blob: 0dddf270af90186fca423bd3f953afe7ba0b4f3c [file] [log] [blame]
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 Miller46d38de2005-07-17 17:02:09 +100038RCSID("$OpenBSD: cipher.c,v 1.77 2005/07/16 01:35:24 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100039
Damien Miller78928792000-04-12 20:17:38 +100040#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000041#include "log.h"
42#include "cipher.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
44#include <openssl/md5.h>
Damien Miller21cf4e02002-02-19 15:26:42 +110045
Darren Tuckerf0bd3522005-06-17 21:15:20 +100046/* compatibility with old or broken OpenSSL versions */
47#include "openbsd-compat/openssl-compat.h"
48
Damien Miller3a3261f2003-05-15 13:37:19 +100049extern const EVP_CIPHER *evp_ssh1_bf(void);
50extern const EVP_CIPHER *evp_ssh1_3des(void);
51extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
Damien Millerf5399c22003-05-18 20:53:59 +100052extern const EVP_CIPHER *evp_aes_128_ctr(void);
53extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100054
Damien Miller963f6b22002-02-19 15:21:23 +110055struct Cipher {
56 char *name;
57 int number; /* for ssh1 only */
58 u_int block_size;
59 u_int key_len;
Damien Miller3710f272005-05-26 12:19:17 +100060 u_int discard_len;
Ben Lindstrom6a246412002-06-06 19:48:16 +000061 const EVP_CIPHER *(*evptype)(void);
Damien Miller21cf4e02002-02-19 15:26:42 +110062} ciphers[] = {
Damien Miller3710f272005-05-26 12:19:17 +100063 { "none", SSH_CIPHER_NONE, 8, 0, 0, EVP_enc_null },
64 { "des", SSH_CIPHER_DES, 8, 8, 0, EVP_des_cbc },
65 { "3des", SSH_CIPHER_3DES, 8, 16, 0, evp_ssh1_3des },
66 { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, evp_ssh1_bf },
Damien Miller963f6b22002-02-19 15:21:23 +110067
Damien Miller3710f272005-05-26 12:19:17 +100068 { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, EVP_des_ede3_cbc },
69 { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_bf_cbc },
70 { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_cast5_cbc },
71 { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, EVP_rc4 },
72 { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, EVP_rc4 },
73 { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, EVP_rc4 },
Damien Miller3710f272005-05-26 12:19:17 +100074 { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, EVP_aes_128_cbc },
75 { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, EVP_aes_192_cbc },
76 { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
Ben Lindstromf088f432002-06-06 20:50:07 +000077 { "rijndael-cbc@lysator.liu.se",
Damien Miller3710f272005-05-26 12:19:17 +100078 SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
Damien Miller3710f272005-05-26 12:19:17 +100079 { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, evp_aes_128_ctr },
80 { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, evp_aes_128_ctr },
81 { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, evp_aes_128_ctr },
Darren Tuckera55ec772005-06-09 21:45:10 +100082#ifdef USE_CIPHER_ACSS
Damien Miller3710f272005-05-26 12:19:17 +100083 { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, EVP_acss },
Damien Miller4f0fe682004-01-27 21:19:21 +110084#endif
Damien Miller3710f272005-05-26 12:19:17 +100085 { NULL, SSH_CIPHER_INVALID, 0, 0, 0, NULL }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086};
87
Damien Miller874d77b2000-10-14 16:23:11 +110088/*--*/
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089
Ben Lindstrom6328ab32002-03-22 02:54:23 +000090u_int
Damien Millerf58b58c2003-11-17 21:18:23 +110091cipher_blocksize(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +110092{
93 return (c->block_size);
94}
Ben Lindstrom836f0e92002-06-23 21:21:30 +000095
Ben Lindstrom6328ab32002-03-22 02:54:23 +000096u_int
Damien Millerf58b58c2003-11-17 21:18:23 +110097cipher_keylen(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +110098{
99 return (c->key_len);
100}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000101
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000102u_int
Damien Millerf58b58c2003-11-17 21:18:23 +1100103cipher_get_number(const Cipher *c)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000104{
105 return (c->number);
106}
Damien Miller963f6b22002-02-19 15:21:23 +1100107
Ben Lindstrom46c16222000-12-22 01:43:59 +0000108u_int
Damien Miller874d77b2000-10-14 16:23:11 +1100109cipher_mask_ssh1(int client)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000111 u_int mask = 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100112 mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
Damien Miller95def091999-11-25 00:26:21 +1100113 mask |= 1 << SSH_CIPHER_BLOWFISH;
Damien Miller874d77b2000-10-14 16:23:11 +1100114 if (client) {
115 mask |= 1 << SSH_CIPHER_DES;
116 }
Damien Miller1383bd82000-04-06 12:32:37 +1000117 return mask;
118}
Damien Miller874d77b2000-10-14 16:23:11 +1100119
120Cipher *
121cipher_by_name(const char *name)
Damien Miller1383bd82000-04-06 12:32:37 +1000122{
Damien Miller874d77b2000-10-14 16:23:11 +1100123 Cipher *c;
124 for (c = ciphers; c->name != NULL; c++)
Darren Tucker660db782005-01-24 21:57:11 +1100125 if (strcmp(c->name, name) == 0)
Damien Miller874d77b2000-10-14 16:23:11 +1100126 return c;
127 return NULL;
Damien Miller1383bd82000-04-06 12:32:37 +1000128}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129
Damien Miller874d77b2000-10-14 16:23:11 +1100130Cipher *
131cipher_by_number(int id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132{
Damien Miller874d77b2000-10-14 16:23:11 +1100133 Cipher *c;
134 for (c = ciphers; c->name != NULL; c++)
135 if (c->number == id)
136 return c;
137 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138}
139
Damien Miller78928792000-04-12 20:17:38 +1000140#define CIPHER_SEP ","
141int
142ciphers_valid(const char *names)
143{
Damien Miller874d77b2000-10-14 16:23:11 +1100144 Cipher *c;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000145 char *cipher_list, *cp;
Damien Miller78928792000-04-12 20:17:38 +1000146 char *p;
Damien Miller78928792000-04-12 20:17:38 +1000147
Damien Millerb1715dc2000-05-30 13:44:51 +1000148 if (names == NULL || strcmp(names, "") == 0)
Damien Miller78928792000-04-12 20:17:38 +1000149 return 0;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000150 cipher_list = cp = xstrdup(names);
Damien Miller874d77b2000-10-14 16:23:11 +1100151 for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100152 (p = strsep(&cp, CIPHER_SEP))) {
Damien Miller874d77b2000-10-14 16:23:11 +1100153 c = cipher_by_name(p);
154 if (c == NULL || c->number != SSH_CIPHER_SSH2) {
155 debug("bad cipher %s [%s]", p, names);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000156 xfree(cipher_list);
Damien Miller78928792000-04-12 20:17:38 +1000157 return 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100158 } else {
Damien Miller50a41ed2000-10-16 12:14:42 +1100159 debug3("cipher ok: %s [%s]", p, names);
Damien Miller78928792000-04-12 20:17:38 +1000160 }
161 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100162 debug3("ciphers ok: [%s]", names);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000163 xfree(cipher_list);
Damien Miller78928792000-04-12 20:17:38 +1000164 return 1;
165}
166
Damien Miller5428f641999-11-25 11:54:57 +1100167/*
168 * Parses the name of the cipher. Returns the number of the corresponding
169 * cipher, or -1 on error.
170 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000171
172int
173cipher_number(const char *name)
174{
Damien Miller874d77b2000-10-14 16:23:11 +1100175 Cipher *c;
Damien Millerb1715dc2000-05-30 13:44:51 +1000176 if (name == NULL)
177 return -1;
Darren Tucker660db782005-01-24 21:57:11 +1100178 for (c = ciphers; c->name != NULL; c++)
179 if (strcasecmp(c->name, name) == 0)
180 return c->number;
181 return -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100182}
183
184char *
185cipher_name(int id)
186{
187 Cipher *c = cipher_by_number(id);
188 return (c==NULL) ? "<unknown>" : c->name;
189}
190
191void
Damien Miller21cf4e02002-02-19 15:26:42 +1100192cipher_init(CipherContext *cc, Cipher *cipher,
193 const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000194 int do_encrypt)
Damien Miller874d77b2000-10-14 16:23:11 +1100195{
Damien Miller21cf4e02002-02-19 15:26:42 +1100196 static int dowarn = 1;
Damien Millerc7375ac2002-03-11 10:51:17 +1100197#ifdef SSH_OLD_EVP
198 EVP_CIPHER *type;
199#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100200 const EVP_CIPHER *type;
201 int klen;
Darren Tuckera55ec772005-06-09 21:45:10 +1000202#endif
Damien Miller3710f272005-05-26 12:19:17 +1000203 u_char *junk, *discard;
Damien Miller21cf4e02002-02-19 15:26:42 +1100204
205 if (cipher->number == SSH_CIPHER_DES) {
206 if (dowarn) {
207 error("Warning: use of DES is strongly discouraged "
208 "due to cryptographic weaknesses");
209 dowarn = 0;
210 }
211 if (keylen > 8)
212 keylen = 8;
213 }
214 cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
215
Damien Miller874d77b2000-10-14 16:23:11 +1100216 if (keylen < cipher->key_len)
217 fatal("cipher_init: key length %d is insufficient for %s.",
218 keylen, cipher->name);
219 if (iv != NULL && ivlen < cipher->block_size)
220 fatal("cipher_init: iv length %d is insufficient for %s.",
221 ivlen, cipher->name);
222 cc->cipher = cipher;
Damien Miller21cf4e02002-02-19 15:26:42 +1100223
224 type = (*cipher->evptype)();
225
226 EVP_CIPHER_CTX_init(&cc->evp);
Damien Millerc7375ac2002-03-11 10:51:17 +1100227#ifdef SSH_OLD_EVP
228 if (type->key_len > 0 && type->key_len != keylen) {
229 debug("cipher_init: set keylen (%d -> %d)",
230 type->key_len, keylen);
231 type->key_len = keylen;
232 }
233 EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
Darren Tuckere5a604f2004-06-23 12:28:31 +1000234 (do_encrypt == CIPHER_ENCRYPT));
Damien Millerc7375ac2002-03-11 10:51:17 +1100235#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100236 if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000237 (do_encrypt == CIPHER_ENCRYPT)) == 0)
Damien Miller21cf4e02002-02-19 15:26:42 +1100238 fatal("cipher_init: EVP_CipherInit failed for %s",
239 cipher->name);
240 klen = EVP_CIPHER_CTX_key_length(&cc->evp);
Damien Millereccb9de2005-06-17 12:59:34 +1000241 if (klen > 0 && keylen != (u_int)klen) {
Ben Lindstrom064496f2002-12-23 02:04:22 +0000242 debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
Damien Miller21cf4e02002-02-19 15:26:42 +1100243 if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
244 fatal("cipher_init: set keylen failed (%d -> %d)",
245 klen, keylen);
246 }
247 if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
248 fatal("cipher_init: EVP_CipherInit: set key failed for %s",
249 cipher->name);
Damien Millerc7375ac2002-03-11 10:51:17 +1100250#endif
Damien Miller3710f272005-05-26 12:19:17 +1000251
Damien Miller46d38de2005-07-17 17:02:09 +1000252 if (cipher->discard_len > 0) {
Damien Miller3710f272005-05-26 12:19:17 +1000253 junk = xmalloc(cipher->discard_len);
254 discard = xmalloc(cipher->discard_len);
255 if (EVP_Cipher(&cc->evp, discard, junk,
256 cipher->discard_len) == 0)
257 fatal("evp_crypt: EVP_Cipher failed during discard");
258 memset(discard, 0, cipher->discard_len);
259 xfree(junk);
260 xfree(discard);
261 }
Damien Miller874d77b2000-10-14 16:23:11 +1100262}
263
264void
Damien Miller963f6b22002-02-19 15:21:23 +1100265cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
Damien Miller874d77b2000-10-14 16:23:11 +1100266{
267 if (len % cc->cipher->block_size)
268 fatal("cipher_encrypt: bad plaintext length %d", len);
Damien Miller21cf4e02002-02-19 15:26:42 +1100269 if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
270 fatal("evp_crypt: EVP_Cipher failed");
Damien Miller874d77b2000-10-14 16:23:11 +1100271}
272
273void
Damien Miller963f6b22002-02-19 15:21:23 +1100274cipher_cleanup(CipherContext *cc)
Damien Miller874d77b2000-10-14 16:23:11 +1100275{
Damien Miller21cf4e02002-02-19 15:26:42 +1100276 if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
277 error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000278}
279
Damien Miller5428f641999-11-25 11:54:57 +1100280/*
281 * Selects the cipher, and keys if by computing the MD5 checksum of the
282 * passphrase and using the resulting 16 bytes as the key.
283 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000284
Damien Miller4af51302000-04-16 11:18:38 +1000285void
Damien Miller874d77b2000-10-14 16:23:11 +1100286cipher_set_key_string(CipherContext *cc, Cipher *cipher,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000287 const char *passphrase, int do_encrypt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000288{
Damien Miller95def091999-11-25 00:26:21 +1100289 MD5_CTX md;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000290 u_char digest[16];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000291
Damien Miller95def091999-11-25 00:26:21 +1100292 MD5_Init(&md);
Damien Miller874d77b2000-10-14 16:23:11 +1100293 MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
Damien Miller95def091999-11-25 00:26:21 +1100294 MD5_Final(digest, &md);
295
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000296 cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
Damien Miller95def091999-11-25 00:26:21 +1100297
298 memset(digest, 0, sizeof(digest));
299 memset(&md, 0, sizeof(md));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300}
Damien Miller21cf4e02002-02-19 15:26:42 +1100301
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000302/*
Ben Lindstrom212faca2002-03-22 01:39:44 +0000303 * Exports an IV from the CipherContext required to export the key
304 * state back from the unprivileged child to the privileged parent
305 * process.
306 */
307
308int
Damien Millerf58b58c2003-11-17 21:18:23 +1100309cipher_get_keyiv_len(const CipherContext *cc)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000310{
311 Cipher *c = cc->cipher;
312 int ivlen;
313
314 if (c->number == SSH_CIPHER_3DES)
315 ivlen = 24;
316 else
317 ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
318 return (ivlen);
319}
320
321void
322cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
323{
324 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000325 int evplen;
326
327 switch (c->number) {
328 case SSH_CIPHER_SSH2:
329 case SSH_CIPHER_DES:
330 case SSH_CIPHER_BLOWFISH:
331 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
Damien Millereccb9de2005-06-17 12:59:34 +1000332 if (evplen <= 0)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000333 return;
Damien Millereccb9de2005-06-17 12:59:34 +1000334 if ((u_int)evplen != len)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000335 fatal("%s: wrong iv length %d != %d", __func__,
Ben Lindstrom212faca2002-03-22 01:39:44 +0000336 evplen, len);
Ben Lindstromf088f432002-06-06 20:50:07 +0000337#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Millera201bb32003-05-14 13:41:23 +1000338 if (c->evptype == evp_rijndael)
339 ssh_rijndael_iv(&cc->evp, 0, iv, len);
340 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000341#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000342 if (c->evptype == evp_aes_128_ctr)
343 ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
344 else
Damien Millera201bb32003-05-14 13:41:23 +1000345 memcpy(iv, cc->evp.iv, len);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000346 break;
Damien Millera201bb32003-05-14 13:41:23 +1000347 case SSH_CIPHER_3DES:
348 ssh1_3des_iv(&cc->evp, 0, iv, 24);
349 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000350 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000351 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000352 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000353}
354
355void
356cipher_set_keyiv(CipherContext *cc, u_char *iv)
357{
358 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000359 int evplen = 0;
360
361 switch (c->number) {
362 case SSH_CIPHER_SSH2:
363 case SSH_CIPHER_DES:
364 case SSH_CIPHER_BLOWFISH:
365 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
366 if (evplen == 0)
367 return;
Ben Lindstromf088f432002-06-06 20:50:07 +0000368#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Millera201bb32003-05-14 13:41:23 +1000369 if (c->evptype == evp_rijndael)
370 ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
371 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000372#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000373 if (c->evptype == evp_aes_128_ctr)
374 ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
375 else
Damien Millera201bb32003-05-14 13:41:23 +1000376 memcpy(cc->evp.iv, iv, evplen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000377 break;
Damien Millera201bb32003-05-14 13:41:23 +1000378 case SSH_CIPHER_3DES:
379 ssh1_3des_iv(&cc->evp, 1, iv, 24);
380 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000381 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000382 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000383 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000384}
385
386#if OPENSSL_VERSION_NUMBER < 0x00907000L
387#define EVP_X_STATE(evp) &(evp).c
388#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
389#else
390#define EVP_X_STATE(evp) (evp).cipher_data
391#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
392#endif
393
394int
Damien Millerf58b58c2003-11-17 21:18:23 +1100395cipher_get_keycontext(const CipherContext *cc, u_char *dat)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000396{
397 Cipher *c = cc->cipher;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000398 int plen = 0;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000399
Damien Miller4f0fe682004-01-27 21:19:21 +1100400 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000401 plen = EVP_X_STATE_LEN(cc->evp);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000402 if (dat == NULL)
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000403 return (plen);
404 memcpy(dat, EVP_X_STATE(cc->evp), plen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000405 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000406 return (plen);
407}
408
409void
410cipher_set_keycontext(CipherContext *cc, u_char *dat)
411{
412 Cipher *c = cc->cipher;
413 int plen;
414
Damien Miller4f0fe682004-01-27 21:19:21 +1100415 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom212faca2002-03-22 01:39:44 +0000416 plen = EVP_X_STATE_LEN(cc->evp);
417 memcpy(EVP_X_STATE(cc->evp), dat, plen);
418 }
Damien Miller21cf4e02002-02-19 15:26:42 +1100419}