/* * Ouroboros - Copyright (C) 2016 - 2020 * * Pseudo random generator * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * version 2.1 as published by the Free Software Foundation. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., http://www.fsf.org/about/contact/. */ #include "config.h" #include <ouroboros/random.h> #if defined(__APPLE__) /* Barf */ #undef __OSX_AVAILABLE #define __OSX_AVAILABLE(arg) #undef __IOS_AVAILABLE #define __IOS_AVAILABLE(arg) #undef __TVOS_AVAILABLE #define __TVOS_AVAILABLE(arg) #undef __WATCHOS_AVAILABLE #define __WATCHOS_AVAILABLE(arg) #include <sys/random.h> #elif defined(HAVE_SYS_RANDOM) #include <sys/random.h> #elif defined(HAVE_LIBGCRYPT) #include <gcrypt.h> #elif defined(__FreeBSD__) #include <stdlib.h> #elif defined(HAVE_OPENSSL_RNG) #include <openssl/rand.h> #include <limits.h> #endif int random_buffer(void * buf, size_t len) { #if defined(__APPLE__) return getentropy(buf, len); #elif defined(__FreeBSD__) arc4random_buf(buf, len); return 0; #elif defined(HAVE_SYS_RANDOM) return getrandom(buf, len, GRND_NONBLOCK); /* glibc 2.25 */ #elif defined(HAVE_LIBGCRYPT) gcry_randomize(buf, len, GCRY_STRONG_RANDOM); return 0; #elif defined(HAVE_OPENSSL_RNG) if (len > 0 && len < INT_MAX) return RAND_bytes((unsigned char *) buf, (int) len); return -1; #endif }