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1/*
2 * Support for Intel AES-NI intruction set
3 * Author: Huang Ying <ying.huang@intel.com>
4 *
5 * Intel AES-NI is a new set of Single Instruction Multiple Data
6 * (SIMD) instructions that are going to be introduced in the next
7 * generation of Intel processor, as of 2009. These instructions
8 * enable fast and secure data encryption and decryption, using the
9 * Advanced Encryption Standard (AES), defined by FIPS Publication
10 * number 197. The architecture introduces six instructions that
11 * offer full hardware support for AES. Four of them support high
12 * performance data encryption and decryption, and the other two
13 * instructions support the AES key expansion procedure.
14 *
15 * The white paper can be downloaded from:
16 * http://softwarecommunity.intel.com/isn/downloads/intelavx/AES-Instructions-Set_WP.pdf
17 *
18 * This file is based on engines/e_padlock.c
19 */
20
21/* ====================================================================
22 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 *
28 * 1. Redistributions of source code must retain the above copyright
29 * notice, this list of conditions and the following disclaimer.
30 *
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in
33 * the documentation and/or other materials provided with the
34 * distribution.
35 *
36 * 3. All advertising materials mentioning features or use of this
37 * software must display the following acknowledgment:
38 * "This product includes software developed by the OpenSSL Project
39 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
40 *
41 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
42 * endorse or promote products derived from this software without
43 * prior written permission. For written permission, please contact
44 * licensing@OpenSSL.org.
45 *
46 * 5. Products derived from this software may not be called "OpenSSL"
47 * nor may "OpenSSL" appear in their names without prior written
48 * permission of the OpenSSL Project.
49 *
50 * 6. Redistributions of any form whatsoever must retain the following
51 * acknowledgment:
52 * "This product includes software developed by the OpenSSL Project
53 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
56 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
58 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
59 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
60 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
61 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
62 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
66 * OF THE POSSIBILITY OF SUCH DAMAGE.
67 * ====================================================================
68 *
69 * This product includes cryptographic software written by Eric Young
70 * (eay@cryptsoft.com). This product includes software written by Tim
71 * Hudson (tjh@cryptsoft.com).
72 *
73 */
74
75
76#include <openssl/opensslconf.h>
77
78#if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_AES_NI) && !defined(OPENSSL_NO_AES)
79
80#include <stdio.h>
81#include <assert.h>
82#include "cryptlib.h"
83#include <openssl/dso.h>
84#include <openssl/engine.h>
85#include <openssl/evp.h>
86#include <openssl/aes.h>
87#include <openssl/err.h>
88
89/* AES-NI is available *ONLY* on some x86 CPUs. Not only that it
90 doesn't exist elsewhere, but it even can't be compiled on other
91 platforms! */
92#undef COMPILE_HW_AESNI
93#if (defined(__x86_64) || defined(__x86_64__) || \
94 defined(_M_AMD64) || defined(_M_X64) || \
95 defined(OPENSSL_IA32_SSE2)) && !defined(OPENSSL_NO_ASM) && !defined(__i386__)
96#define COMPILE_HW_AESNI
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) return;
106 ENGINE_add (toadd);
107 ENGINE_register_complete (toadd);
108 ENGINE_free (toadd);
109 ERR_clear_error ();
110#endif
111}
112
113#ifdef COMPILE_HW_AESNI
114int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
115 AES_KEY *key);
116int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
117 AES_KEY *key);
118
119void aesni_encrypt(const unsigned char *in, unsigned char *out,
120 const AES_KEY *key);
121void aesni_decrypt(const unsigned char *in, unsigned char *out,
122 const AES_KEY *key);
123
124void aesni_ecb_encrypt(const unsigned char *in,
125 unsigned char *out,
126 size_t length,
127 const AES_KEY *key,
128 int enc);
129void aesni_cbc_encrypt(const unsigned char *in,
130 unsigned char *out,
131 size_t length,
132 const AES_KEY *key,
133 unsigned char *ivec, int enc);
134
135/* Function for ENGINE detection and control */
136static int aesni_init(ENGINE *e);
137
138/* Cipher Stuff */
139static int aesni_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
140 const int **nids, int nid);
141
142#define AESNI_MIN_ALIGN 16
143#define AESNI_ALIGN(x) \
144 ((void *)(((unsigned long)(x)+AESNI_MIN_ALIGN-1)&~(AESNI_MIN_ALIGN-1)))
145
146/* Engine names */
147static const char aesni_id[] = "aesni",
148 aesni_name[] = "Intel AES-NI engine",
149 no_aesni_name[] = "Intel AES-NI engine (no-aesni)";
150
151
152/* The input and output encrypted as though 128bit cfb mode is being
153 * used. The extra state information to record how much of the
154 * 128bit block we have used is contained in *num;
155 */
156static void aesni_cfb128_encrypt(const unsigned char *in, unsigned char *out,
157 unsigned int len, const void *key,
158 unsigned char ivec[16], int *num,
159 int enc)
160{
161 unsigned int n;
162 size_t l = 0;
163
164 assert(in && out && key && ivec && num);
165
166 n = *num;
167
168 if (enc) {
169#if !defined(OPENSSL_SMALL_FOOTPRINT)
170 if (16%sizeof(size_t) == 0) do { /* always true actually */
171 while (n && len) {
172 *(out++) = ivec[n] ^= *(in++);
173 --len;
174 n = (n+1) % 16;
175 }
176 while (len>=16) {
177 aesni_encrypt(ivec, ivec, key);
178 for (n=0; n<16; n+=sizeof(size_t)) {
179 *(size_t*)(out+n) =
180 *(size_t*)(ivec+n) ^= *(size_t*)(in+n);
181 }
182 len -= 16;
183 out += 16;
184 in += 16;
185 }
186 n = 0;
187 if (len) {
188 aesni_encrypt(ivec, ivec, key);
189 while (len--) {
190 out[n] = ivec[n] ^= in[n];
191 ++n;
192 }
193 }
194 *num = n;
195 return;
196 } while (0);
197 /* the rest would be commonly eliminated by x86* compiler */
198#endif
199 while (l<len) {
200 if (n == 0) {
201 aesni_encrypt(ivec, ivec, key);
202 }
203 out[l] = ivec[n] ^= in[l];
204 ++l;
205 n = (n+1) % 16;
206 }
207 *num = n;
208 } else {
209#if !defined(OPENSSL_SMALL_FOOTPRINT)
210 if (16%sizeof(size_t) == 0) do { /* always true actually */
211 while (n && len) {
212 unsigned char c;
213 *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c;
214 --len;
215 n = (n+1) % 16;
216 }
217 while (len>=16) {
218 aesni_encrypt(ivec, ivec, key);
219 for (n=0; n<16; n+=sizeof(size_t)) {
220 size_t t = *(size_t*)(in+n);
221 *(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t;
222 *(size_t*)(ivec+n) = t;
223 }
224 len -= 16;
225 out += 16;
226 in += 16;
227 }
228 n = 0;
229 if (len) {
230 aesni_encrypt(ivec, ivec, key);
231 while (len--) {
232 unsigned char c;
233 out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c;
234 ++n;
235 }
236 }
237 *num = n;
238 return;
239 } while (0);
240 /* the rest would be commonly eliminated by x86* compiler */
241#endif
242 while (l<len) {
243 unsigned char c;
244 if (n == 0) {
245 aesni_encrypt(ivec, ivec, key);
246 }
247 out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
248 ++l;
249 n = (n+1) % 16;
250 }
251 *num=n;
252 }
253}
254
255/* The input and output encrypted as though 128bit ofb mode is being
256 * used. The extra state information to record how much of the
257 * 128bit block we have used is contained in *num;
258 */
259static void aesni_ofb128_encrypt(const unsigned char *in, unsigned char *out,
260 unsigned int len, const void *key,
261 unsigned char ivec[16], int *num)
262{
263 unsigned int n;
264 size_t l=0;
265
266 assert(in && out && key && ivec && num);
267
268 n = *num;
269
270#if !defined(OPENSSL_SMALL_FOOTPRINT)
271 if (16%sizeof(size_t) == 0) do { /* always true actually */
272 while (n && len) {
273 *(out++) = *(in++) ^ ivec[n];
274 --len;
275 n = (n+1) % 16;
276 }
277 while (len>=16) {
278 aesni_encrypt(ivec, ivec, key);
279 for (n=0; n<16; n+=sizeof(size_t))
280 *(size_t*)(out+n) =
281 *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
282 len -= 16;
283 out += 16;
284 in += 16;
285 }
286 n = 0;
287 if (len) {
288 aesni_encrypt(ivec, ivec, key);
289 while (len--) {
290 out[n] = in[n] ^ ivec[n];
291 ++n;
292 }
293 }
294 *num = n;
295 return;
296 } while(0);
297 /* the rest would be commonly eliminated by x86* compiler */
298#endif
299 while (l<len) {
300 if (n==0) {
301 aesni_encrypt(ivec, ivec, key);
302 }
303 out[l] = in[l] ^ ivec[n];
304 ++l;
305 n = (n+1) % 16;
306 }
307
308 *num=n;
309}
310/* ===== Engine "management" functions ===== */
311
312#if defined(_WIN32)
313typedef unsigned __int64 IA32CAP;
314#else
315typedef unsigned long long IA32CAP;
316#endif
317
318/* Prepare the ENGINE structure for registration */
319static int
320aesni_bind_helper(ENGINE *e)
321{
322 int engage;
323 if (sizeof(OPENSSL_ia32cap_P) > 4) {
324 engage = ((IA32CAP)OPENSSL_ia32cap_P >> 57) & 1;
325 } else {
326 IA32CAP OPENSSL_ia32_cpuid(void);
327 engage = (OPENSSL_ia32_cpuid() >> 57) & 1;
328 }
329
330 /* Register everything or return with an error */
331 if (!ENGINE_set_id(e, aesni_id) ||
332 !ENGINE_set_name(e, engage ? aesni_name : no_aesni_name) ||
333
334 !ENGINE_set_init_function(e, aesni_init) ||
335 (engage && !ENGINE_set_ciphers (e, aesni_ciphers))
336 )
337 return 0;
338
339 /* Everything looks good */
340 return 1;
341}
342
343/* Constructor */
344static ENGINE *
345ENGINE_aesni(void)
346{
347 ENGINE *eng = ENGINE_new();
348
349 if (!eng) {
350 return NULL;
351 }
352
353 if (!aesni_bind_helper(eng)) {
354 ENGINE_free(eng);
355 return NULL;
356 }
357
358 return eng;
359}
360
361/* Check availability of the engine */
362static int
363aesni_init(ENGINE *e)
364{
365 return 1;
366}
367
368#if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
369#define NID_aes_128_cfb NID_aes_128_cfb128
370#endif
371
372#if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
373#define NID_aes_128_ofb NID_aes_128_ofb128
374#endif
375
376#if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
377#define NID_aes_192_cfb NID_aes_192_cfb128
378#endif
379
380#if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
381#define NID_aes_192_ofb NID_aes_192_ofb128
382#endif
383
384#if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
385#define NID_aes_256_cfb NID_aes_256_cfb128
386#endif
387
388#if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
389#define NID_aes_256_ofb NID_aes_256_ofb128
390#endif
391
392/* List of supported ciphers. */
393static int aesni_cipher_nids[] = {
394 NID_aes_128_ecb,
395 NID_aes_128_cbc,
396 NID_aes_128_cfb,
397 NID_aes_128_ofb,
398
399 NID_aes_192_ecb,
400 NID_aes_192_cbc,
401 NID_aes_192_cfb,
402 NID_aes_192_ofb,
403
404 NID_aes_256_ecb,
405 NID_aes_256_cbc,
406 NID_aes_256_cfb,
407 NID_aes_256_ofb,
408};
409static int aesni_cipher_nids_num =
410 (sizeof(aesni_cipher_nids)/sizeof(aesni_cipher_nids[0]));
411
412typedef struct
413{
414 AES_KEY ks;
415 unsigned int _pad1[3];
416} AESNI_KEY;
417
418static int
419aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *user_key,
420 const unsigned char *iv, int enc)
421{
422 int ret;
423 AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
424
425 if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE
426 || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE
427 || enc)
428 ret=aesni_set_encrypt_key(user_key, ctx->key_len * 8, key);
429 else
430 ret=aesni_set_decrypt_key(user_key, ctx->key_len * 8, key);
431
432 if(ret < 0) {
433 EVPerr(EVP_F_AESNI_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
434 return 0;
435 }
436
437 return 1;
438}
439
440static int aesni_cipher_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
441 const unsigned char *in, size_t inl)
442{ AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
443 aesni_ecb_encrypt(in, out, inl, key, ctx->encrypt);
444 return 1;
445}
446static int aesni_cipher_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
447 const unsigned char *in, size_t inl)
448{ AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
449 aesni_cbc_encrypt(in, out, inl, key,
450 ctx->iv, ctx->encrypt);
451 return 1;
452}
453static int aesni_cipher_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
454 const unsigned char *in, size_t inl)
455{ AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
456
457 aesni_cfb128_encrypt(in, out, inl, key, ctx->iv,
458 &ctx->num, ctx->encrypt);
459 return 1;
460}
461static int aesni_cipher_ofb(EVP_CIPHER_CTX *ctx, unsigned char *out,
462 const unsigned char *in, size_t inl)
463{ AES_KEY *key = AESNI_ALIGN(ctx->cipher_data);
464 aesni_ofb128_encrypt(in, out, inl, key, ctx->iv, &ctx->num);
465 return 1;
466}
467
468#define AES_BLOCK_SIZE 16
469
470#define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
471#define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
472#define EVP_CIPHER_block_size_OFB 1
473#define EVP_CIPHER_block_size_CFB 1
474
475/* Declaring so many ciphers by hand would be a pain.
476 Instead introduce a bit of preprocessor magic :-) */
477#define DECLARE_AES_EVP(ksize,lmode,umode) \
478static const EVP_CIPHER aesni_##ksize##_##lmode = { \
479 NID_aes_##ksize##_##lmode, \
480 EVP_CIPHER_block_size_##umode, \
481 ksize / 8, \
482 AES_BLOCK_SIZE, \
483 0 | EVP_CIPH_##umode##_MODE, \
484 aesni_init_key, \
485 aesni_cipher_##lmode, \
486 NULL, \
487 sizeof(AESNI_KEY), \
488 EVP_CIPHER_set_asn1_iv, \
489 EVP_CIPHER_get_asn1_iv, \
490 NULL, \
491 NULL \
492}
493
494DECLARE_AES_EVP(128,ecb,ECB);
495DECLARE_AES_EVP(128,cbc,CBC);
496DECLARE_AES_EVP(128,cfb,CFB);
497DECLARE_AES_EVP(128,ofb,OFB);
498
499DECLARE_AES_EVP(192,ecb,ECB);
500DECLARE_AES_EVP(192,cbc,CBC);
501DECLARE_AES_EVP(192,cfb,CFB);
502DECLARE_AES_EVP(192,ofb,OFB);
503
504DECLARE_AES_EVP(256,ecb,ECB);
505DECLARE_AES_EVP(256,cbc,CBC);
506DECLARE_AES_EVP(256,cfb,CFB);
507DECLARE_AES_EVP(256,ofb,OFB);
508
509static int
510aesni_ciphers (ENGINE *e, const EVP_CIPHER **cipher,
511 const int **nids, int nid)
512{
513 /* No specific cipher => return a list of supported nids ... */
514 if (!cipher) {
515 *nids = aesni_cipher_nids;
516 return aesni_cipher_nids_num;
517 }
518
519 /* ... or the requested "cipher" otherwise */
520 switch (nid) {
521 case NID_aes_128_ecb:
522 *cipher = &aesni_128_ecb;
523 break;
524 case NID_aes_128_cbc:
525 *cipher = &aesni_128_cbc;
526 break;
527 case NID_aes_128_cfb:
528 *cipher = &aesni_128_cfb;
529 break;
530 case NID_aes_128_ofb:
531 *cipher = &aesni_128_ofb;
532 break;
533
534 case NID_aes_192_ecb:
535 *cipher = &aesni_192_ecb;
536 break;
537 case NID_aes_192_cbc:
538 *cipher = &aesni_192_cbc;
539 break;
540 case NID_aes_192_cfb:
541 *cipher = &aesni_192_cfb;
542 break;
543 case NID_aes_192_ofb:
544 *cipher = &aesni_192_ofb;
545 break;
546
547 case NID_aes_256_ecb:
548 *cipher = &aesni_256_ecb;
549 break;
550 case NID_aes_256_cbc:
551 *cipher = &aesni_256_cbc;
552 break;
553 case NID_aes_256_cfb:
554 *cipher = &aesni_256_cfb;
555 break;
556 case NID_aes_256_ofb:
557 *cipher = &aesni_256_ofb;
558 break;
559
560 default:
561 /* Sorry, we don't support this NID */
562 *cipher = NULL;
563 return 0;
564 }
565 return 1;
566}
567
568#endif /* COMPILE_HW_AESNI */
569#endif /* !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_AESNI) && !defined(OPENSSL_NO_AES) */
570
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