1 files changed, 75 insertions, 0 deletions
diff --git a/src/lib/utils/mem_ops.h b/src/lib/utils/mem_ops.h
new file mode 100644
index 000000000..be617ff19
--- /dev/null
+++ b/src/lib/utils/mem_ops.h
@@ -0,0 +1,75 @@
+/*
+* Memory Operations
+* (C) 1999-2009,2012 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_MEMORY_OPS_H__
+#define BOTAN_MEMORY_OPS_H__
+
+#include <botan/types.h>
+#include <cstring>
+
+namespace Botan {
+
+/**
+* Zeroize memory
+* @param ptr a pointer to memory to zero out
+* @param n the number of bytes pointed to by ptr
+*/
+BOTAN_DLL void zero_mem(void* ptr, size_t n);
+
+/**
+* Zeroize memory
+* @param ptr a pointer to an array
+* @param n the number of Ts pointed to by ptr
+*/
+template<typename T> inline void clear_mem(T* ptr, size_t n)
+   {
+   zero_mem(ptr, sizeof(T)*n);
+   }
+
+/**
+* Copy memory
+* @param out the destination array
+* @param in the source array
+* @param n the number of elements of in/out
+*/
+template<typename T> inline void copy_mem(T* out, const T* in, size_t n)
+   {
+   std::memmove(out, in, sizeof(T)*n);
+   }
+
+/**
+* Set memory to a fixed value
+* @param ptr a pointer to an array
+* @param n the number of Ts pointed to by ptr
+* @param val the value to set each byte to
+*/
+template<typename T>
+inline void set_mem(T* ptr, size_t n, byte val)
+   {
+   std::memset(ptr, val, sizeof(T)*n);
+   }
+
+/**
+* Memory comparison, input insensitive
+* @param p1 a pointer to an array
+* @param p2 a pointer to another array
+* @param n the number of Ts in p1 and p2
+* @return true iff p1[i] == p2[i] forall i in [0...n)
+*/
+template<typename T> inline bool same_mem(const T* p1, const T* p2, size_t n)
+   {
+   volatile T difference = 0;
+
+   for(size_t i = 0; i != n; ++i)
+      difference |= (p1[i] ^ p2[i]);
+
+   return difference == 0;
+   }
+
+}
+
+#endif