = pep8 based_on_style = pep8

9
src/mega/crypto.py
View file

@ -111,6 +111,7 @@ def mpi_to_int(s):
""" """
return int(binascii.hexlify(s[2:]), 16) return int(binascii.hexlify(s[2:]), 16)
def extended_gcd(a, b): def extended_gcd(a, b):
if a == 0: if a == 0:
return (b, 0, 1) return (b, 0, 1)
@ -118,19 +119,17 @@ def extended_gcd(a, b):
g, y, x = extended_gcd(b % a, a) g, y, x = extended_gcd(b % a, a)
return (g, x - (b // a) * y, y) return (g, x - (b // a) * y, y)
def modular_inverse(a, m): def modular_inverse(a, m):
"""
Thank you Mart Bakhoff for this solution.
https://stackoverflow.com/a/9758173
"""
g, x, y = extended_gcd(a, m) g, x, y = extended_gcd(a, m)
if g != 1: if g != 1:
raise Exception('modular inverse does not exist') raise Exception('modular inverse does not exist')
else: else:
return x % m return x % m
def base64_url_decode(data): def base64_url_decode(data):
data += '==' [(2 - len(data) * 3) % 4:] data += '=='[(2 - len(data) * 3) % 4:]
for search, replace in (('-', '+'), ('_', '/'), (',', '')): for search, replace in (('-', '+'), ('_', '/'), (',', '')):
data = data.replace(search, replace) data = data.replace(search, replace)
return base64.b64decode(data) return base64.b64decode(data)

44
src/mega/mega.py
View file

@ -303,9 +303,8 @@ class Mega:
if foldername != '': if foldername != '':
for file in files.items(): for file in files.items():
if ( if (
file[1]['a'] and file[1]['a'] and file[1]['t']
file[1]['t'] and and file[1]['a']['n'] == foldername
file[1]['a']['n'] == foldername
): ):
if parent_desc == file[1]['p']: if parent_desc == file[1]['p']:
parent_desc = file[0] parent_desc = file[0]
@ -333,23 +332,20 @@ class Mega:
parent_dir_name, files=files parent_dir_name, files=files
) )
if ( if (
filename and parent_node_id and filename and parent_node_id and file[1]['a']
file[1]['a'] and file[1]['a']['n'] == filename and and file[1]['a']['n'] == filename
parent_node_id == file[1]['p'] and parent_node_id == file[1]['p']
): ):
if ( if (
exclude_deleted and exclude_deleted
self._trash_folder_node_id == file[1]['p'] and self._trash_folder_node_id == file[1]['p']
): ):
continue continue
return file return file
if ( if (filename and file[1]['a'] and file[1]['a']['n'] == filename):
filename and
file[1]['a'] and file[1]['a']['n'] == filename
):
if ( if (
exclude_deleted and exclude_deleted
self._trash_folder_node_id == file[1]['p'] and self._trash_folder_node_id == file[1]['p']
): ):
continue continue
return file return file
@ -598,13 +594,13 @@ class Mega:
def _export_file(self, node): def _export_file(self, node):
node_data = self._node_data(node) node_data = self._node_data(node)
self._api_request([ self._api_request(
{ [{
'a': 'l', 'a': 'l',
'n': node_data['h'], 'n': node_data['h'],
'i': self.request_id 'i': self.request_id
} }]
]) )
return self.get_link(node) return self.get_link(node)
def export(self, path=None, node_id=None): def export(self, path=None, node_id=None):
@ -627,7 +623,9 @@ class Mega:
master_key_cipher = AES.new(a32_to_str(self.master_key), AES.MODE_ECB) master_key_cipher = AES.new(a32_to_str(self.master_key), AES.MODE_ECB)
ha = base64_url_encode( ha = base64_url_encode(
master_key_cipher.encrypt(node_data['h'].encode("utf8") + node_data['h'].encode("utf8")) master_key_cipher.encrypt(
node_data['h'].encode("utf8") + node_data['h'].encode("utf8")
)
) )
share_key = secrets.token_bytes(16) share_key = secrets.token_bytes(16)
@ -745,7 +743,9 @@ class Mega:
aes = AES.new(k_str, AES.MODE_CTR, counter=counter) aes = AES.new(k_str, AES.MODE_CTR, counter=counter)
mac_str = '\0' * 16 mac_str = '\0' * 16
mac_encryptor = AES.new(k_str, AES.MODE_CBC, mac_str.encode("utf8")) mac_encryptor = AES.new(
k_str, AES.MODE_CBC, mac_str.encode("utf8")
)
iv_str = a32_to_str([iv[0], iv[1], iv[0], iv[1]]) iv_str = a32_to_str([iv[0], iv[1], iv[0], iv[1]])
for chunk_start, chunk_size in get_chunks(file_size): for chunk_start, chunk_size in get_chunks(file_size):
@ -808,7 +808,9 @@ class Mega:
completion_file_handle = None completion_file_handle = None
mac_str = '\0' * 16 mac_str = '\0' * 16
mac_encryptor = AES.new(k_str, AES.MODE_CBC, mac_str.encode("utf8")) mac_encryptor = AES.new(
k_str, AES.MODE_CBC, mac_str.encode("utf8")
)
iv_str = a32_to_str([ul_key[4], ul_key[5], ul_key[4], ul_key[5]]) iv_str = a32_to_str([ul_key[4], ul_key[5], ul_key[4], ul_key[5]])
if file_size > 0: if file_size > 0:
for chunk_start, chunk_size in get_chunks(file_size): for chunk_start, chunk_size in get_chunks(file_size):