Chat with friends in a truly cryptographically secure way.
Intended to work as 5th OSI layer usually on top of TCP/IP.
- shared key is obtained using ECDHE. Transferred DH public keys are signed and verified with pre-obtained Ed25519 public keys.
- auth key is derived from shared key using ConcatKDF.
- Message using ChaCha20-Poly1305 with auth key.
- Generate private key, give your public key to friend.
- Get friend's public key through reliable channel.
from pathlib import Path
from spproto.key import generate_private_key, get_public_key
def main() -> None:
privkey_path = Path('~/Desktop/privkey').expanduser()
pubkey_path = Path('~/Desktop/pubkey').expanduser()
privkey = generate_private_key()
pubkey = get_public_key(privkey)
privkey_path.write_bytes(privkey)
pubkey_path.write_bytes(pubkey)
main()Connect to your friend
import asyncio
from pathlib import Path
from spproto.client import connect
async def main() -> None:
privkey = Path('~/Desktop/privkey').expanduser().read_bytes()
peer_pubkey = Path('~/Desktop/friend_pubkey').expanduser().read_bytes()
host = '1.2.3.4'
port = 4321
async with connect(host, port, privkey, peer_pubkey) as conn:
await conn.send(b'Hello, server!')
print(await conn.receive())
asyncio.run(main())Make your friend available to connect to you.
import asyncio
from pathlib import Path
from spproto.connection import Connection
from spproto.server import serve
async def callback(
conn: Connection
) -> None:
print(await conn.receive())
await conn.send(b'Hello, client')
async def main() -> None:
privkey = Path('~/Desktop/privkey').expanduser().read_bytes()
peer_pubkey = Path('~/Desktop/friend_pubkey').expanduser().read_bytes()
host = '1.2.3.4'
port = 4321
await serve(host, port, privkey, peer_pubkey, callback)
asyncio.run(main())