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diff --git a/src/lib/libcrypto/evp/e_aes_cbc_hmac_sha1.c b/src/lib/libcrypto/evp/e_aes_cbc_hmac_sha1.c
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1/* $OpenBSD: e_aes_cbc_hmac_sha1.c,v 1.12 2016/05/04 15:01:33 tedu 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#include "evp_locl.h"
63#include "constant_time_locl.h"
64
65#ifndef EVP_CIPH_FLAG_AEAD_CIPHER
66#define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
67#define EVP_CTRL_AEAD_TLS1_AAD 0x16
68#define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
69#endif
70
71#define TLS1_1_VERSION 0x0302
72
73typedef struct {
74 AES_KEY ks;
75 SHA_CTX head, tail, md;
76 size_t payload_length; /* AAD length in decrypt case */
77 union {
78 unsigned int tls_ver;
79 unsigned char tls_aad[16]; /* 13 used */
80 } aux;
81} EVP_AES_HMAC_SHA1;
82
83#define NO_PAYLOAD_LENGTH ((size_t)-1)
84
85#if defined(AES_ASM) && ( \
86 defined(__x86_64) || defined(__x86_64__) || \
87 defined(_M_AMD64) || defined(_M_X64) || \
88 defined(__INTEL__) )
89
90#if defined(__GNUC__) && __GNUC__>=2
91# define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
92#endif
93
94extern unsigned int OPENSSL_ia32cap_P[2];
95#define AESNI_CAPABLE (1<<(57-32))
96
97int aesni_set_encrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
98int aesni_set_decrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
99
100void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
101 size_t length, const AES_KEY *key, unsigned char *ivec, int enc);
102
103void aesni_cbc_sha1_enc (const void *inp, void *out, size_t blocks,
104 const AES_KEY *key, unsigned char iv[16], SHA_CTX *ctx, const void *in0);
105
106#define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
107
108static int
109aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey,
110 const unsigned char *iv, int enc)
111{
112 EVP_AES_HMAC_SHA1 *key = data(ctx);
113 int ret;
114
115 if (enc)
116 ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
117 else
118 ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);
119
120 SHA1_Init(&key->head); /* handy when benchmarking */
121 key->tail = key->head;
122 key->md = key->head;
123
124 key->payload_length = NO_PAYLOAD_LENGTH;
125
126 return ret < 0 ? 0 : 1;
127}
128
129#define STITCHED_CALL
130
131#if !defined(STITCHED_CALL)
132#define aes_off 0
133#endif
134
135void sha1_block_data_order (void *c, const void *p, size_t len);
136
137static void
138sha1_update(SHA_CTX *c, const void *data, size_t len)
139{
140 const unsigned char *ptr = data;
141 size_t res;
142
143 if ((res = c->num)) {
144 res = SHA_CBLOCK - res;
145 if (len < res)
146 res = len;
147 SHA1_Update(c, ptr, res);
148 ptr += res;
149 len -= res;
150 }
151
152 res = len % SHA_CBLOCK;
153 len -= res;
154
155 if (len) {
156 sha1_block_data_order(c, ptr, len / SHA_CBLOCK);
157
158 ptr += len;
159 c->Nh += len >> 29;
160 c->Nl += len <<= 3;
161 if (c->Nl < (unsigned int)len)
162 c->Nh++;
163 }
164
165 if (res)
166 SHA1_Update(c, ptr, res);
167}
168
169#ifdef SHA1_Update
170#undef SHA1_Update
171#endif
172#define SHA1_Update sha1_update
173
174static int
175aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
176 const unsigned char *in, size_t len)
177{
178 EVP_AES_HMAC_SHA1 *key = data(ctx);
179 unsigned int l;
180 size_t plen = key->payload_length,
181 iv = 0, /* explicit IV in TLS 1.1 and later */
182 sha_off = 0;
183#if defined(STITCHED_CALL)
184 size_t aes_off = 0, blocks;
185
186 sha_off = SHA_CBLOCK - key->md.num;
187#endif
188
189 key->payload_length = NO_PAYLOAD_LENGTH;
190
191 if (len % AES_BLOCK_SIZE)
192 return 0;
193
194 if (ctx->encrypt) {
195 if (plen == NO_PAYLOAD_LENGTH)
196 plen = len;
197 else if (len != ((plen + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) &
198 -AES_BLOCK_SIZE))
199 return 0;
200 else if (key->aux.tls_ver >= TLS1_1_VERSION)
201 iv = AES_BLOCK_SIZE;
202
203#if defined(STITCHED_CALL)
204 if (plen > (sha_off + iv) &&
205 (blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
206 SHA1_Update(&key->md, in + iv, sha_off);
207
208 aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
209 ctx->iv, &key->md, in + iv + sha_off);
210 blocks *= SHA_CBLOCK;
211 aes_off += blocks;
212 sha_off += blocks;
213 key->md.Nh += blocks >> 29;
214 key->md.Nl += blocks <<= 3;
215 if (key->md.Nl < (unsigned int)blocks)
216 key->md.Nh++;
217 } else {
218 sha_off = 0;
219 }
220#endif
221 sha_off += iv;
222 SHA1_Update(&key->md, in + sha_off, plen - sha_off);
223
224 if (plen != len) { /* "TLS" mode of operation */
225 if (in != out)
226 memcpy(out + aes_off, in + aes_off,
227 plen - aes_off);
228
229 /* calculate HMAC and append it to payload */
230 SHA1_Final(out + plen, &key->md);
231 key->md = key->tail;
232 SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
233 SHA1_Final(out + plen, &key->md);
234
235 /* pad the payload|hmac */
236 plen += SHA_DIGEST_LENGTH;
237 for (l = len - plen - 1; plen < len; plen++)
238 out[plen] = l;
239
240 /* encrypt HMAC|padding at once */
241 aesni_cbc_encrypt(out + aes_off, out + aes_off,
242 len - aes_off, &key->ks, ctx->iv, 1);
243 } else {
244 aesni_cbc_encrypt(in + aes_off, out + aes_off,
245 len - aes_off, &key->ks, ctx->iv, 1);
246 }
247 } else {
248 union {
249 unsigned int u[SHA_DIGEST_LENGTH/sizeof(unsigned int)];
250 unsigned char c[32 + SHA_DIGEST_LENGTH];
251 } mac, *pmac;
252
253 /* arrange cache line alignment */
254 pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));
255
256 /* decrypt HMAC|padding at once */
257 aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);
258
259 if (plen) { /* "TLS" mode of operation */
260 size_t inp_len, mask, j, i;
261 unsigned int res, maxpad, pad, bitlen;
262 int ret = 1;
263 union {
264 unsigned int u[SHA_LBLOCK];
265 unsigned char c[SHA_CBLOCK];
266 }
267 *data = (void *)key->md.data;
268
269 if ((key->aux.tls_aad[plen - 4] << 8 |
270 key->aux.tls_aad[plen - 3]) >= TLS1_1_VERSION)
271 iv = AES_BLOCK_SIZE;
272
273 if (len < (iv + SHA_DIGEST_LENGTH + 1))
274 return 0;
275
276 /* omit explicit iv */
277 out += iv;
278 len -= iv;
279
280 /* figure out payload length */
281 pad = out[len - 1];
282 maxpad = len - (SHA_DIGEST_LENGTH + 1);
283 maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
284 maxpad &= 255;
285
286 ret &= constant_time_ge(maxpad, pad);
287
288 inp_len = len - (SHA_DIGEST_LENGTH + pad + 1);
289 mask = (0 - ((inp_len - len) >>
290 (sizeof(inp_len) * 8 - 1)));
291 inp_len &= mask;
292 ret &= (int)mask;
293
294 key->aux.tls_aad[plen - 2] = inp_len >> 8;
295 key->aux.tls_aad[plen - 1] = inp_len;
296
297 /* calculate HMAC */
298 key->md = key->head;
299 SHA1_Update(&key->md, key->aux.tls_aad, plen);
300
301#if 1
302 len -= SHA_DIGEST_LENGTH; /* amend mac */
303 if (len >= (256 + SHA_CBLOCK)) {
304 j = (len - (256 + SHA_CBLOCK)) &
305 (0 - SHA_CBLOCK);
306 j += SHA_CBLOCK - key->md.num;
307 SHA1_Update(&key->md, out, j);
308 out += j;
309 len -= j;
310 inp_len -= j;
311 }
312
313 /* but pretend as if we hashed padded payload */
314 bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */
315#ifdef BSWAP
316 bitlen = BSWAP(bitlen);
317#else
318 mac.c[0] = 0;
319 mac.c[1] = (unsigned char)(bitlen >> 16);
320 mac.c[2] = (unsigned char)(bitlen >> 8);
321 mac.c[3] = (unsigned char)bitlen;
322 bitlen = mac.u[0];
323#endif
324
325 pmac->u[0] = 0;
326 pmac->u[1] = 0;
327 pmac->u[2] = 0;
328 pmac->u[3] = 0;
329 pmac->u[4] = 0;
330
331 for (res = key->md.num, j = 0; j < len; j++) {
332 size_t c = out[j];
333 mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
334 c &= mask;
335 c |= 0x80 & ~mask &
336 ~((inp_len - j) >> (sizeof(j) * 8 - 8));
337 data->c[res++] = (unsigned char)c;
338
339 if (res != SHA_CBLOCK)
340 continue;
341
342 /* j is not incremented yet */
343 mask = 0 - ((inp_len + 7 - j) >>
344 (sizeof(j) * 8 - 1));
345 data->u[SHA_LBLOCK - 1] |= bitlen&mask;
346 sha1_block_data_order(&key->md, data, 1);
347 mask &= 0 - ((j - inp_len - 72) >>
348 (sizeof(j) * 8 - 1));
349 pmac->u[0] |= key->md.h0 & mask;
350 pmac->u[1] |= key->md.h1 & mask;
351 pmac->u[2] |= key->md.h2 & mask;
352 pmac->u[3] |= key->md.h3 & mask;
353 pmac->u[4] |= key->md.h4 & mask;
354 res = 0;
355 }
356
357 for (i = res; i < SHA_CBLOCK; i++, j++)
358 data->c[i] = 0;
359
360 if (res > SHA_CBLOCK - 8) {
361 mask = 0 - ((inp_len + 8 - j) >>
362 (sizeof(j) * 8 - 1));
363 data->u[SHA_LBLOCK - 1] |= bitlen & mask;
364 sha1_block_data_order(&key->md, data, 1);
365 mask &= 0 - ((j - inp_len - 73) >>
366 (sizeof(j) * 8 - 1));
367 pmac->u[0] |= key->md.h0 & mask;
368 pmac->u[1] |= key->md.h1 & mask;
369 pmac->u[2] |= key->md.h2 & mask;
370 pmac->u[3] |= key->md.h3 & mask;
371 pmac->u[4] |= key->md.h4 & mask;
372
373 memset(data, 0, SHA_CBLOCK);
374 j += 64;
375 }
376 data->u[SHA_LBLOCK - 1] = bitlen;
377 sha1_block_data_order(&key->md, data, 1);
378 mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
379 pmac->u[0] |= key->md.h0 & mask;
380 pmac->u[1] |= key->md.h1 & mask;
381 pmac->u[2] |= key->md.h2 & mask;
382 pmac->u[3] |= key->md.h3 & mask;
383 pmac->u[4] |= key->md.h4 & mask;
384
385#ifdef BSWAP
386 pmac->u[0] = BSWAP(pmac->u[0]);
387 pmac->u[1] = BSWAP(pmac->u[1]);
388 pmac->u[2] = BSWAP(pmac->u[2]);
389 pmac->u[3] = BSWAP(pmac->u[3]);
390 pmac->u[4] = BSWAP(pmac->u[4]);
391#else
392 for (i = 0; i < 5; i++) {
393 res = pmac->u[i];
394 pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
395 pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
396 pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
397 pmac->c[4 * i + 3] = (unsigned char)res;
398 }
399#endif
400 len += SHA_DIGEST_LENGTH;
401#else
402 SHA1_Update(&key->md, out, inp_len);
403 res = key->md.num;
404 SHA1_Final(pmac->c, &key->md);
405
406 {
407 unsigned int inp_blocks, pad_blocks;
408
409 /* but pretend as if we hashed padded payload */
410 inp_blocks = 1 + ((SHA_CBLOCK - 9 - res) >>
411 (sizeof(res) * 8 - 1));
412 res += (unsigned int)(len - inp_len);
413 pad_blocks = res / SHA_CBLOCK;
414 res %= SHA_CBLOCK;
415 pad_blocks += 1 + ((SHA_CBLOCK - 9 - res) >>
416 (sizeof(res) * 8 - 1));
417 for (; inp_blocks < pad_blocks; inp_blocks++)
418 sha1_block_data_order(&key->md,
419 data, 1);
420 }
421#endif
422 key->md = key->tail;
423 SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
424 SHA1_Final(pmac->c, &key->md);
425
426 /* verify HMAC */
427 out += inp_len;
428 len -= inp_len;
429#if 1
430 {
431 unsigned char *p =
432 out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
433 size_t off = out - p;
434 unsigned int c, cmask;
435
436 maxpad += SHA_DIGEST_LENGTH;
437 for (res = 0, i = 0, j = 0; j < maxpad; j++) {
438 c = p[j];
439 cmask = ((int)(j - off -
440 SHA_DIGEST_LENGTH)) >>
441 (sizeof(int) * 8 - 1);
442 res |= (c ^ pad) & ~cmask; /* ... and padding */
443 cmask &= ((int)(off - 1 - j)) >>
444 (sizeof(int) * 8 - 1);
445 res |= (c ^ pmac->c[i]) & cmask;
446 i += 1 & cmask;
447 }
448 maxpad -= SHA_DIGEST_LENGTH;
449
450 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
451 ret &= (int)~res;
452 }
453#else
454 for (res = 0, i = 0; i < SHA_DIGEST_LENGTH; i++)
455 res |= out[i] ^ pmac->c[i];
456 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
457 ret &= (int)~res;
458
459 /* verify padding */
460 pad = (pad & ~res) | (maxpad & res);
461 out = out + len - 1 - pad;
462 for (res = 0, i = 0; i < pad; i++)
463 res |= out[i] ^ pad;
464
465 res = (0 - res) >> (sizeof(res) * 8 - 1);
466 ret &= (int)~res;
467#endif
468 return ret;
469 } else {
470 SHA1_Update(&key->md, out, len);
471 }
472 }
473
474 return 1;
475}
476
477static int
478aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
479{
480 EVP_AES_HMAC_SHA1 *key = data(ctx);
481
482 switch (type) {
483 case EVP_CTRL_AEAD_SET_MAC_KEY:
484 {
485 unsigned int i;
486 unsigned char hmac_key[64];
487
488 memset(hmac_key, 0, sizeof(hmac_key));
489
490 if (arg > (int)sizeof(hmac_key)) {
491 SHA1_Init(&key->head);
492 SHA1_Update(&key->head, ptr, arg);
493 SHA1_Final(hmac_key, &key->head);
494 } else {
495 memcpy(hmac_key, ptr, arg);
496 }
497
498 for (i = 0; i < sizeof(hmac_key); i++)
499 hmac_key[i] ^= 0x36; /* ipad */
500 SHA1_Init(&key->head);
501 SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));
502
503 for (i = 0; i < sizeof(hmac_key); i++)
504 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
505 SHA1_Init(&key->tail);
506 SHA1_Update(&key->tail, hmac_key, sizeof(hmac_key));
507
508 explicit_bzero(hmac_key, sizeof(hmac_key));
509
510 return 1;
511 }
512 case EVP_CTRL_AEAD_TLS1_AAD:
513 {
514 unsigned char *p = ptr;
515 unsigned int len = p[arg - 2] << 8 | p[arg - 1];
516
517 if (ctx->encrypt) {
518 key->payload_length = len;
519 if ((key->aux.tls_ver = p[arg - 4] << 8 |
520 p[arg - 3]) >= TLS1_1_VERSION) {
521 len -= AES_BLOCK_SIZE;
522 p[arg - 2] = len >> 8;
523 p[arg - 1] = len;
524 }
525 key->md = key->head;
526 SHA1_Update(&key->md, p, arg);
527
528 return (int)(((len + SHA_DIGEST_LENGTH +
529 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) - len);
530 } else {
531 if (arg > 13)
532 arg = 13;
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
544static 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
561static 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
578const EVP_CIPHER *
579EVP_aes_128_cbc_hmac_sha1(void)
580{
581 return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
582 &aesni_128_cbc_hmac_sha1_cipher : NULL;
583}
584
585const EVP_CIPHER *
586EVP_aes_256_cbc_hmac_sha1(void)
587{
588 return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
589 &aesni_256_cbc_hmac_sha1_cipher : NULL;
590}
591#else
592const EVP_CIPHER *
593EVP_aes_128_cbc_hmac_sha1(void)
594{
595 return NULL;
596}
597
598const EVP_CIPHER *
599EVP_aes_256_cbc_hmac_sha1(void)
600{
601 return NULL;
602}
603#endif
604#endif
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