net/ppp/ppp_mppe.c

337 mppe_compress(void *arg, unsigned char *ibuf, unsigned char *obuf,
364 	obuf[0] = PPP_ADDRESS(ibuf);
365 	obuf[1] = PPP_CONTROL(ibuf);
366 	put_unaligned_be16(PPP_COMP, obuf + 2);
367 	obuf += PPP_HDRLEN;
373 	put_unaligned_be16(state->ccount, obuf);
385 	obuf[0] |= state->bits;
388 	obuf += MPPE_OVHD;
392 	arc4_crypt(&state->arc4, obuf, ibuf, isize);
434 mppe_decompress(void *arg, unsigned char *ibuf, int isize, unsigned char *obuf,
555 	obuf[0] = PPP_ADDRESS(ibuf);	/* +1 */
556 	obuf[1] = PPP_CONTROL(ibuf);	/* +1 */
557 	obuf += 2;
566 	arc4_crypt(&state->arc4, obuf, ibuf, 1);
573 	if ((obuf[0] & 0x01) != 0) {
574 		obuf[1] = obuf[0];
575 		obuf[0] = 0;
576 		obuf++;
581 	arc4_crypt(&state->arc4, obuf + 1, ibuf + 1, isize - 1);