102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* Copyright (C) 2012-2018 Tobias Brunner
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* HSR Hochschule fuer Technik Rapperswil
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*
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* Copyright (C) 2012 Aleksandr Grinberg
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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 <library.h>
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#include <utils/debug.h>
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#include <openssl/rand.h>
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#include "openssl_rng.h"
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typedef struct private_openssl_rng_t private_openssl_rng_t;
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/**
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* Private data of openssl_rng_t
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*/
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struct private_openssl_rng_t {
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/**
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* Public part of this class.
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*/
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openssl_rng_t public;
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/**
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* Quality of randomness
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*/
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rng_quality_t quality;
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};
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METHOD(rng_t, get_bytes, bool,
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private_openssl_rng_t *this, size_t bytes, uint8_t *buffer)
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{
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#if OPENSSL_VERSION_NUMBER >= 0x1010100fL
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if (this->quality > RNG_WEAK)
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{ /* use a separate DRBG for data we want to keep private, compared
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* to e.g. nonces */
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return RAND_priv_bytes((char*)buffer, bytes) == 1;
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}
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#endif
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return RAND_bytes((char*)buffer, bytes) == 1;
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}
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METHOD(rng_t, allocate_bytes, bool,
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private_openssl_rng_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_openssl_rng_t *this)
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{
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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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openssl_rng_t *openssl_rng_create(rng_quality_t quality)
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{
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private_openssl_rng_t *this;
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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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return &this->public;
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}
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