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diff --git a/comm/third_party/botan/src/lib/utils/rounding.h b/comm/third_party/botan/src/lib/utils/rounding.h
new file mode 100644
index 0000000000..ae0aedf07c
--- /dev/null
+++ b/comm/third_party/botan/src/lib/utils/rounding.h
@@ -0,0 +1,56 @@
+/*
+* Integer Rounding Functions
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_ROUNDING_H_
+#define BOTAN_ROUNDING_H_
+
+#include <botan/types.h>
+
+namespace Botan {
+
+/**
+* Round up
+* @param n a non-negative integer
+* @param align_to the alignment boundary
+* @return n rounded up to a multiple of align_to
+*/
+inline size_t round_up(size_t n, size_t align_to)
+   {
+   BOTAN_ARG_CHECK(align_to != 0, "align_to must not be 0");
+
+   if(n % align_to)
+      n += align_to - (n % align_to);
+   return n;
+   }
+
+/**
+* Round down
+* @param n an integer
+* @param align_to the alignment boundary
+* @return n rounded down to a multiple of align_to
+*/
+template<typename T>
+inline constexpr T round_down(T n, T align_to)
+   {
+   return (align_to == 0) ? n : (n - (n % align_to));
+   }
+
+/**
+* Clamp
+*/
+inline size_t clamp(size_t n, size_t lower_bound, size_t upper_bound)
+   {
+   if(n < lower_bound)
+      return lower_bound;
+   if(n > upper_bound)
+      return upper_bound;
+   return n;
+   }
+
+}
+
+#endif