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/**
* Matrix end-to-end encryption support
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include "libmatrix.h"
#include "matrix-e2e.h"
#include "matrix-json.h"
#include "connection.h"
#ifndef MATRIX_NO_E2E
#include "olm/olm.h"
struct _MatrixE2EData {
OlmAccount *oa;
gchar *device_id;
};
/* Sign the JsonObject with olm_account_sign and add it to the object
* as a 'signatures' member of the top level object.
* 0 on success
*/
int matrix_sign_json(MatrixConnectionData *conn, JsonObject *tosign)
{
int ret = -1;
OlmAccount *account = conn->e2e->oa;
const gchar *device_id = conn->e2e->device_id;
PurpleConnection *pc = conn->pc;
GString *can_json = matrix_canonical_json(tosign);
gchar *can_json_c = g_string_free(can_json, FALSE);
size_t sig_length = olm_account_signature_length(account);
gchar *sig = g_malloc0(sig_length+1);
if (olm_account_sign(account, can_json_c, strlen(can_json_c),
sig, sig_length)==olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(account));
goto out;
}
/* We need to add a "signatures" member which is an object, with
* a "user_id" member that is itself an object which has an "ed25519:$DEVICEID" member
* that is the signature.
*/
GString *alg_dev = g_string_new(NULL);
g_string_printf(alg_dev, "ed25519:%s", device_id);
gchar *alg_dev_c = g_string_free(alg_dev, FALSE);
JsonObject *sig_dev = json_object_new();
json_object_set_string_member(sig_dev, alg_dev_c, sig);
JsonObject *sig_obj = json_object_new();
json_object_set_object_member(sig_obj, conn->user_id, sig_dev);
json_object_set_object_member(tosign, "signatures", sig_obj);
g_free(alg_dev_c);
ret = 0;
out:
g_free(can_json_c);
g_free(sig);
return ret;
}
#else
/* ==== Stubs for when e2e is configured out of the build === */
#endif
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