/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 | | #include <botan/internal/ct_utils.h> |
9 | | #include <botan/internal/safeint.h> |
10 | | #include <cstdlib> |
11 | | #include <new> |
12 | | |
13 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
14 | | #include <botan/internal/locking_allocator.h> |
15 | | #endif |
16 | | |
17 | | namespace Botan { |
18 | | |
19 | | BOTAN_MALLOC_FN void* allocate_memory(size_t elems, size_t elem_size) |
20 | 146M | { |
21 | 146M | if(elems == 0 || elem_size == 0) |
22 | 0 | return nullptr; |
23 | | |
24 | | // Some calloc implementations do not check for overflow (?!?) |
25 | | |
26 | 146M | if(!BOTAN_CHECKED_MUL(elems, elem_size).has_value()) |
27 | 0 | throw std::bad_alloc(); |
28 | | |
29 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
30 | | if(void* p = mlock_allocator::instance().allocate(elems, elem_size)) |
31 | | return p; |
32 | | #endif |
33 | | |
34 | | #if defined(BOTAN_TARGET_OS_HAS_ALLOC_CONCEAL) |
35 | | void *ptr = ::calloc_conceal(elems, elem_size); |
36 | | #else |
37 | 146M | void* ptr = std::calloc(elems, elem_size); |
38 | 146M | #endif |
39 | 146M | if(!ptr) [[unlikely]] |
40 | 0 | throw std::bad_alloc(); |
41 | 146M | return ptr; |
42 | 146M | } |
43 | | |
44 | | void deallocate_memory(void* p, size_t elems, size_t elem_size) |
45 | 146M | { |
46 | 146M | if(p == nullptr) [[unlikely]] |
47 | 0 | return; |
48 | | |
49 | 146M | secure_scrub_memory(p, elems * elem_size); |
50 | | |
51 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
52 | | if(mlock_allocator::instance().deallocate(p, elems, elem_size)) |
53 | | return; |
54 | | #endif |
55 | 146M | std::free(p); |
56 | 146M | } |
57 | | |
58 | | void initialize_allocator() |
59 | 8 | { |
60 | | #if defined(BOTAN_HAS_LOCKING_ALLOCATOR) |
61 | | mlock_allocator::instance(); |
62 | | #endif |
63 | 8 | } |
64 | | |
65 | | uint8_t ct_compare_u8(const uint8_t x[], |
66 | | const uint8_t y[], |
67 | | size_t len) |
68 | 7.63k | { |
69 | 7.63k | volatile uint8_t difference = 0; |
70 | | |
71 | 242k | for(size_t i = 0; i != len; ++i) |
72 | 234k | difference = difference | (x[i] ^ y[i]); |
73 | | |
74 | 7.63k | return CT::Mask<uint8_t>::is_zero(difference).value(); |
75 | 7.63k | } |
76 | | |
77 | | } |