148 lines
4.8 KiB
C
148 lines
4.8 KiB
C
/**
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* Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "sdk_common.h"
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#if NRF_MODULE_ENABLED(NRF_CRYPTO)
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
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#include "nrf_crypto_rng.h"
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#include "optiga_backend_rng.h"
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#include "optiga/optiga_crypt.h"
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/** @brief Minimal size output of random data in OPTIGA Trust X
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*
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* @details See Solution Reference Manual v1.35, section 4.4.3.4
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*/
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#define OPTIGA_RNG_MIN_SIZE (0x8)
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/** @brief Maximum size output of random data in OPTIGA Trust X
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*
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* @details See Solution Reference Manual v1.35, section 4.4.3.4
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*/
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#define OPTIGA_RNG_MAX_SIZE (0x100)
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ret_code_t nrf_crypto_rng_backend_init(void * const p_context,
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void * const p_temp_buffer)
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{
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UNUSED_PARAMETER(p_context);
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UNUSED_PARAMETER(p_temp_buffer);
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return NRF_SUCCESS;
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}
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ret_code_t nrf_crypto_rng_backend_uninit(void * const p_context)
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{
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UNUSED_PARAMETER(p_context);
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return NRF_SUCCESS;
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}
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ret_code_t nrf_crypto_rng_backend_vector_generate(void * const p_context,
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uint8_t * const p_target,
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size_t size,
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bool use_mutex)
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{
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UNUSED_PARAMETER(use_mutex);
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UNUSED_PARAMETER(p_context);
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uint8_t backup[OPTIGA_RNG_MIN_SIZE] = {0};
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optiga_lib_status_t err;
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uint8_t * out_cur = p_target;
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size_t size_left = size;
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size_t cur_len = size_left;
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do
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{
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cur_len = size_left > OPTIGA_RNG_MAX_SIZE ? OPTIGA_RNG_MAX_SIZE : size_left;
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if (cur_len < OPTIGA_RNG_MIN_SIZE)
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{
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err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, backup, OPTIGA_RNG_MIN_SIZE);
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if(err != OPTIGA_LIB_SUCCESS)
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{
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return NRF_ERROR_CRYPTO_INTERNAL;
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}
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memcpy(out_cur, backup, cur_len);
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}
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else
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{
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err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, out_cur, cur_len);
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if (err != OPTIGA_LIB_SUCCESS)
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{
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return NRF_ERROR_CRYPTO_INTERNAL;
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}
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}
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out_cur += cur_len;
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size_left -= cur_len;
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} while(size_left > 0);
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return NRF_SUCCESS;
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}
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ret_code_t nrf_crypto_rng_backend_reseed(void * const p_context,
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void * p_temp_buffer,
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uint8_t * p_input_data,
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size_t size)
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{
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UNUSED_PARAMETER(p_context);
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UNUSED_PARAMETER(p_temp_buffer);
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UNUSED_PARAMETER(p_input_data);
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UNUSED_PARAMETER(size);
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return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
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}
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO)
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