krb5_spake_response
krb5_spake_response response;
DEFFIELD(spake_response_0, krb5_spake_response, pubkey, 0, ostring_data);
DEFFIELD(spake_response_1, krb5_spake_response, factor, 1, encrypted_data);
DEFSEQTYPE(spake_response, krb5_spake_response, spake_response_fields);
krb5_spake_response *resp, const krb5_data *realm,