sha256.h

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/*-
 * SPDX-FileCopyrightText: 2005 Colin Percival
 * SPDX-FileCopyrightText: 2013 Christian Mehlis & René Kijewski
 * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
 * SPDX-FileCopyrightText: 2016 OTA keys S.A.
 * SPDX-License-Identifier: BSD-2-Clause
 */
 
#pragma once

 
#include <inttypes.h>
#include <stddef.h>
 
#include "hashes/sha2xx_common.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define SHA256_DIGEST_LENGTH 32

#define SHA256_INTERNAL_BLOCK_SIZE (64)

typedef sha2xx_context_t sha256_context_t;

typedef struct {
    sha256_context_t c_in;
    sha256_context_t c_out;
} hmac_context_t;

typedef struct {
    size_t index;
    unsigned char element[SHA256_DIGEST_LENGTH];
} sha256_chain_idx_elm_t;

void sha256_init(sha256_context_t *ctx);

static inline void sha256_update(sha256_context_t *ctx, const void *data, size_t len)
{
    sha2xx_update(ctx, data, len);
}

static inline void sha256_final(sha256_context_t *ctx, void *digest)
{
    sha2xx_final(ctx, digest, SHA256_DIGEST_LENGTH);
}

void sha256(const void *data, size_t len, void *digest);

void hmac_sha256_init(hmac_context_t *ctx, const void *key, size_t key_length);

void hmac_sha256_update(hmac_context_t *ctx, const void *data, size_t len);

void hmac_sha256_final(hmac_context_t *ctx, void *digest);

void hmac_sha256(const void *key, size_t key_length,
                        const void *data, size_t len, void *digest);

void *sha256_chain(const void *seed, size_t seed_length,
                   size_t elements, void *tail_element);

void *sha256_chain_with_waypoints(const void *seed, size_t seed_length,
                                  size_t elements, void *tail_element,
                                  sha256_chain_idx_elm_t *waypoints,
                                  size_t *waypoints_length);

int sha256_chain_verify_element(void *element,
                                size_t element_index,
                                void *tail_element,
                                size_t chain_length);
 
#ifdef __cplusplus
}
#endif