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