esp-idf/components/libsodium/port/randombytes_esp32.c

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// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "randombytes_default.h"
#include "esp_system.h"
static void randombytes_esp32_random_buf(void * const buf, const size_t size)
{
uint8_t *p = (uint8_t *)buf;
for (size_t i = 0; i < size; i++) {
p[i] = esp_random();
}
}
static const char *randombytes_esp32_implementation_name(void)
{
return "esp32";
}
/*
Plug the ESP32 hardware RNG into libsodium's custom RNG support, as per
https://download.libsodium.org/doc/advanced/custom_rng.html
Note that this RNG is selected by default (see randombytes_default.h), so there
is no need to call randombytes_set_implementation().
*/
const struct randombytes_implementation randombytes_esp32_implementation = {
.implementation_name = randombytes_esp32_implementation_name,
.random = esp_random,
.stir = NULL,
.uniform = NULL,
.buf = randombytes_esp32_random_buf,
.close = NULL,
};