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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2021
*
* 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.
*
**********************************************************************
=======================================================================
Crypto hashing using the GnuTLS library
*/
#include "config.h"
#include "sysincl.h"
#include <gnutls/crypto.h>
#include "hash.h"
#include "logging.h"
struct hash {
const HSH_Algorithm algorithm;
const gnutls_digest_algorithm_t type;
gnutls_hash_hd_t handle;
};
static struct hash hashes[] = {
{ HSH_MD5_NONCRYPTO, GNUTLS_DIG_MD5, NULL },
{ HSH_MD5, GNUTLS_DIG_MD5, NULL },
{ HSH_SHA1, GNUTLS_DIG_SHA1, NULL },
{ HSH_SHA256, GNUTLS_DIG_SHA256, NULL },
{ HSH_SHA384, GNUTLS_DIG_SHA384, NULL },
{ HSH_SHA512, GNUTLS_DIG_SHA512, NULL },
{ HSH_SHA3_224, GNUTLS_DIG_SHA3_224, NULL },
{ HSH_SHA3_256, GNUTLS_DIG_SHA3_256, NULL },
{ HSH_SHA3_384, GNUTLS_DIG_SHA3_384, NULL },
{ HSH_SHA3_512, GNUTLS_DIG_SHA3_512, NULL },
{ 0, 0, NULL }
};
static int gnutls_initialised = 0;
int
HSH_GetHashId(HSH_Algorithm algorithm)
{
int id, r;
if (!gnutls_initialised) {
r = gnutls_global_init();
if (r < 0)
LOG_FATAL("Could not initialise %s : %s", "gnutls", gnutls_strerror(r));
gnutls_initialised = 1;
}
for (id = 0; hashes[id].algorithm != 0; id++) {
if (hashes[id].algorithm == algorithm)
break;
}
if (hashes[id].algorithm == 0)
return -1;
if (hashes[id].handle)
return id;
if (algorithm == HSH_MD5_NONCRYPTO)
GNUTLS_FIPS140_SET_LAX_MODE();
r = gnutls_hash_init(&hashes[id].handle, hashes[id].type);
if (algorithm == HSH_MD5_NONCRYPTO)
GNUTLS_FIPS140_SET_STRICT_MODE();
if (r < 0) {
DEBUG_LOG("Could not initialise %s : %s", "hash", gnutls_strerror(r));
hashes[id].handle = NULL;
return -1;
}
return id;
}
int
HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
unsigned char *out, int out_len)
{
unsigned char buf[MAX_HASH_LENGTH];
gnutls_hash_hd_t handle;
int hash_len;
if (in1_len < 0 || in2_len < 0 || out_len < 0)
return 0;
handle = hashes[id].handle;
hash_len = gnutls_hash_get_len(hashes[id].type);
if (out_len > hash_len)
out_len = hash_len;
if (hash_len > sizeof (buf))
return 0;
if (gnutls_hash(handle, in1, in1_len) < 0 ||
(in2 && gnutls_hash(handle, in2, in2_len) < 0)) {
/* Reset the state */
gnutls_hash_output(handle, buf);
return 0;
}
gnutls_hash_output(handle, buf);
memcpy(out, buf, out_len);
return out_len;
}
void
HSH_Finalise(void)
{
int i;
if (!gnutls_initialised)
return;
for (i = 0; hashes[i].algorithm != 0; i++) {
if (hashes[i].handle)
gnutls_hash_deinit(hashes[i].handle, NULL);
}
gnutls_global_deinit();
}
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