/src/botan/src/lib/utils/mem_ops.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * (C) 2017 Jack Lloyd |
3 | | * |
4 | | * Botan is released under the Simplified BSD License (see license.txt) |
5 | | */ |
6 | | |
7 | | #include <botan/mem_ops.h> |
8 | | |
9 | | #include <botan/internal/ct_utils.h> |
10 | | #include <botan/internal/safeint.h> |
11 | | #include <cstdlib> |
12 | | #include <new> |
13 | | |
14 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
15 | | #include <botan/internal/locking_allocator.h> |
16 | | #endif |
17 | | |
18 | | namespace Botan { |
19 | | |
20 | 2.94M | BOTAN_MALLOC_FN void* allocate_memory(size_t elems, size_t elem_size) { |
21 | 2.94M | if(elems == 0 || elem_size == 0) { |
22 | 0 | return nullptr; |
23 | 0 | } |
24 | | |
25 | | // Some calloc implementations do not check for overflow (?!?) |
26 | | |
27 | 2.94M | if(!BOTAN_CHECKED_MUL(elems, elem_size).has_value()) { |
28 | 0 | throw std::bad_alloc(); |
29 | 0 | } |
30 | | |
31 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
32 | | if(void* p = mlock_allocator::instance().allocate(elems, elem_size)) { |
33 | | return p; |
34 | | } |
35 | | #endif |
36 | | |
37 | | #if defined(BOTAN_TARGET_OS_HAS_ALLOC_CONCEAL) |
38 | | void* ptr = ::calloc_conceal(elems, elem_size); |
39 | | #else |
40 | 2.94M | void* ptr = std::calloc(elems, elem_size); // NOLINT(*-no-malloc) |
41 | 2.94M | #endif |
42 | 2.94M | if(!ptr) { |
43 | 0 | [[unlikely]] throw std::bad_alloc(); |
44 | 0 | } |
45 | 2.94M | return ptr; |
46 | 2.94M | } |
47 | | |
48 | 2.94M | void deallocate_memory(void* p, size_t elems, size_t elem_size) { |
49 | 2.94M | if(p == nullptr) { |
50 | 0 | [[unlikely]] return; |
51 | 0 | } |
52 | | |
53 | 2.94M | secure_scrub_memory(p, elems * elem_size); |
54 | | |
55 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
56 | | if(mlock_allocator::instance().deallocate(p, elems, elem_size)) { |
57 | | return; |
58 | | } |
59 | | #endif |
60 | | |
61 | 2.94M | std::free(p); // NOLINT(*-no-malloc) |
62 | 2.94M | } |
63 | | |
64 | 1 | void initialize_allocator() { |
65 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
66 | | mlock_allocator::instance(); |
67 | | #endif |
68 | 1 | } |
69 | | |
70 | 0 | uint8_t ct_compare_u8(const uint8_t x[], const uint8_t y[], size_t len) { |
71 | 0 | volatile uint8_t difference = 0; |
72 | |
|
73 | 0 | for(size_t i = 0; i != len; ++i) { |
74 | 0 | difference = difference | (x[i] ^ y[i]); |
75 | 0 | } |
76 | |
|
77 | 0 | return CT::Mask<uint8_t>::is_zero(difference).value(); |
78 | 0 | } |
79 | | |
80 | | } // namespace Botan |