Implement Verifier Nonce Gen

[ekrembal]

Issue Description

We should store secret nonces in memory.

#[derive(Debug)]
pub struct NonceSession {
    pub private_key: secp256k1::SecretKey,
    pub nonces: Vec<(MuSigSecNonce, MuSigPubNonce)>,
}

#[derive(Debug)]
pub struct AllSessions {
    pub cur_id: u32,
    pub sessions: HashMap<u32, NonceSession>,
}

Add this to verifiers

    pub(crate) nonces:  Arc<Mutex<AllSessions>>

can be updated with

        let x = self.nonces;
        let mut y=  x.lock().await;
        let mut z = &mut *y;

        z.sessions.insert(z.cur_id, session);
        z.cur_id = z.cur_id + 1;

Tasks

Parts of the task:

• Research: do we really need to store pubNonces
• Add timestamp for nonce sessions
• Delete nonce sessions older than 1 day when nonce_gen is called
• generate secNonce pubNonce pairs
• create a session with new private key
• sign the public key with old private key
• return the stream

Deadline of the Issue

25/10/2024

[ceyhunsen]

Closed with #359