hmac.h

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/* hmac.h - TinyCrypt interface to an HMAC implementation */
 
/*
 *  Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *    - Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *
 *    - Redistributions in binary form 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.
 *
 *    - Neither the name of Intel Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */
 
#ifndef __TC_HMAC_H__
#define __TC_HMAC_H__
 
#include "sha256.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct tc_hmac_state_struct {
    /* the internal state required by h */
    struct tc_sha256_state_struct hash_state;
    /* HMAC key schedule */
    uint8_t key[2*TC_SHA256_BLOCK_SIZE];
};
typedef struct tc_hmac_state_struct *TCHmacState_t;
 
int tc_hmac_set_key(TCHmacState_t ctx, const uint8_t *key,
            unsigned int key_size);
 
int tc_hmac_init(TCHmacState_t ctx);
 
int tc_hmac_update(TCHmacState_t ctx, const void *data,
           unsigned int data_length);
 
int tc_hmac_final(uint8_t *tag, unsigned int taglen, TCHmacState_t ctx);
 
#ifdef __cplusplus
}
#endif
 
#endif /*__TC_HMAC_H__*/