bother sending the IV - it's the same each time. (If we wanted to send
it we've have to add 16 bytes to each message, not 4, so that the
message stays a multiple of 16 bytes long.) */
bother sending the IV - it's the same each time. (If we wanted to send
it we've have to add 16 bytes to each message, not 4, so that the
message stays a multiple of 16 bytes long.) */