Fixing test vectors and use of SHA512 (#120)

src/tests/mod.rs

@@ -3,6 +3,7 @@
 // This source code is licensed under the MIT license found in the
 // LICENSE file in the root directory of this source tree.
 
+mod full_test;
 pub mod mock_rng;
-mod opaque_ke_test;
+mod opaque_test_vectors;
 mod voprf_test_vectors;