tc_sha256.h

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/* sha256.h - TinyCrypt interface to a SHA-256 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_SHA256_H__
#define __TC_SHA256_H__

#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define TC_SHA256_BLOCK_SIZE (64)
#define TC_SHA256_DIGEST_SIZE (32)
#define TC_SHA256_STATE_BLOCKS (TC_SHA256_DIGEST_SIZE/4)

struct tc_sha256_state_struct {
  unsigned int iv[TC_SHA256_STATE_BLOCKS];
  uint64_t bits_hashed;
  uint8_t leftover[TC_SHA256_BLOCK_SIZE];
  size_t leftover_offset;
};

typedef struct tc_sha256_state_struct *TCSha256State_t;

int tc_sha256_init(TCSha256State_t s);

int tc_sha256_update (TCSha256State_t s, const uint8_t *data, size_t datalen);

int tc_sha256_final(uint8_t *digest, TCSha256State_t s);

#ifdef __cplusplus
}
#endif

#endif /* __TC_SHA256_H__ */