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/*
* Copyright (C) 2013 Andreas Steffen
* HSR 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 "test_rng.h"
typedef struct private_rng_t private_rng_t;
/**
* Private data.
*/
struct private_rng_t {
/**
* Public interface.
*/
rng_t public;
/**
* Entropy string.
*/
chunk_t entropy;
};
METHOD(rng_t, get_bytes, bool,
private_rng_t *this, size_t bytes, uint8_t *buffer)
{
if (bytes > this->entropy.len)
{
return FALSE;
}
memcpy(buffer, this->entropy.ptr, bytes);
this->entropy = chunk_skip(this->entropy, bytes);
return TRUE;
}
METHOD(rng_t, allocate_bytes, bool,
private_rng_t *this, size_t bytes, chunk_t *chunk)
{
if (bytes > this->entropy.len)
{
*chunk = chunk_empty;
return FALSE;
}
*chunk = chunk_alloc(bytes);
memcpy(chunk->ptr, this->entropy.ptr, bytes);
this->entropy = chunk_skip(this->entropy, bytes);
return TRUE;
}
METHOD(rng_t, destroy, void,
private_rng_t *this)
{
free(this);
}
/*
* Described in header.
*/
rng_t *test_rng_create(chunk_t entropy)
{
private_rng_t *this;
INIT(this,
.public = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.destroy = _destroy,
},
.entropy = entropy,
);
return &this->public;
}
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