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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/iv/iv_gen_rand.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2013 Tobias Brunner
                      3:  * HSR Hochschule fuer Technik Rapperswil
                      4:  *
                      5:  * This program is free software; you can redistribute it and/or modify it
                      6:  * under the terms of the GNU General Public License as published by the
                      7:  * Free Software Foundation; either version 2 of the License, or (at your
                      8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                      9:  *
                     10:  * This program is distributed in the hope that it will be useful, but
                     11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     13:  * for more details.
                     14:  */
                     15: 
                     16: #include "iv_gen_rand.h"
                     17: 
                     18: #include <library.h>
                     19: 
                     20: typedef struct private_iv_gen_t private_iv_gen_t;
                     21: 
                     22: /**
                     23:  * Private data of an iv_gen_t object.
                     24:  */
                     25: struct private_iv_gen_t {
                     26: 
                     27:        /**
                     28:         * Public iv_gen_t interface.
                     29:         */
                     30:        iv_gen_t public;
                     31: 
                     32:        /**
                     33:         * rng_t object
                     34:         */
                     35:        rng_t *rng;
                     36: };
                     37: 
                     38: METHOD(iv_gen_t, get_iv, bool,
                     39:        private_iv_gen_t *this, uint64_t seq, size_t size, uint8_t *buffer)
                     40: {
                     41:        if (!this->rng)
                     42:        {
                     43:                return FALSE;
                     44:        }
                     45:        return this->rng->get_bytes(this->rng, size, buffer);
                     46: }
                     47: 
                     48: METHOD(iv_gen_t, allocate_iv, bool,
                     49:        private_iv_gen_t *this, uint64_t seq, size_t size, chunk_t *chunk)
                     50: {
                     51:        if (!this->rng)
                     52:        {
                     53:                return FALSE;
                     54:        }
                     55:        return this->rng->allocate_bytes(this->rng, size, chunk);
                     56: }
                     57: 
                     58: METHOD(iv_gen_t, destroy, void,
                     59:        private_iv_gen_t *this)
                     60: {
                     61:        DESTROY_IF(this->rng);
                     62:        free(this);
                     63: }
                     64: 
                     65: iv_gen_t *iv_gen_rand_create()
                     66: {
                     67:        private_iv_gen_t *this;
                     68: 
                     69:        INIT(this,
                     70:                .public = {
                     71:                        .get_iv = _get_iv,
                     72:                        .allocate_iv = _allocate_iv,
                     73:                        .destroy = _destroy,
                     74:                },
                     75:                .rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK),
                     76:        );
                     77: 
                     78:        return &this->public;
                     79: }