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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]
exclude = .git,__pycache__,legacy,build,dist,.tox
max-complexity = 15
ignore = E741,W504
ignore = E741,W504,W503
[yapf]
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)
def extended_gcd(a, b):
if a == 0:
return (b, 0, 1)
@ -118,19 +119,17 @@ def extended_gcd(a, b):
g, y, x = extended_gcd(b % a, a)
return (g, x - (b // a) * y, y)
def modular_inverse(a, m):
"""
Thank you Mart Bakhoff for this solution.
https://stackoverflow.com/a/9758173
"""
g, x, y = extended_gcd(a, m)
if g != 1:
raise Exception('modular inverse does not exist')
else:
return x % m
def base64_url_decode(data):
data += '==' [(2 - len(data) * 3) % 4:]
data += '=='[(2 - len(data) * 3) % 4:]
for search, replace in (('-', '+'), ('_', '/'), (',', '')):
data = data.replace(search, replace)
return base64.b64decode(data)

44
src/mega/mega.py
View file

@ -303,9 +303,8 @@ class Mega:
if foldername != '':
for file in files.items():
if (
file[1]['a'] and
file[1]['t'] and
file[1]['a']['n'] == foldername
file[1]['a'] and file[1]['t']
and file[1]['a']['n'] == foldername
):
if parent_desc == file[1]['p']:
parent_desc = file[0]
@ -333,23 +332,20 @@ class Mega:
parent_dir_name, files=files
)
if (
filename and parent_node_id and
file[1]['a'] and file[1]['a']['n'] == filename and
parent_node_id == file[1]['p']
filename and parent_node_id and file[1]['a']
and file[1]['a']['n'] == filename
and parent_node_id == file[1]['p']
):
if (
exclude_deleted and
self._trash_folder_node_id == file[1]['p']
exclude_deleted
and self._trash_folder_node_id == file[1]['p']
):
continue
return file
if (
filename and
file[1]['a'] and file[1]['a']['n'] == filename
):
if (filename and file[1]['a'] and file[1]['a']['n'] == filename):
if (
exclude_deleted and
self._trash_folder_node_id == file[1]['p']
exclude_deleted
and self._trash_folder_node_id == file[1]['p']
):
continue
return file
@ -598,13 +594,13 @@ class Mega:
def _export_file(self, node):
node_data = self._node_data(node)
self._api_request([
{
self._api_request(
[{
'a': 'l',
'n': node_data['h'],
'i': self.request_id
}
])
}]
)
return self.get_link(node)
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)
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)
@ -745,7 +743,9 @@ class Mega:
aes = AES.new(k_str, AES.MODE_CTR, counter=counter)
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]])
for chunk_start, chunk_size in get_chunks(file_size):
@ -808,7 +808,9 @@ class Mega:
completion_file_handle = None
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]])
if file_size > 0:
for chunk_start, chunk_size in get_chunks(file_size):