115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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* Copyright (C) 2018 René Korthaus
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* Rohde & Schwarz Cybersecurity GmbH
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "botan_rng.h"
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#include "botan_util.h"
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#include <botan/build.h>
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#ifdef BOTAN_HAS_HMAC_DRBG
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#include <botan/ffi.h>
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typedef struct private_botan_random_t private_botan_random_t;
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/**
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* Private data of an botan_rng_t object.
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*/
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struct private_botan_random_t {
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/**
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* Public botan_rnd_t interface.
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*/
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botan_random_t public;
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/**
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* RNG quality of this instance
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*/
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rng_quality_t quality;
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/**
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* RNG instance
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*/
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botan_rng_t rng;
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};
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METHOD(rng_t, get_bytes, bool,
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private_botan_random_t *this, size_t bytes, uint8_t *buffer)
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{
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return botan_rng_get(this->rng, buffer, bytes) == 0;
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}
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METHOD(rng_t, allocate_bytes, bool,
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private_botan_random_t *this, size_t bytes, chunk_t *chunk)
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{
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*chunk = chunk_alloc(bytes);
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if (!get_bytes(this, chunk->len, chunk->ptr))
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{
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chunk_free(chunk);
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return FALSE;
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}
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return TRUE;
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}
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METHOD(rng_t, destroy, void,
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private_botan_random_t *this)
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{
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botan_rng_destroy(this->rng);
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free(this);
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}
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/*
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* Described in header
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*/
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botan_random_t *botan_rng_create(rng_quality_t quality)
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{
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private_botan_random_t *this;
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const char *rng_name;
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rng_name = botan_map_rng_quality(quality);
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if (!rng_name)
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{
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return NULL;
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}
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INIT(this,
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.public = {
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.rng = {
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.get_bytes = _get_bytes,
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.allocate_bytes = _allocate_bytes,
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.destroy = _destroy,
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},
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},
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.quality = quality,
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);
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if (botan_rng_init(&this->rng, rng_name))
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{
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free(this);
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return NULL;
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}
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return &this->public;
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}
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#endif
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