text: /**
   * 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 "oberon_backend_chacha_poly_aead.h"
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_OBERON_CHACHA_POLY_AEAD)
  
  static ret_code_t backend_cc310_init(void * const p_context, uint8_t * p_key)
  {
      nrf_crypto_backend_chacha_poly_context_t * p_ctx =
          (nrf_crypto_backend_chacha_poly_context_t *)p_context;
  
  
      if (p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_256)
      {
          return NRF_ERROR_CRYPTO_KEY_SIZE;
      }
  
      memcpy(p_ctx->key, p_key, sizeof(p_ctx->key));
  
      return NRF_SUCCESS;
  }
  
  static inline ret_code_t backend_cc310_uninit(void * const p_context)
  {
      return NRF_SUCCESS;
  }
  
  static ret_code_t backend_cc310_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;
  
      nrf_crypto_backend_chacha_poly_context_t * p_ctx =
          (nrf_crypto_backend_chacha_poly_context_t *)p_context;
  
      if ((adata_size == 0) || (data_in_size == 0))
      {
          return NRF_ERROR_CRYPTO_INPUT_LENGTH;
      }
  
      if (mac_size   != NRF_CRYPTO_CHACHA_POLY_MAC_SIZE)
      {
          return NRF_ERROR_CRYPTO_AEAD_MAC_SIZE;
      }
  
      if (nonce_size != NRF_CRYPTO_CHACHA_POLY_NONCE_SIZE)
      {
          return NRF_ERROR_CRYPTO_AEAD_NONCE_SIZE;
      }
  
      if (operation == NRF_CRYPTO_ENCRYPT)
      {
          ocrypto_chacha20_poly1305_encrypt_aad(p_mac,
                                                p_data_out,
                                                p_data_in,
                                                data_in_size,
                                                p_adata,
                                                adata_size,
                                                p_nonce,
                                                (size_t)nonce_size,
                                                p_ctx->key);
      }
      else if (operation == NRF_CRYPTO_DECRYPT)
      {
          result = ocrypto_chacha20_poly1305_decrypt_aad(p_mac,
                                                         p_data_out,
                                                         p_data_in,
                                                         data_in_size,
                                                         p_adata,
                                                         adata_size,
                                                         p_nonce,
                                                         (size_t)nonce_size,
                                                         p_ctx->key);
  
          if (result != 0)
          {
              return NRF_ERROR_CRYPTO_AEAD_INVALID_MAC;
          }
      }
      else
      {
          return NRF_ERROR_CRYPTO_INVALID_PARAM;
      }
  
      return NRF_SUCCESS;
  }
  
  nrf_crypto_aead_info_t const g_nrf_crypto_chacha_poly_256_info =
  {
      .key_size  = NRF_CRYPTO_KEY_SIZE_256,
      .mode      = NRF_CRYPTO_AEAD_MODE_CHACHA_POLY,
  
      .init_fn   = backend_cc310_init,
      .uninit_fn = backend_cc310_uninit,
      .crypt_fn  = backend_cc310_crypt
  };
  
  
  #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_CC310_CHACHA_POLY_AEAD)
  #endif // NRF_MODULE_ENABLED(NRF_CRYPTO)
  
  