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38 * Author: Archie Cobbs <archie@freebsd.org>
40 * $Whistle: ng_mppc.c,v 1.4 1999/11/25 00:10:12 archie Exp $
41 * $FreeBSD: src/sys/netgraph/ng_mppc.c,v 1.31 2007/05/18 15:28:01 mav Exp $
45 * Microsoft PPP compression (MPPC) and encryption (MPPE) netgraph node type.
47 * You must define one or both of the NETGRAPH_MPPC_COMPRESSION and/or
48 * NETGRAPH_MPPC_ENCRYPTION options for this node type to be useful.
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/kernel.h>
55 #include <sys/malloc.h>
56 #include <sys/errno.h>
57 #include <sys/syslog.h>
59 #include <netgraph7/ng_message.h>
60 #include <netgraph7/netgraph.h>
63 #include "opt_netgraph.h"
65 #if !defined(NETGRAPH7_MPPC_COMPRESSION) && !defined(NETGRAPH7_MPPC_ENCRYPTION)
67 /* XXX NETGRAPH7_MPPC_COMPRESSION isn't functional yet */
68 #define NETGRAPH7_MPPC_ENCRYPTION
70 /* This case is indicative of an error in sys/conf files */
71 #error Need either NETGRAPH7_MPPC_COMPRESSION or NETGRAPH7_MPPC_ENCRYPTION
75 #ifdef NG_SEPARATE_MALLOC
76 MALLOC_DEFINE(M_NETGRAPH_MPPC, "netgraph_mppc", "netgraph mppc node ");
78 #define M_NETGRAPH_MPPC M_NETGRAPH
81 #ifdef NETGRAPH7_MPPC_COMPRESSION
82 /* XXX this file doesn't exist yet, but hopefully someday it will... */
85 #ifdef NETGRAPH7_MPPC_ENCRYPTION
86 #include <crypto/rc4/rc4.h>
88 #include <crypto/sha1.h>
90 /* Decompression blowup */
91 #define MPPC_DECOMP_BUFSIZE 8092 /* allocate buffer this big */
92 #define MPPC_DECOMP_SAFETY 100 /* plus this much margin */
94 /* MPPC/MPPE header length */
98 #define KEYLEN(b) (((b) & MPPE_128) ? 16 : 8)
101 * When packets are lost with MPPE, we may have to re-key arbitrarily
102 * many times to 'catch up' to the new jumped-ahead sequence number.
103 * Since this can be expensive, we pose a limit on how many re-keyings
104 * we will do at one time to avoid a possible D.O.S. vulnerability.
105 * This should instead be a configurable parameter.
107 #define MPPE_MAX_REKEY 1000
109 /* MPPC packet header bits */
110 #define MPPC_FLAG_FLUSHED 0x8000 /* xmitter reset state */
111 #define MPPC_FLAG_RESTART 0x4000 /* compress history restart */
112 #define MPPC_FLAG_COMPRESSED 0x2000 /* packet is compresed */
113 #define MPPC_FLAG_ENCRYPTED 0x1000 /* packet is encrypted */
114 #define MPPC_CCOUNT_MASK 0x0fff /* sequence number mask */
116 #define MPPC_CCOUNT_INC(d) ((d) = (((d) + 1) & MPPC_CCOUNT_MASK))
118 #define MPPE_UPDATE_MASK 0xff /* coherency count when we're */
119 #define MPPE_UPDATE_FLAG 0xff /* supposed to update key */
121 #define MPPC_COMP_OK 0x05
122 #define MPPC_DECOMP_OK 0x05
124 /* Per direction info */
126 struct ng_mppc_config cfg; /* configuration */
127 hook_p hook; /* netgraph hook */
128 u_int16_t cc:12; /* coherency count */
129 u_char flushed; /* clean history (xmit only) */
130 #ifdef NETGRAPH7_MPPC_COMPRESSION
131 u_char *history; /* compression history */
133 #ifdef NETGRAPH7_MPPC_ENCRYPTION
134 u_char key[MPPE_KEY_LEN]; /* session key */
135 struct rc4_state rc4; /* rc4 state */
139 /* Node private data */
140 struct ng_mppc_private {
141 struct ng_mppc_dir xmit; /* compress/encrypt config */
142 struct ng_mppc_dir recv; /* decompress/decrypt config */
143 ng_ID_t ctrlnode; /* path to controlling node */
145 typedef struct ng_mppc_private *priv_p;
147 /* Netgraph node methods */
148 static ng_constructor_t ng_mppc_constructor;
149 static ng_rcvmsg_t ng_mppc_rcvmsg;
150 static ng_shutdown_t ng_mppc_shutdown;
151 static ng_newhook_t ng_mppc_newhook;
152 static ng_rcvdata_t ng_mppc_rcvdata;
153 static ng_disconnect_t ng_mppc_disconnect;
155 /* Helper functions */
156 static int ng_mppc_compress(node_p node,
157 struct mbuf **datap);
158 static int ng_mppc_decompress(node_p node,
159 struct mbuf **datap);
160 #ifdef NETGRAPH7_MPPC_ENCRYPTION
161 static void ng_mppc_getkey(const u_char *h, u_char *h2, int len);
162 static void ng_mppc_updatekey(u_int32_t bits,
163 u_char *key0, u_char *key, struct rc4_state *rc4);
165 static void ng_mppc_reset_req(node_p node);
167 /* Node type descriptor */
168 static struct ng_type ng_mppc_typestruct = {
169 .version = NG_ABI_VERSION,
170 .name = NG_MPPC_NODE_TYPE,
171 .constructor = ng_mppc_constructor,
172 .rcvmsg = ng_mppc_rcvmsg,
173 .shutdown = ng_mppc_shutdown,
174 .newhook = ng_mppc_newhook,
175 .rcvdata = ng_mppc_rcvdata,
176 .disconnect = ng_mppc_disconnect,
178 NETGRAPH_INIT(mppc, &ng_mppc_typestruct);
180 #ifdef NETGRAPH7_MPPC_ENCRYPTION
181 /* Depend on separate rc4 module */
182 MODULE_DEPEND(ng_mppc, rc4, 1, 1, 1);
185 /* Fixed bit pattern to weaken keysize down to 40 or 56 bits */
186 static const u_char ng_mppe_weakenkey[3] = { 0xd1, 0x26, 0x9e };
188 #define ERROUT(x) do { error = (x); goto done; } while (0)
190 /************************************************************************
192 ************************************************************************/
195 * Node type constructor
198 ng_mppc_constructor(node_p node)
202 /* Allocate private structure */
203 priv = kmalloc(sizeof(*priv), M_NETGRAPH_MPPC,
204 M_WAITOK | M_NULLOK | M_ZERO);
208 NG_NODE_SET_PRIVATE(node, priv);
210 /* This node is not thread safe. */
211 NG_NODE_FORCE_WRITER(node);
218 * Give our OK for a hook to be added
221 ng_mppc_newhook(node_p node, hook_p hook, const char *name)
223 const priv_p priv = NG_NODE_PRIVATE(node);
226 /* Check hook name */
227 if (strcmp(name, NG_MPPC_HOOK_COMP) == 0)
228 hookPtr = &priv->xmit.hook;
229 else if (strcmp(name, NG_MPPC_HOOK_DECOMP) == 0)
230 hookPtr = &priv->recv.hook;
234 /* See if already connected */
235 if (*hookPtr != NULL)
244 * Receive a control message
247 ng_mppc_rcvmsg(node_p node, item_p item, hook_p lasthook)
249 const priv_p priv = NG_NODE_PRIVATE(node);
250 struct ng_mesg *resp = NULL;
254 NGI_GET_MSG(item, msg);
255 switch (msg->header.typecookie) {
256 case NGM_MPPC_COOKIE:
257 switch (msg->header.cmd) {
258 case NGM_MPPC_CONFIG_COMP:
259 case NGM_MPPC_CONFIG_DECOMP:
261 struct ng_mppc_config *const cfg
262 = (struct ng_mppc_config *)msg->data;
264 msg->header.cmd == NGM_MPPC_CONFIG_COMP;
265 struct ng_mppc_dir *const d = isComp ?
266 &priv->xmit : &priv->recv;
268 /* Check configuration */
269 if (msg->header.arglen != sizeof(*cfg))
272 if ((cfg->bits & ~MPPC_VALID_BITS) != 0)
274 #ifndef NETGRAPH7_MPPC_COMPRESSION
275 if ((cfg->bits & MPPC_BIT) != 0)
276 ERROUT(EPROTONOSUPPORT);
278 #ifndef NETGRAPH7_MPPC_ENCRYPTION
279 if ((cfg->bits & MPPE_BITS) != 0)
280 ERROUT(EPROTONOSUPPORT);
285 /* Save return address so we can send reset-req's */
287 priv->ctrlnode = NGI_RETADDR(item);
289 /* Configuration is OK, reset to it */
292 #ifdef NETGRAPH7_MPPC_COMPRESSION
293 /* Initialize state buffers for compression */
294 if (d->history != NULL) {
295 kfree(d->history, M_NETGRAPH_MPPC);
298 if ((cfg->bits & MPPC_BIT) != 0) {
299 d->history = kmalloc(isComp ? MPPC_SizeOfCompressionHistory() : MPPC_SizeOfDecompressionHistory(),
301 M_WAITOK | M_NULLOK);
302 if (d->history == NULL)
305 MPPC_InitCompressionHistory(d->history);
307 MPPC_InitDecompressionHistory(
313 #ifdef NETGRAPH7_MPPC_ENCRYPTION
314 /* Generate initial session keys for encryption */
315 if ((cfg->bits & MPPE_BITS) != 0) {
316 const int keylen = KEYLEN(cfg->bits);
318 bcopy(cfg->startkey, d->key, keylen);
319 ng_mppc_getkey(cfg->startkey, d->key, keylen);
320 if ((cfg->bits & MPPE_40) != 0)
321 bcopy(&ng_mppe_weakenkey, d->key, 3);
322 else if ((cfg->bits & MPPE_56) != 0)
323 bcopy(&ng_mppe_weakenkey, d->key, 1);
324 rc4_init(&d->rc4, d->key, keylen);
328 /* Initialize other state */
334 case NGM_MPPC_RESETREQ:
335 ng_mppc_reset_req(node);
348 NG_RESPOND_MSG(error, node, item, resp);
354 * Receive incoming data on our hook.
357 ng_mppc_rcvdata(hook_p hook, item_p item)
359 const node_p node = NG_HOOK_NODE(hook);
360 const priv_p priv = NG_NODE_PRIVATE(node);
365 /* Compress and/or encrypt */
366 if (hook == priv->xmit.hook) {
367 if (!priv->xmit.cfg.enable) {
372 if ((error = ng_mppc_compress(node, &m)) != 0) {
376 NG_FWD_NEW_DATA(error, item, priv->xmit.hook, m);
380 /* Decompress and/or decrypt */
381 if (hook == priv->recv.hook) {
382 if (!priv->recv.cfg.enable) {
387 if ((error = ng_mppc_decompress(node, &m)) != 0) {
389 if (error == EINVAL && priv->ctrlnode != 0) {
392 /* Need to send a reset-request */
393 NG_MKMESSAGE(msg, NGM_MPPC_COOKIE,
394 NGM_MPPC_RESETREQ, 0, M_WAITOK | M_NULLOK);
397 NG_SEND_MSG_ID(error, node, msg,
402 NG_FWD_NEW_DATA(error, item, priv->recv.hook, m);
407 panic("%s: unknown hook", __func__);
408 #ifdef RESTARTABLE_PANICS
417 ng_mppc_shutdown(node_p node)
419 const priv_p priv = NG_NODE_PRIVATE(node);
421 /* Take down netgraph node */
422 #ifdef NETGRAPH7_MPPC_COMPRESSION
423 if (priv->xmit.history != NULL)
424 kfree(priv->xmit.history, M_NETGRAPH_MPPC);
425 if (priv->recv.history != NULL)
426 kfree(priv->recv.history, M_NETGRAPH_MPPC);
428 bzero(priv, sizeof(*priv));
429 kfree(priv, M_NETGRAPH_MPPC);
430 NG_NODE_SET_PRIVATE(node, NULL);
431 NG_NODE_UNREF(node); /* let the node escape */
439 ng_mppc_disconnect(hook_p hook)
441 const node_p node = NG_HOOK_NODE(hook);
442 const priv_p priv = NG_NODE_PRIVATE(node);
444 /* Zero out hook pointer */
445 if (hook == priv->xmit.hook)
446 priv->xmit.hook = NULL;
447 if (hook == priv->recv.hook)
448 priv->recv.hook = NULL;
450 /* Go away if no longer connected */
451 if ((NG_NODE_NUMHOOKS(node) == 0)
452 && NG_NODE_IS_VALID(node))
453 ng_rmnode_self(node);
457 /************************************************************************
459 ************************************************************************/
462 * Compress/encrypt a packet and put the result in a new mbuf at *resultp.
463 * The original mbuf is not free'd.
466 ng_mppc_compress(node_p node, struct mbuf **datap)
468 const priv_p priv = NG_NODE_PRIVATE(node);
469 struct ng_mppc_dir *const d = &priv->xmit;
471 struct mbuf *m = *datap;
476 /* Always set the flushed bit in stateless mode */
477 if (d->flushed || ((d->cfg.bits & MPPE_STATELESS) != 0)) {
478 header |= MPPC_FLAG_FLUSHED;
482 /* Compress packet (if compression enabled) */
483 #ifdef NETGRAPH7_MPPC_COMPRESSION
484 if ((d->cfg.bits & MPPC_BIT) != 0) {
485 u_short flags = MPPC_MANDATORY_COMPRESS_FLAGS;
486 u_char *inbuf, *outbuf;
488 u_char *source, *dest;
489 u_long sourceCnt, destCnt;
492 /* Work with contiguous regions of memory. */
493 inlen = m->m_pkthdr.len;
494 inbuf = kmalloc(inlen, M_NETGRAPH_MPPC, M_WAITOK | M_NULLOK);
499 m_copydata(m, 0, inlen, (caddr_t)inbuf);
501 outlen = MPPC_MAX_BLOWUP(inlen);
502 outbuf = kmalloc(outlen, M_NETGRAPH_MPPC, M_WAITOK | M_NULLOK);
503 if (outbuf == NULL) {
505 kfree(inbuf, M_NETGRAPH_MPPC);
509 /* Prepare to compress */
514 if ((d->cfg.bits & MPPE_STATELESS) == 0)
515 flags |= MPPC_SAVE_HISTORY;
518 rtn = MPPC_Compress(&source, &dest, &sourceCnt,
519 &destCnt, d->history, flags, 0);
521 /* Check return value */
522 KASSERT(rtn != MPPC_INVALID, ("%s: invalid", __func__));
523 if ((rtn & MPPC_EXPANDED) == 0
524 && (rtn & MPPC_COMP_OK) == MPPC_COMP_OK) {
526 header |= MPPC_FLAG_COMPRESSED;
527 if ((rtn & MPPC_RESTART_HISTORY) != 0)
528 header |= MPPC_FLAG_RESTART;
530 /* Replace m by the compresed one. */
532 m = m_devget((caddr_t)outbuf, outlen, 0, NULL);
534 d->flushed = (rtn & MPPC_EXPANDED) != 0
535 || (flags & MPPC_SAVE_HISTORY) == 0;
537 kfree(inbuf, M_NETGRAPH_MPPC);
538 kfree(outbuf, M_NETGRAPH_MPPC);
540 /* Check m_devget() result. */
546 /* Now encrypt packet (if encryption enabled) */
547 #ifdef NETGRAPH7_MPPC_ENCRYPTION
548 if ((d->cfg.bits & MPPE_BITS) != 0) {
551 /* Set header bits */
552 header |= MPPC_FLAG_ENCRYPTED;
554 /* Update key if it's time */
555 if ((d->cfg.bits & MPPE_STATELESS) != 0
556 || (d->cc & MPPE_UPDATE_MASK) == MPPE_UPDATE_FLAG) {
557 ng_mppc_updatekey(d->cfg.bits,
558 d->cfg.startkey, d->key, &d->rc4);
559 } else if ((header & MPPC_FLAG_FLUSHED) != 0) {
560 /* Need to reset key if we say we did
561 and ng_mppc_updatekey wasn't called to do it also. */
562 rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
565 /* We must own the mbuf chain exclusively to modify it. */
566 m = m_unshare(m, M_NOWAIT);
573 rc4_crypt(&d->rc4, mtod(m1, u_char *),
574 mtod(m1, u_char *), m1->m_len);
580 /* Update coherency count for next time (12 bit arithmetic) */
581 MPPC_CCOUNT_INC(d->cc);
584 M_PREPEND(m, MPPC_HDRLEN, M_NOWAIT);
586 *(mtod(m, uint16_t *)) = htons(header);
589 return (*datap == NULL ? ENOBUFS : 0);
593 * Decompress/decrypt packet and put the result in a new mbuf at *resultp.
594 * The original mbuf is not free'd.
597 ng_mppc_decompress(node_p node, struct mbuf **datap)
599 const priv_p priv = NG_NODE_PRIVATE(node);
600 struct ng_mppc_dir *const d = &priv->recv;
601 u_int16_t header, cc;
603 struct mbuf *m = *datap;
605 /* Pull off header */
606 if (m->m_pkthdr.len < MPPC_HDRLEN) {
610 m_copydata(m, 0, MPPC_HDRLEN, (caddr_t)&header);
611 header = ntohs(header);
612 cc = (header & MPPC_CCOUNT_MASK);
613 m_adj(m, MPPC_HDRLEN);
615 /* Check for an unexpected jump in the sequence number */
616 numLost = ((cc - d->cc) & MPPC_CCOUNT_MASK);
618 /* If flushed bit set, we can always handle packet */
619 if ((header & MPPC_FLAG_FLUSHED) != 0) {
620 #ifdef NETGRAPH7_MPPC_COMPRESSION
621 if (d->history != NULL)
622 MPPC_InitDecompressionHistory(d->history);
624 #ifdef NETGRAPH7_MPPC_ENCRYPTION
625 if ((d->cfg.bits & MPPE_BITS) != 0) {
628 /* How many times are we going to have to re-key? */
629 rekey = ((d->cfg.bits & MPPE_STATELESS) != 0) ?
630 numLost : (numLost / (MPPE_UPDATE_MASK + 1));
631 if (rekey > MPPE_MAX_REKEY) {
632 log(LOG_ERR, "%s: too many (%d) packets"
633 " dropped, disabling node %p!",
634 __func__, numLost, node);
635 priv->recv.cfg.enable = 0;
639 /* Re-key as necessary to catch up to peer */
640 while (d->cc != cc) {
641 if ((d->cfg.bits & MPPE_STATELESS) != 0
642 || (d->cc & MPPE_UPDATE_MASK)
643 == MPPE_UPDATE_FLAG) {
644 ng_mppc_updatekey(d->cfg.bits,
645 d->cfg.startkey, d->key, &d->rc4);
647 MPPC_CCOUNT_INC(d->cc);
650 /* Reset key (except in stateless mode, see below) */
651 if ((d->cfg.bits & MPPE_STATELESS) == 0)
652 rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
655 d->cc = cc; /* skip over lost seq numbers */
656 numLost = 0; /* act like no packets were lost */
659 /* Can't decode non-sequential packets without a flushed bit */
664 if ((header & MPPC_FLAG_ENCRYPTED) != 0) {
665 #ifdef NETGRAPH7_MPPC_ENCRYPTION
669 /* Are we not expecting encryption? */
670 if ((d->cfg.bits & MPPE_BITS) == 0) {
671 log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
672 __func__, "encrypted");
676 #ifdef NETGRAPH7_MPPC_ENCRYPTION
677 /* Update key if it's time (always in stateless mode) */
678 if ((d->cfg.bits & MPPE_STATELESS) != 0
679 || (d->cc & MPPE_UPDATE_MASK) == MPPE_UPDATE_FLAG) {
680 ng_mppc_updatekey(d->cfg.bits,
681 d->cfg.startkey, d->key, &d->rc4);
684 /* We must own the mbuf chain exclusively to modify it. */
685 m = m_unshare(m, M_NOWAIT);
692 rc4_crypt(&d->rc4, mtod(m1, u_char *),
693 mtod(m1, u_char *), m1->m_len);
699 /* Are we expecting encryption? */
700 if ((d->cfg.bits & MPPE_BITS) != 0) {
701 log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
702 __func__, "unencrypted");
707 /* Update coherency count for next time (12 bit arithmetic) */
708 MPPC_CCOUNT_INC(d->cc);
710 /* Check for unexpected compressed packet */
711 if ((header & MPPC_FLAG_COMPRESSED) != 0
712 && (d->cfg.bits & MPPC_BIT) == 0) {
713 log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
714 __func__, "compressed");
720 #ifdef NETGRAPH7_MPPC_COMPRESSION
721 /* Decompress packet */
722 if ((header & MPPC_FLAG_COMPRESSED) != 0) {
723 int flags = MPPC_MANDATORY_DECOMPRESS_FLAGS;
724 u_char *decompbuf, *source, *dest;
725 u_long sourceCnt, destCnt;
730 /* Copy payload into a contiguous region of memory. */
731 len = m->m_pkthdr.len;
732 buf = kmalloc(len, M_NETGRAPH_MPPC, M_WAITOK | M_NULLOK);
737 m_copydata(m, 0, len, (caddr_t)buf);
739 /* Allocate a buffer for decompressed data */
740 decompbuf = kmalloc(MPPC_DECOMP_BUFSIZE + MPPC_DECOMP_SAFETY,
741 M_NETGRAPH_MPPC, M_WAITOK | M_NULLOK);
742 if (decompbuf == NULL) {
744 kfree(buf, M_NETGRAPH_MPPC);
747 decomplen = MPPC_DECOMP_BUFSIZE;
749 /* Prepare to decompress */
754 if ((header & MPPC_FLAG_RESTART) != 0)
755 flags |= MPPC_RESTART_HISTORY;
758 rtn = MPPC_Decompress(&source, &dest,
759 &sourceCnt, &destCnt, d->history, flags);
761 /* Check return value */
762 KASSERT(rtn != MPPC_INVALID, ("%s: invalid", __func__));
763 if ((rtn & MPPC_DEST_EXHAUSTED) != 0
764 || (rtn & MPPC_DECOMP_OK) != MPPC_DECOMP_OK) {
765 log(LOG_ERR, "%s: decomp returned 0x%x",
767 kfree(buf, M_NETGRAPH_MPPC);
768 kfree(decompbuf, M_NETGRAPH_MPPC);
772 /* Replace compressed data with decompressed data */
773 kfree(buf, M_NETGRAPH_MPPC);
774 len = decomplen - destCnt;
777 m = m_devget((caddr_t)decompbuf, len, 0, NULL);
778 kfree(decompbuf, M_NETGRAPH_MPPC);
782 /* Return result in an mbuf */
784 return (*datap == NULL ? ENOBUFS : 0);
788 * The peer has sent us a CCP ResetRequest, so reset our transmit state.
791 ng_mppc_reset_req(node_p node)
793 const priv_p priv = NG_NODE_PRIVATE(node);
794 struct ng_mppc_dir *const d = &priv->xmit;
796 #ifdef NETGRAPH7_MPPC_COMPRESSION
797 if (d->history != NULL)
798 MPPC_InitCompressionHistory(d->history);
800 #ifdef NETGRAPH7_MPPC_ENCRYPTION
801 if ((d->cfg.bits & MPPE_STATELESS) == 0)
802 rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
807 #ifdef NETGRAPH7_MPPC_ENCRYPTION
809 * Generate a new encryption key
812 ng_mppc_getkey(const u_char *h, u_char *h2, int len)
814 static const u_char pad1[10] =
815 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, };
816 static const u_char pad2[10] =
817 { 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, };
823 SHA1Update(&c, h, len);
824 for (k = 0; k < 4; k++)
825 SHA1Update(&c, pad1, sizeof(pad1));
826 SHA1Update(&c, h2, len);
827 for (k = 0; k < 4; k++)
828 SHA1Update(&c, pad2, sizeof(pad2));
830 bcopy(hash, h2, len);
834 * Update the encryption key
837 ng_mppc_updatekey(u_int32_t bits,
838 u_char *key0, u_char *key, struct rc4_state *rc4)
840 const int keylen = KEYLEN(bits);
842 ng_mppc_getkey(key0, key, keylen);
843 rc4_init(rc4, key, keylen);
844 rc4_crypt(rc4, key, key, keylen);
845 if ((bits & MPPE_40) != 0)
846 bcopy(&ng_mppe_weakenkey, key, 3);
847 else if ((bits & MPPE_56) != 0)
848 bcopy(&ng_mppe_weakenkey, key, 1);
849 rc4_init(rc4, key, keylen);