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53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Get one random 32-bit word from hardware RNG
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*
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* If Wi-Fi or Bluetooth are enabled, this function returns true random numbers. In other
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* situations, if true random numbers are required then consult the ESP-IDF Programming
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* Guide "Random Number Generation" section for necessary prerequisites.
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*
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* This function automatically busy-waits to ensure enough external entropy has been
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* introduced into the hardware RNG state, before returning a new random number. This delay
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* is very short (always less than 100 CPU cycles).
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*
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* @return Random value between 0 and UINT32_MAX
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*/
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uint32_t esp_random(void);
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/**
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* @brief Fill a buffer with random bytes from hardware RNG
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*
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* @note This function is implemented via calls to esp_random(), so the same
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* constraints apply.
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*
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* @param buf Pointer to buffer to fill with random numbers.
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* @param len Length of buffer in bytes
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*/
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void esp_fill_random(void *buf, size_t len);
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#ifdef __cplusplus
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}
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#endif
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