Test SHAKE128 variable length output

test/Jamfile

@@ -99,3 +99,4 @@ run test_nist_cavs_sha3_224_short_long.cpp ;
 
 run test_nist_cavs_shake128_short_long.cpp ;
 run test_nist_cavs_shake128_monte.cpp ;
+run test_nist_cavs_shake128_variable_output.cpp ;

test/test_nist_cavs_shake128_variable_output.cpp

@@ -0,0 +1,26 @@
+// Copyright 2024 Matt Borland
+// Copyright 2024 Christopher Kormanyos
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/crypt/hash/shake128.hpp>
+
+#include "test_nist_cavs_detail.hpp"
+
+auto main() -> int
+{
+  bool result_is_ok { true };
+
+    {
+        nist::cavs::test_vector_container_type my_test_vectors_variable { };
+
+        std::vector<std::size_t> lengths {};
+        static_cast<void>(nist::cavs::detail::parse_file_vectors_variable_xof("SHAKE128VariableOut.rsp", my_test_vectors_variable, lengths));
+
+        result_is_ok = (nist::cavs::test_vectors_variable<boost::crypt::shake128_hasher>(my_test_vectors_variable, lengths) && result_is_ok);
+
+        BOOST_TEST(result_is_ok);
+    }
+
+  return boost::report_errors();
+}