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1/* $OpenBSD: eng_aesni.c,v 1.11 2018/04/14 07:18:37 tb Exp $ */
2/*
3 * Support for Intel AES-NI intruction set
4 * Author: Huang Ying <ying.huang@intel.com>
5 *
6 * Intel AES-NI is a new set of Single Instruction Multiple Data
7 * (SIMD) instructions that are going to be introduced in the next
8 * generation of Intel processor, as of 2009. These instructions
9 * enable fast and secure data encryption and decryption, using the
10 * Advanced Encryption Standard (AES), defined by FIPS Publication
11 * number 197. The architecture introduces six instructions that
12 * offer full hardware support for AES. Four of them support high
13 * performance data encryption and decryption, and the other two
14 * instructions support the AES key expansion procedure.
15 *
16 * The white paper can be downloaded from:
17 * http://softwarecommunity.intel.com/isn/downloads/intelavx/AES-Instructions-Set_WP.pdf
18 *
19 * This file is based on engines/e_padlock.c
20 */
21
22/* ====================================================================
23 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
24 *
25 * Redistribution and use in source and binary forms, with or without
26 * modification, are permitted provided that the following conditions
27 * are met:
28 *
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 *
32 * 2. Redistributions in binary form must reproduce the above copyright
33 * notice, this list of conditions and the following disclaimer in
34 * the documentation and/or other materials provided with the
35 * distribution.
36 *
37 * 3. All advertising materials mentioning features or use of this
38 * software must display the following acknowledgment:
39 * "This product includes software developed by the OpenSSL Project
40 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
41 *
42 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
43 * endorse or promote products derived from this software without
44 * prior written permission. For written permission, please contact
45 * licensing@OpenSSL.org.
46 *
47 * 5. Products derived from this software may not be called "OpenSSL"
48 * nor may "OpenSSL" appear in their names without prior written
49 * permission of the OpenSSL Project.
50 *
51 * 6. Redistributions of any form whatsoever must retain the following
52 * acknowledgment:
53 * "This product includes software developed by the OpenSSL Project
54 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
55 *
56 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
57 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
60 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
62 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
63 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
65 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
66 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
67 * OF THE POSSIBILITY OF SUCH DAMAGE.
68 * ====================================================================
69 *
70 * This product includes cryptographic software written by Eric Young
71 * (eay@cryptsoft.com). This product includes software written by Tim
72 * Hudson (tjh@cryptsoft.com).
73 *
74 */
75
76#include <stdio.h>
77
78#include <openssl/opensslconf.h>
79
80#if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_AES_NI) && !defined(OPENSSL_NO_AES)
81
82#include <openssl/aes.h>
83#include <openssl/dso.h>
84#include <openssl/engine.h>
85#include <openssl/err.h>
86#include <openssl/evp.h>
87
88/* AES-NI is available *ONLY* on some x86 CPUs. Not only that it
89 doesn't exist elsewhere, but it even can't be compiled on other
90 platforms! */
91#undef COMPILE_HW_AESNI
92#if (defined(__x86_64) || defined(__x86_64__) || \
93 defined(_M_AMD64) || defined(_M_X64) || \
94 defined(OPENSSL_IA32_SSE2)) && !defined(OPENSSL_NO_ASM) && !defined(__i386__)
95#define COMPILE_HW_AESNI
96#include "x86_arch.h"
97#endif
98static ENGINE *ENGINE_aesni(void);
99
100void ENGINE_load_aesni(void)
101{
102/* On non-x86 CPUs it just returns. */
103#ifdef COMPILE_HW_AESNI
104 ENGINE *toadd = ENGINE_aesni();
105 if (toadd == NULL)
106 return;
107 ENGINE_add(toadd);
108 ENGINE_register_complete(toadd);
109 ENGINE_free(toadd);
110 ERR_clear_error();
111#endif
112}
113
114#ifdef COMPILE_HW_AESNI
115int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
116 AES_KEY *key);
117int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
118 AES_KEY *key);
119
120void aesni_encrypt(const unsigned char *in, unsigned char *out,
121 const AES_KEY *key);
122void aesni_decrypt(const unsigned char *in, unsigned char *out,
123 const AES_KEY *key);
124
125void aesni_ecb_encrypt(const unsigned char *in, unsigned char *out,
126 size_t length, const AES_KEY *key, int enc);
127void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
128 size_t length, const AES_KEY *key, unsigned char *ivec, int enc);
129
130/* Function for ENGINE detection and control */
131static int aesni_init(ENGINE *e);
132
133/* Cipher Stuff */
134static int aesni_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
135 const int **nids, int nid);
136
137#define AESNI_MIN_ALIGN 16
138#define AESNI_ALIGN(x) \
139 ((void *)(((unsigned long)(x)+AESNI_MIN_ALIGN-1)&~(AESNI_MIN_ALIGN-1)))
140
141/* Engine names */
142static const char aesni_id[] = "aesni",
143 aesni_name[] = "Intel AES-NI engine",
144 no_aesni_name[] = "Intel AES-NI engine (no-aesni)";
145
146
147/* The input and output encrypted as though 128bit cfb mode is being
148 * used. The extra state information to record how much of the
149 * 128bit block we have used is contained in *num;
150 */
151static void
152aesni_cfb128_encrypt(const unsigned char *in, unsigned char *out,
153 unsigned int len, const void *key, unsigned char ivec[16], int *num,
154 int enc)
155{
156 unsigned int n;
157 size_t l = 0;
158
159 n = *num;
160
161 if (enc) {
162#if !defined(OPENSSL_SMALL_FOOTPRINT)
163 if (16%sizeof(size_t) == 0) do { /* always true actually */
164 while (n && len) {
165 *(out++) = ivec[n] ^= *(in++);
166 --len;
167 n = (n + 1) % 16;
168 }
169 while (len >= 16) {
170 aesni_encrypt(ivec, ivec, key);
171 for (n = 0; n < 16; n += sizeof(size_t)) {
172 *(size_t*)(out + n) =
173 *(size_t*)(ivec + n) ^= *(size_t*)(in + n);
174 }
175 len -= 16;
176 out += 16;
177 in += 16;
178 }
179 n = 0;
180 if (len) {
181 aesni_encrypt(ivec, ivec, key);
182 while (len--) {
183 out[n] = ivec[n] ^= in[n];
184 ++n;
185 }
186 }
187 *num = n;
188 return;
189 } while (0);
190 /* the rest would be commonly eliminated by x86* compiler */
191#endif
192 while (l < len) {
193 if (n == 0) {
194 aesni_encrypt(ivec, ivec, key);
195 }
196 out[l] = ivec[n] ^= in[l];
197 ++l;
198 n = (n + 1) % 16;
199 }
200 *num = n;
201 } else {
202#if !defined(OPENSSL_SMALL_FOOTPRINT)
203 if (16%sizeof(size_t) == 0) do { /* always true actually */
204 while (n && len) {
205 unsigned char c;
206 *(out++) = ivec[n] ^ (c = *(in++));
207 ivec[n] = c;
208 --len;
209 n = (n + 1) % 16;
210 }
211 while (len >= 16) {
212 aesni_encrypt(ivec, ivec, key);
213 for (n = 0; n < 16; n += sizeof(size_t)) {
214 size_t t = *(size_t*)(in + n);
215 *(size_t*)(out + n) = *(size_t*)(ivec + n) ^ t;
216 *(size_t*)(ivec + n) = t;
217 }
218 len -= 16;
219 out += 16;
220 in += 16;
221 }
222 n = 0;
223 if (len) {
224 aesni_encrypt(ivec, ivec, key);
225 while (len--) {
226 unsigned char c;
227 out[n] = ivec[n] ^ (c = in[n]);
228 ivec[n] = c;
229 ++n;
230 }
231 }
232 *num = n;
233 return;
234 } while (0);
235 /* the rest would be commonly eliminated by x86* compiler */
236#endif
237 while (l < len) {
238 unsigned char c;
239 if (n == 0) {
240 aesni_encrypt(ivec, ivec, key);
241 }
242 out[l] = ivec[n] ^ (c = in[l]);
243 ivec[n] = c;
244 ++l;
245 n = (n + 1) % 16;
246 }
247 *num = n;
248 }
249}
250
251/* The input and output encrypted as though 128bit ofb mode is being
252 * used. The extra state information to record how much of the
253 * 128bit block we have used is contained in *num;
254 */
255static void
256aesni_ofb128_encrypt(const unsigned char *in, unsigned char *out,
257 unsigned int len, const void *key, unsigned char ivec[16], int *num)
258{
259 unsigned int n;
260 size_t l = 0;
261
262 n = *num;
263
264#if !defined(OPENSSL_SMALL_FOOTPRINT)
265 if (16%sizeof(size_t) == 0) do { /* always true actually */
266 while (n && len) {
267 *(out++) = *(in++) ^ ivec[n];
268 --len;
269 n = (n + 1) % 16;
270 }
271 while (len >= 16) {
272 aesni_encrypt(ivec, ivec, key);
273 for (n = 0; n < 16; n += sizeof(size_t))
274 *(size_t*)(out + n) =
275 *(size_t*)(in + n) ^ *(size_t*)(ivec + n);
276 len -= 16;
277 out += 16;
278 in += 16;
279 }
280 n = 0;
281 if (len) {
282 aesni_encrypt(ivec, ivec, key);
283 while (len--) {
284 out[n] = in[n] ^ ivec[n];
285 ++n;
286 }
287 }
288 *num = n;
289 return;
290 } while (0);
291 /* the rest would be commonly eliminated by x86* compiler */
292#endif
293 while (l < len) {
294 if (n == 0) {
295 aesni_encrypt(ivec, ivec, key);
296 }
297 out[l] = in[l] ^ ivec[n];
298 ++l;
299 n = (n + 1) % 16;
300 }
301
302 *num = n;
303}
304/* ===== Engine "management" functions ===== */
305
306/* Prepare the ENGINE structure for registration */
307static int
308aesni_bind_helper(ENGINE *e)
309{
310 int engage;
311
312 engage = (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) != 0;
313
314 /* Register everything or return with an error */
315 if (!ENGINE_set_id(e, aesni_id) ||
316 !ENGINE_set_name(e, engage ? aesni_name : no_aesni_name) ||
317 !ENGINE_set_init_function(e, aesni_init) ||
318 (engage && !ENGINE_set_ciphers (e, aesni_ciphers)))
319 return 0;
320
321 /* Everything looks good */
322 return 1;
323}
324
325/* Constructor */
326static ENGINE *
327ENGINE_aesni(void)
328{
329 ENGINE *eng = ENGINE_new();
330
331 if (!eng) {
332 return NULL;
333 }
334
335 if (!aesni_bind_helper(eng)) {
336 ENGINE_free(eng);
337 return NULL;
338 }
339
340 return eng;
341}
342
343/* Check availability of the engine */
344static int
345aesni_init(ENGINE *e)
346{
347 return 1;
348}
349
350#if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
351#define NID_aes_128_cfb NID_aes_128_cfb128
352#endif
353
354#if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
355#define NID_aes_128_ofb NID_aes_128_ofb128
356#endif
357
358#if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
359#define NID_aes_192_cfb NID_aes_192_cfb128
360#endif
361
362#if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
363#define NID_aes_192_ofb NID_aes_192_ofb128
364#endif
365
366#if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
367#define NID_aes_256_cfb NID_aes_256_cfb128
368#endif
369
370#if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
371#define NID_aes_256_ofb NID_aes_256_ofb128
372#endif
373
374/* List of supported ciphers. */
375static int aesni_cipher_nids[] = {
376 NID_aes_128_ecb,
377 NID_aes_128_cbc,
378 NID_aes_128_cfb,
379 NID_aes_128_ofb,
380
381 NID_aes_192_ecb,
382 NID_aes_192_cbc,
383 NID_aes_192_cfb,
384 NID_aes_192_ofb,
385
386 NID_aes_256_ecb,
387 NID_aes_256_cbc,
388 NID_aes_256_cfb,
389 NID_aes_256_ofb,
390};
391static int aesni_cipher_nids_num =
392 (sizeof(aesni_cipher_nids) / sizeof(aesni_cipher_nids[0]));
393
394typedef struct {
395 AES_KEY ks;
396 unsigned int _pad1[3];
397} AESNI_KEY;
398
399static int
400aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *user_key,
401 const unsigned char *iv, int enc)
402{
403 int ret;
404 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
405
406 if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE ||
407 (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE ||
408 enc)
409 ret = aesni_set_encrypt_key(user_key, ctx->key_len * 8, key);
410 else
411 ret = aesni_set_decrypt_key(user_key, ctx->key_len * 8, key);
412
413 if (ret < 0) {
414 EVPerror(EVP_R_AES_KEY_SETUP_FAILED);
415 return 0;
416 }
417
418 return 1;
419}
420
421static int
422aesni_cipher_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
423 const unsigned char *in, size_t inl)
424{
425 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
426
427 aesni_ecb_encrypt(in, out, inl, key, ctx->encrypt);
428 return 1;
429}
430
431static int
432aesni_cipher_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
433 const unsigned char *in, size_t inl)
434{
435 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
436
437 aesni_cbc_encrypt(in, out, inl, key, ctx->iv, ctx->encrypt);
438 return 1;
439}
440
441static int
442aesni_cipher_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
443 const unsigned char *in, size_t inl)
444{
445 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
446
447 aesni_cfb128_encrypt(in, out, inl, key, ctx->iv, &ctx->num,
448 ctx->encrypt);
449 return 1;
450}
451
452static int
453aesni_cipher_ofb(EVP_CIPHER_CTX *ctx, unsigned char *out,
454 const unsigned char *in, size_t inl)
455{
456 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
457
458 aesni_ofb128_encrypt(in, out, inl, key, ctx->iv, &ctx->num);
459 return 1;
460}
461
462#define AES_BLOCK_SIZE 16
463
464#define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
465#define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
466#define EVP_CIPHER_block_size_OFB 1
467#define EVP_CIPHER_block_size_CFB 1
468
469/* Declaring so many ciphers by hand would be a pain.
470 Instead introduce a bit of preprocessor magic :-) */
471#define DECLARE_AES_EVP(ksize,lmode,umode) \
472static const EVP_CIPHER aesni_##ksize##_##lmode = { \
473 NID_aes_##ksize##_##lmode, \
474 EVP_CIPHER_block_size_##umode, \
475 ksize / 8, \
476 AES_BLOCK_SIZE, \
477 0 | EVP_CIPH_##umode##_MODE, \
478 aesni_init_key, \
479 aesni_cipher_##lmode, \
480 NULL, \
481 sizeof(AESNI_KEY), \
482 EVP_CIPHER_set_asn1_iv, \
483 EVP_CIPHER_get_asn1_iv, \
484 NULL, \
485 NULL \
486}
487
488DECLARE_AES_EVP(128, ecb, ECB);
489DECLARE_AES_EVP(128, cbc, CBC);
490DECLARE_AES_EVP(128, cfb, CFB);
491DECLARE_AES_EVP(128, ofb, OFB);
492
493DECLARE_AES_EVP(192, ecb, ECB);
494DECLARE_AES_EVP(192, cbc, CBC);
495DECLARE_AES_EVP(192, cfb, CFB);
496DECLARE_AES_EVP(192, ofb, OFB);
497
498DECLARE_AES_EVP(256, ecb, ECB);
499DECLARE_AES_EVP(256, cbc, CBC);
500DECLARE_AES_EVP(256, cfb, CFB);
501DECLARE_AES_EVP(256, ofb, OFB);
502
503static int
504aesni_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid)
505{
506 /* No specific cipher => return a list of supported nids ... */
507 if (!cipher) {
508 *nids = aesni_cipher_nids;
509 return aesni_cipher_nids_num;
510 }
511
512 /* ... or the requested "cipher" otherwise */
513 switch (nid) {
514 case NID_aes_128_ecb:
515 *cipher = &aesni_128_ecb;
516 break;
517 case NID_aes_128_cbc:
518 *cipher = &aesni_128_cbc;
519 break;
520 case NID_aes_128_cfb:
521 *cipher = &aesni_128_cfb;
522 break;
523 case NID_aes_128_ofb:
524 *cipher = &aesni_128_ofb;
525 break;
526
527 case NID_aes_192_ecb:
528 *cipher = &aesni_192_ecb;
529 break;
530 case NID_aes_192_cbc:
531 *cipher = &aesni_192_cbc;
532 break;
533 case NID_aes_192_cfb:
534 *cipher = &aesni_192_cfb;
535 break;
536 case NID_aes_192_ofb:
537 *cipher = &aesni_192_ofb;
538 break;
539
540 case NID_aes_256_ecb:
541 *cipher = &aesni_256_ecb;
542 break;
543 case NID_aes_256_cbc:
544 *cipher = &aesni_256_cbc;
545 break;
546 case NID_aes_256_cfb:
547 *cipher = &aesni_256_cfb;
548 break;
549 case NID_aes_256_ofb:
550 *cipher = &aesni_256_ofb;
551 break;
552
553 default:
554 /* Sorry, we don't support this NID */
555 *cipher = NULL;
556 return 0;
557 }
558 return 1;
559}
560
561#endif /* COMPILE_HW_AESNI */
562#endif /* !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_AESNI) && !defined(OPENSSL_NO_AES) */
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-19 10:05:45 +0000