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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/prfs/mac_prf.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2012 Tobias Brunner
                      3:  * Copyright (C) 2005-2006 Martin Willi
                      4:  * Copyright (C) 2005 Jan Hutter
                      5:  * HSR Hochschule fuer Technik Rapperswil
                      6:  *
                      7:  * This program is free software; you can redistribute it and/or modify it
                      8:  * under the terms of the GNU General Public License as published by the
                      9:  * Free Software Foundation; either version 2 of the License, or (at your
                     10:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                     11:  *
                     12:  * This program is distributed in the hope that it will be useful, but
                     13:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     15:  * for more details.
                     16:  */
                     17: 
                     18: #include "mac_prf.h"
                     19: 
                     20: typedef struct private_prf_t private_prf_t;
                     21: 
                     22: /**
                     23:  * Private data of a mac_prf_t object.
                     24:  */
                     25: struct private_prf_t {
                     26: 
                     27:        /**
                     28:         * Public interface
                     29:         */
                     30:        prf_t public;
                     31: 
                     32:        /**
                     33:         * MAC to use
                     34:         */
                     35:        mac_t *mac;
                     36: };
                     37: 
                     38: METHOD(prf_t, get_bytes, bool,
                     39:        private_prf_t *this, chunk_t seed, uint8_t *buffer)
                     40: {
                     41:        return this->mac->get_mac(this->mac, seed, buffer);
                     42: }
                     43: 
                     44: METHOD(prf_t, allocate_bytes, bool,
                     45:        private_prf_t *this, chunk_t seed, chunk_t *chunk)
                     46: {
                     47:        if (chunk)
                     48:        {
                     49:                *chunk = chunk_alloc(this->mac->get_mac_size(this->mac));
                     50:                return this->mac->get_mac(this->mac, seed, chunk->ptr);
                     51:        }
                     52:        return this->mac->get_mac(this->mac, seed, NULL);
                     53: }
                     54: 
                     55: METHOD(prf_t, get_block_size, size_t,
                     56:        private_prf_t *this)
                     57: {
                     58:        return this->mac->get_mac_size(this->mac);
                     59: }
                     60: 
                     61: METHOD(prf_t, get_key_size, size_t,
                     62:        private_prf_t *this)
                     63: {
                     64:        /* IKEv2 uses MAC size as key size */
                     65:        return this->mac->get_mac_size(this->mac);
                     66: }
                     67: 
                     68: METHOD(prf_t, set_key, bool,
                     69:        private_prf_t *this, chunk_t key)
                     70: {
                     71:        return this->mac->set_key(this->mac, key);
                     72: }
                     73: 
                     74: METHOD(prf_t, destroy, void,
                     75:        private_prf_t *this)
                     76: {
                     77:        this->mac->destroy(this->mac);
                     78:        free(this);
                     79: }
                     80: 
                     81: /*
                     82:  * Described in header.
                     83:  */
                     84: prf_t *mac_prf_create(mac_t *mac)
                     85: {
                     86:        private_prf_t *this;
                     87: 
                     88:        INIT(this,
                     89:                .public = {
                     90:                        .get_bytes = _get_bytes,
                     91:                        .allocate_bytes = _allocate_bytes,
                     92:                        .get_block_size = _get_block_size,
                     93:                        .get_key_size = _get_key_size,
                     94:                        .set_key = _set_key,
                     95:                        .destroy = _destroy,
                     96:                },
                     97:                .mac = mac,
                     98:        );
                     99: 
                    100:        return &this->public;
                    101: }