pub fn create_nonce(session_id: &[u8; 16], counter: u64) -> [u8; 24]Expand description
Examples found in repository?
examples/full_exchange.rs (line 14)
6fn main() {
7 let alice_kem = KEMPair::create();
8 let alice_signer = SignerPair::create();
9
10 let bob_kem = KEMPair::create();
11 let bob_signer = SignerPair::create();
12
13 // Create a base nonce with a new session id, and a counter of
14 let base_nonce = create_nonce(&gen_session_id(), 0);
15
16 // Lets create the message session for Alice first
17 let (mut alice_session, ciphertext) = MessageSession::new_initiator(
18 alice_kem,
19 alice_signer.clone(),
20 base_nonce,
21 &bob_kem.to_bytes().unwrap().0, // Bob's public KEM key
22 &bob_signer.to_bytes().unwrap().0, // Bob's public signer key
23 )
24 .unwrap();
25
26 // Now for Bob it would look like this
27 let mut bob_session = MessageSession::new_responder(
28 bob_kem,
29 bob_signer.clone(),
30 base_nonce,
31 &ciphertext,
32 &alice_signer.to_bytes().unwrap().0, // Alice's public signer key
33 )
34 .unwrap();
35
36 // Now both sessions contain a shared secret they use to encrypt and decrypt messages
37 // and a nonce that is incremented with each message sent or received.
38
39 // Alice creates a mesasge and prepares to send it to Bob
40 let message = b"Hello, Bob! This is a secret message.";
41 let encrypted_message = alice_session.craft_message(message).unwrap();
42
43 // Bob decrypts and verifies Alice's message
44 let raw_message = bob_session.validate_message(&encrypted_message).unwrap();
45
46 // Both message and raw_message are equal, let's print them out to illustrate
47 let message_str = String::from_utf8_lossy(message);
48 let raw_message_str = String::from_utf8_lossy(&raw_message);
49
50 println!("[1] Alice's message: {}", message_str);
51 println!("[2] Bob's decrypted message: {}", raw_message_str);
52
53 // Bob crafts a reply message to Alice
54 let reply = b"Hello, Alice! I received your message safely.";
55 let encrypted_reply = bob_session.craft_message(reply).unwrap();
56
57 // Alice decrypts and verifies Bob's reply
58 let raw_reply = alice_session.validate_message(&encrypted_reply).unwrap();
59
60 // Both reply and raw_reply are equal, let's print them again
61 let reply_str = String::from_utf8_lossy(reply);
62 let raw_reply_str = String::from_utf8_lossy(&raw_reply);
63
64 println!("[3] Bob's reply: {}", reply_str);
65 println!("[4] Alice's decrypted reply: {}", raw_reply_str);
66}