tc_hmac.h

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/* hmac.h - TinyCrypt interface to an HMAC implementation */

/*
 *  Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
 *
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 *  modification, are permitted provided that the following conditions are met:
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#ifndef __TC_HMAC_H__
#define __TC_HMAC_H__

#include "tc_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__*/