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-rw-r--r--openssl/utility.cxx41
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diff --git a/openssl/utility.cxx b/openssl/utility.cxx
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+// file : openssl/utility.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <openssl/utility.hxx>
+
+#include <strings.h> // explicit_bzero()
+
+#include <cstdlib> // exit()
+#include <cstring> // memset()
+
+namespace openssl
+{
+ using namespace std;
+
+ void
+ mem_clear (void* p, size_t n)
+ {
+ // Note that explicit_bzero() is only available in glibc starting 2.25.
+ //
+#if defined (__GLIBC__) && \
+ defined (__GLIBC_MINOR__) && \
+ (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)
+
+ explicit_bzero (p, n);
+
+#else
+
+ memset (p, 0, n);
+
+ // Make sure the function is not optimized out.
+ //
+ for (char *i (reinterpret_cast<char*> (p)), *e (i + n); i != e; ++i)
+ {
+ if (*i != '\0')
+ exit (*i);
+ }
+
+#endif
+ }
+}