Files
dragonion-core/dragonion_core/proto/encryption/identity.py
2023-07-17 15:41:15 +03:00

51 lines
1.6 KiB
Python

from attrs import define
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
import base64
@define
class Identity:
"""
Valid identity has fields
username - in most cases same as filename, represents identity's username
private_key - key to decrypt incoming messages and get public key,
shouldn't be sent anywhere, generated via generate function
"""
username: str
private_key: rsa.RSAPrivateKey = None
def generate(self):
self.private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=4096
)
return self
def public_key(self):
return base64.urlsafe_b64encode(self.private_key.public_key().public_bytes(
encoding=serialization.Encoding.DER,
format=serialization.PublicFormat.PKCS1
))
def encrypt(self, content: str):
return base64.urlsafe_b64encode(self.private_key.public_key().encrypt(
content.encode(),
padding=padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
))
def decrypt(self, content: bytes):
return self.private_key.decrypt(
base64.urlsafe_b64decode(content),
padding=padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
).decode()