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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/botan/botan_rng.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:  * Copyright (C) 2018 René Korthaus
                      3:  * Rohde & Schwarz Cybersecurity GmbH
                      4:  *
                      5:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      6:  * of this software and associated documentation files (the "Software"), to deal
                      7:  * in the Software without restriction, including without limitation the rights
                      8:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                      9:  * copies of the Software, and to permit persons to whom the Software is
                     10:  * furnished to do so, subject to the following conditions:
                     11:  *
                     12:  * The above copyright notice and this permission notice shall be included in
                     13:  * all copies or substantial portions of the Software.
                     14:  *
                     15:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     16:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     17:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
                     18:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     19:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     20:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     21:  * THE SOFTWARE.
                     22:  */
                     23: 
                     24: #include "botan_rng.h"
1.1.1.2 ! misho      25: #include "botan_util.h"
1.1       misho      26: 
                     27: #include <botan/build.h>
                     28: 
                     29: #ifdef BOTAN_HAS_HMAC_DRBG
                     30: 
                     31: #include <botan/ffi.h>
                     32: 
                     33: typedef struct private_botan_random_t private_botan_random_t;
                     34: 
                     35: /**
                     36:  * Private data of an botan_rng_t object.
                     37:  */
                     38: struct private_botan_random_t {
                     39: 
                     40:        /**
                     41:         * Public botan_rnd_t interface.
                     42:         */
                     43:        botan_random_t public;
                     44: 
                     45:        /**
                     46:         * RNG quality of this instance
                     47:         */
                     48:        rng_quality_t quality;
                     49: 
                     50:        /**
                     51:         * RNG instance
                     52:         */
                     53:        botan_rng_t rng;
                     54: };
                     55: 
                     56: METHOD(rng_t, get_bytes, bool,
                     57:        private_botan_random_t *this, size_t bytes, uint8_t *buffer)
                     58: {
                     59:        return botan_rng_get(this->rng, buffer, bytes) == 0;
                     60: }
                     61: 
                     62: METHOD(rng_t, allocate_bytes, bool,
                     63:        private_botan_random_t *this, size_t bytes, chunk_t *chunk)
                     64: {
                     65:        *chunk = chunk_alloc(bytes);
                     66:        if (!get_bytes(this, chunk->len, chunk->ptr))
                     67:        {
                     68:                chunk_free(chunk);
                     69:                return FALSE;
                     70:        }
                     71:        return TRUE;
                     72: }
                     73: 
                     74: METHOD(rng_t, destroy, void,
                     75:        private_botan_random_t *this)
                     76: {
                     77:        botan_rng_destroy(this->rng);
                     78:        free(this);
                     79: }
                     80: 
                     81: /*
                     82:  * Described in header
                     83:  */
                     84: botan_random_t *botan_rng_create(rng_quality_t quality)
                     85: {
                     86:        private_botan_random_t *this;
1.1.1.2 ! misho      87:        const char *rng_name;
1.1       misho      88: 
1.1.1.2 ! misho      89:        rng_name = botan_map_rng_quality(quality);
        !            90:        if (!rng_name)
1.1       misho      91:        {
1.1.1.2 ! misho      92:                return NULL;
1.1       misho      93:        }
                     94: 
                     95:        INIT(this,
                     96:                .public = {
                     97:                        .rng = {
                     98:                                .get_bytes = _get_bytes,
                     99:                                .allocate_bytes = _allocate_bytes,
                    100:                                .destroy = _destroy,
                    101:                        },
                    102:                },
                    103:                .quality = quality,
                    104:        );
                    105: 
                    106:        if (botan_rng_init(&this->rng, rng_name))
                    107:        {
                    108:                free(this);
                    109:                return NULL;
                    110:        }
                    111:        return &this->public;
                    112: }
                    113: 
                    114: #endif