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use super::{Error, XSALSA20_NONCE_BYTES}; use rand::{Rng, OsRng}; use std::time::SystemTime; const MAX_ARRAY_LEN: usize = 128usize; pub fn random_fill(arr: &mut [u8])->Result<(), Error>{ let l = arr.len(); if l > MAX_ARRAY_LEN{ return Err(Error::InvalidBufferLength); } let mut r = OsRng::new().unwrap(); r.fill_bytes(&mut arr[..l]); Ok(()) } pub fn gen_nonce() ->[u8; XSALSA20_NONCE_BYTES]{ let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) .unwrap() .as_secs() .to_string(); let counter = now.as_bytes(); let l = counter.len(); let mut nonce = [0u8;XSALSA20_NONCE_BYTES]; nonce[..l].copy_from_slice(&counter); let mut r = OsRng::new().unwrap(); r.fill_bytes(&mut nonce[l..]); nonce }