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Strongswan

    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: }