1/*
2 Copyright (c) 2007-2019 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#ifndef __ZMQ_SECURE_ALLOCATOR_HPP_INCLUDED__
31#define __ZMQ_SECURE_ALLOCATOR_HPP_INCLUDED__
32
33#include "platform.hpp"
34#include "macros.hpp"
35
36#ifdef ZMQ_HAVE_CURVE
37
38#if defined(ZMQ_USE_LIBSODIUM)
39#include "sodium.h"
40#endif
41
42#include <memory>
43
44namespace zmq
45{
46#if defined(ZMQ_USE_LIBSODIUM)
47template <class T> struct secure_allocator_t
48{
49 typedef T value_type;
50
51 secure_allocator_t () ZMQ_DEFAULT;
52
53 template <class U>
54 secure_allocator_t (const secure_allocator_t<U> &) ZMQ_NOEXCEPT
55 {
56 }
57 T *allocate (std::size_t n) ZMQ_NOEXCEPT
58 {
59 T *res = static_cast<T *> (sodium_allocarray (sizeof (T), n));
60 alloc_assert (res);
61 return res;
62 }
63 void deallocate (T *p, std::size_t) ZMQ_NOEXCEPT { sodium_free (p); }
64
65 // the following is only required with C++98
66 // TODO maybe make this conditionally compiled
67 typedef T *pointer;
68 typedef const T *const_pointer;
69 typedef T &reference;
70 typedef const T &const_reference;
71 typedef std::size_t size_type;
72 typedef std::ptrdiff_t difference_type;
73 template <class U> struct rebind
74 {
75 typedef secure_allocator_t<U> other;
76 };
77
78 void construct (pointer p, const_reference val)
79 {
80 new ((void *) p) value_type (val);
81 }
82 void destroy (pointer p) { p->~value_type (); }
83 size_type max_size () const { return SIZE_MAX; }
84};
85template <class T, class U>
86bool operator== (const secure_allocator_t<T> &, const secure_allocator_t<U> &)
87{
88 return true;
89}
90template <class T, class U>
91bool operator!= (const secure_allocator_t<T> &, const secure_allocator_t<U> &)
92{
93 return false;
94}
95#else
96template <typename T> struct secure_allocator_t : std::allocator<T>
97{
98};
99#endif
100}
101
102#endif
103
104#endif
105