src/libstrongswan/crypto/iv/iv_gen_null.c

   1 /*
   2  * Copyright (C) 2015 Tobias Brunner
   3  *
   4  * Copyright (C) secunet Security Networks AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  */
  16
  17 #include "iv_gen_null.h"
  18
  19 typedef struct private_iv_gen_t private_iv_gen_t;
  20
  21 /**
  22  * Private data of an iv_gen_t object.
  23  */
  24 struct private_iv_gen_t {
  25
  26         /**
  27          * Public iv_gen_t interface.
  28          */
  29         iv_gen_t public;
  30 };
  31
  32 METHOD(iv_gen_t, get_iv, bool,
  33         private_iv_gen_t *this, uint64_t seq, size_t size, uint8_t *buffer)
  34 {
  35         return size == 0;
  36 }
  37
  38 METHOD(iv_gen_t, allocate_iv, bool,
  39         private_iv_gen_t *this, uint64_t seq, size_t size, chunk_t *chunk)
  40 {
  41         *chunk = chunk_empty;
  42         return size == 0;
  43 }
  44
  45 METHOD(iv_gen_t, destroy, void,
  46         private_iv_gen_t *this)
  47 {
  48         free(this);
  49 }
  50
  51 iv_gen_t *iv_gen_null_create()
  52 {
  53         private_iv_gen_t *this;
  54
  55         INIT(this,
  56                 .public = {
  57                         .get_iv = _get_iv,
  58                         .allocate_iv = _allocate_iv,
  59                         .destroy = _destroy,
  60                 },
  61         );
  62
  63         return &this->public;
  64 }