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