Botan 2.13.0 Crypto and TLS for C++11

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mem_ops.cpp
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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 <cstdlib>
10 #include <new>
11
12 #if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
13 #include <botan/locking_allocator.h>
14 #endif
15
16 namespace Botan {
17
18 BOTAN_MALLOC_FN void* allocate_memory(size_t elems, size_t elem_size)
19 {
20 if(elems == 0 || elem_size == 0)
21 return nullptr;
22
23 #if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
24 if(void* p = mlock_allocator::instance().allocate(elems, elem_size))
25 return p;
26 #endif
27
28 void* ptr = std::calloc(elems, elem_size);
29 if(!ptr)
30 throw std::bad_alloc();
31 return ptr;
32 }
33
34 void deallocate_memory(void* p, size_t elems, size_t elem_size)
35 {
36 if(p == nullptr)
37 return;
38
39 secure_scrub_memory(p, elems * elem_size);
40
41 #if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
42 if(mlock_allocator::instance().deallocate(p, elems, elem_size))
43 return;
44 #endif
45
46 std::free(p);
47 }
48
49 void initialize_allocator()
50 {
51 #if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
52 mlock_allocator::instance();
53 #endif
54 }
55
56 uint8_t ct_compare_u8(const uint8_t x[],
57 const uint8_t y[],
58 size_t len)
59 {
60 volatile uint8_t difference = 0;
61
62 for(size_t i = 0; i != len; ++i)
63 difference |= (x[i] ^ y[i]);
64
65 return CT::Mask<uint8_t>::is_zero(difference).value();
66 }
67
68 }
Botan::mlock_allocator::instance
static mlock_allocator & instance()
Definition: locking_allocator.cpp:69
Botan::allocate_memory
BOTAN_MALLOC_FN void * allocate_memory(size_t elems, size_t elem_size)
Definition: mem_ops.cpp:18
BOTAN_MALLOC_FN
#define BOTAN_MALLOC_FN
Definition: compiler.h:94
Botan::ct_compare_u8
uint8_t ct_compare_u8(const uint8_t x[], const uint8_t y[], size_t len)
Definition: mem_ops.cpp:56
Botan::deallocate_memory
void deallocate_memory(void *p, size_t elems, size_t elem_size)
Definition: mem_ops.cpp:34
Botan
Definition: alg_id.cpp:13
Botan::secure_scrub_memory
void secure_scrub_memory(void *ptr, size_t n)
Definition: os_utils.cpp:66
Botan::CT::Mask::is_zero
static Mask< T > is_zero(T x)
Definition: ct_utils.h:141
Botan::initialize_allocator
void initialize_allocator()
Definition: mem_ops.cpp:49