115 lines
2.3 KiB
C
115 lines
2.3 KiB
C
/*
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* Copyright (C) 2005-2008 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <utils/debug.h>
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#include "random_rng.h"
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#include "random_plugin.h"
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typedef struct private_random_rng_t private_random_rng_t;
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/**
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* Private data of an random_rng_t object.
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*/
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struct private_random_rng_t {
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/**
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* Public random_rng_t interface.
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*/
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random_rng_t public;
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/**
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* random device, depends on quality
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*/
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int fd;
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};
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METHOD(rng_t, get_bytes, bool,
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private_random_rng_t *this, size_t bytes, u_int8_t *buffer)
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{
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size_t done;
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ssize_t got;
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done = 0;
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while (done < bytes)
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{
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got = read(this->fd, buffer + done, bytes - done);
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if (got <= 0)
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{
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DBG1(DBG_LIB, "reading from random FD %d failed: %s, retrying...",
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this->fd, strerror(errno));
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sleep(1);
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}
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done += got;
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}
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return TRUE;
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}
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METHOD(rng_t, allocate_bytes, bool,
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private_random_rng_t *this, size_t bytes, chunk_t *chunk)
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{
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*chunk = chunk_alloc(bytes);
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get_bytes(this, chunk->len, chunk->ptr);
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return TRUE;
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}
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METHOD(rng_t, destroy, void,
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private_random_rng_t *this)
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{
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free(this);
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}
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/*
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* Described in header.
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*/
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random_rng_t *random_rng_create(rng_quality_t quality)
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{
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private_random_rng_t *this;
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INIT(this,
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.public = {
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.rng = {
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.get_bytes = _get_bytes,
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.allocate_bytes = _allocate_bytes,
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.destroy = _destroy,
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},
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},
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);
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switch (quality)
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{
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case RNG_TRUE:
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this->fd = random_plugin_get_dev_random();
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break;
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case RNG_STRONG:
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this->fd = random_plugin_get_strong_equals_true() ?
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random_plugin_get_dev_random() :
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random_plugin_get_dev_urandom();
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break;
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case RNG_WEAK:
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default:
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this->fd = random_plugin_get_dev_urandom();
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break;
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}
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return &this->public;
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}
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