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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/openssl/openssl_rng.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2012-2018 Tobias Brunner
                      3:  * HSR Hochschule fuer Technik Rapperswil
                      4:  *
                      5:  * Copyright (C) 2012 Aleksandr Grinberg
                      6:  *
                      7:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      8:  * of this software and associated documentation files (the "Software"), to deal
                      9:  * in the Software without restriction, including without limitation the rights
                     10:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     11:  * copies of the Software, and to permit persons to whom the Software is
                     12:  * furnished to do so, subject to the following conditions:
                     13:  *
                     14:  * The above copyright notice and this permission notice shall be included in
                     15:  * all copies or substantial portions of the Software.
                     16:  *
                     17:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     18:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     19:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
                     20:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     21:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     22:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     23:  * THE SOFTWARE.
                     24:  */
                     25: 
                     26: #include <library.h>
                     27: #include <utils/debug.h>
                     28: 
                     29: #include <openssl/rand.h>
                     30: 
                     31: #include "openssl_rng.h"
                     32: 
                     33: typedef struct private_openssl_rng_t private_openssl_rng_t;
                     34: 
                     35: /**
                     36:  * Private data of openssl_rng_t
                     37:  */
                     38: struct private_openssl_rng_t {
                     39: 
                     40:        /**
                     41:         * Public part of this class.
                     42:         */
                     43:        openssl_rng_t public;
                     44: 
                     45:        /**
                     46:         * Quality of randomness
                     47:         */
                     48:        rng_quality_t quality;
                     49: };
                     50: 
                     51: METHOD(rng_t, get_bytes, bool,
                     52:        private_openssl_rng_t *this, size_t bytes, uint8_t *buffer)
                     53: {
                     54: #if OPENSSL_VERSION_NUMBER >= 0x1010100fL
                     55:        if (this->quality > RNG_WEAK)
                     56:        {       /* use a separate DRBG for data we want to keep private, compared
                     57:                 * to e.g. nonces */
                     58:                return RAND_priv_bytes((char*)buffer, bytes) == 1;
                     59:        }
                     60: #endif
                     61:        return RAND_bytes((char*)buffer, bytes) == 1;
                     62: }
                     63: 
                     64: METHOD(rng_t, allocate_bytes, bool,
                     65:        private_openssl_rng_t *this, size_t bytes, chunk_t *chunk)
                     66: {
                     67:        *chunk = chunk_alloc(bytes);
                     68:        if (!get_bytes(this, chunk->len, chunk->ptr))
                     69:        {
                     70:                chunk_free(chunk);
                     71:                return FALSE;
                     72:        }
                     73:        return TRUE;
                     74: }
                     75: 
                     76: METHOD(rng_t, destroy, void,
                     77:        private_openssl_rng_t *this)
                     78: {
                     79:        free(this);
                     80: }
                     81: 
                     82: /*
                     83:  * Described in header.
                     84:  */
                     85: openssl_rng_t *openssl_rng_create(rng_quality_t quality)
                     86: {
                     87:        private_openssl_rng_t *this;
                     88: 
                     89:        INIT(this,
                     90:                .public = {
                     91:                        .rng = {
                     92:                                .get_bytes = _get_bytes,
                     93:                                .allocate_bytes = _allocate_bytes,
                     94:                                .destroy = _destroy,
                     95:                        },
                     96:                },
                     97:                .quality = quality,
                     98:        );
                     99: 
                    100:        return &this->public;
                    101: }