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/**
* @file hmac_prf.c
*
* @brief Implementation for hmac_prf_t.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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.
*/
#include "hmac_prf.h"
#include <utils/allocator.h>
#include <crypto/hmac.h>
typedef struct private_hmac_prf_t private_hmac_prf_t;
/**
* Private data of a hma_prf_t object.
*/
struct private_hmac_prf_t {
/**
* Public hmac_prf_t interface.
*/
hmac_prf_t public;
/**
* Hmac to use for generation.
*/
hmac_t *hmac;
};
/**
* Implementation of prf_t.get_bytes.
*/
static void get_bytes(private_hmac_prf_t *this, chunk_t seed, u_int8_t *buffer)
{
this->hmac->get_mac(this->hmac, seed, buffer);
}
/**
* Implementation of prf_t.allocate_bytes.
*/
static void allocate_bytes(private_hmac_prf_t *this, chunk_t seed, chunk_t *chunk)
{
this->hmac->allocate_mac(this->hmac, seed, chunk);
}
/**
* Implementation of prf_t.get_block_size.
*/
static size_t get_block_size(private_hmac_prf_t *this)
{
return this->hmac->get_block_size(this->hmac);
}
/**
* Implementation of prf_t.get_block_size.
*/
static size_t get_key_size(private_hmac_prf_t *this)
{
/* for HMAC prfs, IKEv2 uses block size as key size */
return this->hmac->get_block_size(this->hmac);
}
/**
* Implementation of prf_t.set_key.
*/
static void set_key(private_hmac_prf_t *this, chunk_t key)
{
this->hmac->set_key(this->hmac, key);
}
/**
* Implementation of prf_t.destroy.
*/
static void destroy(private_hmac_prf_t *this)
{
allocator_free(this);
this->hmac->destroy(this->hmac);
}
/*
* Described in header.
*/
hmac_prf_t *hmac_prf_create(hash_algorithm_t hash_algorithm)
{
private_hmac_prf_t *this = allocator_alloc_thing(private_hmac_prf_t);
this->public.prf_interface.get_bytes = (void (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
this->public.prf_interface.allocate_bytes = (void (*) (prf_t*,chunk_t,chunk_t*))allocate_bytes;
this->public.prf_interface.get_block_size = (size_t (*) (prf_t*))get_block_size;
this->public.prf_interface.get_key_size = (size_t (*) (prf_t*))get_key_size;
this->public.prf_interface.set_key = (void (*) (prf_t *,chunk_t))set_key;
this->public.prf_interface.destroy = (void (*) (prf_t *))destroy;
this->hmac = hmac_create(hash_algorithm);
if (this->hmac == NULL)
{
allocator_free(this);
return NULL;
}
return &(this->public);
}
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