romulus-hkdf.h

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/*
 * Copyright (C) 2021 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * DEALINGS IN THE SOFTWARE.
 */

#ifndef LWCRYPTO_ROMULUS_HKDF_H
#define LWCRYPTO_ROMULUS_HKDF_H

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define ROMULUS_HKDF_OUTPUT_SIZE 32

typedef struct
{
    unsigned char prk[ROMULUS_HKDF_OUTPUT_SIZE];

    unsigned char out[ROMULUS_HKDF_OUTPUT_SIZE];

    unsigned char counter;

    unsigned char posn;

} romulus_hkdf_state_t;

int romulus_hkdf
    (unsigned char *out, size_t outlen,
     const unsigned char *key, size_t keylen,
     const unsigned char *salt, size_t saltlen,
     const unsigned char *info, size_t infolen);

void romulus_hkdf_extract
    (romulus_hkdf_state_t *state,
     const unsigned char *key, size_t keylen,
     const unsigned char *salt, size_t saltlen);

int romulus_hkdf_expand
    (romulus_hkdf_state_t *state,
     const unsigned char *info, size_t infolen,
     unsigned char *out, size_t outlen);

void romulus_hkdf_free(romulus_hkdf_state_t *state);

#ifdef __cplusplus
}
#endif

#endif