add getrandom 0.2.17 with custom source

Cargo.lock

@@ -435,6 +435,7 @@ dependencies = [
  "esp-radio",
  "esp-rtos",
  "esp-storage",
+ "getrandom",
  "hashbrown",
  "log",
  "nb 1.1.0",
@@ -1273,6 +1274,17 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "group"
 version = "0.13.0"
@@ -2130,6 +2142,12 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
+[[package]]
+name = "wasi"
+version = "0.11.1+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.108"

ecu-esp32/Cargo.toml

@@ -78,3 +78,4 @@ trouble-host = { version =  "0.5.1", default-features = false, features = [
  "dev-disable-csprng-seed-requirement"  # !!!!
 ]}
 esp-nvs = { version = "0.2.0", features = ["esp32c3"] }
+getrandom = { version = "0.2.17", features = ["custom"] }

ecu-esp32/src/main.rs

@@ -20,6 +20,17 @@ pub mod streamer;
 pub mod ota;
 pub mod wibble;
 
+use getrandom::Error;
+
+pub fn getrandom_custom(dest: &mut [u8]) -> Result<(), Error> {
+    unsafe {
+	esp_hal::rng::Rng::new().read_into_raw(dest.as_mut_ptr(), dest.len())
+    };
+    Ok(())
+}
+use getrandom::register_custom_getrandom;
+register_custom_getrandom!(getrandom_custom);
+
 use esp_hal::{
     timer::timg::TimerGroup,
     clock::CpuClock,