From 729a7c2cc5e5fe1d9badb0a0f1c758ba2c57b6aa Mon Sep 17 00:00:00 2001
From: Ulf Lilleengen <ulf@digili.no>
Date: Tue, 4 Nov 2025 13:10:45 +0100
Subject: feat: initial support for nrf54 CRACEN peripheral

The CRACEN peripheral supports random number generation,
digest and key generation, and key exchange.

The initial support implements random number generation.
---
 examples/nrf54l15/Cargo.toml     |  2 ++
 examples/nrf54l15/src/bin/rng.rs | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 examples/nrf54l15/src/bin/rng.rs

(limited to 'examples')

diff --git a/examples/nrf54l15/Cargo.toml b/examples/nrf54l15/Cargo.toml
index 14a80efe7..4ef77279f 100644
--- a/examples/nrf54l15/Cargo.toml
+++ b/examples/nrf54l15/Cargo.toml
@@ -14,6 +14,8 @@ embassy-nrf = { version = "0.8.0", path = "../../embassy-nrf", features = ["defm
 embedded-io = { version = "0.6.0", features = ["defmt-03"]  }
 embedded-io-async = { version = "0.6.1", features = ["defmt-03"] }
 
+rand = { version = "0.9.0", default-features = false }
+
 defmt = "1.0.1"
 defmt-rtt = "1.0.0"
 panic-probe = { version = "1.0.0", features = ["print-defmt"] }
diff --git a/examples/nrf54l15/src/bin/rng.rs b/examples/nrf54l15/src/bin/rng.rs
new file mode 100644
index 000000000..3be035b9c
--- /dev/null
+++ b/examples/nrf54l15/src/bin/rng.rs
@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_nrf::cracen::Cracen;
+use embassy_nrf::{bind_interrupts, cracen, peripherals};
+use rand::Rng as _;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+    let mut rng = Cracen::new_blocking(p.CRACEN);
+
+    // Async API
+    let mut bytes = [0; 4];
+    rng.blocking_fill_bytes(&mut bytes);
+    defmt::info!("Some random bytes: {:?}", bytes);
+
+    // Sync API with `rand`
+    defmt::info!("A random number from 1 to 10: {:?}", rng.random_range(1..=10));
+
+    let mut bytes = [0; 1024];
+    rng.blocking_fill_bytes(&mut bytes);
+    let zero_count: u32 = bytes.iter().fold(0, |acc, val| acc + val.count_zeros());
+    let one_count: u32 = bytes.iter().fold(0, |acc, val| acc + val.count_ones());
+    defmt::info!("Chance of zero: {}%", zero_count * 100 / (bytes.len() as u32 * 8));
+    defmt::info!("Chance of one: {}%", one_count * 100 / (bytes.len() as u32 * 8));
+}
-- 
cgit