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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 Millerb2d1c2b2004-01-27 21:20:59 +110038RCSID("$OpenBSD: cipher.c,v 1.68 2004/01/23 19:26:33 hshoexer 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
Damien Millerc7375ac2002-03-11 10:51:17 +110046#if OPENSSL_VERSION_NUMBER < 0x00906000L
47#define SSH_OLD_EVP
48#define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
49#endif
50
Ben Lindstromf088f432002-06-06 20:50:07 +000051#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Miller3a3261f2003-05-15 13:37:19 +100052extern const EVP_CIPHER *evp_rijndael(void);
53extern void ssh_rijndael_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
Ben Lindstromf088f432002-06-06 20:50:07 +000054#endif
Damien Miller4f0fe682004-01-27 21:19:21 +110055
56#if !defined(EVP_CTRL_SET_ACSS_MODE)
Darren Tucker6977fe72004-02-06 15:26:10 +110057# if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
Damien Miller4f0fe682004-01-27 21:19:21 +110058extern const EVP_CIPHER *evp_acss(void);
59# define EVP_acss evp_acss
60# define EVP_CTRL_SET_ACSS_MODE xxx /* used below */
61# else
62# define EVP_acss NULL /* Don't try to support ACSS on older OpenSSL */
63# endif /* (OPENSSL_VERSION_NUMBER >= 0x00906000L) */
64#endif /* !defined(EVP_CTRL_SET_ACSS_MODE) */
65
Damien Miller3a3261f2003-05-15 13:37:19 +100066extern const EVP_CIPHER *evp_ssh1_bf(void);
67extern const EVP_CIPHER *evp_ssh1_3des(void);
68extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
Damien Millerf5399c22003-05-18 20:53:59 +100069extern const EVP_CIPHER *evp_aes_128_ctr(void);
70extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071
Damien Miller963f6b22002-02-19 15:21:23 +110072struct Cipher {
73 char *name;
74 int number; /* for ssh1 only */
75 u_int block_size;
76 u_int key_len;
Ben Lindstrom6a246412002-06-06 19:48:16 +000077 const EVP_CIPHER *(*evptype)(void);
Damien Miller21cf4e02002-02-19 15:26:42 +110078} ciphers[] = {
79 { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null },
80 { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc },
81 { "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des },
82 { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf },
Damien Miller963f6b22002-02-19 15:21:23 +110083
Damien Miller21cf4e02002-02-19 15:26:42 +110084 { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc },
85 { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc },
86 { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc },
87 { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 },
Ben Lindstromf088f432002-06-06 20:50:07 +000088#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Miller21cf4e02002-02-19 15:26:42 +110089 { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael },
90 { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael },
91 { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
Ben Lindstrom8a725a82002-04-04 22:10:38 +000092 { "rijndael-cbc@lysator.liu.se",
93 SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
Ben Lindstromf088f432002-06-06 20:50:07 +000094#else
95 { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc },
96 { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc },
97 { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
98 { "rijndael-cbc@lysator.liu.se",
99 SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
100#endif
Darren Tucker693f8a82004-02-07 12:29:39 +1100101#if OPENSSL_VERSION_NUMBER >= 0x00905000L
Damien Millerf5399c22003-05-18 20:53:59 +1000102 { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, evp_aes_128_ctr },
103 { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, evp_aes_128_ctr },
104 { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, evp_aes_128_ctr },
Damien Miller5c3a5582003-09-23 22:12:38 +1000105#endif
Damien Miller4f0fe682004-01-27 21:19:21 +1100106#if defined(EVP_CTRL_SET_ACSS_MODE)
Damien Millerb2d1c2b2004-01-27 21:20:59 +1100107 { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, EVP_acss },
Damien Miller4f0fe682004-01-27 21:19:21 +1100108#endif
Damien Miller21cf4e02002-02-19 15:26:42 +1100109 { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110};
111
Damien Miller874d77b2000-10-14 16:23:11 +1100112/*--*/
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000113
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000114u_int
Damien Millerf58b58c2003-11-17 21:18:23 +1100115cipher_blocksize(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +1100116{
117 return (c->block_size);
118}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000119
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000120u_int
Damien Millerf58b58c2003-11-17 21:18:23 +1100121cipher_keylen(const Cipher *c)
Damien Miller963f6b22002-02-19 15:21:23 +1100122{
123 return (c->key_len);
124}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000125
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000126u_int
Damien Millerf58b58c2003-11-17 21:18:23 +1100127cipher_get_number(const Cipher *c)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000128{
129 return (c->number);
130}
Damien Miller963f6b22002-02-19 15:21:23 +1100131
Ben Lindstrom46c16222000-12-22 01:43:59 +0000132u_int
Damien Miller874d77b2000-10-14 16:23:11 +1100133cipher_mask_ssh1(int client)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000134{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000135 u_int mask = 0;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100136 mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
Damien Miller95def091999-11-25 00:26:21 +1100137 mask |= 1 << SSH_CIPHER_BLOWFISH;
Damien Miller874d77b2000-10-14 16:23:11 +1100138 if (client) {
139 mask |= 1 << SSH_CIPHER_DES;
140 }
Damien Miller1383bd82000-04-06 12:32:37 +1000141 return mask;
142}
Damien Miller874d77b2000-10-14 16:23:11 +1100143
144Cipher *
145cipher_by_name(const char *name)
Damien Miller1383bd82000-04-06 12:32:37 +1000146{
Damien Miller874d77b2000-10-14 16:23:11 +1100147 Cipher *c;
148 for (c = ciphers; c->name != NULL; c++)
149 if (strcasecmp(c->name, name) == 0)
150 return c;
151 return NULL;
Damien Miller1383bd82000-04-06 12:32:37 +1000152}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153
Damien Miller874d77b2000-10-14 16:23:11 +1100154Cipher *
155cipher_by_number(int id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000156{
Damien Miller874d77b2000-10-14 16:23:11 +1100157 Cipher *c;
158 for (c = ciphers; c->name != NULL; c++)
159 if (c->number == id)
160 return c;
161 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000162}
163
Damien Miller78928792000-04-12 20:17:38 +1000164#define CIPHER_SEP ","
165int
166ciphers_valid(const char *names)
167{
Damien Miller874d77b2000-10-14 16:23:11 +1100168 Cipher *c;
Damien Miller37023962000-07-11 17:31:38 +1000169 char *ciphers, *cp;
Damien Miller78928792000-04-12 20:17:38 +1000170 char *p;
Damien Miller78928792000-04-12 20:17:38 +1000171
Damien Millerb1715dc2000-05-30 13:44:51 +1000172 if (names == NULL || strcmp(names, "") == 0)
Damien Miller78928792000-04-12 20:17:38 +1000173 return 0;
Damien Miller37023962000-07-11 17:31:38 +1000174 ciphers = cp = xstrdup(names);
Damien Miller874d77b2000-10-14 16:23:11 +1100175 for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100176 (p = strsep(&cp, CIPHER_SEP))) {
Damien Miller874d77b2000-10-14 16:23:11 +1100177 c = cipher_by_name(p);
178 if (c == NULL || c->number != SSH_CIPHER_SSH2) {
179 debug("bad cipher %s [%s]", p, names);
Damien Miller78928792000-04-12 20:17:38 +1000180 xfree(ciphers);
181 return 0;
Damien Miller874d77b2000-10-14 16:23:11 +1100182 } else {
Damien Miller50a41ed2000-10-16 12:14:42 +1100183 debug3("cipher ok: %s [%s]", p, names);
Damien Miller78928792000-04-12 20:17:38 +1000184 }
185 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100186 debug3("ciphers ok: [%s]", names);
Damien Miller78928792000-04-12 20:17:38 +1000187 xfree(ciphers);
188 return 1;
189}
190
Damien Miller5428f641999-11-25 11:54:57 +1100191/*
192 * Parses the name of the cipher. Returns the number of the corresponding
193 * cipher, or -1 on error.
194 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195
196int
197cipher_number(const char *name)
198{
Damien Miller874d77b2000-10-14 16:23:11 +1100199 Cipher *c;
Damien Millerb1715dc2000-05-30 13:44:51 +1000200 if (name == NULL)
201 return -1;
Damien Miller874d77b2000-10-14 16:23:11 +1100202 c = cipher_by_name(name);
203 return (c==NULL) ? -1 : c->number;
204}
205
206char *
207cipher_name(int id)
208{
209 Cipher *c = cipher_by_number(id);
210 return (c==NULL) ? "<unknown>" : c->name;
211}
212
213void
Damien Miller21cf4e02002-02-19 15:26:42 +1100214cipher_init(CipherContext *cc, Cipher *cipher,
215 const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
216 int encrypt)
Damien Miller874d77b2000-10-14 16:23:11 +1100217{
Damien Miller21cf4e02002-02-19 15:26:42 +1100218 static int dowarn = 1;
Damien Millerc7375ac2002-03-11 10:51:17 +1100219#ifdef SSH_OLD_EVP
220 EVP_CIPHER *type;
221#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100222 const EVP_CIPHER *type;
Damien Millerc7375ac2002-03-11 10:51:17 +1100223#endif
Damien Miller21cf4e02002-02-19 15:26:42 +1100224 int klen;
225
226 if (cipher->number == SSH_CIPHER_DES) {
227 if (dowarn) {
228 error("Warning: use of DES is strongly discouraged "
229 "due to cryptographic weaknesses");
230 dowarn = 0;
231 }
232 if (keylen > 8)
233 keylen = 8;
234 }
235 cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
236
Damien Miller874d77b2000-10-14 16:23:11 +1100237 if (keylen < cipher->key_len)
238 fatal("cipher_init: key length %d is insufficient for %s.",
239 keylen, cipher->name);
240 if (iv != NULL && ivlen < cipher->block_size)
241 fatal("cipher_init: iv length %d is insufficient for %s.",
242 ivlen, cipher->name);
243 cc->cipher = cipher;
Damien Miller21cf4e02002-02-19 15:26:42 +1100244
245 type = (*cipher->evptype)();
246
247 EVP_CIPHER_CTX_init(&cc->evp);
Damien Millerc7375ac2002-03-11 10:51:17 +1100248#ifdef SSH_OLD_EVP
249 if (type->key_len > 0 && type->key_len != keylen) {
250 debug("cipher_init: set keylen (%d -> %d)",
251 type->key_len, keylen);
252 type->key_len = keylen;
253 }
254 EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
255 (encrypt == CIPHER_ENCRYPT));
256#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100257 if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
258 (encrypt == CIPHER_ENCRYPT)) == 0)
259 fatal("cipher_init: EVP_CipherInit failed for %s",
260 cipher->name);
261 klen = EVP_CIPHER_CTX_key_length(&cc->evp);
262 if (klen > 0 && keylen != klen) {
Ben Lindstrom064496f2002-12-23 02:04:22 +0000263 debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
Damien Miller21cf4e02002-02-19 15:26:42 +1100264 if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
265 fatal("cipher_init: set keylen failed (%d -> %d)",
266 klen, keylen);
267 }
268 if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
269 fatal("cipher_init: EVP_CipherInit: set key failed for %s",
270 cipher->name);
Damien Millerc7375ac2002-03-11 10:51:17 +1100271#endif
Damien Miller874d77b2000-10-14 16:23:11 +1100272}
273
274void
Damien Miller963f6b22002-02-19 15:21:23 +1100275cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
Damien Miller874d77b2000-10-14 16:23:11 +1100276{
277 if (len % cc->cipher->block_size)
278 fatal("cipher_encrypt: bad plaintext length %d", len);
Damien Millerc7375ac2002-03-11 10:51:17 +1100279#ifdef SSH_OLD_EVP
280 EVP_Cipher(&cc->evp, dest, (u_char *)src, len);
281#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100282 if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
283 fatal("evp_crypt: EVP_Cipher failed");
Damien Millerc7375ac2002-03-11 10:51:17 +1100284#endif
Damien Miller874d77b2000-10-14 16:23:11 +1100285}
286
287void
Damien Miller963f6b22002-02-19 15:21:23 +1100288cipher_cleanup(CipherContext *cc)
Damien Miller874d77b2000-10-14 16:23:11 +1100289{
Damien Millerc7375ac2002-03-11 10:51:17 +1100290#ifdef SSH_OLD_EVP
291 EVP_CIPHER_CTX_cleanup(&cc->evp);
292#else
Damien Miller21cf4e02002-02-19 15:26:42 +1100293 if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
294 error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
Damien Millerc7375ac2002-03-11 10:51:17 +1100295#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000296}
297
Damien Miller5428f641999-11-25 11:54:57 +1100298/*
299 * Selects the cipher, and keys if by computing the MD5 checksum of the
300 * passphrase and using the resulting 16 bytes as the key.
301 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000302
Damien Miller4af51302000-04-16 11:18:38 +1000303void
Damien Miller874d77b2000-10-14 16:23:11 +1100304cipher_set_key_string(CipherContext *cc, Cipher *cipher,
Damien Miller963f6b22002-02-19 15:21:23 +1100305 const char *passphrase, int encrypt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000306{
Damien Miller95def091999-11-25 00:26:21 +1100307 MD5_CTX md;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000308 u_char digest[16];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000309
Damien Miller95def091999-11-25 00:26:21 +1100310 MD5_Init(&md);
Damien Miller874d77b2000-10-14 16:23:11 +1100311 MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
Damien Miller95def091999-11-25 00:26:21 +1100312 MD5_Final(digest, &md);
313
Damien Miller963f6b22002-02-19 15:21:23 +1100314 cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt);
Damien Miller95def091999-11-25 00:26:21 +1100315
316 memset(digest, 0, sizeof(digest));
317 memset(&md, 0, sizeof(md));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000318}
Damien Miller21cf4e02002-02-19 15:26:42 +1100319
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000320/*
Ben Lindstrom212faca2002-03-22 01:39:44 +0000321 * Exports an IV from the CipherContext required to export the key
322 * state back from the unprivileged child to the privileged parent
323 * process.
324 */
325
326int
Damien Millerf58b58c2003-11-17 21:18:23 +1100327cipher_get_keyiv_len(const CipherContext *cc)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000328{
329 Cipher *c = cc->cipher;
330 int ivlen;
331
332 if (c->number == SSH_CIPHER_3DES)
333 ivlen = 24;
334 else
335 ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
336 return (ivlen);
337}
338
339void
340cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
341{
342 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000343 int evplen;
344
345 switch (c->number) {
346 case SSH_CIPHER_SSH2:
347 case SSH_CIPHER_DES:
348 case SSH_CIPHER_BLOWFISH:
349 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
350 if (evplen == 0)
351 return;
352 if (evplen != len)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000353 fatal("%s: wrong iv length %d != %d", __func__,
Ben Lindstrom212faca2002-03-22 01:39:44 +0000354 evplen, len);
Ben Lindstromf088f432002-06-06 20:50:07 +0000355#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Millera201bb32003-05-14 13:41:23 +1000356 if (c->evptype == evp_rijndael)
357 ssh_rijndael_iv(&cc->evp, 0, iv, len);
358 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000359#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000360 if (c->evptype == evp_aes_128_ctr)
361 ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
362 else
Damien Millera201bb32003-05-14 13:41:23 +1000363 memcpy(iv, cc->evp.iv, len);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000364 break;
Damien Millera201bb32003-05-14 13:41:23 +1000365 case SSH_CIPHER_3DES:
366 ssh1_3des_iv(&cc->evp, 0, iv, 24);
367 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000368 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000369 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000370 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000371}
372
373void
374cipher_set_keyiv(CipherContext *cc, u_char *iv)
375{
376 Cipher *c = cc->cipher;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000377 int evplen = 0;
378
379 switch (c->number) {
380 case SSH_CIPHER_SSH2:
381 case SSH_CIPHER_DES:
382 case SSH_CIPHER_BLOWFISH:
383 evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
384 if (evplen == 0)
385 return;
Ben Lindstromf088f432002-06-06 20:50:07 +0000386#if OPENSSL_VERSION_NUMBER < 0x00907000L
Damien Millera201bb32003-05-14 13:41:23 +1000387 if (c->evptype == evp_rijndael)
388 ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
389 else
Ben Lindstromf088f432002-06-06 20:50:07 +0000390#endif
Damien Millerf5399c22003-05-18 20:53:59 +1000391 if (c->evptype == evp_aes_128_ctr)
392 ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
393 else
Damien Millera201bb32003-05-14 13:41:23 +1000394 memcpy(cc->evp.iv, iv, evplen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000395 break;
Damien Millera201bb32003-05-14 13:41:23 +1000396 case SSH_CIPHER_3DES:
397 ssh1_3des_iv(&cc->evp, 1, iv, 24);
398 break;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000399 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000400 fatal("%s: bad cipher %d", __func__, c->number);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000401 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000402}
403
404#if OPENSSL_VERSION_NUMBER < 0x00907000L
405#define EVP_X_STATE(evp) &(evp).c
406#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
407#else
408#define EVP_X_STATE(evp) (evp).cipher_data
409#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
410#endif
411
412int
Damien Millerf58b58c2003-11-17 21:18:23 +1100413cipher_get_keycontext(const CipherContext *cc, u_char *dat)
Ben Lindstrom212faca2002-03-22 01:39:44 +0000414{
415 Cipher *c = cc->cipher;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000416 int plen = 0;
Ben Lindstrom212faca2002-03-22 01:39:44 +0000417
Damien Miller4f0fe682004-01-27 21:19:21 +1100418 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000419 plen = EVP_X_STATE_LEN(cc->evp);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000420 if (dat == NULL)
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000421 return (plen);
422 memcpy(dat, EVP_X_STATE(cc->evp), plen);
Ben Lindstrom212faca2002-03-22 01:39:44 +0000423 }
Ben Lindstrom212faca2002-03-22 01:39:44 +0000424 return (plen);
425}
426
427void
428cipher_set_keycontext(CipherContext *cc, u_char *dat)
429{
430 Cipher *c = cc->cipher;
431 int plen;
432
Damien Miller4f0fe682004-01-27 21:19:21 +1100433 if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
Ben Lindstrom212faca2002-03-22 01:39:44 +0000434 plen = EVP_X_STATE_LEN(cc->evp);
435 memcpy(EVP_X_STATE(cc->evp), dat, plen);
436 }
Damien Miller21cf4e02002-02-19 15:26:42 +1100437}