1 files changed, 68 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/utils/mem_ops.cpp b/comm/third_party/botan/src/lib/utils/mem_ops.cpp
new file mode 100644
index 0000000000..9ef1d6c4e3
--- /dev/null
+++ b/comm/third_party/botan/src/lib/utils/mem_ops.cpp
@@ -0,0 +1,68 @@
+/*
+* (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/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;
+
+#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
+   if(void* p = mlock_allocator::instance().allocate(elems, elem_size))
+      return p;
+#endif
+
+   void* ptr = std::calloc(elems, elem_size);
+   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 |= (x[i] ^ y[i]);
+
+   return CT::Mask<uint8_t>::is_zero(difference).value();
+   }
+
+}