204 lines
8.0 KiB
C
204 lines
8.0 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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#include "stddef.h"
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#include "nrf_log.h"
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#include "nrf_crypto_hmac.h"
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#include "nrf_crypto_hmac_shared.h"
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#include "nrf_crypto_error.h"
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#include "nrf_crypto_init.h"
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#include "nrf_crypto_mem.h"
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#include "nrf_crypto_shared.h"
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_HMAC)
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// Magic word that is set when initializing the context and checked by functions that use it.
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#define NRF_CRYPTO_HMAC_INIT_MAGIC_VALUE 0xBADEBA11
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static ret_code_t verify_context_valid(nrf_crypto_hmac_internal_context_t * const p_context)
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{
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if (p_context == NULL)
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{
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return NRF_ERROR_CRYPTO_CONTEXT_NULL;
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}
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else if (p_context->init_value != NRF_CRYPTO_HMAC_INIT_MAGIC_VALUE)
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{
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return NRF_ERROR_CRYPTO_CONTEXT_NOT_INITIALIZED;
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}
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else
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{
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return NRF_SUCCESS;
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}
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}
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ret_code_t nrf_crypto_hmac_init(nrf_crypto_hmac_context_t * const p_context,
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nrf_crypto_hmac_info_t const * p_info,
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uint8_t const * p_key,
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size_t key_size)
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{
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ret_code_t err_code;
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nrf_crypto_hmac_internal_context_t * p_ctx = (nrf_crypto_hmac_internal_context_t *)p_context;
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VERIFY_TRUE(nrf_crypto_is_initialized(), NRF_ERROR_CRYPTO_NOT_INITIALIZED);
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// Validate input
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VERIFY_TRUE(p_ctx != NULL, NRF_ERROR_CRYPTO_CONTEXT_NULL);
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VERIFY_TRUE(p_info != NULL, NRF_ERROR_CRYPTO_INPUT_NULL);
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VERIFY_TRUE(p_key != NULL, NRF_ERROR_CRYPTO_INPUT_NULL);
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VERIFY_TRUE(key_size > 0, NRF_ERROR_CRYPTO_INPUT_LENGTH);
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// Initialize generic part of the context
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p_ctx->p_info = p_info;
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// Do backend specific initialization by calling the backend init function pointed
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// to in the configuration struct in the context (nrf_crypto_hmac_config_t)
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err_code = p_ctx->p_info->init_fn(p_context, p_key, key_size);
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if (err_code == NRF_SUCCESS)
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{
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p_ctx->init_value = NRF_CRYPTO_HMAC_INIT_MAGIC_VALUE;
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}
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return err_code;
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}
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ret_code_t nrf_crypto_hmac_update(nrf_crypto_hmac_context_t * const p_context,
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uint8_t const * p_data,
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size_t data_size)
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{
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ret_code_t err_code;
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// The context header by definition has to be the first element of the context struct.
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nrf_crypto_hmac_internal_context_t * p_ctx = (nrf_crypto_hmac_internal_context_t *)p_context;
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// Validate input
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err_code = verify_context_valid(p_ctx);
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VERIFY_SUCCESS(err_code);
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VERIFY_TRUE(p_data != NULL, NRF_ERROR_CRYPTO_INPUT_NULL);
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VERIFY_TRUE(data_size > 0, NRF_ERROR_CRYPTO_INPUT_LENGTH);
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// Call backend specific update function (pointed to by config struct in context)
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err_code = p_ctx->p_info->update_fn(p_context, p_data, data_size);
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return err_code;
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}
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ret_code_t nrf_crypto_hmac_finalize(nrf_crypto_hmac_context_t * const p_context,
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uint8_t * p_digest,
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size_t * const p_digest_size)
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{
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ret_code_t err_code;
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// The context header by definition has to be the first element of the context struct.
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nrf_crypto_hmac_internal_context_t * p_ctx = (nrf_crypto_hmac_internal_context_t *)p_context;
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// Validate input
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err_code = verify_context_valid(p_ctx);
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VERIFY_SUCCESS(err_code);
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VERIFY_TRUE(p_digest != NULL, NRF_ERROR_CRYPTO_OUTPUT_NULL);
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VERIFY_TRUE(*p_digest_size >= p_ctx->p_info->digest_size, NRF_ERROR_CRYPTO_OUTPUT_LENGTH);
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// Call backend specific finish function (pointed to by config struct in context)
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err_code = p_ctx->p_info->finalize_fn(p_context, p_digest, p_digest_size);
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return err_code;
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}
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ret_code_t nrf_crypto_hmac_calculate(nrf_crypto_hmac_context_t * const p_context,
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nrf_crypto_hmac_info_t const * p_info,
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uint8_t * p_digest,
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size_t * const p_digest_size,
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uint8_t const * p_key,
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size_t key_size,
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uint8_t const * p_data,
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size_t data_size)
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{
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ret_code_t err_code;
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nrf_crypto_hmac_context_t * p_ctx;
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void * p_allocated_context = NULL;
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// Validate input. Only validate input parameters that are used locally, others are validated
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// in the init, update and/or finalize functions.
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VERIFY_TRUE(p_info != NULL, NRF_ERROR_CRYPTO_INPUT_NULL);
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// Allocate context if needed (not provided by the user).
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if (p_context == NULL)
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{
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p_allocated_context = NRF_CRYPTO_ALLOC(p_info->context_size);
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if (p_allocated_context == NULL)
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{
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return NRF_ERROR_CRYPTO_ALLOC_FAILED;
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}
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p_ctx = (nrf_crypto_hmac_context_t *)p_allocated_context;
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}
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else
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{
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p_ctx = (nrf_crypto_hmac_context_t *)p_context;
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}
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// Perform integrated HMAC calculation by caling the frontend functions defined in this file
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err_code = nrf_crypto_hmac_init(p_ctx, p_info, p_key, key_size);
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NRF_CRYPTO_VERIFY_SUCCESS_DEALLOCATE(err_code, p_allocated_context);
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err_code = nrf_crypto_hmac_update(p_ctx, p_data, data_size);
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NRF_CRYPTO_VERIFY_SUCCESS_DEALLOCATE(err_code, p_allocated_context);
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err_code = nrf_crypto_hmac_finalize(p_ctx, p_digest, p_digest_size);
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NRF_CRYPTO_VERIFY_SUCCESS_DEALLOCATE(err_code, p_allocated_context);
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// Free context if allocated internally
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if (p_allocated_context != NULL)
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{
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NRF_CRYPTO_FREE(p_allocated_context);
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}
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return err_code;
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}
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_HMAC)
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO)
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