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/*
This file is part of GNUnet
Copyright (C) 2010-2015 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 reclaim/did_helper.c
* @brief helper library for DID related functions
* @author Tristan Schwieren
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_namestore_service.h"
#include "gnunet_gns_service.h"
#include "gnunet_gnsrecord_lib.h"
#include "did_helper.h"
#include "jansson.h"
#define STR_INDIR(x) #x
#define STR(x) STR_INDIR (x)
/**
* @brief Generate a DID for a given GNUNET public key
*
* @param pkey
* @return char* Returns the DID. Caller must free
* TODO: Check if EdDSA
*/
char*
DID_pkey_to_did (struct GNUNET_IDENTITY_PublicKey *pkey)
{
char *pkey_str;
char *did_str;
pkey_str = GNUNET_IDENTITY_public_key_to_string (pkey);
GNUNET_asprintf (&did_str, "%s%s",
GNUNET_DID_METHOD_PREFIX,
pkey_str);
GNUNET_free (pkey_str);
return did_str;
}
/**
* @brief Generate a DID for a given gnunet EGO.
* Wrapper around GNUNET_DID_pkey_to_did
*
* @param ego
* @return char* Returns the DID. Caller must free
*/
char*
DID_identity_to_did (struct GNUNET_IDENTITY_Ego *ego)
{
struct GNUNET_IDENTITY_PublicKey pkey;
GNUNET_IDENTITY_ego_get_public_key (ego, &pkey);
return DID_pkey_to_did (&pkey);
}
/**
* @brief Return the public key of a DID
*/
enum GNUNET_GenericReturnValue
DID_did_to_pkey (const char *did, struct GNUNET_IDENTITY_PublicKey *pkey)
{
/* FIXME-MSC: I suggest introducing a
* #define MAX_DID_LENGTH <something>
* here and use it for parsing
*/
char pkey_str[MAX_DID_SPECIFIC_IDENTIFIER_LENGTH];
if ((1 != (sscanf (did,
GNUNET_DID_METHOD_PREFIX "%"
STR (MAX_DID_SPECIFIC_IDENTIFIER_LENGTH)
"s", pkey_str))) ||
(GNUNET_OK != GNUNET_IDENTITY_public_key_from_string (pkey_str, pkey)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Could not decode given DID: %s\n",
did);
return GNUNET_NO;
}
return GNUNET_OK;
}
/**
* @brief Convert a base 64 encoded public key to a GNUNET key
*/
struct GNUNET_IDENTITY_PublicKey *
GNUNET_DID_key_covert_multibase_base64_to_gnunet (char *pkey_str)
{
return NULL;
}
/**
* @brief Convert GNUNET key to a base 64 encoded public key
*/
char *
DID_key_covert_gnunet_to_multibase_base64 (struct
GNUNET_IDENTITY_PublicKey *
pkey)
{
struct GNUNET_CRYPTO_EddsaPublicKey pubkey = pkey->eddsa_key;
// This is how to convert out pubkeys to W3c Ed25519-2020 multibase (base64url no padding)
char *pkey_base_64;
char *pkey_multibase;
char pkx[34];
pkx[0] = 0xed;
pkx[1] = 0x01;
memcpy (pkx + 2, &pubkey, sizeof (pubkey));
GNUNET_STRINGS_base64url_encode (pkx, sizeof (pkx), &pkey_base_64);
GNUNET_asprintf (&pkey_multibase, "u%s", pkey_base_64);
GNUNET_free (pkey_base_64);
return pkey_multibase;
}
/**
* @brief Create a did generate did object
*
* @param pkey
* @return void* Return pointer to the DID Document
*/
char *
DID_pkey_to_did_document (struct GNUNET_IDENTITY_PublicKey *pkey)
{
/* FIXME-MSC: This is effectively creating a DID Document default template for
* the initial document.
* Maybe this can be refactored to generate such a template for an identity?
* Even if higher layers add/modify it, there should probably still be a
* GNUNET_DID_document_template_from_identity()
*/
char *did_str;
char *verify_id_str;
char *pkey_multibase_str;
char *didd_str;
json_t *didd_json;
did_str = DID_pkey_to_did (pkey);
GNUNET_asprintf (&verify_id_str, "%s#key-1", did_str);
pkey_multibase_str = DID_key_covert_gnunet_to_multibase_base64 (pkey);
didd_json = json_pack (
"{s:[ss], s:s, s:[{s:s, s:s, s:s, s:s}], s:[s], s:[s]}",
"@context",
"https://www.w3.org/ns/did/v1",
"https://w3id.org/security/suites/ed25519-2020/v1",
"id",
did_str,
"verificationMethod",
"id",
verify_id_str,
"type",
"Ed25519VerificationKey2020",
"controller",
did_str,
"publicKeyMultibase",
pkey_multibase_str,
"authentication",
"#key-1",
"assertionMethod",
"#key-1");
// Encode DID Document as JSON string
didd_str = json_dumps (didd_json, JSON_INDENT (2));
// Free
GNUNET_free (did_str);
GNUNET_free (verify_id_str);
GNUNET_free (pkey_multibase_str);
json_decref (didd_json);
return didd_str;
}
/**
* @brief Generate the default DID document for a GNUNET ego
* Wrapper around GNUNET_DID_pkey_to_did_document
*/
char *
DID_identity_to_did_document (struct GNUNET_IDENTITY_Ego *ego)
{
struct GNUNET_IDENTITY_PublicKey pkey;
GNUNET_IDENTITY_ego_get_public_key (ego, &pkey);
return DID_pkey_to_did (&pkey);
}
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