+++ /dev/null
-/*
- digest.c -- Digest handling
- Copyright (C) 2007-2012 Guus Sliepen <guus@tinc-vpn.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- 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.
-*/
-
-#include "system.h"
-
-#include "digest.h"
-#include "logger.h"
-
-static struct {
- const char *name;
- int algo;
- int nid;
-} digesttable[] = {
- {"none", GCRY_MD_NONE, 0},
- {"sha1", GCRY_MD_SHA1, 64},
- {"sha256", GCRY_MD_SHA256, 672},
- {"sha384", GCRY_MD_SHA384, 673},
- {"sha512", GCRY_MD_SHA512, 674},
-};
-
-static bool nametodigest(const char *name, int *algo) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(digesttable[i].name && !strcasecmp(name, digesttable[i].name)) {
- *algo = digesttable[i].algo;
- return true;
- }
- }
-
- return false;
-}
-
-static bool nidtodigest(int nid, int *algo) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(nid == digesttable[i].nid) {
- *algo = digesttable[i].algo;
- return true;
- }
- }
-
- return false;
-}
-
-static bool digesttonid(int algo, int *nid) {
- int i;
-
- for(i = 0; i < sizeof digesttable / sizeof *digesttable; i++) {
- if(algo == digesttable[i].algo) {
- *nid = digesttable[i].nid;
- return true;
- }
- }
-
- return false;
-}
-
-static bool digest_open(digest_t *digest, int algo, int maclength) {
- if(!digesttonid(algo, &digest->nid)) {
- logger(DEBUG_ALWAYS, LOG_DEBUG, "Digest %d has no corresponding nid!", algo);
- return false;
- }
-
- unsigned int len = gcry_md_get_algo_dlen(algo);
-
- if(maclength > len || maclength < 0)
- digest->maclength = len;
- else
- digest->maclength = maclength;
-
- digest->algo = algo;
- digest->hmac = NULL;
-
- return true;
-}
-
-bool digest_open_by_name(digest_t *digest, const char *name, int maclength) {
- int algo;
-
- if(!nametodigest(name, &algo)) {
- logger(DEBUG_ALWAYS, LOG_DEBUG, "Unknown digest name '%s'!", name);
- return false;
- }
-
- return digest_open(digest, algo, maclength);
-}
-
-bool digest_open_by_nid(digest_t *digest, int nid, int maclength) {
- int algo;
-
- if(!nidtodigest(nid, &algo)) {
- logger(DEBUG_ALWAYS, LOG_DEBUG, "Unknown digest ID %d!", nid);
- return false;
- }
-
- return digest_open(digest, algo, maclength);
-}
-
-bool digest_open_sha1(digest_t *digest, int maclength) {
- return digest_open(digest, GCRY_MD_SHA1, maclength);
-}
-
-void digest_close(digest_t *digest) {
- if(digest->hmac)
- gcry_md_close(digest->hmac);
- digest->hmac = NULL;
-}
-
-bool digest_set_key(digest_t *digest, const void *key, size_t len) {
- if(!digest->hmac)
- gcry_md_open(&digest->hmac, digest->algo, GCRY_MD_FLAG_HMAC);
- if(!digest->hmac)
- return false;
-
- return !gcry_md_setkey(digest->hmac, key, len);
-}
-
-bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) {
- unsigned int len = gcry_md_get_algo_dlen(digest->algo);
-
- if(digest->hmac) {
- char *tmpdata;
- gcry_md_reset(digest->hmac);
- gcry_md_write(digest->hmac, indata, inlen);
- tmpdata = gcry_md_read(digest->hmac, digest->algo);
- if(!tmpdata)
- return false;
- memcpy(outdata, tmpdata, digest->maclength);
- } else {
- char tmpdata[len];
- gcry_md_hash_buffer(digest->algo, tmpdata, indata, inlen);
- memcpy(outdata, tmpdata, digest->maclength);
- }
-
- return true;
-}
-
-bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const void *cmpdata) {
- unsigned int len = digest->maclength;
- char outdata[len];
-
- return digest_create(digest, indata, inlen, outdata) && !memcmp(cmpdata, outdata, len);
-}
-
-int digest_get_nid(const digest_t *digest) {
- return digest->nid;
-}
-
-size_t digest_length(const digest_t *digest) {
- return digest->maclength;
-}
-
-bool digest_active(const digest_t *digest) {
- return digest->algo != GCRY_MD_NONE;
-}