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external/nrf_oberon/include/ocrypto_hmac_sha256.h vendored Normal file
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/**
* Copyright (c) 2019 - 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.
*
*/
/**@file
* @defgroup nrf_oberon_hmac HMAC - Hash-based Aessage Authentication Code
* @ingroup nrf_oberon
* @{
* @brief HMAC is a hash-based Message Authentication Code utilizing a secure hash function.
* @}
* @defgroup nrf_oberon_hmac_256 HMAC APIs using SHA-256
* @ingroup nrf_oberon_hmac
* @{
* @brief Type declarations and APIs for the HMAC-SHA256 algorithm.
*
* HMAC-SHA256 is an algorithm for message authentication using the
* cryptographic hash function SHA256 and a reusable secret key. Users in
* possession of the key can verify the integrity and authenticity of the
* message.
*
* @see [RFC 2104 - HMAC: Keyed-Hashing for Message Authentication](http://tools.ietf.org/html/rfc2104)
*/
#ifndef OCRYPTO_HMAC_SHA256_H
#define OCRYPTO_HMAC_SHA256_H
#include <stddef.h>
#include <stdint.h>
#include "include/ocrypto_sha256.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Maximum key length.
*/
#define ocrypto_hmac_sha256_KEY_BYTES_MAX (64)
/**
* Length of the authenticator.
*/
#define ocrypto_hmac_sha256_BYTES (32)
/**@cond */
typedef struct
{
ocrypto_sha256_ctx hash_ctx;
uint8_t ikey[ocrypto_hmac_sha256_KEY_BYTES_MAX];
uint8_t okey[ocrypto_hmac_sha256_KEY_BYTES_MAX];
uint8_t key[ocrypto_hmac_sha256_KEY_BYTES_MAX];
} ocrypto_hmac_sha256_ctx;
/**@endcond */
/**@name Incremental HMAC-SHA256 generator.
*
* This group of functions can be used to incrementally compute HMAC-SHA256
* for a given message.
*/
/**@{*/
/**
* HMAC-SHA256 initialization.
*
* The generator state @p ctx is initialized by this function.
*
* @param[out] ctx Generator state.
* @param key HMAC key.
* @param key_len Length of @p key.
*/
void ocrypto_hmac_sha256_init(ocrypto_hmac_sha256_ctx * ctx,
const uint8_t* key, size_t key_len);
/**
* HMAC-SHA256 incremental data input.
*
* The generator state @p ctx is updated to hash a message chunk @p in.
*
* This function can be called repeatedly until the whole message is processed.
*
* @param[in,out] ctx Generator state.
* @param in Input data.
* @param in_len Length of @p in.
*
* @remark Initialization of the generator state @p ctx through
* @c ocrypto_hmac_sha256_init is required before this function can be called.
*/
void ocrypto_hmac_sha256_update(ocrypto_hmac_sha256_ctx * ctx,
const uint8_t* in, size_t in_len);
/**
* HMAC-SHA256 output.
*
* The generator state @p ctx is updated to finalize the HMAC calculation.
* The HMAC digest is put into @p r.
*
* @param[in,out] ctx Generator state.
* @param[out] r Generated HMAC digest.
*
* @remark Initialization of the generator state @p ctx through
* @c ocrypto_hmac_sha256_init is required before this function can be called.
*
* @remark After return, the generator state @p ctx must no longer be used with
* @c ocrypto_hmac_sha256_update and @c ocrypto_hmac_sha256_final unless it is
* reinitialized using @c ocrypto_hmac_sha256_init.
*/
void ocrypto_hmac_sha256_final(ocrypto_hmac_sha256_ctx * ctx,
uint8_t r[ocrypto_hmac_sha256_BYTES]);
/**@}*/
/**
* HMAC-SHA256 algorithm.
*
* The input message @p in is authenticated using the key @p k. The computed
* authenticator is put into @p r. To verify the authenticator, the recipient
* needs to recompute the HMAC authenticator and can then compare it with the
* received authenticator.
*
* @param[out] r HMAC output.
* @param key HMAC key.
* @param key_len Length of @p key. 0 <= @p key_len <= @c ocrypto_hmac_sha256_KEY_BYTES_MAX.
* @param in Input data.
* @param in_len Length of @p in.
*/
void ocrypto_hmac_sha256(
uint8_t r[ocrypto_hmac_sha256_BYTES],
const uint8_t* key, size_t key_len,
const uint8_t* in, size_t in_len);
#ifdef __cplusplus
}
#endif
#endif /* #ifndef OCRYPTO_HMAC_SHA256_H */
/** @} */