text: /**
   * Copyright (c) 2018 - 2019, Nordic Semiconductor ASA
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   * 4. This software, with or without modification, must only be used with a
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  #ifndef NRF_CRYPTO_AEAD_BACKEND_H__
  #define NRF_CRYPTO_AEAD_BACKEND_H__
  
  #include "cc310_backend_aes_aead.h"
  #include "cc310_backend_chacha_poly_aead.h"
  #include "cifra_backend_aes_aead.h"
  #include "mbedtls_backend_aes_aead.h"
  #include "oberon_backend_chacha_poly_aead.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**@internal @brief Fallback type for AES CCM context (if no backend is enabled).
   */
  #if !NRF_MODULE_ENABLED(NRF_CRYPTO_AES_CCM)
  typedef nrf_crypto_aead_internal_context_t nrf_crypto_backend_aes_ccm_context_t;
  #endif
  
  /**@internal @brief Fallback type for AES CCM* context (if no backend is enabled).
   */
  #if !NRF_MODULE_ENABLED(NRF_CRYPTO_AES_CCM_STAR)
  typedef nrf_crypto_aead_internal_context_t nrf_crypto_backend_aes_ccm_star_context_t;
  #endif
  
  /**@internal @brief Fallback type for AES EAX context (if no backend is enabled).
   */
  #if !NRF_MODULE_ENABLED(NRF_CRYPTO_AES_EAX)
  typedef nrf_crypto_aead_internal_context_t nrf_crypto_backend_aes_eax_context_t;
  #endif
  
  /**@internal @brief Fallback type for AES GCM context (if no backend is enabled).
   */
  #if !NRF_MODULE_ENABLED(NRF_CRYPTO_AES_GCM)
  typedef nrf_crypto_aead_internal_context_t nrf_crypto_backend_aes_gcm_context_t;
  #endif
  
  /**@internal @brief Fallback type for CHACHA-POLY context (if no backend is enabled).
   */
  #if !NRF_MODULE_ENABLED(NRF_CRYPTO_CHACHA_POLY)
  typedef nrf_crypto_aead_internal_context_t nrf_crypto_backend_chacha_poly_context_t;
  #endif
  
  /** @internal @brief Union holding a AEAD context. */
  typedef union
  {
      nrf_crypto_backend_aes_ccm_context_t      ccm_context;          /**< @brief Holds context for AES CCM. */
      nrf_crypto_backend_aes_ccm_star_context_t ccm_star_context;     /**< @brief Holds context for AES CCM*. */
      nrf_crypto_backend_aes_eax_context_t      eax_context;          /**< @brief Holds context for AES EAX. */
      nrf_crypto_backend_aes_gcm_context_t      gcm_context;          /**< @brief Holds context for AES GCM. */
  
      nrf_crypto_backend_chacha_poly_context_t  chacha_poly_context;  /**< @brief Holds context for ChaCha-Poly. */
  } nrf_crypto_backend_aead_context_t;
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // NRF_CRYPTO_AEAD_BACKEND_H__
  