| //! Implementation for ESP-IDF |
| use crate::Error; |
| use core::{ffi::c_void, mem::MaybeUninit}; |
| |
| extern "C" { |
| fn esp_fill_random(buf: *mut c_void, len: usize) -> u32; |
| } |
| |
| pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> { |
| // Not that NOT enabling WiFi, BT, or the voltage noise entropy source (via `bootloader_random_enable`) |
| // will cause ESP-IDF to return pseudo-random numbers based on the voltage noise entropy, after the initial boot process: |
| // https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/random.html |
| // |
| // However tracking if some of these entropy sources is enabled is way too difficult to implement here |
| unsafe { esp_fill_random(dest.as_mut_ptr().cast(), dest.len()) }; |
| |
| Ok(()) |
| } |
