[NRF52840]: TRNG support #4056
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| /* | ||
| * Copyright (c) 2017 Nordic Semiconductor ASA | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without modification, | ||
| * are permitted provided that the following conditions are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright notice, this list | ||
| * of conditions and the following disclaimer. | ||
| * | ||
| * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA | ||
| * integrated circuit in a product or a software update for such product, must reproduce | ||
| * the above copyright notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the distribution. | ||
| * | ||
| * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software without specific prior | ||
| * written permission. | ||
| * | ||
| * 4. This software, with or without modification, must only be used with a | ||
| * Nordic Semiconductor ASA integrated circuit. | ||
| * | ||
| * 5. Any software provided in binary or object form under this license must not be reverse | ||
| * engineered, decompiled, modified and/or disassembled. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | ||
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR | ||
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | ||
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| */ | ||
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| #if defined(DEVICE_TRNG) | ||
| #include "trng_api.h" | ||
| #include "nrf_drv_rng.h" | ||
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| void trng_init(trng_t *obj) | ||
| { | ||
| (void) obj; | ||
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| (void)nrf_drv_rng_init(NULL); | ||
| } | ||
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| void trng_free(trng_t *obj) | ||
| { | ||
| (void) obj; | ||
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| nrf_drv_rng_uninit(); | ||
| } | ||
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| /* Get random data from NRF5x TRNG peripheral. | ||
| * | ||
| * This implementation returns num of random bytes in range <1, length>. | ||
| * For parameters description see trng_api.h file. | ||
| */ | ||
| int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length) | ||
| { | ||
| uint8_t bytes_available; | ||
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| (void) obj; | ||
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| nrf_drv_rng_bytes_available(&bytes_available); | ||
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| if (bytes_available == 0) { | ||
| nrf_drv_rng_block_rand(output, 1); | ||
| *output_length = 1; | ||
|
There was a problem hiding this comment. If I understand correct, this means gathering total one byte. This is not enough entropy. There was a problem hiding this comment. @RonEld
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| } else { | ||
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| if (bytes_available > length) { | ||
| bytes_available = length; | ||
| } | ||
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| if (nrf_drv_rng_rand(output, bytes_available) != NRF_SUCCESS) { | ||
| *output_length = 0; | ||
| return -1; | ||
| } else { | ||
| *output_length = bytes_available; | ||
| } | ||
| } | ||
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| return 0; | ||
| } | ||
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| #endif | ||
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It would be nice to check the return code for this function. The function does not have a return code though....