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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "rng.h"
ENUM(rng_quality_names, RNG_WEAK, RNG_TRUE,
"RNG_WEAK",
"RNG_STRONG",
"RNG_TRUE",
);
/*
* Described in header.
*/
bool rng_get_bytes_not_zero(rng_t *rng, size_t len, uint8_t *buffer, bool all)
{
uint8_t *pos = buffer, *check = buffer + (all ? len : min(1, len));
if (!rng->get_bytes(rng, len, pos))
{
return FALSE;
}
for (; pos < check; pos++)
{
while (*pos == 0)
{
if (!rng->get_bytes(rng, 1, pos))
{
return FALSE;
}
}
}
return TRUE;
}
/*
* Described in header.
*/
bool rng_allocate_bytes_not_zero(rng_t *rng, size_t len, chunk_t *chunk,
bool all)
{
*chunk = chunk_alloc(len);
if (!rng_get_bytes_not_zero(rng, len, chunk->ptr, all))
{
chunk_clear(chunk);
return FALSE;
}
return TRUE;
}
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