/** * 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" #include #if NRF_MODULE_ENABLED(NRF_CRYPTO) #include "nrf_crypto_error.h" #include "mbedtls_backend_aes_aead.h" #if NRF_MODULE_ENABLED(NRF_CRYPTO_MBEDTLS_AES_AEAD) /**@internal @brief Type declaration of a template suiting all possible context sizes * for this backend. */ typedef union { nrf_crypto_aead_internal_context_t header; /**< Common header for context. */ #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) nrf_crypto_backend_aes_ccm_context_t ccm; #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) nrf_crypto_backend_aes_gcm_context_t gcm; #endif } nrf_crypto_backend_mbedtls_aes_aead_context_t; static ret_code_t result_get(int error) { ret_code_t ret_val; switch (error) { case 0: ret_val = NRF_SUCCESS; break; case MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA: ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH; break; case MBEDTLS_ERR_CIPHER_ALLOC_FAILED: ret_val = NRF_ERROR_CRYPTO_ALLOC_FAILED; break; case MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE: ret_val = NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE; break; #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) case MBEDTLS_ERR_CCM_BAD_INPUT: ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM; break; case MBEDTLS_ERR_CCM_AUTH_FAILED: ret_val = NRF_ERROR_CRYPTO_AEAD_INVALID_MAC; break; #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) case MBEDTLS_ERR_GCM_BAD_INPUT: ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM; break; case MBEDTLS_ERR_GCM_AUTH_FAILED: ret_val = NRF_ERROR_CRYPTO_AEAD_INVALID_MAC; break; #endif default: ret_val = NRF_ERROR_CRYPTO_INTERNAL; break; } return ret_val; } static ret_code_t backend_mbedtls_init(void * const p_context, uint8_t * p_key) { int result; ret_code_t ret_val; nrf_crypto_backend_mbedtls_aes_aead_context_t * p_ctx = (nrf_crypto_backend_mbedtls_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; } switch (p_ctx->header.p_info->mode) { #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) case NRF_CRYPTO_AEAD_MODE_AES_CCM: mbedtls_ccm_init(&p_ctx->ccm.context); result = mbedtls_ccm_setkey(&p_ctx->ccm.context, MBEDTLS_CIPHER_ID_AES, p_key, p_ctx->header.p_info->key_size); break; #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) case NRF_CRYPTO_AEAD_MODE_AES_GCM: mbedtls_gcm_init(&p_ctx->gcm.context); result = mbedtls_gcm_setkey(&p_ctx->gcm.context, MBEDTLS_CIPHER_ID_AES, p_key, p_ctx->header.p_info->key_size); break; #endif default: return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE; } if (result != 0) { ret_val = result_get(result); return ret_val; } return NRF_SUCCESS; } static ret_code_t backend_mbedtls_uninit(void * const p_context) { nrf_crypto_backend_mbedtls_aes_aead_context_t * p_ctx = (nrf_crypto_backend_mbedtls_aes_aead_context_t *)p_context; if (p_ctx->header.p_info->mode == NRF_CRYPTO_AEAD_MODE_AES_CCM) { #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) mbedtls_ccm_free(&p_ctx->ccm.context); #endif } else { #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) mbedtls_gcm_free(&p_ctx->gcm.context); #endif } return NRF_SUCCESS; } #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) static ret_code_t backend_mbedtls_ccm_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_mbedtls_aes_aead_context_t * p_ctx = (nrf_crypto_backend_mbedtls_aes_aead_context_t *)p_context; /* CCM mode allows following MAC sizes: [4, 6, 8, 10, 12, 14, 16] */ if ((mac_size < NRF_CRYPTO_AES_CCM_MAC_MIN) || (mac_size > NRF_CRYPTO_AES_CCM_MAC_MAX) || ((mac_size & 0x01) != 0)) { return NRF_ERROR_CRYPTO_AEAD_MAC_SIZE; } if ((nonce_size < NRF_CRYPTO_AES_CCM_NONCE_SIZE_MIN) || (nonce_size > NRF_CRYPTO_AES_CCM_NONCE_SIZE_MAX)) { return NRF_ERROR_CRYPTO_AEAD_NONCE_SIZE; } if (operation == NRF_CRYPTO_ENCRYPT) { result = mbedtls_ccm_encrypt_and_tag(&p_ctx->ccm.context, data_in_size, p_nonce, nonce_size, p_adata, adata_size, p_data_in, p_data_out, p_mac, (size_t)mac_size); } else if (operation == NRF_CRYPTO_DECRYPT) { result = mbedtls_ccm_auth_decrypt(&p_ctx->ccm.context, data_in_size, p_nonce, nonce_size, p_adata, adata_size, p_data_in, p_data_out, p_mac, (size_t)mac_size); } else { return NRF_ERROR_CRYPTO_INVALID_PARAM; } ret_val = result_get(result); return ret_val; } #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) static ret_code_t backend_mbedtls_gcm_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_mbedtls_aes_aead_context_t * p_ctx = (nrf_crypto_backend_mbedtls_aes_aead_context_t *)p_context; /* GCM allows following MAC size: [4 ... 16] */ if ((mac_size < NRF_CRYPTO_AES_GCM_MAC_MIN) || (mac_size > NRF_CRYPTO_AES_GCM_MAC_MAX)) { return NRF_ERROR_CRYPTO_AEAD_MAC_SIZE; } if (operation == NRF_CRYPTO_ENCRYPT) { result = mbedtls_gcm_crypt_and_tag(&p_ctx->gcm.context, MBEDTLS_GCM_ENCRYPT, data_in_size, p_nonce, nonce_size, p_adata, adata_size, p_data_in, p_data_out, (size_t)mac_size, p_mac); ret_val = result_get(result); } else if (operation == NRF_CRYPTO_DECRYPT) { result = mbedtls_gcm_auth_decrypt(&p_ctx->gcm.context, data_in_size, p_nonce, nonce_size, p_adata, adata_size, p_mac, (size_t)mac_size, p_data_in, p_data_out); ret_val = result_get(result); } else { return NRF_ERROR_CRYPTO_INVALID_PARAM; } return ret_val; } #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_CCM) nrf_crypto_aead_info_t const g_nrf_crypto_aes_ccm_128_info = { .key_size = NRF_CRYPTO_KEY_SIZE_128, .mode = NRF_CRYPTO_AEAD_MODE_AES_CCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_ccm_crypt }; nrf_crypto_aead_info_t const g_nrf_crypto_aes_ccm_192_info = { .key_size = NRF_CRYPTO_KEY_SIZE_192, .mode = NRF_CRYPTO_AEAD_MODE_AES_CCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_ccm_crypt }; nrf_crypto_aead_info_t const g_nrf_crypto_aes_ccm_256_info = { .key_size = NRF_CRYPTO_KEY_SIZE_256, .mode = NRF_CRYPTO_AEAD_MODE_AES_CCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_ccm_crypt }; #endif #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_AES_GCM) nrf_crypto_aead_info_t const g_nrf_crypto_aes_gcm_128_info = { .key_size = NRF_CRYPTO_KEY_SIZE_128, .mode = NRF_CRYPTO_AEAD_MODE_AES_GCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_gcm_crypt }; nrf_crypto_aead_info_t const g_nrf_crypto_aes_gcm_192_info = { .key_size = NRF_CRYPTO_KEY_SIZE_192, .mode = NRF_CRYPTO_AEAD_MODE_AES_GCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_gcm_crypt }; nrf_crypto_aead_info_t const g_nrf_crypto_aes_gcm_256_info = { .key_size = NRF_CRYPTO_KEY_SIZE_256, .mode = NRF_CRYPTO_AEAD_MODE_AES_GCM, .init_fn = backend_mbedtls_init, .uninit_fn = backend_mbedtls_uninit, .crypt_fn = backend_mbedtls_gcm_crypt }; #endif #endif // MODULE_ENABLED(NRF_CRYPTO_MBEDTLS_AES_AEAD) #endif // MODULE_ENABLED(NRF_CRYPTO)