91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/**
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* @file BRandom2.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <unistd.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 "BRandom2.h"
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static int do_init (BRandom2 *o)
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{
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if (o->initialized) {
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return 1;
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}
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o->urandom_fd = open("/dev/urandom", O_RDONLY);
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if (o->urandom_fd < 0) {
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return 0;
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}
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o->initialized = 1;
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return 1;
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}
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int BRandom2_Init (BRandom2 *o, int flags)
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{
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ASSERT((flags & ~(BRANDOM2_INIT_LAZY)) == 0)
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o->initialized = 0;
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if (!(flags & BRANDOM2_INIT_LAZY) && !do_init(o)) {
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return 0;
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}
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DebugObject_Init(&o->d_obj);
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return 1;
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}
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void BRandom2_Free (BRandom2 *o)
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{
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DebugObject_Free(&o->d_obj);
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if (o->initialized) {
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close(o->urandom_fd);
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}
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}
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int BRandom2_GenBytes (BRandom2 *o, void *out, size_t len)
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{
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DebugObject_Access(&o->d_obj);
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if (!do_init(o)) {
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return 0;
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}
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ssize_t res = read(o->urandom_fd, out, len);
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if (res < 0 || res != len) {
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return 0;
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}
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return 1;
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}
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