text: /**
   * Copyright (c) 2018, Nordic Semiconductor ASA
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   *
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   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
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   *    Semiconductor ASA integrated circuit in a product or a software update for
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   *
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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   *
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
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  #ifndef MBEDTLS_BACKEND_HMAC_H__
  #define MBEDTLS_BACKEND_HMAC_H__
  
  /** @file
   *
   * @defgroup nrf_crypto_mbedtls_backend_hmac mbed TLS backend for HMAC
   * @{
   * @ingroup nrf_crypto_mbedtls_backend
   *
   * @brief Backend wrapper for mbed TLS. None of these types should be used directly by the
   * application.
   */
  
  #include "sdk_common.h"
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS) &&                   \
          ( NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256) || \
            NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512) )
  
  #include "nrf_crypto_hmac_shared.h"
  /*lint -save -e????*/
  #include "mbedtls/md.h"
  #include "mbedtls/sha256.h"
  #include "mbedtls/sha512.h"
  /*lint -restore*/
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #undef  NRF_CRYPTO_HMAC_ENABLED
  #define NRF_CRYPTO_HMAC_ENABLED 1
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256)
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_HMAC_SHA256)
  #error "Duplicate definition of HMAC SHA-256. More than one backend enabled"
  #endif // NRF_CRYPTO_HMAC_SHA256_ENABLED
  #define NRF_CRYPTO_HMAC_SHA256_ENABLED 1
  
  /**
   * @internal @brief Internal context object used by the mbed TLS backend wrapper for HMAC SHA256.
   *
   * @note This should never be used directly. Use @ref nrf_crypto_backend_hmac_sha256_context_t
   * instead.
   */
  typedef struct
  {
      nrf_crypto_hmac_internal_context_t  header;                                         //!< Internal nrf_crypto_hmac context.
      mbedtls_md_context_t                mbedtls_ctx;                                    //!< Mbed TLS context object.
      uint8_t                             md_ctx_buffer[sizeof(mbedtls_sha256_context)];  //!< Message digest buffer for mbed TLS.
      uint16_t                            hmac_ctx_buffer[64];                            //!< Hash buffer for mbed TLS of size defined in mbedtls_sha256_info in md_internal.h.
  } nrf_crypto_backend_mbedtls_hmac_sha256_context_t;
  
  /**
   * @internal @brief Context for HMAC SHA256 using mbed TLS backend.
   */
  typedef nrf_crypto_backend_mbedtls_hmac_sha256_context_t nrf_crypto_backend_hmac_sha256_context_t;
  
  
  #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256)
  
  
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512)
  
  #if NRF_MODULE_ENABLED(NRF_CRYPTO_HMAC_SHA512)
  #error "Duplicate definition of HMAC SHA-512. More than one backend enabled"
  #endif // NRF_CRYPTO_HMAC_SHA512_ENABLED
  #define NRF_CRYPTO_HMAC_SHA512_ENABLED 1
  
  /**
   * @internal @brief Internal context object used by the mbed TLS backend wrapper for HMAC SHA512.
   *
   * @note This should never be used directly. Use @ref nrf_crypto_backend_hmac_sha512_context_t
   * instead.
   */
  typedef struct
  {
      nrf_crypto_hmac_internal_context_t  header;                                         //!< Internal nrf_crypto_hmac context header.
      mbedtls_md_context_t                mbedtls_ctx;                                    //!< Mbed TLS context object.
      uint8_t                             md_ctx_buffer[sizeof(mbedtls_sha512_context)];  //!< Message digest buffer for mbed TLS.
      uint16_t                            hmac_ctx_buffer[128];                           //!< Hash buffer for mbed TLS of size defined in mbedtls_sha512_info in md_internal.h.
  } nrf_crypto_backend_mbedtls_hmac_sha512_context_t;
  
  /**
   * @internal @brief Context for HMAC SHA512 using mbed TLS backend.
   */
  typedef nrf_crypto_backend_mbedtls_hmac_sha512_context_t nrf_crypto_backend_hmac_sha512_context_t;
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512)
  #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS) && ( NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256) || NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512) )
  
  /**@} */
  
  #endif // MBEDTLS_BACKEND_HMAC_H__
  