Function ng_mppc_updatekey

freebsd/netgraph/ng_mppc.c:890–904

* Update the encryption key */

 * Update the encryption key
 */
static void
ng_mppc_updatekey(u_int32_t bits,
	u_char *key0, u_char *key, struct rc4_state *rc4)
{ 
	const int keylen = KEYLEN(bits);

	ng_mppc_getkey(key0, key, keylen);
	rc4_init(rc4, key, keylen);
	rc4_crypt(rc4, key, key, keylen);
	if ((bits & MPPE_40) != 0)
		bcopy(&ng_mppe_weakenkey, key, 3);
	else if ((bits & MPPE_56) != 0)
		bcopy(&ng_mppe_weakenkey, key, 1);
	rc4_init(rc4, key, keylen);
}
#endif