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authorLibravatar vnugent <public@vaughnnugent.com>2024-05-26 17:39:40 -0400
committerLibravatar vnugent <public@vaughnnugent.com>2024-05-26 17:39:40 -0400
commita8a6efb2319f739e5faae550561dc27d9dd1e88d (patch)
treefb24ccfb03e5eb57861182f89794992cfe02bb6e /src/hkdf.h
parent72e1b7be4031e2fd4d258fcf434ad049c0029201 (diff)
chore: Update libs, reorder files, internalize private headers
Diffstat (limited to 'src/hkdf.h')
-rw-r--r--src/hkdf.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/hkdf.h b/src/hkdf.h
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index 0000000..460e203
--- /dev/null
+++ b/src/hkdf.h
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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_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 */