2 crypto.c -- Cryptographic miscellaneous functions and initialisation
3 Copyright (C) 2007-2014 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.
20 #include "../system.h"
22 #include "../crypto.h"
26 static int random_fd = -1;
28 static void random_init(void) {
29 random_fd = open("/dev/urandom", O_RDONLY);
31 random_fd = open("/dev/random", O_RDONLY);
33 fprintf(stderr, "Could not open source of random numbers: %s\n", strerror(errno));
38 static void random_exit(void) {
42 void randomize(void *out, size_t outlen) {
44 size_t len = read(random_fd, out, outlen);
46 if(errno == EAGAIN || errno == EINTR)
48 fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
61 void random_init(void) {
62 if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
63 fprintf(stderr, "CryptAcquireContext() failed!\n");
68 void random_exit(void) {
69 CryptReleaseContext(prov, 0);
72 void randomize(void *out, size_t outlen) {
73 if(!CryptGenRandom(prov, outlen, out)) {
74 fprintf(stderr, "CryptGenRandom() failed\n");
81 void crypto_init(void) {
85 void crypto_exit(void) {