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/*
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/mem_ops.h>
#include <botan/internal/ct_utils.h>
#include <cstdlib>
#include <new>
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
#include <botan/internal/locking_allocator.h>
#endif
namespace Botan {
BOTAN_MALLOC_FN void* allocate_memory(size_t elems, size_t elem_size)
{
if(elems == 0 || elem_size == 0)
return nullptr;
// Some calloc implementations do not check for overflow (?!?)
const size_t total_size = elems * elem_size;
if(total_size < elems || total_size < elem_size)
throw std::bad_alloc();
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
if(void* p = mlock_allocator::instance().allocate(elems, elem_size))
return p;
#endif
#if defined(BOTAN_TARGET_OS_HAS_ALLOC_CONCEAL)
void *ptr = ::calloc_conceal(elems, elem_size);
#else
void* ptr = std::calloc(elems, elem_size);
#endif
if(!ptr)
throw std::bad_alloc();
return ptr;
}
void deallocate_memory(void* p, size_t elems, size_t elem_size)
{
if(p == nullptr)
return;
secure_scrub_memory(p, elems * elem_size);
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
if(mlock_allocator::instance().deallocate(p, elems, elem_size))
return;
#endif
std::free(p);
}
void initialize_allocator()
{
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
mlock_allocator::instance();
#endif
}
uint8_t ct_compare_u8(const uint8_t x[],
const uint8_t y[],
size_t len)
{
volatile uint8_t difference = 0;
for(size_t i = 0; i != len; ++i)
difference = difference | (x[i] ^ y[i]);
return CT::Mask<uint8_t>::is_zero(difference).value();
}
}
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