125 lines
4.4 KiB
C
125 lines
4.4 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_config.h"
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#include "nordic_common.h"
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#if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)
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#include <string.h>
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#include "nrf_crypto_ecc_shared.h"
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#include "nrf_crypto_ecdh_shared.h"
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#include "nrf_crypto_shared.h"
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#include "nrf_crypto_ecdh.h"
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/*lint -save -e????*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "mbedtls/ecp.h"
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#include "mbedtls/ecdh.h"
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/*lint -restore*/
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ret_code_t nrf_crypto_backend_mbedtls_ecdh_compute(
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void * p_context,
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void const * p_private_key,
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void const * p_public_key,
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uint8_t * p_shared_secret)
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{
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int result;
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mbedtls_mpi shared_secret_mpi;
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mbedtls_ecp_group group;
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nrf_crypto_backend_mbedtls_ecc_private_key_t const * p_prv =
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(nrf_crypto_backend_mbedtls_ecc_private_key_t const *)p_private_key;
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nrf_crypto_backend_mbedtls_ecc_public_key_t const * p_pub =
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(nrf_crypto_backend_mbedtls_ecc_public_key_t const *)p_public_key;
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nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
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if (!nrf_crypto_backend_mbedtls_ecc_group_load(&group, p_info))
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{
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return NRF_ERROR_CRYPTO_INTERNAL;
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}
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mbedtls_mpi_init(&shared_secret_mpi);
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result = mbedtls_ecdh_compute_shared(&group,
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&shared_secret_mpi,
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&p_pub->key,
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&p_prv->key,
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nrf_crypto_backend_mbedtls_ecc_mbedtls_rng,
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NULL);
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if (result == 0)
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{
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result = mbedtls_mpi_write_binary(&shared_secret_mpi,
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p_shared_secret,
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p_info->raw_private_key_size);
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}
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#if NRF_CRYPTO_ECC_CURVE25519_ENABLED && !NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
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if (p_info == &g_nrf_crypto_ecc_curve25519_curve_info)
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{
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nrf_crypto_internal_swap_endian_in_place(p_shared_secret,
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NRF_CRYPTO_ECDH_CURVE25519_SHARED_SECRET_SIZE);
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}
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#endif
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mbedtls_mpi_free(&shared_secret_mpi);
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mbedtls_ecp_group_free(&group);
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if (result != 0)
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{
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return NRF_ERROR_CRYPTO_INTERNAL;
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}
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return NRF_SUCCESS;
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}
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)
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