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/* randstr.c -- Functions for getting random data
*
* GPLv2 only - Copyright (C) 2009 - 2012
* David Sommerseth <dazo@users.sourceforge.net>
*
* 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; version 2
* of the License.
*
* 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.
*
*/
/**
* @file randstr.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2009-01-10
*
* @brief Simple functions for gathering random data
*
*/
#include <stdio.h>
#include <unistd.h>
#include <openssl/rand.h>
#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephia_log.h>
/**
* Flag for indicating if the random generator has been initialised
*/
static int rand_init = 0;
/**
* Generate some random data and return a string. This function makes use of OpenSSL's RAND_pseudo_bytes()
* function.
*
* @param ctx eurephiaCTX
* @param rndstr Return buffer of the random data
* @param len Size of the return buffer
*
* @return Returns 1 on success, otherwise 0.
*/
int eurephia_randstring(eurephiaCTX *ctx, void *rndstr, size_t len) {
int attempts = 0;
do {
if( !rand_init ) {
if( !RAND_load_file("/dev/urandom", 64) ) {
eurephia_log(ctx, LOG_FATAL, 0, "Could not load random data from /dev/urandom");
return 0;
}
rand_init = 1;
}
if( RAND_pseudo_bytes((unsigned char *) rndstr, len) ) {
return 1;
}
sleep(1);
rand_init = 0;
} while( attempts++ < 11 );
eurephia_log(ctx, LOG_FATAL, 0, "RAND_pseudo_bytes() could not generate enough random data");
return 0;
}
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