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/*
This file is part of GNUnet
Copyright (C) 2020 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file escrow/plugin_escrow_gns.c
* @brief escrow-plugin-gns escrow plugin for the escrow of the key
* using GNS and escrow identities
*
* @author Johannes Späth
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_escrow_plugin.h"
#include "escrow_plugin_helper.h"
#include <sss.h>
#include <inttypes.h>
#define GNUNET_ESCROW_GNS_NumberOfShares 6
#define GNUNET_ESCROW_GNS_ShareThreshold 3
/**
* Identity handle
*/
static struct GNUNET_IDENTITY_Handle *identity_handle;
/**
* Handle for the plugin instance
*/
struct EscrowPluginHandle ph;
/**
* Start the GNS escrow of the key
*
* @param ego the identity ego containing the private key
* @return the escrow anchor needed to restore the key
*/
void *
start_gns_key_escrow (const struct GNUNET_IDENTITY_Ego *ego)
{
const struct GNUNET_CRYPTO_EcdsaPrivateKey *pk;
sss_Keyshare keyshares;
void *escrowAnchor;
if (NULL == ego)
{
return GNUNET_NO;
}
pk = GNUNET_IDENTITY_ego_get_private_key (ego);
// split the private key (SSS)
sss_create_keyshares(keyshares,
pk,
GNUNET_ESCROW_GNS_NumberOfShares,
GNUNET_ESCROW_GNS_ShareThreshold);
// create the escrow identities
// distribute the shares to the identities
// TODO: implement
return escrowAnchor;
}
/**
* Renew the GNS escrow of the key
*
* @param escrowAnchor the the escrow anchor returned by the start method
* @return the escrow anchor needed to restore the key
*/
void *
renew_gns_key_escrow (void *escrowAnchor)
{
// TODO: implement
return NULL;
}
/**
* Verify the GNS escrow of the key
*
* @param ego the identity ego containing the private key
* @param escrowAnchor the escrow anchor needed to restore the key
* @return GNUNET_ESCROW_VALID if the escrow could successfully by restored,
* GNUNET_ESCROW_RENEW_NEEDED if the escrow needs to be renewed,
* GNUNET_ESCROW_INVALID otherwise
*/
int
verify_gns_key_escrow (const struct GNUNET_IDENTITY_Ego *ego,
void *escrowAnchor)
{
// TODO: implement
return GNUNET_ESCROW_INVALID;
}
/**
* Restore the key from GNS escrow
*
* @param escrowAnchor the escrow anchor needed to restore the key
* @param egoName the name of the ego to restore
* @return the identity ego containing the private key
*/
const struct GNUNET_IDENTITY_Ego *
restore_gns_key_escrow (void *escrowAnchor,
char *egoName)
{
// TODO: implement
return NULL;
}
/**
* Deserialize an escrow anchor string into a GNUNET_ESCROW_Anchor struct
*
* @param anchorString the encoded escrow anchor string
* @return the deserialized data packed into a GNUNET_ESCROW_Anchor struct
*/
const struct GNUNET_ESCROW_Anchor *
gns_anchor_string_to_data (char *anchorString)
{
struct GNUNET_ESCROW_Anchor *anchor;
uint32_t data_size;
data_size = strlen (anchorString) + 1;
anchor = GNUNET_malloc (sizeof (struct GNUNET_ESCROW_Anchor) + data_size);
anchor->size = data_size;
// TODO: deserialize?
GNUNET_memcpy (&anchor[1], anchorString, data_size);
return anchor;
}
/**
* ContinueIdentityInitFunction for the GNS plugin
*/
void
gns_cont_init ()
{
return;
}
/**
* Entry point for the plugin.
*
* @param cls Config info
* @return the exported block API
*/
void *
libgnunet_plugin_escrow_gns_init (void *cls)
{
struct GNUNET_ESCROW_KeyPluginFunctions *api;
struct GNUNET_CONFIGURATION_Handle *cfg = cls;
api = GNUNET_new (struct GNUNET_ESCROW_KeyPluginFunctions);
api->start_key_escrow = &start_gns_key_escrow;
api->renew_key_escrow = &renew_gns_key_escrow;
api->verify_key_escrow = &verify_gns_key_escrow;
api->restore_key = &restore_gns_key_escrow;
api->anchor_string_to_data = &gns_anchor_string_to_data;
ph.cont = &gns_cont_init;
identity_handle = GNUNET_IDENTITY_connect (cfg,
&GNUNET_ESCROW_list_ego,
&ph);
return api;
}
/**
* Exit point from the plugin.
*
* @param cls the return value from #libgnunet_plugin_block_test_init()
* @return NULL
*/
void *
libgnunet_plugin_escrow_gns_done (void *cls)
{
struct GNUNET_RECLAIM_EscrowKeyPluginFunctions *api = cls;
GNUNET_free (api);
GNUNET_IDENTITY_disconnect (identity_handle);
GNUNET_ESCROW_cleanup_ego_list (&ph);
return NULL;
}
/* end of plugin_escrow_gns.c */
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