V1_CONFOUNDER_LEN
if (in->status || in->len < V1_CONFOUNDER_LEN + 1 ||
if (plainlen - V1_CONFOUNDER_LEN < padlen) {
output_message->length = plainlen - V1_CONFOUNDER_LEN - padlen;
memcpy(output_message->value, plain + V1_CONFOUNDER_LEN,