7293 Sun Secure Shell is neither

Reviewed by: Albert Lee <trisk@omniti.com>
Reviewed by: Alex Wilson <alex.wilson@joyent.com>
Reviewed by: Alexander Pyhalov <alp@rsu.ru>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Peter Tribble <peter.tribble@gmail.com>

1 files changed, 0 insertions, 711 deletions

diff --git a/usr/src/cmd/ssh/libssh/common/kex.c b/usr/src/cmd/ssh/libssh/common/kex.c
deleted file mode 100644
index 0eb9e780fa..0000000000
--- a/usr/src/cmd/ssh/libssh/common/kex.c
+++ /dev/null
@@ -1,711 +0,0 @@
-/*
- * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#include "includes.h"
-RCSID("$OpenBSD: kex.c,v 1.51 2002/06/24 14:55:38 markus Exp $");
-
-#include <locale.h>
-
-#include <openssl/crypto.h>
-
-#include "ssh2.h"
-#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
-#include "packet.h"
-#include "compat.h"
-#include "cipher.h"
-#include "kex.h"
-#include "key.h"
-#include "log.h"
-#include "mac.h"
-#include "match.h"
-#include "dispatch.h"
-#include "g11n.h"
-
-#ifdef GSSAPI
-#include "ssh-gss.h"
-#endif
-
-#define KEX_COOKIE_LEN	16
-
-char *session_lang = NULL;
-
-
-/* prototype */
-static void kex_do_hook(Kex *kex);
-static void kex_kexinit_finish(Kex *);
-static void kex_choose_conf(Kex *);
-
-/* put algorithm proposal into buffer */
-static
-void
-kex_prop2buf(Buffer *b, char *proposal[PROPOSAL_MAX])
-{
-	int i;
-
-	buffer_clear(b);
-	/*
-	 * add a dummy cookie, the cookie will be overwritten by
-	 * kex_send_kexinit(), each time a kexinit is set
-	 */
-	for (i = 0; i < KEX_COOKIE_LEN; i++)
-		buffer_put_char(b, 0);
-	for (i = 0; i < PROPOSAL_MAX; i++)
-		buffer_put_cstring(b, proposal[i]);
-	buffer_put_char(b, 0);			/* first_kex_packet_follows */
-	buffer_put_int(b, 0);			/* uint32 reserved */
-}
-
-/* parse buffer and return algorithm proposal */
-static
-char **
-kex_buf2prop(Buffer *raw, int *first_kex_follows)
-{
-	Buffer b;
-	int i;
-	char **proposal;
-
-	proposal = xmalloc(PROPOSAL_MAX * sizeof(char *));
-
-	buffer_init(&b);
-	buffer_append(&b, buffer_ptr(raw), buffer_len(raw));
-	/* skip cookie */
-	for (i = 0; i < KEX_COOKIE_LEN; i++)
-		buffer_get_char(&b);
-	/* extract kex init proposal strings */
-	for (i = 0; i < PROPOSAL_MAX; i++) {
-		proposal[i] = buffer_get_string(&b,NULL);
-		debug2("kex_parse_kexinit: %s", proposal[i]);
-	}
-	/* first kex follows / reserved */
-	i = buffer_get_char(&b);
-	if (first_kex_follows != NULL)
-		*first_kex_follows = i;
-	debug2("kex_parse_kexinit: first_kex_follows %d ", i);
-	i = buffer_get_int(&b);
-	debug2("kex_parse_kexinit: reserved %d ", i);
-	buffer_free(&b);
-	return proposal;
-}
-
-static
-void
-kex_prop_free(char **proposal)
-{
-	int i;
-
-	for (i = 0; i < PROPOSAL_MAX; i++)
-		xfree(proposal[i]);
-	xfree(proposal);
-}
-
-static void
-kex_protocol_error(int type, u_int32_t seq, void *ctxt)
-{
-	error("Hm, kex protocol error: type %d seq %u", type, seq);
-}
-
-static void
-kex_reset_dispatch(void)
-{
-#ifdef ALTPRIVSEP
-	/* unprivileged sshd has a kex packet handler that must not be reset */
-	debug3("kex_reset_dispatch -- should we dispatch_set(KEXINIT) here? %d && !%d",
-		packet_is_server(), packet_is_monitor());
-	if (packet_is_server() && !packet_is_monitor()) {
-		debug3("kex_reset_dispatch -- skipping dispatch_set(KEXINIT) in unpriv proc");
-		return;
-	}
-#endif /* ALTPRIVSEP */
-
-	dispatch_range(SSH2_MSG_TRANSPORT_MIN,
-	    SSH2_MSG_TRANSPORT_MAX, &kex_protocol_error);
-	dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
-}
-
-void
-kex_finish(Kex *kex)
-{
-	kex_reset_dispatch();
-
-	packet_start(SSH2_MSG_NEWKEYS);
-	packet_send();
-	/* packet_write_wait(); */
-	debug("SSH2_MSG_NEWKEYS sent");
-
-#ifdef ALTPRIVSEP
-	if (packet_is_monitor())
-		goto skip_newkeys;
-#endif /* ALTPRIVSEP */
-	debug("expecting SSH2_MSG_NEWKEYS");
-	packet_read_expect(SSH2_MSG_NEWKEYS);
-	packet_check_eom();
-	debug("SSH2_MSG_NEWKEYS received");
-#ifdef ALTPRIVSEP
-skip_newkeys:
-#endif /* ALTPRIVSEP */
-
-	kex->done = 1;
-	kex->initial_kex_done = 1; /* never to be cleared once set */
-	buffer_clear(&kex->peer);
-	/* buffer_clear(&kex->my); */
-	kex->flags &= ~KEX_INIT_SENT;
-	xfree(kex->name);
-	kex->name = NULL;
-}
-
-void
-kex_send_kexinit(Kex *kex)
-{
-	u_int32_t rand = 0;
-	u_char *cookie;
-	int i;
-
-	if (kex == NULL) {
-		error("kex_send_kexinit: no kex, cannot rekey");
-		return;
-	}
-	if (kex->flags & KEX_INIT_SENT) {
-		debug("KEX_INIT_SENT");
-		return;
-	}
-	kex->done = 0;
-
-	/* update my proposal -- e.g., add/remove GSS kexalgs */
-	kex_do_hook(kex);
-
-	/* generate a random cookie */
-	if (buffer_len(&kex->my) < KEX_COOKIE_LEN)
-		fatal("kex_send_kexinit: kex proposal too short");
-	cookie = buffer_ptr(&kex->my);
-	for (i = 0; i < KEX_COOKIE_LEN; i++) {
-		if (i % 4 == 0)
-			rand = arc4random();
-		cookie[i] = rand;
-		rand >>= 8;
-	}
-	packet_start(SSH2_MSG_KEXINIT);
-	packet_put_raw(buffer_ptr(&kex->my), buffer_len(&kex->my));
-	packet_send();
-	debug("SSH2_MSG_KEXINIT sent");
-	kex->flags |= KEX_INIT_SENT;
-}
-
-void
-kex_input_kexinit(int type, u_int32_t seq, void *ctxt)
-{
-	char *ptr;
-	u_int dlen;
-	int i;
-	Kex *kex = (Kex *)ctxt;
-
-	debug("SSH2_MSG_KEXINIT received");
-	if (kex == NULL)
-		fatal("kex_input_kexinit: no kex, cannot rekey");
-
-	ptr = packet_get_raw(&dlen);
-	buffer_append(&kex->peer, ptr, dlen);
-
-	/* discard packet */
-	for (i = 0; i < KEX_COOKIE_LEN; i++)
-		packet_get_char();
-	for (i = 0; i < PROPOSAL_MAX; i++)
-		xfree(packet_get_string(NULL));
-	(void) packet_get_char();
-	(void) packet_get_int();
-	packet_check_eom();
-
-	kex_kexinit_finish(kex);
-}
-
-/*
- * This is for GSS keyex, where actual KEX offer can change at rekey
- * time due to credential expiration/renewal...
- */
-static
-void
-kex_do_hook(Kex *kex)
-{
-	char    **prop;
-
-	if (kex->kex_hook == NULL)
-		return;
-
-	/* Unmarshall my proposal, let the hook modify it, remarshall it */
-	prop = kex_buf2prop(&kex->my, NULL);
-	buffer_clear(&kex->my);
-	(kex->kex_hook)(kex, prop);
-	kex_prop2buf(&kex->my, prop);
-	kex_prop_free(prop);
-}
-
-/* Initiate the key exchange by sending the SSH2_MSG_KEXINIT message. */
-void
-kex_start(Kex *kex)
-{
-	kex_send_kexinit(kex);
-	kex_reset_dispatch();
-}
-
-/*
- * Allocate a key exchange structure and populate it with a proposal we are
- * going to use. This function does not start the actual key exchange.
- */
-Kex *
-kex_setup(const char *host, char *proposal[PROPOSAL_MAX], Kex_hook_func hook)
-{
-	Kex	*kex;
-
-	kex = xmalloc(sizeof(*kex));
-	memset(kex, 0, sizeof(*kex));
-	buffer_init(&kex->peer);
-	buffer_init(&kex->my);
-
-	kex->kex_hook = hook; /* called by kex_send_kexinit() */
-
-	if (host != NULL && *host != '\0')
-		kex->serverhost = xstrdup(host);
-	else
-		kex->server = 1;
-
-	kex_prop2buf(&kex->my, proposal);
-
-	return kex;
-}
-
-static void
-kex_kexinit_finish(Kex *kex)
-{
-	if (!(kex->flags & KEX_INIT_SENT))
-		kex_send_kexinit(kex);
-
-	kex_choose_conf(kex);
-
-	if (kex->kex_type >= 0 && kex->kex_type < KEX_MAX &&
-	    kex->kex[kex->kex_type] != NULL)
-		(kex->kex[kex->kex_type])(kex);
-	else
-		fatal("Unsupported key exchange %d", kex->kex_type);
-}
-
-static void
-choose_lang(char **lang, char *client, char *server)
-{
-	if (datafellows & SSH_BUG_LOCALES_NOT_LANGTAGS)
-		*lang = match_list(client, server, NULL);
-	else
-		*lang = g11n_srvr_locale_negotiate(client, NULL);
-}
-
-/*
- * Make the message clear enough so that if this happens the user can figure out
- * the workaround of changing the Ciphers option.
- */
-#define	CLIENT_ERR_MSG							       \
-  "Client and server could not agree on a common cipher:\n"		       \
-  "  client: %s\n"							       \
-  "  server: %s\n"							       \
-  "\n"									       \
-  "The client cipher list can be controlled using the \"Ciphers\" option, \n"  \
-  "see ssh_config(4) for more information. The \"-o Ciphers=<cipher-list>\"\n" \
-  "option may be used to temporarily override the ciphers the client\n"	       \
-  "offers."
-
-/*
- * The server side message goes to syslogd and we do not want to send multiline
- * messages there. What's more, the server side notification may be shorter
- * since we expect that an administrator will deal with that, not the user.
- */
-#define	SERVER_ERR_MSG							       \
-  "Client and server could not agree on a common cipher: client \"%s\", "      \
-  "server \"%s\". The server cipher list can be controlled using the "	       \
-  "\"Ciphers\" option, see sshd_config(4) for more information."
-
-static void
-choose_enc(int is_server, Enc *enc, char *client, char *server)
-{
-	char *name = match_list(client, server, NULL);
-
-	if (name == NULL) {
-		if (is_server == 1)
-			fatal(SERVER_ERR_MSG, client, server);
-		else
-			fatal(CLIENT_ERR_MSG, client, server);
-	}
-
-	if ((enc->cipher = cipher_by_name(name)) == NULL)
-		fatal("matching cipher is not supported: %s", name);
-
-	enc->name = name;
-	enc->enabled = 0;
-	enc->iv = NULL;
-	enc->key = NULL;
-	enc->key_len = cipher_keylen(enc->cipher);
-	enc->block_size = cipher_blocksize(enc->cipher);
-}
-
-static void
-choose_mac(Mac *mac, char *client, char *server)
-{
-	char *name = match_list(client, server, NULL);
-	if (name == NULL)
-		fatal("no matching mac found: client %s server %s",
-		    client, server);
-	if (mac_setup(mac, name) < 0)
-		fatal("unsupported mac %s", name);
-	/* truncate the key */
-	if (datafellows & SSH_BUG_HMAC)
-		mac->key_len = 16;
-	mac->name = name;
-	mac->key = NULL;
-	mac->enabled = 0;
-}
-
-static void
-choose_comp(Comp *comp, char *client, char *server)
-{
-	char *name = match_list(client, server, NULL);
-	if (name == NULL)
-		fatal("no matching comp found: client %s server %s", client, server);
-	if (strcmp(name, "zlib") == 0) {
-		comp->type = 1;
-	} else if (strcmp(name, "none") == 0) {
-		comp->type = 0;
-	} else {
-		fatal("unsupported comp %s", name);
-	}
-	comp->name = name;
-}
-
-static void
-choose_kex(Kex *k, char *client, char *server)
-{
-	k->name = match_list(client, server, NULL);
-	if (k->name == NULL)
-		fatal("no common kex alg: client '%s', server '%s'", client,
-		    server);
-	/* XXX Finish 3.6/7 merge of kex stuff -- choose_kex() done */
-	if (strcmp(k->name, KEX_DH1) == 0) {
-		k->kex_type = KEX_DH_GRP1_SHA1;
-	} else if (strcmp(k->name, KEX_DHGEX) == 0) {
-		k->kex_type = KEX_DH_GEX_SHA1;
-#ifdef GSSAPI
-	} else if (strncmp(k->name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) == 0) {
-		k->kex_type = KEX_GSS_GRP1_SHA1;
-#endif
-	} else
-		fatal("bad kex alg %s", k->name);
-}
-
-static void
-choose_hostkeyalg(Kex *k, char *client, char *server)
-{
-	char *hostkeyalg = match_list(client, server, NULL);
-	if (hostkeyalg == NULL)
-		fatal("no hostkey alg");
-	k->hostkey_type = key_type_from_name(hostkeyalg);
-	if (k->hostkey_type == KEY_UNSPEC)
-		fatal("bad hostkey alg '%s'", hostkeyalg);
-	xfree(hostkeyalg);
-}
-
-static int
-proposals_match(char *my[PROPOSAL_MAX], char *peer[PROPOSAL_MAX])
-{
-	static int check[] = {
-		PROPOSAL_KEX_ALGS, PROPOSAL_SERVER_HOST_KEY_ALGS, -1
-	};
-	int *idx;
-	char *p;
-
-	for (idx = &check[0]; *idx != -1; idx++) {
-		if ((p = strchr(my[*idx], ',')) != NULL)
-			*p = '\0';
-		if ((p = strchr(peer[*idx], ',')) != NULL)
-			*p = '\0';
-		if (strcmp(my[*idx], peer[*idx]) != 0) {
-			debug2("proposal mismatch: my %s peer %s",
-			    my[*idx], peer[*idx]);
-			return (0);
-		}
-	}
-	debug2("proposals match");
-	return (1);
-}
-
-static void
-kex_choose_conf(Kex *kex)
-{
-	Newkeys *newkeys;
-	char **my, **peer;
-	char **cprop, **sprop;
-	char *p_langs_c2s, *p_langs_s2c; /* peer's langs */
-	char *plangs = NULL;		 /* peer's langs*/
-	char *mlangs = NULL;		 /* my langs */
-	int nenc, nmac, ncomp;
-	int mode;
-	int ctos;				/* direction: if true client-to-server */
-	int need;
-	int first_kex_follows, type;
-
-	my   = kex_buf2prop(&kex->my, NULL);
-	peer = kex_buf2prop(&kex->peer, &first_kex_follows);
-
-	if (kex->server) {
-		cprop=peer;
-		sprop=my;
-	} else {
-		cprop=my;
-		sprop=peer;
-	}
-
-	/* Algorithm Negotiation */
-	for (mode = 0; mode < MODE_MAX; mode++) {
-		newkeys = xmalloc(sizeof(*newkeys));
-		memset(newkeys, 0, sizeof(*newkeys));
-		kex->newkeys[mode] = newkeys;
-		ctos = (!kex->server && mode == MODE_OUT) || (kex->server && mode == MODE_IN);
-		nenc  = ctos ? PROPOSAL_ENC_ALGS_CTOS  : PROPOSAL_ENC_ALGS_STOC;
-		nmac  = ctos ? PROPOSAL_MAC_ALGS_CTOS  : PROPOSAL_MAC_ALGS_STOC;
-		ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC;
-		choose_enc(kex->server, &newkeys->enc,  cprop[nenc],  sprop[nenc]);
-		choose_mac(&newkeys->mac,  cprop[nmac],  sprop[nmac]);
-		choose_comp(&newkeys->comp, cprop[ncomp], sprop[ncomp]);
-		debug("kex: %s %s %s %s",
-		    ctos ? "client->server" : "server->client",
-		    newkeys->enc.name,
-		    newkeys->mac.name,
-		    newkeys->comp.name);
-	}
-	choose_kex(kex, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]);
-	choose_hostkeyalg(kex, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
-	    sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]);
-	need = 0;
-	for (mode = 0; mode < MODE_MAX; mode++) {
-		newkeys = kex->newkeys[mode];
-		if (need < newkeys->enc.key_len)
-			need = newkeys->enc.key_len;
-		if (need < newkeys->enc.block_size)
-			need = newkeys->enc.block_size;
-		if (need < newkeys->mac.key_len)
-			need = newkeys->mac.key_len;
-	}
-	/* XXX need runden? */
-	kex->we_need = need;
-
-	/* ignore the next message if the proposals do not match */
-	if (first_kex_follows && !proposals_match(my, peer) &&
-	    !(datafellows & SSH_BUG_FIRSTKEX)) {
-		type = packet_read();
-		debug2("skipping next packet (type %u)", type);
-	}
-
-	/* Language/locale negotiation -- not worth doing on re-key */
-
-	if (!kex->initial_kex_done) {
-		p_langs_c2s = peer[PROPOSAL_LANG_CTOS];
-		p_langs_s2c = peer[PROPOSAL_LANG_STOC];
-		debug("Peer sent proposed langtags, ctos: %s", p_langs_c2s);
-		debug("Peer sent proposed langtags, stoc: %s", p_langs_s2c);
-		plangs = NULL;
-
-		/* We propose the same langs for each protocol direction */
-		mlangs = my[PROPOSAL_LANG_STOC];
-		debug("We proposed langtags, ctos: %s", my[PROPOSAL_LANG_CTOS]);
-		debug("We proposed langtags, stoc: %s", mlangs);
-		
-		/*
-		 * Why oh why did they bother with negotiating langs for
-		 * each protocol direction?!
-		 *
-		 * The semantics of this are vaguely specified, but one can
-		 * imagine using one language (locale) for the whole session and
-		 * a different one for message localization (e.g., 'en_US.UTF-8'
-		 * overall and 'fr' for messages).  Weird?  Maybe.  But lang
-		 * tags don't include codeset info, like locales do...
-		 *
-		 * So, server-side we want:
-		 *  - setlocale(LC_ALL, c2s_locale);
-		 *  and
-		 *  - setlocale(LC_MESSAGES, s2c_locale);
-		 *
-		 * Client-side we don't really care.  But we could do:
-		 *
-		 *  - when very verbose, tell the use what lang the server's
-		 *    messages are in, if left out in the protocol
-		 *  - when sending messages to the server, and if applicable, we
-		 *    can localize them according to the language negotiated for
-		 *    that direction.
-		 *
-		 * But for now we do nothing on the client side.
-		 */
-		if ((p_langs_c2s && *p_langs_c2s) && !(p_langs_s2c && *p_langs_s2c))
-			plangs = p_langs_c2s;
-		else if ((p_langs_s2c && *p_langs_s2c) && !(p_langs_c2s && *p_langs_c2s))
-			plangs = p_langs_s2c;
-		else
-			plangs = p_langs_c2s;
-
-		if (kex->server) {
-			if (plangs && mlangs && *plangs && *mlangs) {
-				char *locale;
-
-				g11n_test_langtag(plangs, 1);
-
-				choose_lang(&locale, plangs, mlangs);
-				if (locale) {
-					g11n_setlocale(LC_ALL, locale);
-					debug("Negotiated main locale: %s", locale);
-					packet_send_debug("Negotiated main locale: %s", locale);
-					xfree(locale);
-				}
-				if (plangs != p_langs_s2c &&
-				    p_langs_s2c && *p_langs_s2c) {
-					choose_lang(&locale, p_langs_s2c, mlangs);
-					if (locale) {
-						g11n_setlocale(LC_MESSAGES, locale);
-						debug("Negotiated messages locale: %s", locale);
-						packet_send_debug("Negotiated "
-						    "messages locale: %s", locale);
-						xfree(locale);
-					}
-				}
-			}
-		}
-		else {
-			if (plangs && mlangs && *plangs && *mlangs &&
-			    !(datafellows & SSH_BUG_LOCALES_NOT_LANGTAGS)) {
-				char *lang;
-				lang = g11n_clnt_langtag_negotiate(mlangs, plangs);
-				if (lang) {
-					session_lang = lang;
-					debug("Negotiated lang: %s", lang);
-					g11n_test_langtag(lang, 0);
-				}
-			}
-		}
-	}
-
-	kex_prop_free(my);
-	kex_prop_free(peer);
-}
-
-static u_char *
-derive_key(Kex *kex, int id, int need, u_char *hash, BIGNUM *shared_secret)
-{
-	Buffer b;
-	const EVP_MD *evp_md = EVP_sha1();
-	EVP_MD_CTX md;
-	char c = id;
-	int have;
-	int mdsz = EVP_MD_size(evp_md);
-	u_char *digest = xmalloc(roundup(need, mdsz));
-
-	buffer_init(&b);
-	buffer_put_bignum2(&b, shared_secret);
-
-	/* K1 = HASH(K || H || "A" || session_id) */
-	EVP_DigestInit(&md, evp_md);
-	if (!(datafellows & SSH_BUG_DERIVEKEY))
-		EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
-	EVP_DigestUpdate(&md, hash, mdsz);
-	EVP_DigestUpdate(&md, &c, 1);
-	EVP_DigestUpdate(&md, kex->session_id, kex->session_id_len);
-	EVP_DigestFinal(&md, digest, NULL);
-
-	/*
-	 * expand key:
-	 * Kn = HASH(K || H || K1 || K2 || ... || Kn-1)
-	 * Key = K1 || K2 || ... || Kn
-	 */
-	for (have = mdsz; need > have; have += mdsz) {
-		EVP_DigestInit(&md, evp_md);
-		if (!(datafellows & SSH_BUG_DERIVEKEY))
-			EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
-		EVP_DigestUpdate(&md, hash, mdsz);
-		EVP_DigestUpdate(&md, digest, have);
-		EVP_DigestFinal(&md, digest + have, NULL);
-	}
-	buffer_free(&b);
-#ifdef DEBUG_KEX
-	fprintf(stderr, "key '%c'== ", c);
-	dump_digest("key", digest, need);
-#endif
-	return digest;
-}
-
-Newkeys *current_keys[MODE_MAX];
-
-#define NKEYS	6
-void
-kex_derive_keys(Kex *kex, u_char *hash, BIGNUM *shared_secret)
-{
-	u_char *keys[NKEYS];
-	int i, mode, ctos;
-
-	for (i = 0; i < NKEYS; i++)
-		keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, shared_secret);
-
-	debug2("kex_derive_keys");
-	for (mode = 0; mode < MODE_MAX; mode++) {
-		current_keys[mode] = kex->newkeys[mode];
-		kex->newkeys[mode] = NULL;
-		ctos = (!kex->server && mode == MODE_OUT) || (kex->server && mode == MODE_IN);
-		current_keys[mode]->enc.iv  = keys[ctos ? 0 : 1];
-		current_keys[mode]->enc.key = keys[ctos ? 2 : 3];
-		current_keys[mode]->mac.key = keys[ctos ? 4 : 5];
-	}
-}
-
-Newkeys *
-kex_get_newkeys(int mode)
-{
-	Newkeys *ret;
-
-	ret = current_keys[mode];
-	current_keys[mode] = NULL;
-	return ret;
-}
-
-#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
-void
-dump_digest(char *msg, u_char *digest, int len)
-{
-	int i;
-
-	fprintf(stderr, "%s\n", msg);
-	for (i = 0; i< len; i++) {
-		fprintf(stderr, "%02x", digest[i]);
-		if (i%32 == 31)
-			fprintf(stderr, "\n");
-		else if (i%8 == 7)
-			fprintf(stderr, " ");
-	}
-	fprintf(stderr, "\n");
-}
-#endif