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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. * */ #ifndef NRF_CRYPTO_HKDF_H__ #define NRF_CRYPTO_HKDF_H__ /** @file * * @defgroup nrf_crypto_hkdf HMAC based Key Derivation Function (HKDF) related functions * @{ * @ingroup nrf_crypto * * @brief Provides functions to generate HMAC based Key Derivation Function (HKDF). * * @details Provides functions to generate HMAC based Key Derivation Function (HKDF) using * one of the supported hash algorithms. This layer is independent of backend crypto library. * The HKDF module does not have a backend configuration, as it uses the nrf_crypto_hmac API, * including the backend configured for HMAC in @ref sdk_config. */ #include #include "sdk_common.h" #include "nrf_crypto_hmac.h" #include "nrf_crypto_hkdf.h" #include "nrf_crypto_types.h" #ifdef __cplusplus extern "C" { #endif /** * @brief Enumeration of HKDF modes. */ typedef enum { NRF_CRYPTO_HKDF_EXTRACT_AND_EXPAND, //!< HKDF Extract and expand mode (normal). NRF_CRYPTO_HKDF_EXPAND_ONLY //!< HKDF Expand only mode. } nrf_crypto_hkdf_mode_t; /** * @brief Integrated HKDF calculation function * * @details This HKDF calculation function uses the nrf_crypto HMAC frontend directly. * The backend is selected by configuring the HMAC backend in @ref sdk_config. * * @param[in,out] p_context Pointer to context structure. Context memory will be * allocated internally if the context pointer is NULL. * @param[in] p_info Pointer to static info structure. This defines the algorithm. * This should be either @ref g_nrf_crypto_hmac_sha256_info or * @ref g_nrf_crypto_hmac_sha512_info. * @param[out] p_output_key Pointer to buffer to hold the output key material. * @param[in,out] p_output_key_size Pointer to the length of the wanted output key material as input * and actual length of the output material as output. Can be any * number between 1 and the hash digest size multiplied by 255 * (65280 for SHA-256 or 130560 for SHA-512). The p_output_key * buffer must be large enough to hold this value. * @param[in] p_input_key Pointer to buffer holding the input key material. * @param[in] input_key_size Length of the input key material. * @param[in] p_salt Pointer to buffer of nonsecret random salt data. Set to NULL in * order to use the default salt defined by RFC 5869 (all zero * array of hash digest size) or if salt is not used (expand only). * @param[in] salt_size Length of the salt. Must be > 0 unless default salt is used, or * in case mode is set to @ref NRF_CRYPTO_HKDF_EXPAND_ONLY. * @param[in] p_ainfo Pointer to optional application specific information. * (set to NULL and set ainfo_size to 0 if unused). * @param[in] ainfo_size Length of the additional information. * @param[in] mode Set to @ref NRF_CRYPTO_HKDF_EXTRACT_AND_EXPAND for normal mode. * Alternatively, set to @ref NRF_CRYPTO_HKDF_EXPAND_ONLY to skip * the extraction step. * * @retval NRF_SUCCESS Output key material hash was successfully calculated. * @retval NRF_ERROR_CRYPTO_INPUT_NULL If p_input_key was NULL. * @retval NRF_ERROR_CRYPTO_INPUT_LENGTH If input_key_size or salt_size was invalid. * @retval NRF_ERROR_CRYPTO_OUTPUT_NULL If p_output_key_sizen was NULL. * @retval NRF_ERROR_CRYPTO_OUTPUT_LENGTH If *p_output_key_size is 0. * @retval NRF_ERROR_CRYPTO_ALLOC_FAILED Unable to allocate memory for the context. * @retval NRF_ERROR_CRYPTO_INTERNAL An error occurred in the crypto backend. * @retval NRF_ERROR_CRYPTO_BUSY The function could not be called because the * nrf_crypto backend was busy. Please rerun the * cryptographic routine at a later time. CC310 only. */ ret_code_t nrf_crypto_hkdf_calculate(nrf_crypto_hmac_context_t * const p_context, nrf_crypto_hmac_info_t const * p_info, uint8_t * const p_output_key, size_t * const p_output_key_size, uint8_t const * const p_input_key, size_t input_key_size, uint8_t const * p_salt, size_t salt_size, uint8_t const * const p_ainfo, size_t ainfo_size, nrf_crypto_hkdf_mode_t mode); #ifdef __cplusplus } #endif /**@} */ #endif // #ifndef NRF_CRYPTO_HKDF_H__