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/*
* Copyright (C) 2018 René Korthaus
* Rohde & Schwarz Cybersecurity GmbH
*
* 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 "botan_hmac.h"
#include <botan/build.h>
#ifdef BOTAN_HAS_HMAC
#include <crypto/mac.h>
#include <crypto/prfs/mac_prf.h>
#include <crypto/signers/mac_signer.h>
#include <botan/ffi.h>
typedef struct private_botan_mac_t private_botan_mac_t;
/**
* Private data of a mac_t object.
*/
struct private_botan_mac_t {
/**
* Public interface
*/
mac_t public;
/**
* HMAC
*/
botan_mac_t hmac;
};
METHOD(mac_t, set_key, bool,
private_botan_mac_t *this, chunk_t key)
{
if (botan_mac_set_key(this->hmac, key.ptr, key.len))
{
return FALSE;
}
return TRUE;
}
METHOD(mac_t, get_mac, bool,
private_botan_mac_t *this, chunk_t data, uint8_t *out)
{
if (botan_mac_update(this->hmac, data.ptr, data.len))
{
return FALSE;
}
if (out && botan_mac_final(this->hmac, out))
{
return FALSE;
}
return TRUE;
}
METHOD(mac_t, get_mac_size, size_t,
private_botan_mac_t *this)
{
size_t len = 0;
if (botan_mac_output_length(this->hmac, &len))
{
return 0;
}
return len;
}
METHOD(mac_t, destroy, void,
private_botan_mac_t *this)
{
botan_mac_destroy(this->hmac);
free(this);
}
/*
* Create a Botan-backed implementation of the mac_t interface
*/
static mac_t *hmac_create(hash_algorithm_t algo)
{
private_botan_mac_t *this;
const char* hmac_name;
switch (algo)
{
case HASH_SHA1:
hmac_name = "HMAC(SHA-1)";
break;
case HASH_SHA256:
hmac_name = "HMAC(SHA-256)";
break;
case HASH_SHA384:
hmac_name = "HMAC(SHA-384)";
break;
case HASH_SHA512:
hmac_name = "HMAC(SHA-512)";
break;
default:
return NULL;
}
INIT(this,
.public = {
.get_mac = _get_mac,
.get_mac_size = _get_mac_size,
.set_key = _set_key,
.destroy = _destroy,
}
);
if (botan_mac_init(&this->hmac, hmac_name, 0))
{
free(this);
return NULL;
}
return &this->public;
}
/*
* Described in header
*/
prf_t *botan_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 *botan_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;
}
#endif
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