d93aa10bac
For consistency and safety, change the CMC and HSH functions to accept signed lengths and handle negative values as errors. Also, change the input data type to void * to not require casting in the caller.
121 lines
3 KiB
C
121 lines
3 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Miroslav Lichvar 2018
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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Routines implementing crypto hashing using the nettle library.
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*/
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#include "config.h"
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#include "sysincl.h"
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#include <nettle/nettle-meta.h>
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#include "hash.h"
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#include "memory.h"
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struct hash {
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const HSH_Algorithm algorithm;
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const char *int_name;
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const struct nettle_hash *nettle_hash;
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void *context;
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};
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static struct hash hashes[] = {
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{ HSH_MD5, "md5", NULL, NULL },
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{ HSH_SHA1, "sha1", NULL, NULL },
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{ HSH_SHA256, "sha256", NULL, NULL },
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{ HSH_SHA384, "sha384", NULL, NULL },
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{ HSH_SHA512, "sha512", NULL, NULL },
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{ HSH_SHA3_224, "sha3_224", NULL, NULL },
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{ HSH_SHA3_256, "sha3_256", NULL, NULL },
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{ HSH_SHA3_384, "sha3_384", NULL, NULL },
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{ HSH_SHA3_512, "sha3_512", NULL, NULL },
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{ 0, NULL, NULL, NULL }
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};
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int
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HSH_GetHashId(HSH_Algorithm algorithm)
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{
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int id, nid;
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for (id = 0; hashes[id].algorithm != 0; id++) {
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if (hashes[id].algorithm == algorithm)
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break;
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}
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if (hashes[id].algorithm == 0)
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return -1;
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if (hashes[id].context)
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return id;
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for (nid = 0; nettle_hashes[nid]; nid++) {
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if (!strcmp(hashes[id].int_name, nettle_hashes[nid]->name))
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break;
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}
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if (!nettle_hashes[nid] || !nettle_hashes[nid]->context_size || !nettle_hashes[nid]->init)
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return -1;
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hashes[id].nettle_hash = nettle_hashes[nid];
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hashes[id].context = Malloc(hashes[id].nettle_hash->context_size);
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return id;
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}
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int
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HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
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unsigned char *out, int out_len)
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{
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const struct nettle_hash *hash;
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void *context;
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if (in1_len < 0 || in2_len < 0 || out_len < 0)
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return 0;
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hash = hashes[id].nettle_hash;
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context = hashes[id].context;
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if (out_len > hash->digest_size)
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out_len = hash->digest_size;
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hash->init(context);
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hash->update(context, in1_len, in1);
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if (in2)
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hash->update(context, in2_len, in2);
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hash->digest(context, out_len, out);
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return out_len;
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}
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void
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HSH_Finalise(void)
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{
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int i;
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for (i = 0; hashes[i].algorithm != 0; i++) {
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if (hashes[i].context)
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Free(hashes[i].context);
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}
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}
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