components/newlib/random.c (ESP-IDF)

/* * SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #include <sys/random.h> #include <sys/param.h> #include <assert.h> #include <errno.h> #include <string.h> #include "esp_random.h" #include "esp_log.h" static const char *TAG = "RANDOM"; ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) { // Flags are ignored because: // - esp_random is non-blocking so it works for both blocking and non-blocking calls, // - don't have opportunity so set som other source of entropy. ESP_LOGD(TAG, "getrandom(buf=0x%x, buflen=%d, flags=%u)", (int) buf, buflen, flags); if (buf == NULL) { errno = EFAULT; ESP_LOGD(TAG, "getrandom returns -1 (EFAULT)"); return -1; } esp_fill_random(buf, buflen); ESP_LOGD(TAG, "getrandom returns %d", buflen); return buflen; }