From 0afa91b3c4f62db18c715e8499368a7c2c9ee5bd Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Fri, 18 Apr 2014 00:18:10 +0200 Subject: [PATCH] Add missing crypto.c. --- src/crypto.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 src/crypto.c diff --git a/src/crypto.c b/src/crypto.c new file mode 100644 index 00000000..cf000c8a --- /dev/null +++ b/src/crypto.c @@ -0,0 +1,46 @@ +/* + crypto.c -- Cryptographic miscellaneous functions and initialisation + Copyright (C) 2014 Guus Sliepen + + 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 "crypto.h" + +//TODO: use a strict random source once to seed a PRNG? + +static int random_fd = -1; + +void crypto_init(void) { + random_fd = open("/dev/urandom", O_RDONLY); + if(random_fd < 0) + random_fd = open("/dev/random", O_RDONLY); + if(random_fd < 0) { + fprintf(stderr, "Could not open source of random numbers: %s\n", strerror(errno)); + abort(); + } +} + +void crypto_exit(void) { +} + +void randomize(void *out, size_t outlen) { + if(read(random_fd, out, outlen) != outlen) { + fprintf(stderr, "Error reading random numbers: %s\n", strerror(errno)); + abort(); + } +} -- 2.39.2