ah-sha1 + esp-3des + indentation

1 files changed, 290 insertions, 289 deletions

diff --git a/sys/netinet/ip_ahhmacmd5.c b/sys/netinet/ip_ahhmacmd5.c
index 5c42d67f793..109d1c4b027 100644
--- a/sys/netinet/ip_ahhmacmd5.c
+++ b/sys/netinet/ip_ahhmacmd5.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_ahhmacmd5.c,v 1.7 1997/03/30 22:05:12 mickey Exp $	*/
+/*	$OpenBSD: ip_ahhmacmd5.c,v 1.8 1997/06/20 05:41:47 provos Exp $	*/
 
 /*
  * The author of this code is John Ioannidis, ji@tla.org,
@@ -68,7 +68,7 @@
 int
 ahhmacmd5_attach()
 {
-	return 0;
+    return 0;
 }
 
 /*
@@ -79,52 +79,53 @@ ahhmacmd5_attach()
 int
 ahhmacmd5_init(struct tdb *tdbp, struct xformsw *xsp, struct mbuf *m)
 {
-	struct ahhmacmd5_xdata *xd;
-	struct ahhmacmd5_xencap txd;
-	struct encap_msghdr *em;
-	int len;
+    struct ahhmacmd5_xdata *xd;
+    struct ahhmacmd5_xencap txd;
+    struct encap_msghdr *em;
+    int len;
 	
-	tdbp->tdb_xform = xsp;
-
-	MALLOC(tdbp->tdb_xdata, caddr_t, sizeof (struct ahhmacmd5_xdata),
-	       M_XDATA, M_WAITOK);
-	if (tdbp->tdb_xdata == NULL)
-	  return ENOBUFS;
-	bzero(tdbp->tdb_xdata, sizeof (struct ahhmacmd5_xdata));
-	bzero(&txd, sizeof(struct ahhmacmd5_xencap));
-	xd = (struct ahhmacmd5_xdata *)tdbp->tdb_xdata;
-
-	em = mtod(m, struct encap_msghdr *);
-	if (em->em_msglen - EMT_SETSPI_FLEN > sizeof (struct ahhmacmd5_xencap))
-	{
-		free((caddr_t)tdbp->tdb_xdata, M_XDATA);
-		tdbp->tdb_xdata = NULL;
-		return EINVAL;
-	}
+    tdbp->tdb_xform = xsp;
+
+    MALLOC(tdbp->tdb_xdata, caddr_t, sizeof (struct ahhmacmd5_xdata),
+	   M_XDATA, M_WAITOK);
+    if (tdbp->tdb_xdata == NULL)
+      return ENOBUFS;
+    bzero(tdbp->tdb_xdata, sizeof (struct ahhmacmd5_xdata));
+    bzero(&txd, sizeof(struct ahhmacmd5_xencap));
+    xd = (struct ahhmacmd5_xdata *)tdbp->tdb_xdata;
+
+    em = mtod(m, struct encap_msghdr *);
+    if (em->em_msglen - EMT_SETSPI_FLEN > sizeof (struct ahhmacmd5_xencap))
+    {
+	free((caddr_t)tdbp->tdb_xdata, M_XDATA);
+	tdbp->tdb_xdata = NULL;
+	return EINVAL;
+    }
 	
-	m_copydata(m, EMT_SETSPI_FLEN, em->em_msglen - EMT_SETSPI_FLEN, (caddr_t)&txd);
+    m_copydata(m, EMT_SETSPI_FLEN, em->em_msglen - EMT_SETSPI_FLEN, 
+	       (caddr_t)&txd);
 
-	xd->amx_rpl = 1;
-	xd->amx_alen = txd.amx_alen;
-	xd->amx_bitmap = 0;
-	xd->amx_wnd = txd.amx_wnd;
+    xd->amx_rpl = 1;
+    xd->amx_alen = txd.amx_alen;
+    xd->amx_bitmap = 0;
+    xd->amx_wnd = txd.amx_wnd;
 	
-	MD5Init(&(xd->amx_ictx));
-	MD5Init(&(xd->amx_octx));
+    MD5Init(&(xd->amx_ictx));
+    MD5Init(&(xd->amx_octx));
 	
-	for (len = 0; len < AHHMACMD5_KMAX; len++)
-	  txd.amx_key[len] ^= HMACMD5_IPAD_VAL;
+    for (len = 0; len < AHHMACMD5_KMAX; len++)
+      txd.amx_key[len] ^= HMACMD5_IPAD_VAL;
 
-	MD5Update(&(xd->amx_ictx), txd.amx_key, AHHMACMD5_KMAX);
+    MD5Update(&(xd->amx_ictx), txd.amx_key, AHHMACMD5_KMAX);
 
-	for (len = 0; len < AHHMACMD5_KMAX; len++)
-	  txd.amx_key[len] ^= (HMACMD5_IPAD_VAL ^ HMACMD5_OPAD_VAL);
+    for (len = 0; len < AHHMACMD5_KMAX; len++)
+      txd.amx_key[len] ^= (HMACMD5_IPAD_VAL ^ HMACMD5_OPAD_VAL);
 
-	MD5Update(&(xd->amx_octx), txd.amx_key, AHHMACMD5_KMAX);
-	bzero(&txd, sizeof(struct ahhmacmd5_xencap));
-	bzero(ipseczeroes, IPSEC_ZEROES_SIZE);	/* paranoid */
+    MD5Update(&(xd->amx_octx), txd.amx_key, AHHMACMD5_KMAX);
+    bzero(&txd, sizeof(struct ahhmacmd5_xencap));
+    bzero(ipseczeroes, IPSEC_ZEROES_SIZE);	/* paranoid */
 
-	return 0;
+    return 0;
 }
 
 /*
@@ -134,8 +135,8 @@ ahhmacmd5_init(struct tdb *tdbp, struct xformsw *xsp, struct mbuf *m)
 int
 ahhmacmd5_zeroize(struct tdb *tdbp)
 {
-	FREE(tdbp->tdb_xdata, M_XDATA);
-	return 0;
+    FREE(tdbp->tdb_xdata, M_XDATA);
+    return 0;
 }
 
 /*
@@ -148,171 +149,171 @@ extern struct ifnet loif;
 struct mbuf *
 ahhmacmd5_input(struct mbuf *m, struct tdb *tdb)
 {
-	struct ahhmacmd5_xdata *xd;
-	struct ip *ip, ipo;
-	struct ah *ah;
-	struct ahhmacmd5 aho, *ahp;
-	struct ifnet *rcvif;
-	int ohlen, len, count, off, ado, errc;
-	u_int64_t btsx;
-	struct mbuf *m0;
-	MD5_CTX ctx; 
+    struct ahhmacmd5_xdata *xd;
+    struct ip *ip, ipo;
+    struct ah *ah;
+    struct ahhmacmd5 aho, *ahp;
+    struct ifnet *rcvif;
+    int ohlen, len, count, off, ado, errc;
+    u_int64_t btsx;
+    struct mbuf *m0;
+    MD5_CTX ctx; 
 	
-	xd = (struct ahhmacmd5_xdata *)tdb->tdb_xdata;
-	ohlen = sizeof (struct ip) + AH_FLENGTH + xd->amx_alen;
-	if (xd->amx_wnd >= 0)
-	  ohlen += HMACMD5_RPLENGTH;
-
-	rcvif = m->m_pkthdr.rcvif;
-	if (rcvif == NULL)
-	{
+    xd = (struct ahhmacmd5_xdata *)tdb->tdb_xdata;
+    ohlen = sizeof (struct ip) + AH_FLENGTH + xd->amx_alen;
+    if (xd->amx_wnd >= 0)
+      ohlen += HMACMD5_RPLENGTH;
+
+    rcvif = m->m_pkthdr.rcvif;
+    if (rcvif == NULL)
+    {
 #ifdef ENCDEBUG
-		if (encdebug)
-		  printf("ahhmacmd5_input: receive interface is NULL!!!\n");
+	if (encdebug)
+	  printf("ahhmacmd5_input: receive interface is NULL!!!\n");
 #endif
-		rcvif = &loif;
-	}
+	rcvif = &loif;
+    }
 	
-	if (m->m_len < ohlen)
+    if (m->m_len < ohlen)
+    {
+	if ((m = m_pullup(m, ohlen)) == NULL)
 	{
-		if ((m = m_pullup(m, ohlen)) == NULL)
-		{
-			ahstat.ahs_hdrops++;
-			return NULL;
-		}
+	    ahstat.ahs_hdrops++;
+	    return NULL;
 	}
+    }
 
-	ip = mtod(m, struct ip *);
-	ah = (struct ah *)(ip + 1);
-	ahp = (struct ahhmacmd5 *)ah;
+    ip = mtod(m, struct ip *);
+    ah = (struct ah *)(ip + 1);
+    ahp = (struct ahhmacmd5 *)ah;
 
-        if (xd->amx_wnd >= 0)
-          ado = HMACMD5_RPLENGTH;
-        else
-          ado = 0;
+    if (xd->amx_wnd >= 0)
+      ado = HMACMD5_RPLENGTH;
+    else
+      ado = 0;
 
-        if (ah->ah_hl * sizeof(u_int32_t) != xd->amx_alen + ado)
-        {
+    if (ah->ah_hl * sizeof(u_int32_t) != xd->amx_alen + ado)
+    {
 #ifdef ENCDEBUG
-                if (encdebug)
-                  printf("ahhmacmd5_input: bad authenticator length\n");
+	if (encdebug)
+	  printf("ahhmacmd5_input: bad authenticator length\n");
 #endif
-                ahstat.ahs_badauthl++;
-                m_freem(m);
-                return NULL;
-        }
-
-	ipo = *ip;
-	ipo.ip_tos = 0;
-	ipo.ip_len += sizeof (struct ip);	/* adjusted in ip_intr() */
-	HTONS(ipo.ip_len);
-	HTONS(ipo.ip_id);
-	ipo.ip_off = htons(ipo.ip_off & IP_DF);	/* XXX -- and the C bit? */
-	ipo.ip_ttl = 0;
-	ipo.ip_sum = 0;
-
-	ctx = xd->amx_ictx;
-	MD5Update(&ctx, (unsigned char *)&ipo, sizeof (struct ip));
-	if (xd->amx_wnd >= 0)
-	  MD5Update(&ctx, (unsigned char *)ahp, AH_FLENGTH + HMACMD5_RPLENGTH);
-	else
-	  MD5Update(&ctx, (unsigned char *)ahp, AH_FLENGTH);
-	MD5Update(&ctx, ipseczeroes, xd->amx_alen);
-
-	/*
-	 * Code shamelessly stolen from m_copydata
-	 */
-	off = ohlen;
-	len = m->m_pkthdr.len - off;
-	m0 = m;
+	ahstat.ahs_badauthl++;
+	m_freem(m);
+	return NULL;
+    }
+
+    ipo = *ip;
+    ipo.ip_tos = 0;
+    ipo.ip_len += sizeof (struct ip);	/* adjusted in ip_intr() */
+    HTONS(ipo.ip_len);
+    HTONS(ipo.ip_id);
+    ipo.ip_off = htons(ipo.ip_off & IP_DF);	/* XXX -- and the C bit? */
+    ipo.ip_ttl = 0;
+    ipo.ip_sum = 0;
+
+    ctx = xd->amx_ictx;
+    MD5Update(&ctx, (unsigned char *)&ipo, sizeof (struct ip));
+    if (xd->amx_wnd >= 0)
+      MD5Update(&ctx, (unsigned char *)ahp, AH_FLENGTH + HMACMD5_RPLENGTH);
+    else
+      MD5Update(&ctx, (unsigned char *)ahp, AH_FLENGTH);
+    MD5Update(&ctx, ipseczeroes, xd->amx_alen);
+
+    /*
+     * Code shamelessly stolen from m_copydata
+     */
+    off = ohlen;
+    len = m->m_pkthdr.len - off;
+    m0 = m;
 	
-	while (off > 0)
-	{
-		if (m0 == 0)
-		  panic("ahhmacmd5_input: m_copydata (off)");
-		if (off < m0->m_len)
-		  break;
-		off -= m0->m_len;
-		m0 = m0->m_next;
-	}
-
-	while (len > 0)
-	{
-		if (m0 == 0)
-		  panic("ahhmacmd5_input: m_copydata (copy)");
-		count = min(m0->m_len - off, len);
-		MD5Update(&ctx, mtod(m0, unsigned char *) + off, count);
-		len -= count;
-		off = 0;
-		m0 = m0->m_next;
-	}
+    while (off > 0)
+    {
+	if (m0 == 0)
+	  panic("ahhmacmd5_input: m_copydata (off)");
+	if (off < m0->m_len)
+	  break;
+	off -= m0->m_len;
+	m0 = m0->m_next;
+    }
+
+    while (len > 0)
+    {
+	if (m0 == 0)
+	  panic("ahhmacmd5_input: m_copydata (copy)");
+	count = min(m0->m_len - off, len);
+	MD5Update(&ctx, mtod(m0, unsigned char *) + off, count);
+	len -= count;
+	off = 0;
+	m0 = m0->m_next;
+    }
 
-	MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
-	ctx = xd->amx_octx;
-	MD5Update(&ctx, (unsigned char *)(&(aho.ah_data[0])), HMACMD5_HASHLEN);
-	MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
+    MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
+    ctx = xd->amx_octx;
+    MD5Update(&ctx, (unsigned char *)(&(aho.ah_data[0])), HMACMD5_HASHLEN);
+    MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
 
-	if (bcmp(aho.ah_data, ah->ah_data + ado, xd->amx_alen))
-	{
+    if (bcmp(aho.ah_data, ah->ah_data + ado, xd->amx_alen))
+    {
 #ifdef ENCDEBUG
-		if (encdebug)
-		  printf("ahhmacmd5_input: bad auth\n"); /* XXX */
+	if (encdebug)
+	  printf("ahhmacmd5_input: bad auth\n"); /* XXX */
 #endif
-		ahstat.ahs_badauth++;
-		m_freem(m);
-		return NULL;
-	}
+	ahstat.ahs_badauth++;
+	m_freem(m);
+	return NULL;
+    }
 	
-	if (xd->amx_wnd >= 0)
+    if (xd->amx_wnd >= 0)
+    {
+	btsx = ntohq(ahp->ah_rpl);
+	if ((errc = checkreplaywindow64(btsx, &(xd->amx_rpl), 
+					xd->amx_wnd, &(xd->amx_bitmap)))
+	    != 0)
 	{
-	    	btsx = ntohq(ahp->ah_rpl);
-		if ((errc = checkreplaywindow64(btsx, &(xd->amx_rpl), 
-					       xd->amx_wnd, &(xd->amx_bitmap)))
-		    != 0)
-		{
-			switch(errc)
-			{
-				case 1:
+	    switch(errc)
+	    {
+		case 1:
 #ifdef ENCDEBUG
-					printf("ahhmacmd5_input: replay counter wrapped\n");
+		    printf("ahhmacmd5_input: replay counter wrapped\n");
 #endif
-					ahstat.ahs_wrap++;
-					break;
-				case 2:
+		    ahstat.ahs_wrap++;
+		    break;
+		case 2:
 #ifdef ENCDEBUG
-					printf("ahhmacmd5_input: received old packet\n");
+		    printf("ahhmacmd5_input: received old packet\n");
 #endif
-					ahstat.ahs_replay++;
-					break;
-				case 3:
+		    ahstat.ahs_replay++;
+		    break;
+		case 3:
 #ifdef ENCDEBUG
-					printf("ahhmacmd5_input: packet already received\n");
+		    printf("ahhmacmd5_input: packet already received\n");
 #endif
-					ahstat.ahs_replay++;
-					break;
-			}
-			m_freem(m);
-			return NULL;
-		}
+		    ahstat.ahs_replay++;
+		    break;
+	    }
+	    m_freem(m);
+	    return NULL;
 	}
+    }
 	
-	ipo = *ip;
-	ipo.ip_p = ah->ah_nh;
-
-	m->m_len -= (ohlen - sizeof(struct ip));
-	m->m_data += (ohlen - sizeof(struct ip));
-	m->m_pkthdr.len -= (ohlen - sizeof(struct ip));
-	m->m_pkthdr.rcvif = rcvif;	/* this should not be necessary */
-
-	ip = mtod(m, struct ip *);
-	*ip = ipo;
-	ip->ip_len = htons(ip->ip_len - ohlen + 2 * sizeof (struct ip));
-	HTONS(ip->ip_id);
-	HTONS(ip->ip_off);
-	ip->ip_sum = 0;
-	ip->ip_sum = in_cksum(m, sizeof (struct ip));
-
-	return m;
+    ipo = *ip;
+    ipo.ip_p = ah->ah_nh;
+
+    m->m_len -= (ohlen - sizeof(struct ip));
+    m->m_data += (ohlen - sizeof(struct ip));
+    m->m_pkthdr.len -= (ohlen - sizeof(struct ip));
+    m->m_pkthdr.rcvif = rcvif;	/* this should not be necessary */
+
+    ip = mtod(m, struct ip *);
+    *ip = ipo;
+    ip->ip_len = htons(ip->ip_len - ohlen + 2 * sizeof (struct ip));
+    HTONS(ip->ip_id);
+    HTONS(ip->ip_off);
+    ip->ip_sum = 0;
+    ip->ip_sum = in_cksum(m, sizeof (struct ip));
+
+    return m;
 }
 
 
@@ -321,143 +322,143 @@ ahhmacmd5_input(struct mbuf *m, struct tdb *tdb)
 int
 ahhmacmd5_output(struct mbuf *m, struct sockaddr_encap *gw, struct tdb *tdb, struct mbuf **mp)
 {
-	struct ahhmacmd5_xdata *xd;
-	struct ip *ip, ipo;
-	struct ah *ah;
-	struct ahhmacmd5 *ahp, aho;
-	register int len, off, count;
-	register struct mbuf *m0;
-	MD5_CTX ctx;
-	int ilen, ohlen;
+    struct ahhmacmd5_xdata *xd;
+    struct ip *ip, ipo;
+    struct ah *ah;
+    struct ahhmacmd5 *ahp, aho;
+    register int len, off, count;
+    register struct mbuf *m0;
+    MD5_CTX ctx;
+    int ilen, ohlen;
 	
-	ahstat.ahs_output++;
-	m = m_pullup(m, sizeof (struct ip));
-	if (m == NULL)
-	  return ENOBUFS;
+    ahstat.ahs_output++;
+    m = m_pullup(m, sizeof (struct ip));
+    if (m == NULL)
+      return ENOBUFS;
 	
-	ip = mtod(m, struct ip *);
+    ip = mtod(m, struct ip *);
 	
-	xd = (struct ahhmacmd5_xdata *)tdb->tdb_xdata;
+    xd = (struct ahhmacmd5_xdata *)tdb->tdb_xdata;
 
-	ilen = ntohs(ip->ip_len);
+    ilen = ntohs(ip->ip_len);
 
 #ifdef AHXPORT
-	ohlen = AH_FLENGTH + xd->amx_alen;
+    ohlen = AH_FLENGTH + xd->amx_alen;
 #else
-	ohlen = sizeof (struct ip) + AH_FLENGTH + xd->amx_alen;
+    ohlen = sizeof (struct ip) + AH_FLENGTH + xd->amx_alen;
 #endif
-	if (xd->amx_wnd >= 0)
-	  ohlen += HMACMD5_RPLENGTH;
-
-	ipo.ip_v = IPVERSION;
-	ipo.ip_hl = 5;
-	ipo.ip_tos = 0;
-	ipo.ip_len = htons(ohlen + ilen);
-	ipo.ip_id = ip->ip_id;
-	ipo.ip_off = htons(ntohs(ip->ip_off) & IP_DF);
-	ipo.ip_ttl = 0;
-	ipo.ip_p = IPPROTO_AH;
-	ipo.ip_sum = 0;
+    if (xd->amx_wnd >= 0)
+      ohlen += HMACMD5_RPLENGTH;
+
+    ipo.ip_v = IPVERSION;
+    ipo.ip_hl = 5;
+    ipo.ip_tos = 0;
+    ipo.ip_len = htons(ohlen + ilen);
+    ipo.ip_id = ip->ip_id;
+    ipo.ip_off = htons(ntohs(ip->ip_off) & IP_DF);
+    ipo.ip_ttl = 0;
+    ipo.ip_p = IPPROTO_AH;
+    ipo.ip_sum = 0;
 #ifdef AHXPORT
-	ipo.ip_src = ip->ip_src;
-	ipo.ip_dst = ip->ip_dst;
-	aho.ah_nh = ip->ip_p;
+    ipo.ip_src = ip->ip_src;
+    ipo.ip_dst = ip->ip_dst;
+    aho.ah_nh = ip->ip_p;
 #else
-	ipo.ip_src = gw->sen_ipsp_src;
-	ipo.ip_dst = gw->sen_ipsp_dst;
-	aho.ah_nh = IPPROTO_IP4;
+    ipo.ip_src = gw->sen_ipsp_src;
+    ipo.ip_dst = gw->sen_ipsp_dst;
+    aho.ah_nh = IPPROTO_IP4;
 #endif
-	aho.ah_hl = (xd->amx_alen >> 2);
-	if (xd->amx_wnd >= 0)
-	  aho.ah_hl += (HMACMD5_RPLENGTH / sizeof(u_int32_t));
-	aho.ah_rv = 0;
-	aho.ah_spi = tdb->tdb_spi;
-
-	if (xd->amx_wnd >= 0)
+    aho.ah_hl = (xd->amx_alen >> 2);
+    if (xd->amx_wnd >= 0)
+      aho.ah_hl += (HMACMD5_RPLENGTH / sizeof(u_int32_t));
+    aho.ah_rv = 0;
+    aho.ah_spi = tdb->tdb_spi;
+
+    if (xd->amx_wnd >= 0)
+    {
+	if (xd->amx_rpl == 0)
 	{
-	    if (xd->amx_rpl == 0)
-	    {
 #ifdef ENCDEBUG
-		printf("ahhmacmd5_output: key should have changed long ago\n");
+	    printf("ahhmacmd5_output: key should have changed long ago\n");
 #endif
-		ahstat.ahs_wrap++;
-		return NULL;
-	    }
+	    ahstat.ahs_wrap++;
+	    return NULL;
 	}
+    }
 
-        aho.ah_rpl = htonq(xd->amx_rpl++);
+    aho.ah_rpl = htonq(xd->amx_rpl++);
 
-	ctx = xd->amx_ictx;
-	MD5Update(&ctx, (unsigned char *)&ipo, sizeof (struct ip));
-	if (xd->amx_wnd >= 0)
-	  MD5Update(&ctx, (unsigned char *)&aho, AH_FLENGTH + HMACMD5_RPLENGTH);
-	else
-	  MD5Update(&ctx, (unsigned char *)&aho, AH_FLENGTH);
-	MD5Update(&ctx, ipseczeroes, xd->amx_alen);
+    ctx = xd->amx_ictx;
+    MD5Update(&ctx, (unsigned char *)&ipo, sizeof (struct ip));
+    if (xd->amx_wnd >= 0)
+      MD5Update(&ctx, (unsigned char *)&aho, AH_FLENGTH + HMACMD5_RPLENGTH);
+    else
+      MD5Update(&ctx, (unsigned char *)&aho, AH_FLENGTH);
+    MD5Update(&ctx, ipseczeroes, xd->amx_alen);
 
 #ifdef AHXPORT
-	off = sizeof (struct ip);
+    off = sizeof (struct ip);
 #else	
-	off = 0;
+    off = 0;
 #endif
 
-	/*
-	 * Code shamelessly stolen from m_copydata
-	 */
-	len = m->m_pkthdr.len - off;
+    /*
+     * Code shamelessly stolen from m_copydata
+     */
+    len = m->m_pkthdr.len - off;
 	
-	m0 = m;
+    m0 = m;
 
-	while (len > 0)
-	{
-		if (m0 == 0)
-		  panic("ahhmacmd5_output: m_copydata");
-		count = min(m0->m_len - off, len);
-		MD5Update(&ctx, mtod(m0, unsigned char *) + off, count);
-
-		len -= count;
-		off = 0;
-		m0 = m0->m_next;
-	}
-
-	MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
-	ctx = xd->amx_octx;
-	MD5Update(&ctx, (unsigned char *)(&(aho.ah_data[0])), HMACMD5_HASHLEN);
-	MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
+    while (len > 0)
+    {
+	if (m0 == 0)
+	  panic("ahhmacmd5_output: m_copydata");
+	count = min(m0->m_len - off, len);
+	MD5Update(&ctx, mtod(m0, unsigned char *) + off, count);
 
-	ipo.ip_tos = ip->ip_tos;
-	ipo.ip_id = ip->ip_id;
-	ipo.ip_off = ip->ip_off;
-	ipo.ip_ttl = ip->ip_ttl;
+	len -= count;
+	off = 0;
+	m0 = m0->m_next;
+    }
+
+    MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
+    ctx = xd->amx_octx;
+    MD5Update(&ctx, (unsigned char *)(&(aho.ah_data[0])), HMACMD5_HASHLEN);
+    MD5Final((unsigned char *)(&(aho.ah_data[0])), &ctx);
+
+    ipo.ip_tos = ip->ip_tos;
+    ipo.ip_id = ip->ip_id;
+    ipo.ip_off = ip->ip_off;
+    ipo.ip_ttl = ip->ip_ttl;
 /*	ipo.ip_len = ntohs(ipo.ip_len); */
 	
-	M_PREPEND(m, ohlen, M_DONTWAIT);
-	if (m == NULL)
-	  return ENOBUFS;
+    M_PREPEND(m, ohlen, M_DONTWAIT);
+    if (m == NULL)
+      return ENOBUFS;
 
-	m = m_pullup(m, ohlen + sizeof (struct ip));
-	if (m == NULL)
-	  return ENOBUFS;
+    m = m_pullup(m, ohlen + sizeof (struct ip));
+    if (m == NULL)
+      return ENOBUFS;
 	
-	ip = mtod(m, struct ip *);
-	ah = (struct ah *)(ip + 1);
-	ahp = (struct ahhmacmd5 *)ah; 
-	*ip = ipo;
-	ah->ah_nh = aho.ah_nh;
-	ah->ah_hl = aho.ah_hl;
-	ah->ah_rv = aho.ah_rv;
-	ah->ah_spi = aho.ah_spi;
-	if (xd->amx_wnd >= 0)
-	{
-	  	ahp->ah_rpl = aho.ah_rpl;
-		bcopy((unsigned char *)(&(aho.ah_data[0])), 
-		      ahp->ah_data, xd->amx_alen);
-	}
-	else
-	  bcopy((unsigned char *)(&(aho.ah_data[0])), 
-	        ah->ah_data, xd->amx_alen);
-
-	*mp = m;
+    ip = mtod(m, struct ip *);
+    ah = (struct ah *)(ip + 1);
+    ahp = (struct ahhmacmd5 *)ah; 
+    *ip = ipo;
+    ah->ah_nh = aho.ah_nh;
+    ah->ah_hl = aho.ah_hl;
+    ah->ah_rv = aho.ah_rv;
+    ah->ah_spi = aho.ah_spi;
+    if (xd->amx_wnd >= 0)
+    {
+	ahp->ah_rpl = aho.ah_rpl;
+	bcopy((unsigned char *)(&(aho.ah_data[0])), 
+	      ahp->ah_data, xd->amx_alen);
+    }
+    else
+      bcopy((unsigned char *)(&(aho.ah_data[0])), 
+	    ah->ah_data, xd->amx_alen);
+
+    *mp = m;
 	
-	return 0;
+    return 0;
 }