diff --git a/src/constant_time_algo.cc b/src/constant_time_algo.cc
deleted file mode 100644
index 582cf0e..0000000
--- a/src/constant_time_algo.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-// This file is under GNU General Public License 3.0
-// see LICENSE.txt
-
-#include "constant_time_algo.hh"
-
-namespace pEp {
-    bool constant_time_equal(const std::string &a, const std::string &b)
-    {
-        if (a.size() != b.size())
-            return false;
-
-        unsigned d = 0;
-        for (std::size_t idx = 0; idx < a.size(); ++idx) {
-            d |= (static_cast<unsigned>(a[idx]) ^ static_cast<unsigned>(b[idx]));
-        }
-
-        // if d is still 0, the strings are equal.
-        return d == 0;
-    }
-
-} // end of namespace pEp
diff --git a/src/constant_time_algo.hh b/src/constant_time_algo.hh
deleted file mode 100644
index c9e5733..0000000
--- a/src/constant_time_algo.hh
+++ /dev/null
@@ -1,19 +0,0 @@
-// This file is under GNU General Public License 3.0
-// see LICENSE.txt
-
-#ifndef LIBPEPADAPTER_CONSTANT_TIME_ALGO_HH
-#define LIBPEPADAPTER_CONSTANT_TIME_ALGO_HH
-
-#include <string>
-
-namespace pEp {
-    // Returns false if a.size() != b.size().
-    // Compares always _all_ characters of 'a' and 'b' so runtime does not
-    // depends on the character position where the strings differ.
-    // Use this function instead of operator== if timing sidechannel attack
-    // might be a security problem.
-    bool constant_time_equal(const std::string &a, const std::string &b);
-
-} // end of namespace pEp
-
-#endif // LIBPEPADAPTER_CONSTANT_TIME_ALGO_HH