109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/**
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* @file hmac_prf.c
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*
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* @brief Implementation for hmac_prf_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "hmac_prf.h"
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#include <utils/allocator.h>
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#include <transforms/hmac.h>
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typedef struct private_hmac_prf_t private_hmac_prf_t;
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/**
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* Private data of a hma_prf_t object.
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*/
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struct private_hmac_prf_t {
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/**
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* Public hmac_prf_t interface.
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*/
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hmac_prf_t public;
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/**
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* Hmac to use for generation.
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*/
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hmac_t *hmac;
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};
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/**
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* Implementation of prf_t.get_bytes.
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*/
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static void get_bytes(private_hmac_prf_t *this, chunk_t seed, u_int8_t *buffer)
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{
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this->hmac->get_mac(this->hmac, seed, buffer);
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}
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/**
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* Implementation of prf_t.allocate_bytes.
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*/
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static void allocate_bytes(private_hmac_prf_t *this, chunk_t seed, chunk_t *chunk)
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{
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this->hmac->allocate_mac(this->hmac, seed, chunk);
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}
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/**
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* Implementation of prf_t.get_block_size.
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*/
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static size_t get_block_size(private_hmac_prf_t *this)
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{
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return this->hmac->get_block_size(this->hmac);
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}
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/**
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* Implementation of prf_t.set_key.
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*/
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static void set_key(private_hmac_prf_t *this, chunk_t key)
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{
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this->hmac->set_key(this->hmac, key);
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}
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/**
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* Implementation of prf_t.destroy.
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*/
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static void destroy(private_hmac_prf_t *this)
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{
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allocator_free(this);
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this->hmac->destroy(this->hmac);
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}
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/*
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* Described in header.
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*/
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hmac_prf_t *hmac_prf_create(hash_algorithm_t hash_algorithm)
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{
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private_hmac_prf_t *this = allocator_alloc_thing(private_hmac_prf_t);
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this->public.prf_interface.get_bytes = (void (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
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this->public.prf_interface.allocate_bytes = (void (*) (prf_t*,chunk_t,chunk_t*))allocate_bytes;
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this->public.prf_interface.get_block_size = (size_t (*) (prf_t*))get_block_size;
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this->public.prf_interface.set_key = (void (*) (prf_t *,chunk_t))set_key;
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this->public.prf_interface.destroy = (void (*) (prf_t *))destroy;
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this->hmac = hmac_create(hash_algorithm);
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if (this->hmac == NULL)
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{
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allocator_free(this);
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return NULL;
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}
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return &(this->public);
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}
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