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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_OPTIGA)
- #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"
- #include "optiga_backend_ecc.h"
- /*lint -save -e????*/
- #include "optiga/optiga_crypt.h"
- /*lint -restore*/
- ret_code_t nrf_crypto_backend_optiga_ecdh_compute(
- void * p_context,
- void const * p_private_key,
- void const * p_public_key,
- uint8_t * p_shared_secret)
- {
- optiga_lib_status_t res = OPTIGA_LIB_ERROR;
- // Prepare public key
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *) p_public_key;
- if (p_pub->oid != NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID)
- {
- // OPTIGA requires the peer' public key to be host-supplied
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- // magic OID for pubkey from host
- public_key_from_host_t pub_key = {
- .public_key = p_pub->raw_pubkey,
- .length = 64+4, // public key + DER BITSTRING header
- .curve = OPTIGA_ECC_NIST_P_256
- };
- // Prepare private key
- nrf_crypto_backend_secp256r1_private_key_t * p_priv =
- (nrf_crypto_backend_secp256r1_private_key_t *) p_private_key;
- optiga_key_id_t priv_oid = p_priv->oid;
- if (priv_oid == NRF_CRYPTO_INFINEON_PRIVKEY_HOST_OID)
- {
- // OPTIGA Trust X can only compute ECDH with private key from inside OPTIGA
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- res = optiga_crypt_ecdh(
- priv_oid, // private key OID
- &pub_key, // peer public key details
- true, // true: export shared secret to host
- p_shared_secret // resulting shared secret
- );
- if (res != OPTIGA_LIB_SUCCESS)
- {
- // error in the optiga library
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- return NRF_SUCCESS;
- }
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
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