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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller4af51302000-04-16 11:18:38 +10005 *
Damien Millere4340be2000-09-16 13:29:08 +11006 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
Damien Miller4af51302000-04-16 11:18:38 +100011 *
Damien Millere4340be2000-09-16 13:29:08 +110012 *
13 * Copyright (c) 1999 Niels Provos. All rights reserved.
Ben Lindstrom44697232001-07-04 03:32:30 +000014 * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110015 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110035 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036
37#include "includes.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100038
Damien Miller78928792000-04-12 20:17:38 +100039#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000040#include "log.h"
41#include "cipher.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include <openssl/md5.h>
Damien Miller21cf4e02002-02-19 15:26:42 +110044
Darren Tuckerf0bd3522005-06-17 21:15:20 +100045/* compatibility with old or broken OpenSSL versions */
46#include "openbsd-compat/openssl-compat.h"
47
Damien Miller3a3261f2003-05-15 13:37:19 +100048extern const EVP_CIPHER *evp_ssh1_bf(void);
49extern const EVP_CIPHER *evp_ssh1_3des(void);
50extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
Damien Millerf5399c22003-05-18 20:53:59 +100051extern const EVP_CIPHER *evp_aes_128_ctr(void);
52extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053
Damien Miller963f6b22002-02-19 15:21:23 +110054struct Cipher {
55 char *name;
56 int number; /* for ssh1 only */
57 u_int block_size;
58 u_int key_len;
Damien Miller3710f272005-05-26 12:19:17 +100059 u_int discard_len;
Ben Lindstrom6a246412002-06-06 19:48:16 +000060 const EVP_CIPHER *(*evptype)(void);
Damien Miller21cf4e02002-02-19 15:26:42 +110061} ciphers[] = {
Damien Miller3710f272005-05-26 12:19:17 +100062 { "none", SSH_CIPHER_NONE, 8, 0, 0, EVP_enc_null },
63 { "des", SSH_CIPHER_DES, 8, 8, 0, EVP_des_cbc },
64 { "3des", SSH_CIPHER_3DES, 8, 16, 0, evp_ssh1_3des },
65 { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, evp_ssh1_bf },
Damien Miller963f6b22002-02-19 15:21:23 +110066
Damien Miller3710f272005-05-26 12:19:17 +100067 { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, EVP_des_ede3_cbc },
68 { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_bf_cbc },
69 { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_cast5_cbc },
70 { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, EVP_rc4 },
71 { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, EVP_rc4 },
72 { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, EVP_rc4 },
Damien Miller3710f272005-05-26 12:19:17 +100073 { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, EVP_aes_128_cbc },
74 { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, EVP_aes_192_cbc },
75 { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
Ben Lindstromf088f432002-06-06 20:50:07 +000076 { "rijndael-cbc@lysator.liu.se",
Damien Miller3710f272005-05-26 12:19:17 +100077 SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
Damien Miller3710f272005-05-26 12:19:17 +100078 { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, evp_aes_128_ctr },
79 { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, evp_aes_128_ctr },
80 { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, evp_aes_128_ctr },
Darren Tuckera55ec772005-06-09 21:45:10 +100081#ifdef USE_CIPHER_ACSS
Damien Miller3710f272005-05-26 12:19:17 +100082 { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, EVP_acss },
Damien Miller4f0fe682004-01-27 21:19:21 +110083#endif
Damien Miller3710f272005-05-26 12:19:17 +100084 { NULL, SSH_CIPHER_INVALID, 0, 0, 0, NULL }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085};
86
Damien Miller874d77b2000-10-14 16:23:11 +110087/*--*/
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Ben Lindstrom6328ab32002-03-22 02:54:23 +000089u_int
Damien Millerf58b58c2003-11-17 21:18:23 +110090cipher_blocksize(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +110091{
92 return (c->block_size);
93}
Ben Lindstrom836f0e92002-06-23 21:21:30 +000094
Ben Lindstrom6328ab32002-03-22 02:54:23 +000095u_int
Damien Millerf58b58c2003-11-17 21:18:23 +110096cipher_keylen(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +110097{
98 return (c->key_len);
99}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000100
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000101u_int
Damien Millerf58b58c2003-11-17 21:18:23 +1100102cipher_get_number(const Cipher *c)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000103{
104 return (c->number);
105}
Damien Miller963f6b22002-02-19 15:21:23 +1100106
Ben Lindstrom46c16222000-12-22 01:43:59 +0000107u_int
Damien Miller874d77b2000-10-14 16:23:11 +1100108cipher_mask_ssh1(int client)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000110 u_int mask = 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100111 mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
Damien Miller95def091999-11-25 00:26:21 +1100112 mask |= 1 << SSH_CIPHER_BLOWFISH;
Damien Miller874d77b2000-10-14 16:23:11 +1100113 if (client) {
114 mask |= 1 << SSH_CIPHER_DES;
115 }
Damien Miller1383bd82000-04-06 12:32:37 +1000116 return mask;
117}
Damien Miller874d77b2000-10-14 16:23:11 +1100118
119Cipher *
120cipher_by_name(const char *name)
Damien Miller1383bd82000-04-06 12:32:37 +1000121{
Damien Miller874d77b2000-10-14 16:23:11 +1100122 Cipher *c;
123 for (c = ciphers; c->name != NULL; c++)
Darren Tucker660db782005-01-24 21:57:11 +1100124 if (strcmp(c->name, name) == 0)
Damien Miller874d77b2000-10-14 16:23:11 +1100125 return c;
126 return NULL;
Damien Miller1383bd82000-04-06 12:32:37 +1000127}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128
Damien Miller874d77b2000-10-14 16:23:11 +1100129Cipher *
130cipher_by_number(int id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131{
Damien Miller874d77b2000-10-14 16:23:11 +1100132 Cipher *c;
133 for (c = ciphers; c->name != NULL; c++)
134 if (c->number == id)
135 return c;
136 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137}
138
Damien Miller78928792000-04-12 20:17:38 +1000139#define CIPHER_SEP ","
140int
141ciphers_valid(const char *names)
142{
Damien Miller874d77b2000-10-14 16:23:11 +1100143 Cipher *c;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000144 char *cipher_list, *cp;
Damien Miller78928792000-04-12 20:17:38 +1000145 char *p;
Damien Miller78928792000-04-12 20:17:38 +1000146
Damien Millerb1715dc2000-05-30 13:44:51 +1000147 if (names == NULL || strcmp(names, "") == 0)
Damien Miller78928792000-04-12 20:17:38 +1000148 return 0;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000149 cipher_list = cp = xstrdup(names);
Damien Miller874d77b2000-10-14 16:23:11 +1100150 for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100151 (p = strsep(&cp, CIPHER_SEP))) {
Damien Miller874d77b2000-10-14 16:23:11 +1100152 c = cipher_by_name(p);
153 if (c == NULL || c->number != SSH_CIPHER_SSH2) {
154 debug("bad cipher %s [%s]", p, names);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000155 xfree(cipher_list);
Damien Miller78928792000-04-12 20:17:38 +1000156 return 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100157 } else {
Damien Miller50a41ed2000-10-16 12:14:42 +1100158 debug3("cipher ok: %s [%s]", p, names);
Damien Miller78928792000-04-12 20:17:38 +1000159 }
160 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100161 debug3("ciphers ok: [%s]", names);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000162 xfree(cipher_list);
Damien Miller78928792000-04-12 20:17:38 +1000163 return 1;
164}
165
Damien Miller5428f641999-11-25 11:54:57 +1100166/*
167 * Parses the name of the cipher. Returns the number of the corresponding
168 * cipher, or -1 on error.
169 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000170
171int
172cipher_number(const char *name)
173{
Damien Miller874d77b2000-10-14 16:23:11 +1100174 Cipher *c;
Damien Millerb1715dc2000-05-30 13:44:51 +1000175 if (name == NULL)
176 return -1;
Darren Tucker660db782005-01-24 21:57:11 +1100177 for (c = ciphers; c->name != NULL; c++)
178 if (strcasecmp(c->name, name) == 0)
179 return c->number;
180 return -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100181}
182
183char *
184cipher_name(int id)
185{
186 Cipher *c = cipher_by_number(id);
187 return (c==NULL) ? "<unknown>" : c->name;
188}
189
190void
Damien Miller21cf4e02002-02-19 15:26:42 +1100191cipher_init(CipherContext *cc, Cipher *cipher,
192 const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000193 int do_encrypt)
Damien Miller874d77b2000-10-14 16:23:11 +1100194{
Damien Miller21cf4e02002-02-19 15:26:42 +1100195 static int dowarn = 1;
Damien Millerc7375ac2002-03-11 10:51:17 +1100196#ifdef SSH_OLD_EVP
197 EVP_CIPHER *type;
198#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100199 const EVP_CIPHER *type;
200 int klen;
Darren Tuckera55ec772005-06-09 21:45:10 +1000201#endif
Damien Miller3710f272005-05-26 12:19:17 +1000202 u_char *junk, *discard;
Damien Miller21cf4e02002-02-19 15:26:42 +1100203
204 if (cipher->number == SSH_CIPHER_DES) {
205 if (dowarn) {
206 error("Warning: use of DES is strongly discouraged "
207 "due to cryptographic weaknesses");
208 dowarn = 0;
209 }
210 if (keylen > 8)
211 keylen = 8;
212 }
213 cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
214
Damien Miller874d77b2000-10-14 16:23:11 +1100215 if (keylen < cipher->key_len)
216 fatal("cipher_init: key length %d is insufficient for %s.",
217 keylen, cipher->name);
218 if (iv != NULL && ivlen < cipher->block_size)
219 fatal("cipher_init: iv length %d is insufficient for %s.",
220 ivlen, cipher->name);
221 cc->cipher = cipher;
Damien Miller21cf4e02002-02-19 15:26:42 +1100222
223 type = (*cipher->evptype)();
224
225 EVP_CIPHER_CTX_init(&cc->evp);
Damien Millerc7375ac2002-03-11 10:51:17 +1100226#ifdef SSH_OLD_EVP
227 if (type->key_len > 0 && type->key_len != keylen) {
228 debug("cipher_init: set keylen (%d -> %d)",
229 type->key_len, keylen);
230 type->key_len = keylen;
231 }
232 EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
Darren Tuckere5a604f2004-06-23 12:28:31 +1000233 (do_encrypt == CIPHER_ENCRYPT));
Damien Millerc7375ac2002-03-11 10:51:17 +1100234#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100235 if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000236 (do_encrypt == CIPHER_ENCRYPT)) == 0)
Damien Miller21cf4e02002-02-19 15:26:42 +1100237 fatal("cipher_init: EVP_CipherInit failed for %s",
238 cipher->name);
239 klen = EVP_CIPHER_CTX_key_length(&cc->evp);
Damien Millereccb9de2005-06-17 12:59:34 +1000240 if (klen > 0 && keylen != (u_int)klen) {
Ben Lindstrom064496f2002-12-23 02:04:22 +0000241 debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
Damien Miller21cf4e02002-02-19 15:26:42 +1100242 if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
243 fatal("cipher_init: set keylen failed (%d -> %d)",
244 klen, keylen);
245 }
246 if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
247 fatal("cipher_init: EVP_CipherInit: set key failed for %s",
248 cipher->name);
Damien Millerc7375ac2002-03-11 10:51:17 +1100249#endif
Damien Miller3710f272005-05-26 12:19:17 +1000250
Damien Miller46d38de2005-07-17 17:02:09 +1000251 if (cipher->discard_len > 0) {
Damien Miller3710f272005-05-26 12:19:17 +1000252 junk = xmalloc(cipher->discard_len);
253 discard = xmalloc(cipher->discard_len);
254 if (EVP_Cipher(&cc->evp, discard, junk,
255 cipher->discard_len) == 0)
256 fatal("evp_crypt: EVP_Cipher failed during discard");
257 memset(discard, 0, cipher->discard_len);
258 xfree(junk);
259 xfree(discard);
260 }
Damien Miller874d77b2000-10-14 16:23:11 +1100261}
262
263void
Damien Miller963f6b22002-02-19 15:21:23 +1100264cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
Damien Miller874d77b2000-10-14 16:23:11 +1100265{
266 if (len % cc->cipher->block_size)
267 fatal("cipher_encrypt: bad plaintext length %d", len);
Damien Miller21cf4e02002-02-19 15:26:42 +1100268 if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
269 fatal("evp_crypt: EVP_Cipher failed");
Damien Miller874d77b2000-10-14 16:23:11 +1100270}
271
272void
Damien Miller963f6b22002-02-19 15:21:23 +1100273cipher_cleanup(CipherContext *cc)
Damien Miller874d77b2000-10-14 16:23:11 +1100274{
Damien Miller21cf4e02002-02-19 15:26:42 +1100275 if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
276 error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000277}
278
Damien Miller5428f641999-11-25 11:54:57 +1100279/*
280 * Selects the cipher, and keys if by computing the MD5 checksum of the
281 * passphrase and using the resulting 16 bytes as the key.
282 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000283
Damien Miller4af51302000-04-16 11:18:38 +1000284void
Damien Miller874d77b2000-10-14 16:23:11 +1100285cipher_set_key_string(CipherContext *cc, Cipher *cipher,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000286 const char *passphrase, int do_encrypt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000287{
Damien Miller95def091999-11-25 00:26:21 +1100288 MD5_CTX md;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000289 u_char digest[16];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000290
Damien Miller95def091999-11-25 00:26:21 +1100291 MD5_Init(&md);
Damien Miller874d77b2000-10-14 16:23:11 +1100292 MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
Damien Miller95def091999-11-25 00:26:21 +1100293 MD5_Final(digest, &md);
294
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000295 cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
Damien Miller95def091999-11-25 00:26:21 +1100296
297 memset(digest, 0, sizeof(digest));
298 memset(&md, 0, sizeof(md));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000299}
Damien Miller21cf4e02002-02-19 15:26:42 +1100300
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000301/*
Ben Lindstrom212faca2002-03-22 01:39:44 +0000302 * Exports an IV from the CipherContext required to export the key
303 * state back from the unprivileged child to the privileged parent
304 * process.
305 */
306
307int
Damien Millerf58b58c2003-11-17 21:18:23 +1100308cipher_get_keyiv_len(const CipherContext *cc)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000309{
310 Cipher *c = cc->cipher;
311 int ivlen;
312
313 if (c->number == SSH_CIPHER_3DES)
314 ivlen = 24;
315 else
316 ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
317 return (ivlen);
318}
319
320void
321cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
322{
323 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000324 int evplen;
325
326 switch (c->number) {
327 case SSH_CIPHER_SSH2:
328 case SSH_CIPHER_DES:
329 case SSH_CIPHER_BLOWFISH:
330 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
Damien Millereccb9de2005-06-17 12:59:34 +1000331 if (evplen <= 0)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000332 return;
Damien Millereccb9de2005-06-17 12:59:34 +1000333 if ((u_int)evplen != len)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000334 fatal("%s: wrong iv length %d != %d", __func__,
Ben Lindstrom212faca2002-03-22 01:39:44 +0000335 evplen, len);
Darren Tucker129d0bb2005-12-19 17:40:40 +1100336#ifdef USE_BUILTIN_RIJNDAEL
Damien Millera201bb32003-05-14 13:41:23 +1000337 if (c->evptype == evp_rijndael)
338 ssh_rijndael_iv(&cc->evp, 0, iv, len);
339 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000340#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000341 if (c->evptype == evp_aes_128_ctr)
342 ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
343 else
Damien Millera201bb32003-05-14 13:41:23 +1000344 memcpy(iv, cc->evp.iv, len);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000345 break;
Damien Millera201bb32003-05-14 13:41:23 +1000346 case SSH_CIPHER_3DES:
347 ssh1_3des_iv(&cc->evp, 0, iv, 24);
348 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000349 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000350 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000351 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000352}
353
354void
355cipher_set_keyiv(CipherContext *cc, u_char *iv)
356{
357 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000358 int evplen = 0;
359
360 switch (c->number) {
361 case SSH_CIPHER_SSH2:
362 case SSH_CIPHER_DES:
363 case SSH_CIPHER_BLOWFISH:
364 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
365 if (evplen == 0)
366 return;
Darren Tucker129d0bb2005-12-19 17:40:40 +1100367#ifdef USE_BUILTIN_RIJNDAEL
Damien Millera201bb32003-05-14 13:41:23 +1000368 if (c->evptype == evp_rijndael)
369 ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
370 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000371#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000372 if (c->evptype == evp_aes_128_ctr)
373 ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
374 else
Damien Millera201bb32003-05-14 13:41:23 +1000375 memcpy(cc->evp.iv, iv, evplen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000376 break;
Damien Millera201bb32003-05-14 13:41:23 +1000377 case SSH_CIPHER_3DES:
378 ssh1_3des_iv(&cc->evp, 1, iv, 24);
379 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000380 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000381 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000382 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000383}
384
385#if OPENSSL_VERSION_NUMBER < 0x00907000L
386#define EVP_X_STATE(evp) &(evp).c
387#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
388#else
389#define EVP_X_STATE(evp) (evp).cipher_data
390#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
391#endif
392
393int
Damien Millerf58b58c2003-11-17 21:18:23 +1100394cipher_get_keycontext(const CipherContext *cc, u_char *dat)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000395{
396 Cipher *c = cc->cipher;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000397 int plen = 0;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000398
Damien Miller4f0fe682004-01-27 21:19:21 +1100399 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000400 plen = EVP_X_STATE_LEN(cc->evp);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000401 if (dat == NULL)
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000402 return (plen);
403 memcpy(dat, EVP_X_STATE(cc->evp), plen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000404 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000405 return (plen);
406}
407
408void
409cipher_set_keycontext(CipherContext *cc, u_char *dat)
410{
411 Cipher *c = cc->cipher;
412 int plen;
413
Damien Miller4f0fe682004-01-27 21:19:21 +1100414 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom212faca2002-03-22 01:39:44 +0000415 plen = EVP_X_STATE_LEN(cc->evp);
416 memcpy(EVP_X_STATE(cc->evp), dat, plen);
417 }
Damien Miller21cf4e02002-02-19 15:26:42 +1100418}