115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
|
|
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.
|
|
*
|
|
**********************************************************************
|
|
|
|
=======================================================================
|
|
|
|
Support for AES128 and AES256 CMAC in Nettle.
|
|
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include "sysincl.h"
|
|
|
|
#include <nettle/cmac.h>
|
|
|
|
#include "cmac.h"
|
|
#include "memory.h"
|
|
|
|
struct CMC_Instance_Record {
|
|
int key_length;
|
|
union {
|
|
struct cmac_aes128_ctx aes128;
|
|
struct cmac_aes256_ctx aes256;
|
|
} context;
|
|
};
|
|
|
|
/* ================================================== */
|
|
|
|
unsigned int
|
|
CMC_GetKeyLength(const char *cipher)
|
|
{
|
|
if (strcmp(cipher, "AES128") == 0)
|
|
return AES128_KEY_SIZE;
|
|
else if (strcmp(cipher, "AES256") == 0)
|
|
return AES256_KEY_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
/* ================================================== */
|
|
|
|
CMC_Instance
|
|
CMC_CreateInstance(const char *cipher, const unsigned char *key, unsigned int length)
|
|
{
|
|
CMC_Instance inst;
|
|
|
|
if (length == 0 || length != CMC_GetKeyLength(cipher))
|
|
return NULL;
|
|
|
|
inst = MallocNew(struct CMC_Instance_Record);
|
|
inst->key_length = length;
|
|
|
|
switch (length) {
|
|
case AES128_KEY_SIZE:
|
|
cmac_aes128_set_key(&inst->context.aes128, key);
|
|
break;
|
|
case AES256_KEY_SIZE:
|
|
cmac_aes256_set_key(&inst->context.aes256, key);
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
|
|
return inst;
|
|
}
|
|
|
|
/* ================================================== */
|
|
|
|
unsigned int
|
|
CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
|
|
unsigned char *out, unsigned int out_len)
|
|
{
|
|
if (out_len > CMAC128_DIGEST_SIZE)
|
|
out_len = CMAC128_DIGEST_SIZE;
|
|
|
|
switch (inst->key_length) {
|
|
case AES128_KEY_SIZE:
|
|
cmac_aes128_update(&inst->context.aes128, in_len, in);
|
|
cmac_aes128_digest(&inst->context.aes128, out_len, out);
|
|
break;
|
|
case AES256_KEY_SIZE:
|
|
cmac_aes256_update(&inst->context.aes256, in_len, in);
|
|
cmac_aes256_digest(&inst->context.aes256, out_len, out);
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
|
|
return out_len;
|
|
}
|
|
|
|
/* ================================================== */
|
|
|
|
void
|
|
CMC_DestroyInstance(CMC_Instance inst)
|
|
{
|
|
Free(inst);
|
|
}
|