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# Copyright (c) 2022 Tulir Asokan
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from typing import Any, Dict, Optional, cast
from datetime import datetime
import olm
from mautrix.types import (
DeviceID,
EncryptionAlgorithm,
EncryptionKeyAlgorithm,
IdentityKey,
SigningKey,
UserID,
)
from . import base
from .sessions import Session
class OlmAccount(olm.Account):
shared: bool
_signing_key: Optional[SigningKey]
_identity_key: Optional[IdentityKey]
def __init__(self) -> None:
super().__init__()
self.shared = False
self._signing_key = None
self._identity_key = None
@property
def signing_key(self) -> SigningKey:
if self._signing_key is None:
self._signing_key = SigningKey(self.identity_keys["ed25519"])
return self._signing_key
@property
def identity_key(self) -> IdentityKey:
if self._identity_key is None:
self._identity_key = IdentityKey(self.identity_keys["curve25519"])
return self._identity_key
@property
def fingerprint(self) -> str:
"""
Fingerprint is the base64-encoded signing key of this account, with spaces every 4
characters. This is what is used for manual device verification.
"""
key = self.signing_key
return " ".join([key[i : i + 4] for i in range(0, len(key), 4)])
@classmethod
def from_pickle(cls, pickle: bytes, passphrase: str, shared: bool) -> "OlmAccount":
account = cast(OlmAccount, super().from_pickle(pickle, passphrase))
account.shared = shared
account._signing_key = None
account._identity_key = None
return account
def new_inbound_session(self, sender_key: IdentityKey, ciphertext: str) -> Session:
session = olm.InboundSession(self, olm.OlmPreKeyMessage(ciphertext), sender_key)
self.remove_one_time_keys(session)
return Session.from_pickle(
session.pickle("roundtrip"), passphrase="roundtrip", creation_time=datetime.now()
)
def new_outbound_session(self, target_key: IdentityKey, one_time_key: IdentityKey) -> Session:
session = olm.OutboundSession(self, target_key, one_time_key)
return Session.from_pickle(
session.pickle("roundtrip"), passphrase="roundtrip", creation_time=datetime.now()
)
def get_device_keys(self, user_id: UserID, device_id: DeviceID) -> Dict[str, Any]:
device_keys = {
"user_id": user_id,
"device_id": device_id,
"algorithms": [EncryptionAlgorithm.OLM_V1.value, EncryptionAlgorithm.MEGOLM_V1.value],
"keys": {
f"{algorithm}:{device_id}": key for algorithm, key in self.identity_keys.items()
},
}
signature = self.sign(base.canonical_json(device_keys))
device_keys["signatures"] = {
user_id: {f"{EncryptionKeyAlgorithm.ED25519}:{device_id}": signature}
}
return device_keys
def get_one_time_keys(
self, user_id: UserID, device_id: DeviceID, current_otk_count: int
) -> Dict[str, Any]:
new_count = self.max_one_time_keys // 2 - current_otk_count
if new_count > 0:
self.generate_one_time_keys(new_count)
keys = {}
for key_id, key in self.one_time_keys.get("curve25519", {}).items():
signature = self.sign(base.canonical_json({"key": key}))
keys[f"{EncryptionKeyAlgorithm.SIGNED_CURVE25519}:{key_id}"] = {
"key": key,
"signatures": {
user_id: {f"{EncryptionKeyAlgorithm.ED25519}:{device_id}": signature}
},
}
self.mark_keys_as_published()
return keys
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