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/*
* Hash algorithms, for libreswan
*
* Copyright (C) 2016-2019 Andrew Cagney <cagney@gnu.org>
* Copyright (C) 2019 D. Hugh Redelmeier <hugh@mimosa.com>
*
* 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. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*/
#include <stdlib.h>
#include "lswalloc.h"
#include "lswlog.h"
#include "ike_alg.h"
#include "ike_alg_hash_ops.h"
#include "crypt_hash.h"
#include "crypt_symkey.h"
struct crypt_hash {
struct hash_context *context;
const char *name;
const struct hash_desc *desc;
struct logger *logger;
};
struct crypt_hash *crypt_hash_init(const char *name, const struct hash_desc *hash_desc,
struct logger *logger)
{
ldbgf(DBG_CRYPT, logger, "%s hash %s init",
name, hash_desc->common.fqn);
struct hash_context *context =
hash_desc->hash_ops->init(hash_desc, name);
if (context == NULL) {
return NULL;
}
struct crypt_hash hash = {
.context = context,
.name = name,
.desc = hash_desc,
.logger = logger,
};
return clone_thing(hash, name);
}
void crypt_hash_digest_symkey(struct crypt_hash *hash,
const char *name, PK11SymKey *symkey)
{
if (DBGP(DBG_CRYPT)) {
DBG_log("%s hash %s digest %s-key@%p (size %zu)",
hash->name, hash->desc->common.fqn,
name, symkey, sizeof_symkey(symkey));
LDBG_symkey(hash->logger, hash->name, name, symkey);
}
hash->desc->hash_ops->digest_symkey(hash->context, name, symkey);
}
void crypt_hash_digest_byte(struct crypt_hash *hash,
const char *name, uint8_t byte)
{
if (DBGP(DBG_CRYPT)) {
DBG_log("%s hash %s digest %s 0x%"PRIx8" (%"PRIu8")",
hash->name, hash->desc->common.fqn,
name, byte, byte);
DBG_dump_thing(NULL, byte);
}
hash->desc->hash_ops->digest_bytes(hash->context, name, &byte, 1);
}
void crypt_hash_digest_bytes(struct crypt_hash *hash,
const char *name,
const void *bytes,
size_t sizeof_bytes)
{
if (DBGP(DBG_CRYPT)) {
/*
* XXX: don't log BYTES using @POINTER syntax as it
* might be bogus - confusing refcnt.awk.
*/
DBG_log("%s hash %s digest %s (%p length %zu)",
hash->name, hash->desc->common.fqn,
name, bytes, sizeof_bytes);
DBG_dump(NULL, bytes, sizeof_bytes);
}
hash->desc->hash_ops->digest_bytes(hash->context, name, bytes, sizeof_bytes);
}
void crypt_hash_final_bytes(struct crypt_hash **hashp,
uint8_t *bytes, size_t sizeof_bytes)
{
struct crypt_hash *hash = *hashp;
/* Must be correct, else hash code can crash. */
passert(sizeof_bytes == hash->desc->hash_digest_size);
hash->desc->hash_ops->final_bytes(&hash->context, bytes, sizeof_bytes);
if (DBGP(DBG_CRYPT)) {
DBG_log("%s hash %s final bytes@%p (length %zu)",
hash->name, hash->desc->common.fqn,
bytes, sizeof_bytes);
DBG_dump(NULL, bytes, sizeof_bytes);
}
pfree(*hashp);
*hashp = hash = NULL;
}
struct crypt_mac crypt_hash_final_mac(struct crypt_hash **hashp)
{
struct crypt_hash *hash = *hashp;
struct crypt_mac output = { .len = hash->desc->hash_digest_size, };
passert(output.len <= sizeof(output.ptr/*array*/));
hash->desc->hash_ops->final_bytes(&hash->context, output.ptr, output.len);
if (DBGP(DBG_CRYPT)) {
DBG_log("%s hash %s final length %zu",
hash->name, hash->desc->common.fqn, output.len);
DBG_dump_hunk(NULL, output);
}
pfree(*hashp);
*hashp = hash = NULL;
return output;
}
PK11SymKey *crypt_hash_symkey(const char *name, const struct hash_desc *hash_desc,
const char *symkey_name, PK11SymKey *symkey,
struct logger *logger)
{
ldbgf(DBG_CRYPT, logger, "%s hash %s %s-key@%p (size %zu)",
name, hash_desc->common.fqn,
symkey_name, symkey, sizeof_symkey(symkey));
struct crypt_hash *hash = crypt_hash_init(name, hash_desc, logger);
crypt_hash_digest_symkey(hash, symkey_name, symkey);
struct crypt_mac out = crypt_hash_final_mac(&hash);
PK11SymKey *key = symkey_from_hunk(name, out, logger);
return key;
}
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