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cmac: add CMAC interface

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Add cmac.h and stubs for cipher-based message authentication code
(CMAC).
This commit is contained in:
Miroslav Lichvar 2019-09-17 16:57:03 +02:00
parent 10a42c1e04
commit f3f840551a
2 changed files with 70 additions and 0 deletions
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41
cmac.h Normal file
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@ -0,0 +1,41 @@
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2019
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header file for CMAC.
*/
#ifndef GOT_CMAC_H
#define GOT_CMAC_H
typedef struct CMC_Instance_Record *CMC_Instance;
extern unsigned int CMC_GetKeyLength(const char *cipher);
extern CMC_Instance CMC_CreateInstance(const char *cipher, const unsigned char *key,
unsigned int length);
extern unsigned int CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
unsigned char *out, unsigned int out_len);
extern void CMC_DestroyInstance(CMC_Instance inst);
#endif

29
stubs.c
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@ -28,6 +28,7 @@
#include "config.h"
#include "clientlog.h"
#include "cmac.h"
#include "cmdmon.h"
#include "keys.h"
#include "logging.h"
@ -410,3 +411,31 @@ NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_Remote_Address *r
}
#endif /* !FEAT_SIGND */
#ifndef HAVE_CMAC
unsigned int
CMC_GetKeyLength(const char *cipher)
{
return 0;
}
CMC_Instance
CMC_CreateInstance(const char *cipher, const unsigned char *key, unsigned int length)
{
return NULL;
}
unsigned int
CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
unsigned char *out, unsigned int out_len)
{
return 0;
}
void
CMC_DestroyInstance(CMC_Instance inst)
{
}
#endif /* !HAVE_CMAC */