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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * | |
6 | * 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". | |
11 | * | |
12 | * | |
13 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
14 | * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved. | |
15 | * | |
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. | |
35 | */ | |
36 | ||
37 | #include "includes.h" | |
e9a17296 | 38 | RCSID("$OpenBSD: cipher.c,v 1.52 2002/02/18 13:05:32 markus Exp $"); |
3c0ef626 | 39 | |
40 | #include "xmalloc.h" | |
41 | #include "log.h" | |
42 | #include "cipher.h" | |
43 | ||
44 | #include <openssl/md5.h> | |
e9a17296 | 45 | #include "rijndael.h" |
46 | ||
47 | static EVP_CIPHER *evp_ssh1_3des(void); | |
48 | static EVP_CIPHER *evp_ssh1_bf(void); | |
49 | static EVP_CIPHER *evp_rijndael(void); | |
50 | ||
51 | struct Cipher { | |
52 | char *name; | |
53 | int number; /* for ssh1 only */ | |
54 | u_int block_size; | |
55 | u_int key_len; | |
56 | EVP_CIPHER *(*evptype)(void); | |
57 | } ciphers[] = { | |
58 | { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null }, | |
59 | { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc }, | |
60 | { "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des }, | |
61 | { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf }, | |
62 | ||
63 | { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc }, | |
64 | { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc }, | |
65 | { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc }, | |
66 | { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 }, | |
67 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael }, | |
68 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael }, | |
69 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, | |
70 | ||
71 | { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } | |
72 | }; | |
3c0ef626 | 73 | |
e9a17296 | 74 | /*--*/ |
3c0ef626 | 75 | |
e9a17296 | 76 | u_int |
77 | cipher_blocksize(Cipher *c) | |
3c0ef626 | 78 | { |
e9a17296 | 79 | return (c->block_size); |
3c0ef626 | 80 | } |
e9a17296 | 81 | u_int |
82 | cipher_keylen(Cipher *c) | |
3c0ef626 | 83 | { |
e9a17296 | 84 | return (c->key_len); |
3c0ef626 | 85 | } |
86 | ||
3c0ef626 | 87 | u_int |
88 | cipher_mask_ssh1(int client) | |
89 | { | |
90 | u_int mask = 0; | |
e9a17296 | 91 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ |
3c0ef626 | 92 | mask |= 1 << SSH_CIPHER_BLOWFISH; |
93 | if (client) { | |
94 | mask |= 1 << SSH_CIPHER_DES; | |
95 | } | |
96 | return mask; | |
97 | } | |
98 | ||
99 | Cipher * | |
100 | cipher_by_name(const char *name) | |
101 | { | |
102 | Cipher *c; | |
103 | for (c = ciphers; c->name != NULL; c++) | |
104 | if (strcasecmp(c->name, name) == 0) | |
105 | return c; | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | Cipher * | |
110 | cipher_by_number(int id) | |
111 | { | |
112 | Cipher *c; | |
113 | for (c = ciphers; c->name != NULL; c++) | |
114 | if (c->number == id) | |
115 | return c; | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | #define CIPHER_SEP "," | |
120 | int | |
121 | ciphers_valid(const char *names) | |
122 | { | |
123 | Cipher *c; | |
124 | char *ciphers, *cp; | |
125 | char *p; | |
126 | ||
127 | if (names == NULL || strcmp(names, "") == 0) | |
128 | return 0; | |
129 | ciphers = cp = xstrdup(names); | |
130 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; | |
e9a17296 | 131 | (p = strsep(&cp, CIPHER_SEP))) { |
3c0ef626 | 132 | c = cipher_by_name(p); |
133 | if (c == NULL || c->number != SSH_CIPHER_SSH2) { | |
134 | debug("bad cipher %s [%s]", p, names); | |
135 | xfree(ciphers); | |
136 | return 0; | |
137 | } else { | |
138 | debug3("cipher ok: %s [%s]", p, names); | |
139 | } | |
140 | } | |
141 | debug3("ciphers ok: [%s]", names); | |
142 | xfree(ciphers); | |
143 | return 1; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Parses the name of the cipher. Returns the number of the corresponding | |
148 | * cipher, or -1 on error. | |
149 | */ | |
150 | ||
151 | int | |
152 | cipher_number(const char *name) | |
153 | { | |
154 | Cipher *c; | |
155 | if (name == NULL) | |
156 | return -1; | |
157 | c = cipher_by_name(name); | |
158 | return (c==NULL) ? -1 : c->number; | |
159 | } | |
160 | ||
161 | char * | |
162 | cipher_name(int id) | |
163 | { | |
164 | Cipher *c = cipher_by_number(id); | |
165 | return (c==NULL) ? "<unknown>" : c->name; | |
166 | } | |
167 | ||
168 | void | |
169 | cipher_init(CipherContext *cc, Cipher *cipher, | |
e9a17296 | 170 | const u_char *key, u_int keylen, const u_char *iv, u_int ivlen, |
171 | int encrypt) | |
3c0ef626 | 172 | { |
e9a17296 | 173 | static int dowarn = 1; |
174 | const EVP_CIPHER *type; | |
175 | int klen; | |
176 | ||
177 | if (cipher->number == SSH_CIPHER_DES) { | |
178 | if (dowarn) { | |
179 | error("Warning: use of DES is strongly discouraged " | |
180 | "due to cryptographic weaknesses"); | |
181 | dowarn = 0; | |
182 | } | |
183 | if (keylen > 8) | |
184 | keylen = 8; | |
185 | } | |
186 | cc->plaintext = (cipher->number == SSH_CIPHER_NONE); | |
187 | ||
3c0ef626 | 188 | if (keylen < cipher->key_len) |
189 | fatal("cipher_init: key length %d is insufficient for %s.", | |
190 | keylen, cipher->name); | |
191 | if (iv != NULL && ivlen < cipher->block_size) | |
192 | fatal("cipher_init: iv length %d is insufficient for %s.", | |
193 | ivlen, cipher->name); | |
194 | cc->cipher = cipher; | |
e9a17296 | 195 | |
196 | type = (*cipher->evptype)(); | |
197 | ||
198 | EVP_CIPHER_CTX_init(&cc->evp); | |
199 | if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv, | |
200 | (encrypt == CIPHER_ENCRYPT)) == 0) | |
201 | fatal("cipher_init: EVP_CipherInit failed for %s", | |
202 | cipher->name); | |
203 | klen = EVP_CIPHER_CTX_key_length(&cc->evp); | |
204 | if (klen > 0 && keylen != klen) { | |
205 | debug("cipher_init: set keylen (%d -> %d)", klen, keylen); | |
206 | if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) | |
207 | fatal("cipher_init: set keylen failed (%d -> %d)", | |
208 | klen, keylen); | |
209 | } | |
210 | if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) | |
211 | fatal("cipher_init: EVP_CipherInit: set key failed for %s", | |
212 | cipher->name); | |
3c0ef626 | 213 | } |
214 | ||
215 | void | |
e9a17296 | 216 | cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) |
3c0ef626 | 217 | { |
218 | if (len % cc->cipher->block_size) | |
219 | fatal("cipher_encrypt: bad plaintext length %d", len); | |
e9a17296 | 220 | if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0) |
221 | fatal("evp_crypt: EVP_Cipher failed"); | |
3c0ef626 | 222 | } |
223 | ||
224 | void | |
e9a17296 | 225 | cipher_cleanup(CipherContext *cc) |
3c0ef626 | 226 | { |
e9a17296 | 227 | if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0) |
228 | error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed"); | |
3c0ef626 | 229 | } |
230 | ||
231 | /* | |
232 | * Selects the cipher, and keys if by computing the MD5 checksum of the | |
233 | * passphrase and using the resulting 16 bytes as the key. | |
234 | */ | |
235 | ||
236 | void | |
237 | cipher_set_key_string(CipherContext *cc, Cipher *cipher, | |
e9a17296 | 238 | const char *passphrase, int encrypt) |
3c0ef626 | 239 | { |
240 | MD5_CTX md; | |
241 | u_char digest[16]; | |
242 | ||
243 | MD5_Init(&md); | |
244 | MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); | |
245 | MD5_Final(digest, &md); | |
246 | ||
e9a17296 | 247 | cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt); |
3c0ef626 | 248 | |
249 | memset(digest, 0, sizeof(digest)); | |
250 | memset(&md, 0, sizeof(md)); | |
251 | } | |
e9a17296 | 252 | |
253 | /* Implementations for other non-EVP ciphers */ | |
254 | ||
255 | /* | |
256 | * This is used by SSH1: | |
257 | * | |
258 | * What kind of triple DES are these 2 routines? | |
259 | * | |
260 | * Why is there a redundant initialization vector? | |
261 | * | |
262 | * If only iv3 was used, then, this would till effect have been | |
263 | * outer-cbc. However, there is also a private iv1 == iv2 which | |
264 | * perhaps makes differential analysis easier. On the other hand, the | |
265 | * private iv1 probably makes the CRC-32 attack ineffective. This is a | |
266 | * result of that there is no longer any known iv1 to use when | |
267 | * choosing the X block. | |
268 | */ | |
269 | struct ssh1_3des_ctx | |
270 | { | |
271 | EVP_CIPHER_CTX k1, k2, k3; | |
272 | }; | |
273 | static int | |
274 | ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, | |
275 | int enc) | |
276 | { | |
277 | struct ssh1_3des_ctx *c; | |
278 | u_char *k1, *k2, *k3; | |
279 | ||
280 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
281 | c = xmalloc(sizeof(*c)); | |
282 | EVP_CIPHER_CTX_set_app_data(ctx, c); | |
283 | } | |
284 | if (key == NULL) | |
285 | return (1); | |
286 | if (enc == -1) | |
287 | enc = ctx->encrypt; | |
288 | k1 = k2 = k3 = (u_char *) key; | |
289 | k2 += 8; | |
290 | if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) { | |
291 | if (enc) | |
292 | k3 += 16; | |
293 | else | |
294 | k1 += 16; | |
295 | } | |
296 | EVP_CIPHER_CTX_init(&c->k1); | |
297 | EVP_CIPHER_CTX_init(&c->k2); | |
298 | EVP_CIPHER_CTX_init(&c->k3); | |
299 | if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 || | |
300 | EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 || | |
301 | EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) { | |
302 | memset(c, 0, sizeof(*c)); | |
303 | xfree(c); | |
304 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
305 | return (0); | |
306 | } | |
307 | return (1); | |
308 | } | |
309 | static int | |
310 | ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len) | |
311 | { | |
312 | struct ssh1_3des_ctx *c; | |
313 | ||
314 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
315 | error("ssh1_3des_cbc: no context"); | |
316 | return (0); | |
317 | } | |
318 | if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 || | |
319 | EVP_Cipher(&c->k2, dest, dest, len) == 0 || | |
320 | EVP_Cipher(&c->k3, dest, dest, len) == 0) | |
321 | return (0); | |
322 | return (1); | |
323 | } | |
324 | static int | |
325 | ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx) | |
326 | { | |
327 | struct ssh1_3des_ctx *c; | |
328 | ||
329 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { | |
330 | memset(c, 0, sizeof(*c)); | |
331 | xfree(c); | |
332 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
333 | } | |
334 | return (1); | |
335 | } | |
336 | static EVP_CIPHER * | |
337 | evp_ssh1_3des(void) | |
338 | { | |
339 | static EVP_CIPHER ssh1_3des; | |
340 | ||
341 | memset(&ssh1_3des, 0, sizeof(EVP_CIPHER)); | |
342 | ssh1_3des.nid = NID_undef; | |
343 | ssh1_3des.block_size = 8; | |
344 | ssh1_3des.iv_len = 0; | |
345 | ssh1_3des.key_len = 16; | |
346 | ssh1_3des.init = ssh1_3des_init; | |
347 | ssh1_3des.cleanup = ssh1_3des_cleanup; | |
348 | ssh1_3des.do_cipher = ssh1_3des_cbc; | |
349 | ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH; | |
350 | return (&ssh1_3des); | |
351 | } | |
352 | ||
353 | /* | |
354 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before | |
355 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). | |
356 | */ | |
357 | static void | |
358 | swap_bytes(const u_char *src, u_char *dst, int n) | |
359 | { | |
360 | u_char c[4]; | |
361 | ||
362 | /* Process 4 bytes every lap. */ | |
363 | for (n = n / 4; n > 0; n--) { | |
364 | c[3] = *src++; | |
365 | c[2] = *src++; | |
366 | c[1] = *src++; | |
367 | c[0] = *src++; | |
368 | ||
369 | *dst++ = c[0]; | |
370 | *dst++ = c[1]; | |
371 | *dst++ = c[2]; | |
372 | *dst++ = c[3]; | |
373 | } | |
374 | } | |
375 | static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL; | |
376 | static int | |
377 | bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) | |
378 | { | |
379 | int ret; | |
380 | ||
381 | swap_bytes(in, out, len); | |
382 | ret = (*orig_bf)(ctx, out, out, len); | |
383 | swap_bytes(out, out, len); | |
384 | return (ret); | |
385 | } | |
386 | static EVP_CIPHER * | |
387 | evp_ssh1_bf(void) | |
388 | { | |
389 | static EVP_CIPHER ssh1_bf; | |
390 | ||
391 | memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); | |
392 | orig_bf = ssh1_bf.do_cipher; | |
393 | ssh1_bf.nid = NID_undef; | |
394 | ssh1_bf.do_cipher = bf_ssh1_cipher; | |
395 | ssh1_bf.key_len = 32; | |
396 | return (&ssh1_bf); | |
397 | } | |
398 | ||
399 | /* RIJNDAEL */ | |
400 | #define RIJNDAEL_BLOCKSIZE 16 | |
401 | struct ssh_rijndael_ctx | |
402 | { | |
403 | rijndael_ctx r_ctx; | |
404 | u_char r_iv[RIJNDAEL_BLOCKSIZE]; | |
405 | }; | |
406 | ||
407 | static int | |
408 | ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, | |
409 | int enc) | |
410 | { | |
411 | struct ssh_rijndael_ctx *c; | |
412 | ||
413 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
414 | c = xmalloc(sizeof(*c)); | |
415 | EVP_CIPHER_CTX_set_app_data(ctx, c); | |
416 | } | |
417 | if (key != NULL) { | |
418 | if (enc == -1) | |
419 | enc = ctx->encrypt; | |
420 | rijndael_set_key(&c->r_ctx, (u_char *)key, | |
421 | 8*EVP_CIPHER_CTX_key_length(ctx), enc); | |
422 | } | |
423 | if (iv != NULL) | |
424 | memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE); | |
425 | return (1); | |
426 | } | |
427 | static int | |
428 | ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, | |
429 | u_int len) | |
430 | { | |
431 | struct ssh_rijndael_ctx *c; | |
432 | u_char buf[RIJNDAEL_BLOCKSIZE]; | |
433 | u_char *cprev, *cnow, *plain, *ivp; | |
434 | int i, j, blocks = len / RIJNDAEL_BLOCKSIZE; | |
435 | ||
436 | if (len == 0) | |
437 | return (1); | |
438 | if (len % RIJNDAEL_BLOCKSIZE) | |
439 | fatal("ssh_rijndael_cbc: bad len %d", len); | |
440 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
441 | error("ssh_rijndael_cbc: no context"); | |
442 | return (0); | |
443 | } | |
444 | if (ctx->encrypt) { | |
445 | cnow = dest; | |
446 | plain = (u_char *)src; | |
447 | cprev = c->r_iv; | |
448 | for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE, | |
449 | cnow+=RIJNDAEL_BLOCKSIZE) { | |
450 | for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) | |
451 | buf[j] = plain[j] ^ cprev[j]; | |
452 | rijndael_encrypt(&c->r_ctx, buf, cnow); | |
453 | cprev = cnow; | |
454 | } | |
455 | memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE); | |
456 | } else { | |
457 | cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE); | |
458 | plain = dest+len-RIJNDAEL_BLOCKSIZE; | |
459 | ||
460 | memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE); | |
461 | for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE, | |
462 | plain-=RIJNDAEL_BLOCKSIZE) { | |
463 | rijndael_decrypt(&c->r_ctx, cnow, plain); | |
464 | ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE; | |
465 | for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) | |
466 | plain[j] ^= ivp[j]; | |
467 | } | |
468 | memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE); | |
469 | } | |
470 | return (1); | |
471 | } | |
472 | static int | |
473 | ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx) | |
474 | { | |
475 | struct ssh_rijndael_ctx *c; | |
476 | ||
477 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { | |
478 | memset(c, 0, sizeof(*c)); | |
479 | xfree(c); | |
480 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
481 | } | |
482 | return (1); | |
483 | } | |
484 | static EVP_CIPHER * | |
485 | evp_rijndael(void) | |
486 | { | |
487 | static EVP_CIPHER rijndal_cbc; | |
488 | ||
489 | memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER)); | |
490 | rijndal_cbc.nid = NID_undef; | |
491 | rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE; | |
492 | rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE; | |
493 | rijndal_cbc.key_len = 16; | |
494 | rijndal_cbc.init = ssh_rijndael_init; | |
495 | rijndal_cbc.cleanup = ssh_rijndael_cleanup; | |
496 | rijndal_cbc.do_cipher = ssh_rijndael_cbc; | |
497 | rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | | |
498 | EVP_CIPH_ALWAYS_CALL_INIT; | |
499 | return (&rijndal_cbc); | |
500 | } |