Dreaded_X/pico_p1
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Use true randomness as a seed for the PRNG, also added a CSPRN

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This commit is contained in:
Dreaded_X 2023-08-27 04:10:03 +02:00
parent 686d4be560
commit b9e8ba3ea6
Signed by: Dreaded_X
GPG Key ID: 96C9F2B15F72C54B
3 changed files with 36 additions and 9 deletions
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17
Cargo.lock generated
View File

@ -1172,6 +1172,12 @@ dependencies = [
"syn 1.0.109",
]
[[package]]
name = "ppv-lite86"
version = "0.2.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
[[package]]
name = "precomputed-hash"
version = "0.1.1"
@ -1226,6 +1232,17 @@ version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
dependencies = [
"rand_chacha",
"rand_core",
]
[[package]]
name = "rand_chacha"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
dependencies = [
"ppv-lite86",
"rand_core",
]

1
Cargo.toml
View File

@ -64,6 +64,7 @@ rust-mqtt = { version = "0.1.5", features = [
rand = { version = "0.8.5", features = [
"nightly",
"small_rng",
"std_rng",
], default-features = false }
serde-json-core = "0.5.1"

27
src/main.rs
View File

@ -12,7 +12,9 @@ use embassy_futures::{
};
use embassy_net::{tcp::TcpSocket, Config, Ipv4Address, Stack, StackResources};
use embassy_rp::{
bind_interrupts, gpio,
bind_interrupts,
clocks::RoscRng,
gpio,
peripherals::{DMA_CH0, PIN_23, PIN_25, PIO0, UART0},
pio::{self, Pio},
uart::{self, BufferedUartRx, Parity},
@ -27,7 +29,10 @@ use embassy_sync::{
};
use gpio::{Level, Output};
use heapless::Vec;
use rand::{rngs::SmallRng, RngCore, SeedableRng};
use rand::{
rngs::{SmallRng, StdRng},
RngCore, SeedableRng,
};
use rust_mqtt::client::{client::MqttClient, client_config::ClientConfig};
use static_cell::make_static;
@ -187,17 +192,16 @@ async fn main(spawner: Spawner) {
let config = Config::dhcpv4(Default::default());
let mut seed = [0; 8];
// TODO: Make the seed actually random?
let mut rng = SmallRng::seed_from_u64(0x51ac_3101_6468_8cdf);
rng.fill_bytes(&mut seed);
let seed = u64::from_le_bytes(seed);
// Use the Ring Oscillator of the RP2040 as a source of true randomness to seed the
// cryptographically secure PRNG
let mut rng_rosc = RoscRng;
let mut rng = StdRng::from_rng(&mut rng_rosc).unwrap();
let stack = make_static!(Stack::new(
net_device,
config,
make_static!(StackResources::<2>::new()),
seed,
rng.next_u64(),
));
spawner.spawn(net_task(stack)).unwrap();
@ -232,7 +236,12 @@ async fn main(spawner: Spawner) {
}
info!("TCP Connected!");
let mut config = ClientConfig::new(rust_mqtt::client::client_config::MqttVersion::MQTTv5, rng);
let mut config = ClientConfig::new(
rust_mqtt::client::client_config::MqttVersion::MQTTv5,
// Use fast and simple PRNG to generate packet identifiers, there is no need for this to be
// cryptographically secure
SmallRng::from_rng(&mut rng_rosc).unwrap(),
);
config.add_username(env!("MQTT_USERNAME"));
config.add_password(env!("MQTT_PASSWORD"));