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