src/libstrongswan/plugins/openssl/openssl_rng.c

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