From 6ff8bb11774c51fd341b7699a3938fd894995fbf Mon Sep 17 00:00:00 2001 From: vnugent Date: Thu, 25 Apr 2024 17:45:42 -0400 Subject: refactor: Finish support and testing for mbedtls --- include/hkdf.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 include/hkdf.h (limited to 'include/hkdf.h') diff --git a/include/hkdf.h b/include/hkdf.h new file mode 100644 index 0000000..460e203 --- /dev/null +++ b/include/hkdf.h @@ -0,0 +1,61 @@ +/* +* 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_func)(void* ctx, const cspan_t* data); +typedef cstatus_t (*hmac_finish_fn)(void* ctx, sha256_t hmacOut32); + +struct nc_hkdf_fn_cb_struct +{ + hmac_hash_func update; + hmac_finish_fn finish; +}; + +cstatus_t hkdfExpandProcess( + const struct nc_hkdf_fn_cb_struct* handler, + void* ctx, + const cspan_t* info, + span_t* okm +); + +#endif /* !_NC_HKDF_H */ -- cgit