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/* vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80: */
/*
* Copyright 2016 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "misc.h"
#include "../hooks.h"
#include <string.h>
static const char *
alg_wrap_alg(const jose_hook_alg_t *alg, jose_cfg_t *cfg, const json_t *jwk)
{
const char *enc = NULL;
if (json_unpack((json_t *) jwk, "{s:s}", "alg", &enc) == -1)
return NULL;
for (const jose_hook_alg_t *a = jose_hook_alg_list(); a; a = a->next) {
if (a->kind != JOSE_HOOK_ALG_KIND_ENCR)
continue;
if (strcmp(a->name, enc) == 0)
return "dir";
}
return NULL;
}
static const char *
alg_wrap_enc(const jose_hook_alg_t *alg, jose_cfg_t *cfg, const json_t *jwk)
{
const char *enc = NULL;
if (json_unpack((json_t *) jwk, "{s:s}", "alg", &enc) == -1)
return NULL;
for (const jose_hook_alg_t *a = jose_hook_alg_list(); a; a = a->next) {
if (a->kind != JOSE_HOOK_ALG_KIND_ENCR)
continue;
if (strcmp(a->name, enc) == 0)
return a->name;
}
return NULL;
}
static bool
copy(json_t *to, const json_t *from)
{
json_auto_t *cpy = NULL;
cpy = json_deep_copy(from);
return json_object_update(to, cpy) == 0;
}
static bool
alg_wrap_wrp(const jose_hook_alg_t *alg, jose_cfg_t *cfg, json_t *jwe,
json_t *rcp, const json_t *jwk, json_t *cek)
{
if (!json_object_get(cek, "k") && !copy(cek, jwk))
return false;
if (json_object_set_new(rcp, "encrypted_key", json_string("")) < 0)
return false;
return add_entity(jwe, rcp, "recipients", "header", "encrypted_key", NULL);
}
static bool
alg_wrap_unw(const jose_hook_alg_t *alg, jose_cfg_t *cfg, const json_t *jwe,
const json_t *rcp, const json_t *jwk, json_t *cek)
{
return copy(cek, jwk);
}
static void __attribute__((constructor))
constructor(void)
{
static jose_hook_alg_t algs[] = {
{ .kind = JOSE_HOOK_ALG_KIND_WRAP,
.name = "dir",
.wrap.eprm = "encrypt",
.wrap.dprm = "decrypt",
.wrap.alg = alg_wrap_alg,
.wrap.enc = alg_wrap_enc,
.wrap.wrp = alg_wrap_wrp,
.wrap.unw = alg_wrap_unw },
{}
};
for (size_t i = 0; algs[i].name; i++)
jose_hook_alg_push(&algs[i]);
}
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