Method sign

nodedb-crdt/src/signing.rs:205–214

Sign delta bytes for a specific device and sequence number. HMAC input canonical layout: `delta_bytes || user_id.to_le_bytes(8) || device_id.to_le_bytes(8) || seq_no.to_le_bytes(8)`

(
        &self,
        user_id: u64,
        device_id: u64,
        seq_no: u64,
        delta_bytes: &[u8],
    )

    /// HMAC input canonical layout:
    /// `delta_bytes || user_id.to_le_bytes(8) || device_id.to_le_bytes(8) || seq_no.to_le_bytes(8)`
    pub fn sign(
        &self,
        user_id: u64,
        device_id: u64,
        seq_no: u64,
        delta_bytes: &[u8],
    ) -> Result<[u8; SIGNATURE_SIZE]> {
        let key = self.device_key(user_id, device_id)?;
        Ok(compute_hmac(&key, user_id, device_id, seq_no, delta_bytes))
    }

    /// Verify a delta signature. Returns Ok(()) if valid.
    ///