All these parameters can be set with EVP_MAC_CTX_set_params().
Furthermore, the "size" parameter can be retrieved with
EVP_MAC_CTX_get_params(), or with EVP_MAC_size().
+The length of the "size" parameter should not exceed that of a B<size_t>.
=over 4
-=item B<OSSL_MAC_PARAM_KEY> ("key") <octet string>
+=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
-=item B<OSSL_MAC_PARAM_SIZE> ("size") <size_t>
+=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
=back