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- /**
- * Copyright (c) 2018 - 2020, 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 form under this license must not be reverse
- * engineered, decompiled, modified and/or disassembled.
- *
- * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
- *
- */
- #include "sdk_common.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
- #include "nrf_crypto_rng.h"
- #include "optiga_backend_rng.h"
- #include "optiga/optiga_crypt.h"
- /** @brief Minimal size output of random data in OPTIGA Trust X
- *
- * @details See Solution Reference Manual v1.35, section 4.4.3.4
- */
- #define OPTIGA_RNG_MIN_SIZE (0x8)
- /** @brief Maximum size output of random data in OPTIGA Trust X
- *
- * @details See Solution Reference Manual v1.35, section 4.4.3.4
- */
- #define OPTIGA_RNG_MAX_SIZE (0x100)
- ret_code_t nrf_crypto_rng_backend_init(void * const p_context,
- void * const p_temp_buffer)
- {
- UNUSED_PARAMETER(p_context);
- UNUSED_PARAMETER(p_temp_buffer);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_rng_backend_uninit(void * const p_context)
- {
- UNUSED_PARAMETER(p_context);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_rng_backend_vector_generate(void * const p_context,
- uint8_t * const p_target,
- size_t size,
- bool use_mutex)
- {
- UNUSED_PARAMETER(use_mutex);
- UNUSED_PARAMETER(p_context);
- uint8_t backup[OPTIGA_RNG_MIN_SIZE] = {0};
- optiga_lib_status_t err;
- uint8_t * out_cur = p_target;
- size_t size_left = size;
- size_t cur_len = size_left;
- do
- {
- cur_len = size_left > OPTIGA_RNG_MAX_SIZE ? OPTIGA_RNG_MAX_SIZE : size_left;
- if (cur_len < OPTIGA_RNG_MIN_SIZE)
- {
- err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, backup, OPTIGA_RNG_MIN_SIZE);
- if(err != OPTIGA_LIB_SUCCESS)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- memcpy(out_cur, backup, cur_len);
- }
- else
- {
- err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, out_cur, cur_len);
- if (err != OPTIGA_LIB_SUCCESS)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- }
- out_cur += cur_len;
- size_left -= cur_len;
- } while(size_left > 0);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_rng_backend_reseed(void * const p_context,
- void * p_temp_buffer,
- uint8_t * p_input_data,
- size_t size)
- {
- UNUSED_PARAMETER(p_context);
- UNUSED_PARAMETER(p_temp_buffer);
- UNUSED_PARAMETER(p_input_data);
- UNUSED_PARAMETER(size);
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO)
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