113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/**
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* @file prf_hmac.c
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*
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* @brief Implementation of prf_t interface using the
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* a HMAC algorithm. This simply wraps a hmac in a prf.
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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 "prf_hmac.h"
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#include "../../utils/allocator.h"
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#include "../hmac.h"
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typedef struct private_prf_hmac_s private_prf_hmac_t;
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struct private_prf_hmac_s {
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/**
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* public interface for this prf
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*/
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prf_hmac_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 status_t get_bytes(private_prf_hmac_t *this, chunk_t seed, u_int8_t *buffer)
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{
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return 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 status_t allocate_bytes(private_prf_hmac_t *this, chunk_t seed, chunk_t *chunk)
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{
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return 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_prf_hmac_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 status_t set_key(private_prf_hmac_t *this, chunk_t key)
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{
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this->hmac->set_key(this->hmac, key);
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return SUCCESS;
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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 status_t destroy(private_prf_hmac_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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return SUCCESS;
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}
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/*
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* Described in header
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*/
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prf_hmac_t *prf_hmac_create(hash_algorithm_t hash_algorithm)
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{
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private_prf_hmac_t *this = allocator_alloc_thing(private_prf_hmac_t);
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if (this == NULL)
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{
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return NULL;
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}
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this->public.prf_interface.get_bytes = (status_t (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
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this->public.prf_interface.allocate_bytes = (status_t (*) (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 = (status_t (*) (prf_t *,chunk_t))set_key;
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this->public.prf_interface.destroy = (status_t (*) (prf_t *))destroy;
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this->hmac = hmac_create(HASH_SHA1);
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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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