give better exception; refs #30

src/cryptoki.hxx

@@ -1867,11 +1867,15 @@ namespace cryptoki {
                 CK_USER_TYPE userType=CKU_USER): _session(session) {
             CRYPTOLOG("log");
             //! calls @c C_Login
+            try {
               _session.check(_session._slot.library()->C_Login
                              (_session._session, userType,
                               const_cast<CK_CHAR*>((const CK_CHAR*)pin.c_str()),
                               (int)pin.size()),
                              CRYPTOKI_FN_LOG("C_Login"));
+            } catch (std::exception& x) {
+              throw wrong_pin(x.what());
+            }
           }
 
           ~Login() {