206 lines
6.9 KiB
C
206 lines
6.9 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_common.h"
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#if NRF_MODULE_ENABLED(NRF_CRYPTO)
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#include <stdbool.h>
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#include "cifra_backend_aes_aead.h"
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_CIFRA_AES_AEAD)
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/**@internal @brief Type declaration of a template matching all possible context sizes
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* for this backend.
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*/
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typedef struct
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{
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nrf_crypto_aead_internal_context_t header; /**< Common header for context. */
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cf_aes_context context;
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} nrf_crypto_backend_cifra_aes_aead_context_t;
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static ret_code_t result_get(int error)
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{
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switch (error)
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{
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case 0:
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return NRF_SUCCESS;
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case 1:
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return NRF_ERROR_CRYPTO_AEAD_INVALID_MAC;
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default:
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return NRF_ERROR_CRYPTO_INTERNAL;
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}
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}
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static ret_code_t backend_cifra_init(void * const p_context, uint8_t * p_key)
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{
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nrf_crypto_backend_cifra_aes_aead_context_t * p_ctx =
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(nrf_crypto_backend_cifra_aes_aead_context_t *)p_context;
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if ((p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_128) &&
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(p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_192) &&
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(p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_256))
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{
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return NRF_ERROR_CRYPTO_KEY_SIZE;
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}
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VERIFY_TRUE((p_ctx->header.p_info->mode == NRF_CRYPTO_AEAD_MODE_AES_EAX),
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NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE);
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cf_aes_init(&p_ctx->context,
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p_key,
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(p_ctx->header.p_info->key_size)>>3); // >>3: changes bits to bytes
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return NRF_SUCCESS;
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}
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static ret_code_t backend_cifra_uninit(void * const p_context)
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{
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nrf_crypto_backend_cifra_aes_aead_context_t * p_ctx =
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(nrf_crypto_backend_cifra_aes_aead_context_t *)p_context;
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cf_aes_finish(&p_ctx->context);
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return NRF_SUCCESS;
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}
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static ret_code_t backend_cifra_crypt(void * const p_context,
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nrf_crypto_operation_t operation,
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uint8_t * p_nonce,
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uint8_t nonce_size,
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uint8_t * p_adata,
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size_t adata_size,
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uint8_t * p_data_in,
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size_t data_in_size,
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uint8_t * p_data_out,
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uint8_t * p_mac,
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uint8_t mac_size)
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{
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int result;
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ret_code_t ret_val;
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nrf_crypto_backend_cifra_aes_aead_context_t * p_ctx =
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(nrf_crypto_backend_cifra_aes_aead_context_t *)p_context;
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ret_val = NRF_SUCCESS;
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/* EAX mode allows following mac size: [1 ... 16] */
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if ((mac_size < 1) || (mac_size > NRF_CRYPTO_AES_BLOCK_SIZE))
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{
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return NRF_ERROR_CRYPTO_AEAD_MAC_SIZE;
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}
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if (operation == NRF_CRYPTO_ENCRYPT)
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{
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cf_eax_encrypt(&cf_aes,
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&p_ctx->context,
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p_data_in,
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data_in_size,
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p_adata,
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adata_size,
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p_nonce,
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(size_t)nonce_size,
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p_data_out,
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p_mac,
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mac_size);
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}
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else if (operation == NRF_CRYPTO_DECRYPT)
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{
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result = cf_eax_decrypt(&cf_aes,
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&p_ctx->context,
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p_data_in,
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data_in_size,
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p_adata,
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adata_size,
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p_nonce,
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(size_t)nonce_size,
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p_mac,
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mac_size,
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p_data_out);
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ret_val = result_get(result);
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}
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else
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{
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return NRF_ERROR_CRYPTO_INVALID_PARAM;
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}
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return ret_val;
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}
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#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CIFRA_AES_EAX)
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nrf_crypto_aead_info_t const g_nrf_crypto_aes_eax_128_info =
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{
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.key_size = NRF_CRYPTO_KEY_SIZE_128,
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.mode = NRF_CRYPTO_AEAD_MODE_AES_EAX,
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.init_fn = backend_cifra_init,
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.uninit_fn = backend_cifra_uninit,
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.crypt_fn = backend_cifra_crypt
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};
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nrf_crypto_aead_info_t const g_nrf_crypto_aes_eax_192_info =
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{
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.key_size = NRF_CRYPTO_KEY_SIZE_192,
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.mode = NRF_CRYPTO_AEAD_MODE_AES_EAX,
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.init_fn = backend_cifra_init,
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.uninit_fn = backend_cifra_uninit,
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.crypt_fn = backend_cifra_crypt
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};
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nrf_crypto_aead_info_t const g_nrf_crypto_aes_eax_256_info =
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{
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.key_size = NRF_CRYPTO_KEY_SIZE_256,
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.mode = NRF_CRYPTO_AEAD_MODE_AES_EAX,
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.init_fn = backend_cifra_init,
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.uninit_fn = backend_cifra_uninit,
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.crypt_fn = backend_cifra_crypt
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};
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#endif
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#endif // MODULE_ENABLED(NRF_CRYPTO_AES_CCM_BACKEND_MBEDTLS)
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#endif // MODULE_ENABLED(NRF_CRYPTO)
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