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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_CC310)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_RNG)
- #include "nrf_crypto_error.h"
- #include "nrf_log.h"
- #include "cc310_backend_mutex.h"
- #include "cc310_backend_rng.h"
- #include "crys_rnd.h"
- #include "crys_rnd_error.h"
- #include "cc310_backend_shared.h"
- static ret_code_t result_get(CRYSError_t err_code)
- {
- ret_code_t ret_val;
- switch (err_code)
- {
- case CRYS_OK:
- ret_val = NRF_SUCCESS;
- break;
- case CRYS_RND_ILLEGAL_PARAMETER_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM;
- break;
- case CRYS_RND_INIT_FAILED:
- case CRYS_RND_STARTUP_FAILED:
- case CRYS_RND_INSTANTIATION_ERROR:
- ret_val = NRF_ERROR_CRYPTO_RNG_INIT_FAILED;
- break;
- case CRYS_RND_IS_NOT_SUPPORTED:
- case CRYS_RND_CAN_NOT_GENERATE_RAND_IN_RANGE:
- case CRYS_RND_TRNG_KAT_NOT_SUPPORTED_ERROR:
- case CRYS_RND_SRAM_NOT_SUPPORTED_ERROR:
- case CRYS_RND_OPERATION_IS_NOT_SUPPORTED_ERROR:
- ret_val = NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- break;
- case CRYS_RND_DATA_OUT_POINTER_INVALID_ERROR:
- case CRYS_RND_VECTOR_OUT_PTR_ERROR:
- ret_val = NRF_ERROR_CRYPTO_OUTPUT_NULL;
- break;
- case CRYS_RND_ADDITIONAL_INPUT_BUFFER_NULL:
- case CRYS_RND_WORK_BUFFER_PTR_INVALID_ERROR:
- case CRYS_RND_ILLEGAL_DATA_PTR_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INPUT_NULL;
- break;
- case CRYS_RND_DATA_SIZE_OVERFLOW_ERROR:
- case CRYS_RND_ADDITIONAL_INPUT_SIZE_ERROR:
- case CRYS_RND_ILLEGAL_DATA_SIZE_ERROR:
- case CRYS_RND_MAX_VECTOR_IS_TOO_SMALL_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH;
- break;
- case CRYS_RND_ILLEGAL_AES_KEY_SIZE_ERROR:
- case CRYS_RND_VECTOR_OUT_SIZE_ERROR:
- case CRYS_RND_VECTOR_SIZE_ERROR:
- ret_val = NRF_ERROR_CRYPTO_OUTPUT_LENGTH;
- break;
- case CRYS_RND_CONTEXT_PTR_INVALID_ERROR:
- case CRYS_RND_STATE_PTR_INVALID_ERROR:
- ret_val = NRF_ERROR_CRYPTO_CONTEXT_NULL;
- break;
- case CRYS_RND_INSTANTIATION_NOT_DONE_ERROR:
- ret_val = NRF_ERROR_CRYPTO_CONTEXT_NOT_INITIALIZED;
- break;
- case CRYS_RND_RESEED_COUNTER_OVERFLOW_ERROR:
- ret_val = NRF_ERROR_CRYPTO_RNG_RESEED_REQUIRED;
- break;
- case CRYS_RND_CPRNG_TEST_FAIL_ERROR:
- case CRYS_RND_TRNG_LOSS_SAMPLES_ERROR:
- case CRYS_RND_TRNG_TIME_EXCEED_ERROR:
- case CRYS_RND_TRNG_LOSS_SAMPLES_AND_TIME_EXCEED_ERROR:
- case CRYS_RND_IS_KAT_MODE_ERROR:
- case CRYS_RND_STATE_VALIDATION_TAG_ERROR:
- case CRYS_RND_GEN_VECTOR_FUNC_ERROR:
- case CRYS_RND_TRNG_ERRORS_ERROR:
- case CRYS_RND_KAT_DATA_PARAMS_ERROR:
- case CRYS_RND_AES_ERROR:
- default:
- ret_val = NRF_ERROR_CRYPTO_INTERNAL;
- break;
- }
- return ret_val;
- }
- ret_code_t nrf_crypto_rng_backend_init(void * const p_context,
- void * const p_temp_buffer)
- {
- bool mutex_locked;
- CRYSError_t err_code;
- ret_code_t ret_val;
- CRYS_RND_WorkBuff_t * p_work_buffer = (CRYS_RND_WorkBuff_t *)p_temp_buffer;
- nrf_crypto_backend_rng_context_t * p_ctx = (nrf_crypto_backend_rng_context_t *)p_context;
- // Save time by not reinitializing an already valid CC310 RNG context.
- // (Useful for example in case the context was stored in retained memory during system OFF.)
- if (p_ctx->header.init_value == NRF_CRYPTO_RNG_CONTEXT_INIT_MAGIC_VALUE)
- {
- return NRF_SUCCESS;
- }
- mutex_locked = cc310_backend_mutex_trylock();
- VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);
- err_code = CRYS_RndInit(&p_ctx->crys_rnd_state, p_work_buffer);
- ret_val = result_get(err_code);
- cc310_backend_mutex_unlock();
- return ret_val;
- }
- ret_code_t nrf_crypto_rng_backend_uninit(void * const p_context)
- {
- bool mutex_locked;
- CRYSError_t err_code;
- ret_code_t ret_val;
- CRYS_RND_State_t * p_crys_rnd_state =
- &((nrf_crypto_backend_rng_context_t *)p_context)->crys_rnd_state;
- mutex_locked = cc310_backend_mutex_trylock();
- VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);
- err_code = CRYS_RND_UnInstantiation(p_crys_rnd_state);
- ret_val = result_get(err_code);
- cc310_backend_mutex_unlock();
- return ret_val;
- }
- ret_code_t nrf_crypto_rng_backend_vector_generate(void * const p_context,
- uint8_t * const p_target,
- size_t size,
- bool use_mutex)
- {
- bool mutex_locked;
- CRYSError_t err_code;
- ret_code_t ret_val;
- CRYS_RND_State_t * p_crys_rnd_state =
- &((nrf_crypto_backend_rng_context_t *)p_context)->crys_rnd_state;
- if (use_mutex)
- {
- mutex_locked = cc310_backend_mutex_trylock();
- VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);
- }
- err_code = CRYS_RND_GenerateVector(p_crys_rnd_state, size, p_target);
- ret_val = result_get(err_code);
- if (use_mutex)
- {
- cc310_backend_mutex_unlock();
- }
- return ret_val;
- }
- ret_code_t nrf_crypto_rng_backend_reseed(void * const p_context,
- void * p_temp_buffer,
- uint8_t * p_input_data,
- size_t size)
- {
- bool mutex_locked;
- CRYSError_t err_code;
- ret_code_t ret_val = NRF_SUCCESS;
- CRYS_RND_WorkBuff_t * p_work_buffer = (CRYS_RND_WorkBuff_t *)p_temp_buffer;
- CRYS_RND_State_t * p_crys_rnd_state =
- &((nrf_crypto_backend_rng_context_t *)p_context)->crys_rnd_state;
- VERIFY_TRUE(size <= CRYS_RND_ADDITINAL_INPUT_MAX_SIZE_WORDS, NRF_ERROR_CRYPTO_INPUT_LENGTH);
- VERIFY_TRUE((size & 0x3) == 0, NRF_ERROR_CRYPTO_INTERNAL);
- mutex_locked = cc310_backend_mutex_trylock();
- VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);
- if (size > 0)
- {
- err_code = CRYS_RND_AddAdditionalInput(p_crys_rnd_state, p_input_data, size);
- ret_val = result_get(err_code);
- if (ret_val != NRF_SUCCESS)
- {
- goto exit;
- }
- }
- err_code = CRYS_RND_Reseeding(p_crys_rnd_state, p_work_buffer);
- ret_val = result_get(err_code);
- exit:
- cc310_backend_mutex_unlock();
- return ret_val;
- }
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_RNG)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO)
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