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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_CC310)
- #include <string.h>
- #include "nrf_crypto_ecc_shared.h"
- #include "nrf_crypto_ecdh_shared.h"
- #include "nrf_crypto_ecdh.h"
- #include "nrf_crypto_mem.h"
- #include "nrf_crypto_shared.h"
- #include "cc310_backend_mutex.h"
- #include "cc310_backend_shared.h"
- #include "cc310_backend_ecdh.h"
- ret_code_t nrf_crypto_backend_cc310_ecdh_compute(
- void * p_context,
- void const * p_private_key,
- void const * p_public_key,
- uint8_t * p_shared_secret)
- {
- ret_code_t result;
- CRYSError_t crys_error;
- uint32_t shared_secret_size;
- uint8_t aligned_buffer[(NRF_CRYPTO_ECDH_SHARED_SECRET_MAX_SIZE + 3) & ~3];
- uint8_t * p_output_buffer;
- bool mutex_locked;
- nrf_crypto_backend_cc310_ecdh_compute_context_t * p_ctx =
- (nrf_crypto_backend_cc310_ecdh_compute_context_t *)p_context;
- nrf_crypto_backend_cc310_ecc_private_key_t * p_prv =
- (nrf_crypto_backend_cc310_ecc_private_key_t *)p_private_key;
- nrf_crypto_backend_cc310_ecc_public_key_t * p_pub =
- (nrf_crypto_backend_cc310_ecc_public_key_t *)p_public_key;
- nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
- result = nrf_crypto_backend_cc310_ecc_public_key_convert(p_pub, &p_ctx->key_build_temp_data);
- if (result != NRF_SUCCESS)
- {
- return result;
- }
- shared_secret_size = p_info->raw_private_key_size;
- if ((shared_secret_size & 3) != 0) // Check if shared_secret_size is word aligned
- {
- shared_secret_size = (shared_secret_size + 3) & ~3;
- p_output_buffer = &aligned_buffer[0];
- }
- else
- {
- p_output_buffer = p_shared_secret;
- }
- mutex_locked = cc310_backend_mutex_trylock();
- if (!mutex_locked)
- {
- return NRF_ERROR_CRYPTO_BUSY;
- }
- crys_error = CRYS_ECDH_SVDP_DH(&p_pub->key.cc310_public_key,
- &p_prv->private_key,
- p_output_buffer,
- &shared_secret_size,
- &p_ctx->temp_data);
- cc310_backend_mutex_unlock();
- if (p_output_buffer != p_shared_secret)
- {
- //lint -save -e645 (Symbol 'aligned_buffer' may not have been initialized)
- memcpy(p_shared_secret,
- &aligned_buffer[3 - ((p_info->raw_private_key_size + 3) & 3)], // Bytes at the beginning that were added during padding are now skipped
- p_info->raw_private_key_size);
- //lint -restore
- }
- result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
- return result;
- }
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
- ret_code_t nrf_crypto_backend_cc310_curve25519_ecdh_compute(
- void * p_context,
- void const * p_private_key,
- void const * p_public_key,
- uint8_t * p_shared_secret)
- {
- ret_code_t result;
- CRYSError_t crys_error;
- bool mutex_locked;
- nrf_crypto_backend_cc310_curve25519_context_t * p_ctx =
- (nrf_crypto_backend_cc310_curve25519_context_t *)p_context;
- nrf_crypto_backend_curve25519_private_key_t * p_prv =
- (nrf_crypto_backend_curve25519_private_key_t *)p_private_key;
- nrf_crypto_backend_curve25519_public_key_t * p_pub =
- (nrf_crypto_backend_curve25519_public_key_t *)p_public_key;
- nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
- size_t shared_secret_size = p_info->raw_private_key_size;
- size_t pub_key_size = sizeof(p_pub->key);
- size_t prv_key_size = sizeof(p_prv->key);
- mutex_locked = cc310_backend_mutex_trylock();
- if (!mutex_locked)
- {
- return NRF_ERROR_CRYPTO_BUSY;
- }
- crys_error = CRYS_ECMONT_Scalarmult(p_shared_secret,
- &shared_secret_size,
- p_prv->key,
- prv_key_size,
- p_pub->key,
- pub_key_size,
- &p_ctx->temp_data);
- cc310_backend_mutex_unlock();
- // Swap endianess (only for Curve25519)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
- nrf_crypto_internal_swap_endian_in_place(p_shared_secret,
- NRF_CRYPTO_ECDH_CURVE25519_SHARED_SECRET_SIZE);
- #endif
- result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
- return result;
- }
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310)
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