1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
import base64, hmac, socket, ssl, typing
def ssl_context(cert: str=None, key: str=None, verify: bool=True
) -> ssl.SSLContext:
context = ssl.SSLContext(ssl.PROTOCOL_TLS)
context.options |= ssl.OP_NO_SSLv2
context.options |= ssl.OP_NO_SSLv3
context.options |= ssl.OP_NO_TLSv1
context.load_default_certs()
if verify:
context.verify_mode = ssl.CERT_REQUIRED
if cert and key:
context.load_cert_chain(cert, keyfile=key)
return context
def ssl_wrap(sock: socket.socket, cert: str=None, key: str=None,
verify: bool=True, server_side: bool=False, hostname: str=None
) -> ssl.SSLSocket:
context = ssl_context(cert=cert, key=key, verify=verify)
return context.wrap_socket(sock, server_side=server_side,
server_hostname=hostname)
def constant_time_compare(a: typing.AnyStr, b: typing.AnyStr) -> bool:
return hmac.compare_digest(a, b)
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
def a_encrypt(key_filename: str, data: str):
with open(key_filename, "rb") as key_file:
key_content = key_file.read()
key = serialization.load_pem_public_key(
key_content, backend=default_backend())
out = key.encrypt(data.encode("utf8"), padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(), label=None))
return base64.b64encode(out).decode("iso-8859-1")
def a_decrypt(key_filename: str, data: str):
with open(key_filename, "rb") as key_file:
key_content = key_file.read()
key = serialization.load_pem_private_key(
key_content, password=None, backend=default_backend())
out = key.decrypt(base64.b64decode(data), padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(), label=None))
return out.decode("utf8")
|
