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.
111 lines
2.7 KiB
C
111 lines
2.7 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 2012
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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 NSSLOWHASH API of the NSS library.
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*/
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#include "config.h"
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#include <nss.h>
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#include <hasht.h>
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#include <nsslowhash.h>
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#include "hash.h"
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#include "util.h"
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static NSSLOWInitContext *ictx;
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struct hash {
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HASH_HashType type;
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HSH_Algorithm algorithm;
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NSSLOWHASHContext *context;
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};
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static struct hash hashes[] = {
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{ HASH_AlgMD5, HSH_MD5, NULL },
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{ HASH_AlgSHA1, HSH_SHA1, NULL },
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{ HASH_AlgSHA256, HSH_SHA256, NULL },
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{ HASH_AlgSHA384, HSH_SHA384, NULL },
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{ HASH_AlgSHA512, HSH_SHA512, NULL },
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{ 0, 0, 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 i;
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for (i = 0; hashes[i].algorithm != 0; i++) {
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if (hashes[i].algorithm == algorithm)
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break;
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}
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if (hashes[i].algorithm == 0)
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return -1; /* not found */
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if (!ictx && !(ictx = NSSLOW_Init()))
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return -1; /* couldn't init NSS */
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if (!hashes[i].context &&
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!(hashes[i].context = NSSLOWHASH_NewContext(ictx, hashes[i].type)))
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return -1; /* couldn't init hash */
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return i;
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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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unsigned char buf[MAX_HASH_LENGTH];
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unsigned int ret = 0;
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if (in1_len < 0 || in2_len < 0 || out_len < 0)
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return 0;
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NSSLOWHASH_Begin(hashes[id].context);
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NSSLOWHASH_Update(hashes[id].context, in1, in1_len);
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if (in2)
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NSSLOWHASH_Update(hashes[id].context, in2, in2_len);
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NSSLOWHASH_End(hashes[id].context, buf, &ret, sizeof (buf));
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ret = MIN(ret, out_len);
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memcpy(out, buf, ret);
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return ret;
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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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NSSLOWHASH_Destroy(hashes[i].context);
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}
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if (ictx)
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NSSLOW_Shutdown(ictx);
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}
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