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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2018
*
* 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.
*
**********************************************************************
=======================================================================
Routines implementing crypto hashing using the nettle library.
*/
#include "config.h"
#include "sysincl.h"
#include <nettle/nettle-meta.h>
#include "hash.h"
#include "memory.h"
struct hash {
const HSH_Algorithm algorithm;
const char *int_name;
const struct nettle_hash *nettle_hash;
void *context;
};
static struct hash hashes[] = {
{ HSH_MD5, "md5", NULL, NULL },
{ HSH_SHA1, "sha1", NULL, NULL },
{ HSH_SHA256, "sha256", NULL, NULL },
{ HSH_SHA384, "sha384", NULL, NULL },
{ HSH_SHA512, "sha512", NULL, NULL },
{ HSH_SHA3_224, "sha3_224", NULL, NULL },
{ HSH_SHA3_256, "sha3_256", NULL, NULL },
{ HSH_SHA3_384, "sha3_384", NULL, NULL },
{ HSH_SHA3_512, "sha3_512", NULL, NULL },
{ 0, NULL, NULL, NULL }
};
int
HSH_GetHashId(HSH_Algorithm algorithm)
{
int id, nid;
if (algorithm == HSH_MD5_NONCRYPTO)
algorithm = HSH_MD5;
for (id = 0; hashes[id].algorithm != 0; id++) {
if (hashes[id].algorithm == algorithm)
break;
}
if (hashes[id].algorithm == 0)
return -1;
if (hashes[id].context)
return id;
for (nid = 0; nettle_hashes[nid]; nid++) {
if (!strcmp(hashes[id].int_name, nettle_hashes[nid]->name))
break;
}
if (!nettle_hashes[nid] || !nettle_hashes[nid]->context_size || !nettle_hashes[nid]->init)
return -1;
hashes[id].nettle_hash = nettle_hashes[nid];
hashes[id].context = Malloc(hashes[id].nettle_hash->context_size);
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)
{
const struct nettle_hash *hash;
void *context;
if (in1_len < 0 || in2_len < 0 || out_len < 0)
return 0;
hash = hashes[id].nettle_hash;
context = hashes[id].context;
if (out_len > hash->digest_size)
out_len = hash->digest_size;
hash->init(context);
hash->update(context, in1_len, in1);
if (in2)
hash->update(context, in2_len, in2);
hash->digest(context, out_len, out);
return out_len;
}
void
HSH_Finalise(void)
{
int i;
for (i = 0; hashes[i].algorithm != 0; i++) {
if (hashes[i].context)
Free(hashes[i].context);
}
}
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