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/*
* Copyright (C) 2012 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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.
*/
/*
* Copyright (C) 2012 Aleksandr Grinberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include "openssl_hmac.h"
#include <crypto/mac.h>
#include <crypto/prfs/mac_prf.h>
#include <crypto/signers/mac_signer.h>
typedef struct private_mac_t private_mac_t;
/**
* Private data of a mac_t object.
*/
struct private_mac_t {
/**
* Public interface
*/
mac_t public;
/**
* Hasher to use
*/
const EVP_MD *hasher;
/**
* Current HMAC context
*/
HMAC_CTX hmac;
};
/**
* Resets HMAC context
*/
static bool reset(private_mac_t *this)
{
return HMAC_Init_ex(&this->hmac, NULL, 0, this->hasher, NULL);
}
METHOD(mac_t, get_mac, bool,
private_mac_t *this, chunk_t data, u_int8_t *out)
{
if (out == NULL)
{
return HMAC_Update(&this->hmac, data.ptr, data.len);
}
return HMAC_Update(&this->hmac, data.ptr, data.len) &&
HMAC_Final(&this->hmac, out, NULL) &&
reset(this);
}
METHOD(mac_t, get_mac_size, size_t,
private_mac_t *this)
{
return EVP_MD_size(this->hasher);
}
METHOD(mac_t, set_key, bool,
private_mac_t *this, chunk_t key)
{
return HMAC_Init_ex(&this->hmac, key.ptr, key.len, this->hasher, NULL);
}
METHOD(mac_t, destroy, void,
private_mac_t *this)
{
HMAC_CTX_cleanup(&this->hmac);
free(this);
}
/*
* Create an OpenSSL-backed implementation of the mac_t interface
*/
static mac_t *hmac_create(hash_algorithm_t algo)
{
private_mac_t *this;
INIT(this,
.public = {
.get_mac = _get_mac,
.get_mac_size = _get_mac_size,
.set_key = _set_key,
.destroy = _destroy,
},
);
switch (algo)
{
case HASH_MD5:
this->hasher = EVP_get_digestbyname("md5");
break;
case HASH_SHA1:
this->hasher = EVP_get_digestbyname("sha1");
break;
case HASH_SHA256:
this->hasher = EVP_get_digestbyname("sha256");
break;
case HASH_SHA384:
this->hasher = EVP_get_digestbyname("sha384");
break;
case HASH_SHA512:
this->hasher = EVP_get_digestbyname("sha512");
break;
default:
break;
}
if (!this->hasher)
{
free(this);
return NULL;
}
HMAC_CTX_init(&this->hmac);
if (!HMAC_Init_ex(&this->hmac, NULL, 0, this->hasher, NULL))
{
destroy(this);
return NULL;
}
return &this->public;
}
/*
* Described in header
*/
prf_t *openssl_hmac_prf_create(pseudo_random_function_t algo)
{
mac_t *hmac;
hmac = hmac_create(hasher_algorithm_from_prf(algo));
if (hmac)
{
return mac_prf_create(hmac);
}
return NULL;
}
/*
* Described in header
*/
signer_t *openssl_hmac_signer_create(integrity_algorithm_t algo)
{
mac_t *hmac;
size_t trunc;
hmac = hmac_create(hasher_algorithm_from_integrity(algo, &trunc));
if (hmac)
{
return mac_signer_create(hmac, trunc);
}
return NULL;
}
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