src/libstrongswan/plugins/nonce/nonce_nonceg.c

   1 /*
   2  * Copyright (C) 2012 Adrian-Ken Rueegsegger
   3  * HSR Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include "nonce_nonceg.h"
  17
  18 #include <utils/debug.h>
  19
  20 typedef struct private_nonce_nonceg_t private_nonce_nonceg_t;
  21
  22 /**
  23  * Private data of a nonce_nonceg_t object.
  24  */
  25 struct private_nonce_nonceg_t {
  26
  27         /**
  28          * Public nonce_nonceg_t interface.
  29          */
  30         nonce_nonceg_t public;
  31
  32         /**
  33          * Random number generator
  34          */
  35         rng_t* rng;
  36 };
  37
  38 METHOD(nonce_gen_t, get_nonce, bool,
  39         private_nonce_nonceg_t *this, size_t size, uint8_t *buffer)
  40 {
  41         return this->rng->get_bytes(this->rng, size, buffer);
  42 }
  43
  44 METHOD(nonce_gen_t, allocate_nonce, bool,
  45         private_nonce_nonceg_t *this, size_t size, chunk_t *chunk)
  46 {
  47         return this->rng->allocate_bytes(this->rng, size, chunk);
  48 }
  49
  50 METHOD(nonce_gen_t, destroy, void,
  51         private_nonce_nonceg_t *this)
  52 {
  53         DESTROY_IF(this->rng);
  54         free(this);
  55 }
  56
  57 /*
  58  * Described in header.
  59  */
  60 nonce_nonceg_t *nonce_nonceg_create()
  61 {
  62         private_nonce_nonceg_t *this;
  63
  64         INIT(this,
  65                 .public = {
  66                         .nonce_gen = {
  67                                 .get_nonce = _get_nonce,
  68                                 .allocate_nonce = _allocate_nonce,
  69                                 .destroy = _destroy,
  70                         },
  71                 },
  72         );
  73
  74         this->rng = lib->crypto->create_rng(lib->crypto, NONCE_RNG_QUALITY);
  75         if (!this->rng)
  76         {
  77                 DBG1(DBG_LIB, "no RNG found for quality %N", rng_quality_names,
  78                          RNG_WEAK);
  79                 destroy(this);
  80                 return NULL;
  81         }
  82
  83         return &this->public;
  84 }