owner-nrf52sdk/nRF5_SDK_15.3.0/components/libraries/crypto/nrf_crypto_hmac_backend.h

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#ifndef NRF_CRYPTO_HMAC_BACKEND_H__
#define NRF_CRYPTO_HMAC_BACKEND_H__

/** @file
 *
 * @defgroup nrf_crypto_hmac_backend Meta backend.
 * @{
 * @ingroup nrf_crypto_hmac
 *
 * @brief Includes all backends definitions.
 *
 * @details This file includes all backend definitions, and provide a dummy context in case no
 * backend is enabled. This is needed so that any project including HMAC headers will still
 * compile when HMAC is not used/enabled.
 */

#include "sdk_common.h"
#include "nrf_crypto_hmac_shared.h"
#include "mbedtls_backend_hmac.h"
#include "cc310_backend_hmac.h"
#include "oberon_backend_hmac.h"

#ifdef __cplusplus
extern "C" {
#endif


#ifndef NRF_CRYPTO_HMAC_SHA256_ENABLED
// /** @internal @brief Fallback context type for HMAC SHA256 in case no backend is selected. */
typedef nrf_crypto_hmac_internal_context_t nrf_crypto_backend_hmac_sha256_context_t;
#endif // #ifndef NRF_CRYPTO_HMAC_SHA256_ENABLED

#ifndef NRF_CRYPTO_HMAC_SHA512_ENABLED
/** @internal @brief Fallback context type for HMAC SHA512 in case no backend is selected. */
typedef nrf_crypto_hmac_internal_context_t nrf_crypto_backend_hmac_sha512_context_t;
#endif // #ifndef NRF_CRYPTO_HMAC_SHA512_ENABLED


/** @internal @brief Union holding a HMAC context. */
typedef union
{
    nrf_crypto_backend_hmac_sha256_context_t hmac_sha256_context;   /**< @brief Holds context for HMAC SHA-256. */
    nrf_crypto_backend_hmac_sha512_context_t hmac_sha512_context;   /**< @brief Holds context for HMAC SHA-512. */
} nrf_crypto_backend_hmac_context_t;


#ifdef __cplusplus
}
#endif

/**@} */

#endif // NRF_CRYPTO_HMAC_BACKEND_H__