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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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 <http://www.fsf.org/copyleft/gpl.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 "af_alg_hasher.h"
#include "af_alg_ops.h"
typedef struct private_af_alg_hasher_t private_af_alg_hasher_t;
/**
* Private data of af_alg_hasher_t
*/
struct private_af_alg_hasher_t {
/**
* Public part of this class.
*/
af_alg_hasher_t public;
/**
* AF_ALG operations
*/
af_alg_ops_t *ops;
/**
* Size of the hash
*/
size_t size;
};
/**
* Algorithm database
*/
static struct {
hash_algorithm_t id;
char *name;
size_t size;
} algs[] = {
{HASH_SHA1, "sha1", HASH_SIZE_SHA1 },
{HASH_MD5, "md5", HASH_SIZE_MD5 },
{HASH_SHA224, "sha224", HASH_SIZE_SHA224 },
{HASH_SHA256, "sha256", HASH_SIZE_SHA256 },
{HASH_SHA384, "sha384", HASH_SIZE_SHA384 },
{HASH_SHA512, "sha512", HASH_SIZE_SHA512 },
{HASH_MD4, "md4", HASH_SIZE_MD4 },
};
/**
* See header.
*/
void af_alg_hasher_probe(char *plugin)
{
af_alg_ops_t *ops;
int i;
for (i = 0; i < countof(algs); i++)
{
ops = af_alg_ops_create("hash", algs[i].name);
if (ops)
{
ops->destroy(ops);
lib->crypto->add_hasher(lib->crypto, algs[i].id, plugin,
(hasher_constructor_t)af_alg_hasher_create);
}
}
}
/**
* Get the kernel algorithm string and hash size for our identifier
*/
static size_t lookup_alg(hash_algorithm_t algo, char **name)
{
int i;
for (i = 0; i < countof(algs); i++)
{
if (algs[i].id == algo)
{
*name = algs[i].name;
return algs[i].size;
}
}
return 0;
}
METHOD(hasher_t, get_hash_size, size_t,
private_af_alg_hasher_t *this)
{
return this->size;
}
METHOD(hasher_t, reset, void,
private_af_alg_hasher_t *this)
{
this->ops->reset(this->ops);
}
METHOD(hasher_t, get_hash, void,
private_af_alg_hasher_t *this, chunk_t chunk, u_int8_t *hash)
{
this->ops->hash(this->ops, chunk, hash, this->size);
}
METHOD(hasher_t, allocate_hash, void,
private_af_alg_hasher_t *this, chunk_t chunk, chunk_t *hash)
{
if (hash)
{
*hash = chunk_alloc(get_hash_size(this));
get_hash(this, chunk, hash->ptr);
}
else
{
get_hash(this, chunk, NULL);
}
}
METHOD(hasher_t, destroy, void,
private_af_alg_hasher_t *this)
{
this->ops->destroy(this->ops);
free(this);
}
/*
* Described in header
*/
af_alg_hasher_t *af_alg_hasher_create(hash_algorithm_t algo)
{
private_af_alg_hasher_t *this;
char *name;
size_t size;
size = lookup_alg(algo, &name);
if (!size)
{ /* not supported by kernel */
return NULL;
}
INIT(this,
.public = {
.hasher = {
.get_hash = _get_hash,
.allocate_hash = _allocate_hash,
.get_hash_size = _get_hash_size,
.reset = _reset,
.destroy = _destroy,
},
},
.ops = af_alg_ops_create("hash", name),
.size = size,
);
if (!this->ops)
{
free(this);
return NULL;
}
return &this->public;
}
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