2 digest.c -- Digest handling
3 Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <openssl/err.h>
27 static void set_maclength(digest_t *digest, int maclength) {
28 int digestlen = EVP_MD_size(digest->digest);
30 if(maclength > digestlen || maclength < 0)
31 digest->maclength = digestlen;
33 digest->maclength = maclength;
36 bool digest_open_by_name(digest_t *digest, const char *name, int maclength) {
37 digest->digest = EVP_get_digestbyname(name);
40 logger(LOG_DEBUG, "Unknown digest name '%s'!", name);
44 set_maclength(digest, maclength);
48 bool digest_open_by_nid(digest_t *digest, int nid, int maclength) {
49 digest->digest = EVP_get_digestbynid(nid);
52 logger(LOG_DEBUG, "Unknown digest nid %d!", nid);
56 set_maclength(digest, maclength);
60 bool digest_open_sha1(digest_t *digest, int maclength) {
61 digest->digest = EVP_sha1();
63 set_maclength(digest, maclength);
67 void digest_close(digest_t *digest) {
70 bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) {
71 size_t len = EVP_MD_size(digest->digest);
72 unsigned char tmpdata[len];
76 if(!EVP_DigestInit(&ctx, digest->digest)
77 || !EVP_DigestUpdate(&ctx, indata, inlen)
78 || !EVP_DigestFinal(&ctx, tmpdata, NULL)) {
79 logger(LOG_DEBUG, "Error creating digest: %s", ERR_error_string(ERR_get_error(), NULL));
83 memcpy(outdata, tmpdata, digest->maclength);
87 bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const void *cmpdata) {
88 size_t len = EVP_MD_size(digest->digest);
89 unsigned char outdata[len];
91 return digest_create(digest, indata, inlen, outdata) && !memcmp(cmpdata, outdata, digest->maclength);
94 int digest_get_nid(const digest_t *digest) {
95 return digest->digest ? digest->digest->type : 0;
98 size_t digest_length(const digest_t *digest) {
99 return digest->maclength;
102 bool digest_active(const digest_t *digest) {
103 return digest->digest && digest->digest->type != 0;