You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: bench.rs
    path of file: ./repos/webrtc/stun/benches
    
    the code of the file until where you have to start completion: use std::io::Cursor;
use std::net::Ipv4Addr;
use std::ops::{Add, Sub};
use std::time::Duration;

use base64::prelude::BASE64_STANDARD;
use base64::Engine;
use criterion::{criterion_group, criterion_main, Criterion};
use rand::rngs::StdRng;
use rand::{Rng, SeedableRng};
use stun::addr::{AlternateServer, MappedAddress};
use stun::agent::{noop_handler, Agent, TransactionId};
use stun::attributes::{
    ATTR_CHANNEL_NUMBER, ATTR_DONT_FRAGMENT, ATTR_ERROR_CODE, ATTR_MESSAGE_INTEGRITY, ATTR_NONCE,
    ATTR_REALM, ATTR_SOFTWARE, ATTR_USERNAME, ATTR_XORMAPPED_ADDRESS,
};
use stun::error_code::{ErrorCode, ErrorCodeAttribute, CODE_STALE_NONCE};
use stun::fingerprint::{FINGERPRINT, FINGERPRINT_SIZE};
use stun::integrity::MessageIntegrity;
use stun::message::{
    is_message, Getter, Message, MessageType, Setter, ATTRIBUTE_HEADER_SIZE, BINDING_REQUEST,
    CLASS_REQUEST, MESSAGE_HEADER_SIZE, METHOD_BINDING,
};
use stun::textattrs::{Nonce, Realm, Software, Username};
use s
    
fn benchmark_message_integrity(c: &mut Criterion) {
    {
        let mut m = Message::new();
        let integrity = MessageIntegrity::new_short_term_integrity("password".to_owned());
        m.write_header();
        c.bench_function("BenchmarkMessageIntegrity_AddTo", |b| {
            b.iter(|| {
                m.write_header();
                integrity.add_to(&mut m).unwrap();
                m.reset();
            })
        });
    }

    {
        let mut m = Message::new();
        m.raw = Vec::with_capacity(1024);
        let software = Software::new(ATTR_SOFTWARE, "software".to_owned());
        let _ = software.add_to(&mut m);
        let integrity = MessageIntegrity::new_short_term_integrity("password".to_owned());
        m.write_header();
        integrity.add_to(&mut m).unwrap();
        m.write_header();
        c.bench_function("BenchmarkMessageIntegrity_Check", |b| {
            b.iter(|| {
                integrity.check(&mut m).unwrap();
            })
        });
    }
}