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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Package: noscrypt
* File: hkdf.h
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with noscrypt. If not, see http://www.gnu.org/licenses/.
*/
#pragma once
#ifndef _NC_HKDF_H
#define _NC_HKDF_H
#include "nc-util.h"
#include "nc-crypto.h"
/*
* IMPORTANT:
* The HKDF_IN_BUF_SIZE defintion sets the internal stack buffer size to use
* during fallback HKDF_Expand operations.
*
* 128 bytes should be more than enough for most use cases, without going
* overboard. Could be dialed in better for specific use cases later.
*/
#ifndef HKDF_IN_BUF_SIZE
#define HKDF_IN_BUF_SIZE 0x80
#endif
/* typedefs for hdkf callback functions */
typedef cstatus_t (*hmac_hash_fn)(void* ctx, cspan_t data);
typedef cstatus_t (*hmac_finish_fn)(void* ctx, sha256_t hmacOut32);
struct nc_hkdf_fn_cb_struct
{
hmac_hash_fn update;
hmac_finish_fn finish;
};
cstatus_t hkdfExpandProcess(
const struct nc_hkdf_fn_cb_struct* handler,
void* ctx,
cspan_t info,
span_t okm
);
#endif /* !_NC_HKDF_H */
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