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56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
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Serval Distributed Numbering Architecture (DNA)
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Copyright (C) 2010 Paul Gardner-Stephen
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* it's really stupid that there isn't a syscall for this */
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static int fd = -1;
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void randombytes(unsigned char *x,unsigned long long xlen)
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{
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int i;
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if (fd == -1) {
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for (;;) {
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fd = open("/dev/urandom",O_RDONLY);
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if (fd != -1) break;
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sleep(1);
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}
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}
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while (xlen > 0) {
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if (xlen < 1048576) i = xlen; else i = 1048576;
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i = read(fd,x,i);
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if (i < 1) {
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sleep(1);
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continue;
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}
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x += i;
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xlen -= i;
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}
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}
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