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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 "ntru_plugin.h"
#include "ntru_ke.h"
#include <library.h>
#include <utils/debug.h>
typedef struct private_ntru_plugin_t private_ntru_plugin_t;
rng_t *rng;
bool ntru_plugin_get_entropy(ENTROPY_CMD cmd, uint8_t *out)
{
switch (cmd)
{
case INIT:
return TRUE;
case GET_NUM_BYTES_PER_BYTE_OF_ENTROPY:
/* Here we return the number of bytes needed from the entropy
* source to obtain 8 bits of entropy. Maximum is 8.
*/
if (!out)
{
return FALSE;
}
*out = 1; /* this is a perfectly random source */
return TRUE;
case GET_BYTE_OF_ENTROPY:
if (!out)
{
return FALSE;
}
if (!rng || !rng->get_bytes(rng, 1, out))
{
return FALSE;
}
DBG2(DBG_LIB, "read one byte of entropy");
return TRUE;
default:
return FALSE;
}
}
/**
* Create/Destroy True Random Generator
*/
static bool create_random(private_ntru_plugin_t *this,
plugin_feature_t *feature, bool reg, void *data)
{
if (reg)
{
rng = lib->crypto->create_rng(lib->crypto, RNG_TRUE);
if (!rng)
{
return FALSE;
}
}
else
{
rng->destroy(rng);
}
return TRUE;
}
/**
* private data of ntru_plugin
*/
struct private_ntru_plugin_t {
/**
* public functions
*/
ntru_plugin_t public;
};
METHOD(plugin_t, get_name, char*,
private_ntru_plugin_t *this)
{
return "ntru";
}
METHOD(plugin_t, get_features, int,
private_ntru_plugin_t *this, plugin_feature_t *features[])
{
int count = 0;
static plugin_feature_t f_ke[] = {
PLUGIN_REGISTER(DH, ntru_ke_create),
PLUGIN_PROVIDE(DH, NTRU_112_BIT),
PLUGIN_PROVIDE(DH, NTRU_128_BIT),
PLUGIN_PROVIDE(DH, NTRU_192_BIT),
PLUGIN_PROVIDE(DH, NTRU_256_BIT),
};
static plugin_feature_t f_rng[] = {
PLUGIN_CALLBACK((plugin_feature_callback_t)create_random, NULL),
PLUGIN_PROVIDE(CUSTOM, "ntru-rng"),
PLUGIN_DEPENDS(RNG, RNG_TRUE),
};
static plugin_feature_t f[countof(f_ke) + countof(f_rng)] = {};
plugin_features_add(f, f_ke, countof(f_ke), &count);
plugin_features_add(f, f_rng, countof(f_rng), &count);
*features = f;
return count;
}
METHOD(plugin_t, destroy, void,
private_ntru_plugin_t *this)
{
free(this);
}
/*
* see header file
*/
plugin_t *ntru_plugin_create()
{
private_ntru_plugin_t *this;
INIT(this,
.public = {
.plugin = {
.get_name = _get_name,
.get_features = _get_features,
.destroy = _destroy,
},
},
);
return &this->public.plugin;
}
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