updated Doxyfile

properly close all doxygen groups
fixed remaining doxygen warnings

src/libstrongswan/plugins/openssl/openssl_hasher.h

@@ -42,9 +42,8 @@ struct openssl_hasher_t {
  * Constructor to create openssl_hasher_t.
  * 
  * @param algo			algorithm
- * @param key_size		key size in bytes
  * @return				openssl_hasher_t, NULL if not supported
  */
 openssl_hasher_t *openssl_hasher_create(hash_algorithm_t algo);
 
-#endif /* OPENSSL_HASHER_H_ @}*/
+#endif /** OPENSSL_HASHER_H_ @}*/