| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120 | /** * 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_OBERON) && \    NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)#include <stdint.h>#include <stdbool.h>#include <string.h>#include "nrf_crypto_ecc.h"#include "nrf_crypto_rng.h"#include "nrf_crypto_ecdsa.h"#include "oberon_backend_eddsa.h"#include "nrf_crypto_eddsa_shared.h"#include "ocrypto_ecdsa_p256.h"#define OBERON_HASH_SIZE_FOR_SECP256R1 (256 / 8)ret_code_t nrf_crypto_backend_secp256r1_sign(    void          * p_context,    void    const * p_private_key,    uint8_t const * p_data,    size_t          data_size,    uint8_t       * p_signature){    int     result;    uint8_t session_key[32];    nrf_crypto_backend_secp256r1_private_key_t const * p_prv =        (nrf_crypto_backend_secp256r1_private_key_t const *)p_private_key;    if (data_size < OBERON_HASH_SIZE_FOR_SECP256R1)    {        return NRF_ERROR_CRYPTO_INPUT_LENGTH;    }    result = nrf_crypto_backend_oberon_ecc_secp256r1_rng(session_key);    if (result != NRF_SUCCESS)    {        return result;    }    result = ocrypto_ecdsa_p256_sign_hash(p_signature, p_data, p_prv->key, session_key);    return result == 0 ? NRF_SUCCESS : NRF_ERROR_CRYPTO_INTERNAL;}ret_code_t nrf_crypto_backend_secp256r1_verify(    void          * p_context,    void    const * p_public_key,    uint8_t const * p_data,    size_t          data_size,    uint8_t const * p_signature){    int result;    nrf_crypto_backend_secp256r1_public_key_t const * p_pub =        (nrf_crypto_backend_secp256r1_public_key_t const *)p_public_key;    if (data_size < OBERON_HASH_SIZE_FOR_SECP256R1)    {        return NRF_ERROR_CRYPTO_INPUT_LENGTH;    }    result = ocrypto_ecdsa_p256_verify_hash(p_signature, p_data, p_pub->key);    if (result != 0)    {        return NRF_ERROR_CRYPTO_ECDSA_INVALID_SIGNATURE;    }    return NRF_SUCCESS;}#endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
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