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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
use std::io::{Read, Write};
use std::net::TcpStream;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use byteorder::{BigEndian, ByteOrder};
use crypto_box::aead::{Aead, Payload};
use parking_lot::Mutex;
use sha2::digest::generic_array::GenericArray;
use sha2::Digest;
use typenum::U24;
use crate::event::Event;
use crate::result::VentedResult;
pub use crypto_box::PublicKey;
pub use crypto_box::SecretKey;
#[derive(Clone)]
pub struct CryptoStream {
send_stream: Arc<Mutex<TcpStream>>,
recv_stream: Arc<Mutex<TcpStream>>,
sent_count: Arc<AtomicUsize>,
recv_count: Arc<AtomicUsize>,
secret_box: Arc<Mutex<crypto_box::ChaChaBox>>,
}
impl CryptoStream {
pub fn new(inner: TcpStream, secret_box: crypto_box::ChaChaBox) -> VentedResult<Self> {
inner.set_nonblocking(false)?;
let send_stream = Arc::new(Mutex::new(inner.try_clone()?));
let recv_stream = Arc::new(Mutex::new(inner));
Ok(Self {
send_stream,
recv_stream,
sent_count: Arc::new(AtomicUsize::new(0)),
recv_count: Arc::new(AtomicUsize::new(0)),
secret_box: Arc::new(Mutex::new(secret_box)),
})
}
pub fn send(&self, mut event: Event) -> VentedResult<()> {
let number = self.sent_count.fetch_add(1, Ordering::SeqCst);
let nonce = generate_nonce(number);
let ciphertext = self.secret_box.lock().encrypt(
&nonce,
Payload {
msg: &event.as_bytes(),
aad: &[],
},
)?;
let mut stream = self.send_stream.lock();
let mut length_raw = [0u8; 8];
BigEndian::write_u64(&mut length_raw, ciphertext.len() as u64);
log::trace!("Encoded event '{}' to raw message", event.name);
stream.write(&length_raw)?;
stream.write(&ciphertext)?;
stream.flush()?;
log::trace!("Event sent");
Ok(())
}
pub fn read(&self) -> VentedResult<Event> {
let mut stream = self.recv_stream.lock();
let mut length_raw = [0u8; 8];
stream.read_exact(&mut length_raw)?;
let length = BigEndian::read_u64(&length_raw);
let mut ciphertext = vec![0u8; length as usize];
stream.read(&mut ciphertext)?;
log::trace!("Received raw message");
let number = self.recv_count.fetch_add(1, Ordering::SeqCst);
let nonce = generate_nonce(number);
let plaintext = self.secret_box.lock().decrypt(
&nonce,
Payload {
msg: &ciphertext,
aad: &[],
},
)?;
let event = Event::from_bytes(&mut &plaintext[..])?;
log::trace!("Decoded message to event '{}'", event.name);
Ok(event)
}
}
fn generate_nonce(number: usize) -> GenericArray<u8, U24> {
let result = sha2::Sha256::digest(&number.to_be_bytes()).to_vec();
let mut nonce = [0u8; 24];
nonce.copy_from_slice(&result[0..24]);
nonce.into()
}