arc4_init
arc4_init(&rs);
boolean_t arc4_init; /* Initialized? */
arc4_init(arc4->arc4_buf, ARC4_KEYSZ + ARC4_IVSZ);
if (arc4->arc4_init == B_FALSE) {
arc4_init(rnd, sizeof (rnd));
arc4->arc4_init = B_TRUE;