tfc_say(" show: do default action, then dump CTR value to stderr,");
tfc_say(" head: when decrypting, read CTR from beginning of stream,");
tfc_say(" rand: generate random CTR and write it to beginning of stream,");
tfc_say(" show: do default action, then dump CTR value to stderr,");
tfc_say(" head: when decrypting, read CTR from beginning of stream,");
tfc_say(" rand: generate random CTR and write it to beginning of stream,");