1 /* $OpenBSD: e_aes_cbc_hmac_sha1.c,v 1.16 2021/12/12 21:30:13 tb Exp $ */
2 /* ====================================================================
3 * Copyright (c) 2011-2013 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * licensing@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 */
50
51 #include <stdio.h>
52 #include <string.h>
53
54 #include <openssl/opensslconf.h>
55
56 #if !defined(OPENSSL_NO_AES) && !defined(OPENSSL_NO_SHA1)
57
58 #include <openssl/evp.h>
59 #include <openssl/objects.h>
60 #include <openssl/aes.h>
61 #include <openssl/sha.h>
62
63 #include "constant_time_locl.h"
64 #include "evp_locl.h"
65
66 #define TLS1_1_VERSION 0x0302
67
68 typedef struct {
69 AES_KEY ks;
70 SHA_CTX head, tail, md;
71 size_t payload_length; /* AAD length in decrypt case */
72 union {
73 unsigned int tls_ver;
74 unsigned char tls_aad[16]; /* 13 used */
75 } aux;
76 } EVP_AES_HMAC_SHA1;
77
78 #define NO_PAYLOAD_LENGTH ((size_t)-1)
79
80 #if defined(AES_ASM) && ( \
81 defined(__x86_64) || defined(__x86_64__) || \
82 defined(_M_AMD64) || defined(_M_X64) || \
83 defined(__INTEL__) )
84
85 #include "x86_arch.h"
86
87 #if defined(__GNUC__) && __GNUC__>=2
88 # define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
89 #endif
90
91 int aesni_set_encrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
92 int aesni_set_decrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
93
94 void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
95 size_t length, const AES_KEY *key, unsigned char *ivec, int enc);
96
97 void aesni_cbc_sha1_enc (const void *inp, void *out, size_t blocks,
98 const AES_KEY *key, unsigned char iv[16], SHA_CTX *ctx, const void *in0);
99
100 #define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
101
102 static int
aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * inkey,const unsigned char * iv,int enc)103 aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey,
104 const unsigned char *iv, int enc)
105 {
106 EVP_AES_HMAC_SHA1 *key = data(ctx);
107 int ret;
108
109 if (enc)
110 ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
111 else
112 ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);
113
114 SHA1_Init(&key->head); /* handy when benchmarking */
115 key->tail = key->head;
116 key->md = key->head;
117
118 key->payload_length = NO_PAYLOAD_LENGTH;
119
120 return ret < 0 ? 0 : 1;
121 }
122
123 #define STITCHED_CALL
124
125 #if !defined(STITCHED_CALL)
126 #define aes_off 0
127 #endif
128
129 void sha1_block_data_order (void *c, const void *p, size_t len);
130
131 static void
sha1_update(SHA_CTX * c,const void * data,size_t len)132 sha1_update(SHA_CTX *c, const void *data, size_t len)
133 {
134 const unsigned char *ptr = data;
135 size_t res;
136
137 if ((res = c->num)) {
138 res = SHA_CBLOCK - res;
139 if (len < res)
140 res = len;
141 SHA1_Update(c, ptr, res);
142 ptr += res;
143 len -= res;
144 }
145
146 res = len % SHA_CBLOCK;
147 len -= res;
148
149 if (len) {
150 sha1_block_data_order(c, ptr, len / SHA_CBLOCK);
151
152 ptr += len;
153 c->Nh += len >> 29;
154 c->Nl += len <<= 3;
155 if (c->Nl < (unsigned int)len)
156 c->Nh++;
157 }
158
159 if (res)
160 SHA1_Update(c, ptr, res);
161 }
162
163 #ifdef SHA1_Update
164 #undef SHA1_Update
165 #endif
166 #define SHA1_Update sha1_update
167
168 static int
aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t len)169 aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
170 const unsigned char *in, size_t len)
171 {
172 EVP_AES_HMAC_SHA1 *key = data(ctx);
173 unsigned int l;
174 size_t plen = key->payload_length,
175 iv = 0, /* explicit IV in TLS 1.1 and later */
176 sha_off = 0;
177 #if defined(STITCHED_CALL)
178 size_t aes_off = 0, blocks;
179
180 sha_off = SHA_CBLOCK - key->md.num;
181 #endif
182
183 key->payload_length = NO_PAYLOAD_LENGTH;
184
185 if (len % AES_BLOCK_SIZE)
186 return 0;
187
188 if (ctx->encrypt) {
189 if (plen == NO_PAYLOAD_LENGTH)
190 plen = len;
191 else if (len != ((plen + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) &
192 -AES_BLOCK_SIZE))
193 return 0;
194 else if (key->aux.tls_ver >= TLS1_1_VERSION)
195 iv = AES_BLOCK_SIZE;
196
197 #if defined(STITCHED_CALL)
198 if (plen > (sha_off + iv) &&
199 (blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
200 SHA1_Update(&key->md, in + iv, sha_off);
201
202 aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
203 ctx->iv, &key->md, in + iv + sha_off);
204 blocks *= SHA_CBLOCK;
205 aes_off += blocks;
206 sha_off += blocks;
207 key->md.Nh += blocks >> 29;
208 key->md.Nl += blocks <<= 3;
209 if (key->md.Nl < (unsigned int)blocks)
210 key->md.Nh++;
211 } else {
212 sha_off = 0;
213 }
214 #endif
215 sha_off += iv;
216 SHA1_Update(&key->md, in + sha_off, plen - sha_off);
217
218 if (plen != len) { /* "TLS" mode of operation */
219 if (in != out)
220 memcpy(out + aes_off, in + aes_off,
221 plen - aes_off);
222
223 /* calculate HMAC and append it to payload */
224 SHA1_Final(out + plen, &key->md);
225 key->md = key->tail;
226 SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
227 SHA1_Final(out + plen, &key->md);
228
229 /* pad the payload|hmac */
230 plen += SHA_DIGEST_LENGTH;
231 for (l = len - plen - 1; plen < len; plen++)
232 out[plen] = l;
233
234 /* encrypt HMAC|padding at once */
235 aesni_cbc_encrypt(out + aes_off, out + aes_off,
236 len - aes_off, &key->ks, ctx->iv, 1);
237 } else {
238 aesni_cbc_encrypt(in + aes_off, out + aes_off,
239 len - aes_off, &key->ks, ctx->iv, 1);
240 }
241 } else {
242 union {
243 unsigned int u[SHA_DIGEST_LENGTH/sizeof(unsigned int)];
244 unsigned char c[32 + SHA_DIGEST_LENGTH];
245 } mac, *pmac;
246
247 /* arrange cache line alignment */
248 pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));
249
250 /* decrypt HMAC|padding at once */
251 aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);
252
253 if (plen == 0 || plen == NO_PAYLOAD_LENGTH) {
254 SHA1_Update(&key->md, out, len);
255 } else if (plen < 4) {
256 return 0;
257 } else { /* "TLS" mode of operation */
258 size_t inp_len, mask, j, i;
259 unsigned int res, maxpad, pad, bitlen;
260 int ret = 1;
261 union {
262 unsigned int u[SHA_LBLOCK];
263 unsigned char c[SHA_CBLOCK];
264 }
265 *data = (void *)key->md.data;
266
267 if ((key->aux.tls_aad[plen - 4] << 8 |
268 key->aux.tls_aad[plen - 3]) >= TLS1_1_VERSION)
269 iv = AES_BLOCK_SIZE;
270
271 if (len < (iv + SHA_DIGEST_LENGTH + 1))
272 return 0;
273
274 /* omit explicit iv */
275 out += iv;
276 len -= iv;
277
278 /* figure out payload length */
279 pad = out[len - 1];
280 maxpad = len - (SHA_DIGEST_LENGTH + 1);
281 maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
282 maxpad &= 255;
283
284 ret &= constant_time_ge(maxpad, pad);
285
286 inp_len = len - (SHA_DIGEST_LENGTH + pad + 1);
287 mask = (0 - ((inp_len - len) >>
288 (sizeof(inp_len) * 8 - 1)));
289 inp_len &= mask;
290 ret &= (int)mask;
291
292 key->aux.tls_aad[plen - 2] = inp_len >> 8;
293 key->aux.tls_aad[plen - 1] = inp_len;
294
295 /* calculate HMAC */
296 key->md = key->head;
297 SHA1_Update(&key->md, key->aux.tls_aad, plen);
298
299 #if 1
300 len -= SHA_DIGEST_LENGTH; /* amend mac */
301 if (len >= (256 + SHA_CBLOCK)) {
302 j = (len - (256 + SHA_CBLOCK)) &
303 (0 - SHA_CBLOCK);
304 j += SHA_CBLOCK - key->md.num;
305 SHA1_Update(&key->md, out, j);
306 out += j;
307 len -= j;
308 inp_len -= j;
309 }
310
311 /* but pretend as if we hashed padded payload */
312 bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */
313 #ifdef BSWAP
314 bitlen = BSWAP(bitlen);
315 #else
316 mac.c[0] = 0;
317 mac.c[1] = (unsigned char)(bitlen >> 16);
318 mac.c[2] = (unsigned char)(bitlen >> 8);
319 mac.c[3] = (unsigned char)bitlen;
320 bitlen = mac.u[0];
321 #endif
322
323 pmac->u[0] = 0;
324 pmac->u[1] = 0;
325 pmac->u[2] = 0;
326 pmac->u[3] = 0;
327 pmac->u[4] = 0;
328
329 for (res = key->md.num, j = 0; j < len; j++) {
330 size_t c = out[j];
331 mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
332 c &= mask;
333 c |= 0x80 & ~mask &
334 ~((inp_len - j) >> (sizeof(j) * 8 - 8));
335 data->c[res++] = (unsigned char)c;
336
337 if (res != SHA_CBLOCK)
338 continue;
339
340 /* j is not incremented yet */
341 mask = 0 - ((inp_len + 7 - j) >>
342 (sizeof(j) * 8 - 1));
343 data->u[SHA_LBLOCK - 1] |= bitlen&mask;
344 sha1_block_data_order(&key->md, data, 1);
345 mask &= 0 - ((j - inp_len - 72) >>
346 (sizeof(j) * 8 - 1));
347 pmac->u[0] |= key->md.h0 & mask;
348 pmac->u[1] |= key->md.h1 & mask;
349 pmac->u[2] |= key->md.h2 & mask;
350 pmac->u[3] |= key->md.h3 & mask;
351 pmac->u[4] |= key->md.h4 & mask;
352 res = 0;
353 }
354
355 for (i = res; i < SHA_CBLOCK; i++, j++)
356 data->c[i] = 0;
357
358 if (res > SHA_CBLOCK - 8) {
359 mask = 0 - ((inp_len + 8 - j) >>
360 (sizeof(j) * 8 - 1));
361 data->u[SHA_LBLOCK - 1] |= bitlen & mask;
362 sha1_block_data_order(&key->md, data, 1);
363 mask &= 0 - ((j - inp_len - 73) >>
364 (sizeof(j) * 8 - 1));
365 pmac->u[0] |= key->md.h0 & mask;
366 pmac->u[1] |= key->md.h1 & mask;
367 pmac->u[2] |= key->md.h2 & mask;
368 pmac->u[3] |= key->md.h3 & mask;
369 pmac->u[4] |= key->md.h4 & mask;
370
371 memset(data, 0, SHA_CBLOCK);
372 j += 64;
373 }
374 data->u[SHA_LBLOCK - 1] = bitlen;
375 sha1_block_data_order(&key->md, data, 1);
376 mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
377 pmac->u[0] |= key->md.h0 & mask;
378 pmac->u[1] |= key->md.h1 & mask;
379 pmac->u[2] |= key->md.h2 & mask;
380 pmac->u[3] |= key->md.h3 & mask;
381 pmac->u[4] |= key->md.h4 & mask;
382
383 #ifdef BSWAP
384 pmac->u[0] = BSWAP(pmac->u[0]);
385 pmac->u[1] = BSWAP(pmac->u[1]);
386 pmac->u[2] = BSWAP(pmac->u[2]);
387 pmac->u[3] = BSWAP(pmac->u[3]);
388 pmac->u[4] = BSWAP(pmac->u[4]);
389 #else
390 for (i = 0; i < 5; i++) {
391 res = pmac->u[i];
392 pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
393 pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
394 pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
395 pmac->c[4 * i + 3] = (unsigned char)res;
396 }
397 #endif
398 len += SHA_DIGEST_LENGTH;
399 #else
400 SHA1_Update(&key->md, out, inp_len);
401 res = key->md.num;
402 SHA1_Final(pmac->c, &key->md);
403
404 {
405 unsigned int inp_blocks, pad_blocks;
406
407 /* but pretend as if we hashed padded payload */
408 inp_blocks = 1 + ((SHA_CBLOCK - 9 - res) >>
409 (sizeof(res) * 8 - 1));
410 res += (unsigned int)(len - inp_len);
411 pad_blocks = res / SHA_CBLOCK;
412 res %= SHA_CBLOCK;
413 pad_blocks += 1 + ((SHA_CBLOCK - 9 - res) >>
414 (sizeof(res) * 8 - 1));
415 for (; inp_blocks < pad_blocks; inp_blocks++)
416 sha1_block_data_order(&key->md,
417 data, 1);
418 }
419 #endif
420 key->md = key->tail;
421 SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
422 SHA1_Final(pmac->c, &key->md);
423
424 /* verify HMAC */
425 out += inp_len;
426 len -= inp_len;
427 #if 1
428 {
429 unsigned char *p =
430 out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
431 size_t off = out - p;
432 unsigned int c, cmask;
433
434 maxpad += SHA_DIGEST_LENGTH;
435 for (res = 0, i = 0, j = 0; j < maxpad; j++) {
436 c = p[j];
437 cmask = ((int)(j - off -
438 SHA_DIGEST_LENGTH)) >>
439 (sizeof(int) * 8 - 1);
440 res |= (c ^ pad) & ~cmask; /* ... and padding */
441 cmask &= ((int)(off - 1 - j)) >>
442 (sizeof(int) * 8 - 1);
443 res |= (c ^ pmac->c[i]) & cmask;
444 i += 1 & cmask;
445 }
446 maxpad -= SHA_DIGEST_LENGTH;
447
448 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
449 ret &= (int)~res;
450 }
451 #else
452 for (res = 0, i = 0; i < SHA_DIGEST_LENGTH; i++)
453 res |= out[i] ^ pmac->c[i];
454 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
455 ret &= (int)~res;
456
457 /* verify padding */
458 pad = (pad & ~res) | (maxpad & res);
459 out = out + len - 1 - pad;
460 for (res = 0, i = 0; i < pad; i++)
461 res |= out[i] ^ pad;
462
463 res = (0 - res) >> (sizeof(res) * 8 - 1);
464 ret &= (int)~res;
465 #endif
466 return ret;
467 }
468 }
469
470 return 1;
471 }
472
473 static int
aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX * ctx,int type,int arg,void * ptr)474 aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
475 {
476 EVP_AES_HMAC_SHA1 *key = data(ctx);
477
478 switch (type) {
479 case EVP_CTRL_AEAD_SET_MAC_KEY:
480 {
481 unsigned int i;
482 unsigned char hmac_key[64];
483
484 memset(hmac_key, 0, sizeof(hmac_key));
485
486 if (arg > (int)sizeof(hmac_key)) {
487 SHA1_Init(&key->head);
488 SHA1_Update(&key->head, ptr, arg);
489 SHA1_Final(hmac_key, &key->head);
490 } else {
491 memcpy(hmac_key, ptr, arg);
492 }
493
494 for (i = 0; i < sizeof(hmac_key); i++)
495 hmac_key[i] ^= 0x36; /* ipad */
496 SHA1_Init(&key->head);
497 SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));
498
499 for (i = 0; i < sizeof(hmac_key); i++)
500 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
501 SHA1_Init(&key->tail);
502 SHA1_Update(&key->tail, hmac_key, sizeof(hmac_key));
503
504 explicit_bzero(hmac_key, sizeof(hmac_key));
505
506 return 1;
507 }
508 case EVP_CTRL_AEAD_TLS1_AAD:
509 {
510 unsigned char *p = ptr;
511 unsigned int len;
512
513 /* RFC 5246, 6.2.3.3: additional data has length 13 */
514 if (arg != 13)
515 return -1;
516
517 len = p[arg - 2] << 8 | p[arg - 1];
518
519 if (ctx->encrypt) {
520 key->payload_length = len;
521 if ((key->aux.tls_ver = p[arg - 4] << 8 |
522 p[arg - 3]) >= TLS1_1_VERSION) {
523 len -= AES_BLOCK_SIZE;
524 p[arg - 2] = len >> 8;
525 p[arg - 1] = len;
526 }
527 key->md = key->head;
528 SHA1_Update(&key->md, p, arg);
529
530 return (int)(((len + SHA_DIGEST_LENGTH +
531 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) - len);
532 } else {
533 memcpy(key->aux.tls_aad, ptr, arg);
534 key->payload_length = arg;
535
536 return SHA_DIGEST_LENGTH;
537 }
538 }
539 default:
540 return -1;
541 }
542 }
543
544 static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = {
545 #ifdef NID_aes_128_cbc_hmac_sha1
546 .nid = NID_aes_128_cbc_hmac_sha1,
547 #else
548 .nid = NID_undef,
549 #endif
550 .block_size = 16,
551 .key_len = 16,
552 .iv_len = 16,
553 .flags = EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
554 EVP_CIPH_FLAG_AEAD_CIPHER,
555 .init = aesni_cbc_hmac_sha1_init_key,
556 .do_cipher = aesni_cbc_hmac_sha1_cipher,
557 .ctx_size = sizeof(EVP_AES_HMAC_SHA1),
558 .ctrl = aesni_cbc_hmac_sha1_ctrl
559 };
560
561 static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = {
562 #ifdef NID_aes_256_cbc_hmac_sha1
563 .nid = NID_aes_256_cbc_hmac_sha1,
564 #else
565 .nid = NID_undef,
566 #endif
567 .block_size = 16,
568 .key_len = 32,
569 .iv_len = 16,
570 .flags = EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
571 EVP_CIPH_FLAG_AEAD_CIPHER,
572 .init = aesni_cbc_hmac_sha1_init_key,
573 .do_cipher = aesni_cbc_hmac_sha1_cipher,
574 .ctx_size = sizeof(EVP_AES_HMAC_SHA1),
575 .ctrl = aesni_cbc_hmac_sha1_ctrl
576 };
577
578 const EVP_CIPHER *
EVP_aes_128_cbc_hmac_sha1(void)579 EVP_aes_128_cbc_hmac_sha1(void)
580 {
581 return (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) ?
582 &aesni_128_cbc_hmac_sha1_cipher : NULL;
583 }
584
585 const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void)586 EVP_aes_256_cbc_hmac_sha1(void)
587 {
588 return (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) ?
589 &aesni_256_cbc_hmac_sha1_cipher : NULL;
590 }
591 #else
592 const EVP_CIPHER *
EVP_aes_128_cbc_hmac_sha1(void)593 EVP_aes_128_cbc_hmac_sha1(void)
594 {
595 return NULL;
596 }
597
598 const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void)599 EVP_aes_256_cbc_hmac_sha1(void)
600 {
601 return NULL;
602 }
603 #endif
604 #endif
605