184 lines
6.7 KiB
C
184 lines
6.7 KiB
C
/**
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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_CC310)
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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_ecdh.h"
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#include "nrf_crypto_mem.h"
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#include "nrf_crypto_shared.h"
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#include "cc310_backend_mutex.h"
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#include "cc310_backend_shared.h"
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#include "cc310_backend_ecdh.h"
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ret_code_t nrf_crypto_backend_cc310_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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ret_code_t result;
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CRYSError_t crys_error;
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uint32_t shared_secret_size;
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uint8_t aligned_buffer[(NRF_CRYPTO_ECDH_SHARED_SECRET_MAX_SIZE + 3) & ~3];
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uint8_t * p_output_buffer;
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bool mutex_locked;
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nrf_crypto_backend_cc310_ecdh_compute_context_t * p_ctx =
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(nrf_crypto_backend_cc310_ecdh_compute_context_t *)p_context;
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nrf_crypto_backend_cc310_ecc_private_key_t * p_prv =
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(nrf_crypto_backend_cc310_ecc_private_key_t *)p_private_key;
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nrf_crypto_backend_cc310_ecc_public_key_t * p_pub =
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(nrf_crypto_backend_cc310_ecc_public_key_t *)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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result = nrf_crypto_backend_cc310_ecc_public_key_convert(p_pub, &p_ctx->key_build_temp_data);
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if (result != NRF_SUCCESS)
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{
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return result;
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}
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shared_secret_size = p_info->raw_private_key_size;
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if ((shared_secret_size & 3) != 0) // Check if shared_secret_size is word aligned
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{
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shared_secret_size = (shared_secret_size + 3) & ~3;
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p_output_buffer = &aligned_buffer[0];
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}
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else
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{
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p_output_buffer = p_shared_secret;
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}
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mutex_locked = cc310_backend_mutex_trylock();
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if (!mutex_locked)
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{
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return NRF_ERROR_CRYPTO_BUSY;
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}
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crys_error = CRYS_ECDH_SVDP_DH(&p_pub->key.cc310_public_key,
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&p_prv->private_key,
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p_output_buffer,
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&shared_secret_size,
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&p_ctx->temp_data);
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cc310_backend_mutex_unlock();
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if (p_output_buffer != p_shared_secret)
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{
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//lint -save -e645 (Symbol 'aligned_buffer' may not have been initialized)
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memcpy(p_shared_secret,
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&aligned_buffer[3 - ((p_info->raw_private_key_size + 3) & 3)], // Bytes at the beginning that were added during padding are now skipped
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p_info->raw_private_key_size);
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//lint -restore
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}
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result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
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return result;
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}
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
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ret_code_t nrf_crypto_backend_cc310_curve25519_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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ret_code_t result;
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CRYSError_t crys_error;
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bool mutex_locked;
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nrf_crypto_backend_cc310_curve25519_context_t * p_ctx =
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(nrf_crypto_backend_cc310_curve25519_context_t *)p_context;
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nrf_crypto_backend_curve25519_private_key_t * p_prv =
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(nrf_crypto_backend_curve25519_private_key_t *)p_private_key;
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nrf_crypto_backend_curve25519_public_key_t * p_pub =
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(nrf_crypto_backend_curve25519_public_key_t *)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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size_t shared_secret_size = p_info->raw_private_key_size;
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size_t pub_key_size = sizeof(p_pub->key);
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size_t prv_key_size = sizeof(p_prv->key);
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mutex_locked = cc310_backend_mutex_trylock();
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if (!mutex_locked)
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{
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return NRF_ERROR_CRYPTO_BUSY;
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}
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crys_error = CRYS_ECMONT_Scalarmult(p_shared_secret,
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&shared_secret_size,
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p_prv->key,
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prv_key_size,
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p_pub->key,
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pub_key_size,
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&p_ctx->temp_data);
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cc310_backend_mutex_unlock();
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// Swap endianess (only for Curve25519)
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
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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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#endif
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result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
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return result;
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}
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
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#endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310)
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