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