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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"
typedef struct {
jose_io_t io;
jose_io_t *next;
EVP_MD_CTX *emc;
} io_t;
static bool
hsh_feed(jose_io_t *io, const void *in, size_t len)
{
io_t *i = containerof(io, io_t, io);
return EVP_DigestUpdate(i->emc, in, len) > 0;
}
static bool
hsh_done(jose_io_t *io)
{
io_t *i = containerof(io, io_t, io);
uint8_t hsh[EVP_MD_CTX_size(i->emc)];
unsigned int l = 0;
if (EVP_DigestFinal(i->emc, hsh, &l) <= 0)
return SIZE_MAX;
if (!i->next->feed(i->next, hsh, l) || !i->next->done(i->next))
return SIZE_MAX;
return l;
}
static void
hsh_free(jose_io_t *io)
{
io_t *i = containerof(io, io_t, io);
jose_io_decref(i->next);
EVP_MD_CTX_free(i->emc);
free(i);
}
static jose_io_t *
hsh(const jose_hook_alg_t *alg, jose_cfg_t *cfg, jose_io_t *next)
{
jose_io_auto_t *io = NULL;
const EVP_MD *md = NULL;
io_t *i = NULL;
switch (str2enum(alg->name, "S512", "S384", "S256", "S224", "S1", NULL)) {
case 0: md = EVP_sha512(); break;
case 1: md = EVP_sha384(); break;
case 2: md = EVP_sha256(); break;
case 3: md = EVP_sha224(); break;
case 4: md = EVP_sha1(); break;
}
i = calloc(1, sizeof(*i));
if (!i)
return NULL;
io = jose_io_incref(&i->io);
io->feed = hsh_feed;
io->done = hsh_done;
io->free = hsh_free;
i->next = jose_io_incref(next);
i->emc = EVP_MD_CTX_new();
if (!i->next || !i->emc)
return NULL;
if (EVP_DigestInit(i->emc, md) <= 0)
return NULL;
return jose_io_incref(io);
}
static void __attribute__((constructor))
constructor(void)
{
static jose_hook_alg_t algs[] = {
{ .kind = JOSE_HOOK_ALG_KIND_HASH, .name = "S512",
.hash.size = 64, .hash.hsh = hsh },
{ .kind = JOSE_HOOK_ALG_KIND_HASH, .name = "S384",
.hash.size = 48, .hash.hsh = hsh },
{ .kind = JOSE_HOOK_ALG_KIND_HASH, .name = "S256",
.hash.size = 32, .hash.hsh = hsh },
{ .kind = JOSE_HOOK_ALG_KIND_HASH, .name = "S224",
.hash.size = 28, .hash.hsh = hsh },
{ .kind = JOSE_HOOK_ALG_KIND_HASH, .name = "S1",
.hash.size = 20, .hash.hsh = hsh },
{}
};
for (size_t i = 0; algs[i].name; i++)
jose_hook_alg_push(&algs[i]);
}
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