diff --git a/util/fipsas.pl b/util/fipsas.pl
new file mode 100644
index 0000000000000000000000000000000000000000..cd8b8c02f4f4dd4624383d4d97cc8113f53e1824
--- /dev/null
+++ b/util/fipsas.pl
@@ -0,0 +1,57 @@
+
+# FIPS assembly language preprocessor
+# Renames all symbols in the file to
+# their modified fips versions.
+
+
+my @ARGS = @ARGV;
+
+my $top = shift @ARGS;
+my $target = shift @ARGS;
+
+# Open symbol rename file.
+open(IN, "$top/fips/fipssyms.h") || die "Can't open fipssyms.h";
+
+# Skip to assembler symbols
+while (<IN>)
+	{
+	last if (/assembler/)
+	}
+
+# Store all renames.
+while (<IN>)
+	{
+	if (/^#define\s+(\w+)\s+(\w+)\b/)
+		{
+		$edits{$1} = $2;
+		}
+	}
+
+my ($from, $to);
+
+#rename target temporarily
+rename($target, "tmptarg.s") || die "Can't rename $target\n";
+
+#edit target
+open IN,"tmptarg.s";
+open OUT, ">$target";
+
+while (<IN>)
+{
+	while (($from, $to) = each %edits)
+		{
+		s/(\b)$from(\b)/$1$to$2/g;
+		}
+	print OUT $_;
+}
+# run assembler
+system @ARGS;
+
+my $rv = $?;
+
+# restore target
+unlink $target;
+rename "tmptarg.s", $target;
+
+die "Error executing assembler!" if $rv != 0;
+