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xen: cleancache shim to Xen Transcendent Memory
[linux-2.6/next.git] / arch / x86 / crypto / aesni-intel_glue.c
blob2577613fb32b04ea65893f5a838bac0f4b317496
1 /*
2 * Support for Intel AES-NI instructions. This file contains glue
3 * code, the real AES implementation is in intel-aes_asm.S.
4 *
5 * Copyright (C) 2008, Intel Corp.
6 * Author: Huang Ying <ying.huang@intel.com>
7 *
8 * Added RFC4106 AES-GCM support for 128-bit keys under the AEAD
9 * interface for 64-bit kernels.
10 * Authors: Adrian Hoban <adrian.hoban@intel.com>
11 * Gabriele Paoloni <gabriele.paoloni@intel.com>
12 * Tadeusz Struk (tadeusz.struk@intel.com)
13 * Aidan O'Mahony (aidan.o.mahony@intel.com)
14 * Copyright (c) 2010, Intel Corporation.
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 */
21
22 #include <linux/hardirq.h>
23 #include <linux/types.h>
24 #include <linux/crypto.h>
25 #include <linux/err.h>
26 #include <crypto/algapi.h>
27 #include <crypto/aes.h>
28 #include <crypto/cryptd.h>
29 #include <crypto/ctr.h>
30 #include <asm/i387.h>
31 #include <asm/aes.h>
32 #include <crypto/scatterwalk.h>
33 #include <crypto/internal/aead.h>
34 #include <linux/workqueue.h>
35 #include <linux/spinlock.h>
36
37 #if defined(CONFIG_CRYPTO_CTR) || defined(CONFIG_CRYPTO_CTR_MODULE)
38 #define HAS_CTR
39 #endif
40
41 #if defined(CONFIG_CRYPTO_LRW) || defined(CONFIG_CRYPTO_LRW_MODULE)
42 #define HAS_LRW
43 #endif
44
45 #if defined(CONFIG_CRYPTO_PCBC) || defined(CONFIG_CRYPTO_PCBC_MODULE)
46 #define HAS_PCBC
47 #endif
48
49 #if defined(CONFIG_CRYPTO_XTS) || defined(CONFIG_CRYPTO_XTS_MODULE)
50 #define HAS_XTS
51 #endif
52
53 struct async_aes_ctx {
54 struct cryptd_ablkcipher *cryptd_tfm;
55 };
56
57 /* This data is stored at the end of the crypto_tfm struct.
58 * It's a type of per "session" data storage location.
59 * This needs to be 16 byte aligned.
60 */
61 struct aesni_rfc4106_gcm_ctx {
62 u8 hash_subkey[16];
63 struct crypto_aes_ctx aes_key_expanded;
64 u8 nonce[4];
65 struct cryptd_aead *cryptd_tfm;
66 };
67
68 struct aesni_gcm_set_hash_subkey_result {
69 int err;
70 struct completion completion;
71 };
72
73 struct aesni_hash_subkey_req_data {
74 u8 iv[16];
75 struct aesni_gcm_set_hash_subkey_result result;
76 struct scatterlist sg;
77 };
78
79 #define AESNI_ALIGN (16)
80 #define AES_BLOCK_MASK (~(AES_BLOCK_SIZE-1))
81 #define RFC4106_HASH_SUBKEY_SIZE 16
82
83 asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
84 unsigned int key_len);
85 asmlinkage void aesni_enc(struct crypto_aes_ctx *ctx, u8 *out,
86 const u8 *in);
87 asmlinkage void aesni_dec(struct crypto_aes_ctx *ctx, u8 *out,
88 const u8 *in);
89 asmlinkage void aesni_ecb_enc(struct crypto_aes_ctx *ctx, u8 *out,
90 const u8 *in, unsigned int len);
91 asmlinkage void aesni_ecb_dec(struct crypto_aes_ctx *ctx, u8 *out,
92 const u8 *in, unsigned int len);
93 asmlinkage void aesni_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out,
94 const u8 *in, unsigned int len, u8 *iv);
95 asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
96 const u8 *in, unsigned int len, u8 *iv);
97 #ifdef CONFIG_X86_64
98 asmlinkage void aesni_ctr_enc(struct crypto_aes_ctx *ctx, u8 *out,
99 const u8 *in, unsigned int len, u8 *iv);
100
101 /* asmlinkage void aesni_gcm_enc()
102 * void *ctx, AES Key schedule. Starts on a 16 byte boundary.
103 * u8 *out, Ciphertext output. Encrypt in-place is allowed.
104 * const u8 *in, Plaintext input
105 * unsigned long plaintext_len, Length of data in bytes for encryption.
106 * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association)
107 * concatenated with 8 byte Initialisation Vector (from IPSec ESP
108 * Payload) concatenated with 0x00000001. 16-byte aligned pointer.
109 * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary.
110 * const u8 *aad, Additional Authentication Data (AAD)
111 * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this
112 * is going to be 8 or 12 bytes
113 * u8 *auth_tag, Authenticated Tag output.
114 * unsigned long auth_tag_len), Authenticated Tag Length in bytes.
115 * Valid values are 16 (most likely), 12 or 8.
116 */
117 asmlinkage void aesni_gcm_enc(void *ctx, u8 *out,
118 const u8 *in, unsigned long plaintext_len, u8 *iv,
119 u8 *hash_subkey, const u8 *aad, unsigned long aad_len,
120 u8 *auth_tag, unsigned long auth_tag_len);
121
122 /* asmlinkage void aesni_gcm_dec()
123 * void *ctx, AES Key schedule. Starts on a 16 byte boundary.
124 * u8 *out, Plaintext output. Decrypt in-place is allowed.
125 * const u8 *in, Ciphertext input
126 * unsigned long ciphertext_len, Length of data in bytes for decryption.
127 * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association)
128 * concatenated with 8 byte Initialisation Vector (from IPSec ESP
129 * Payload) concatenated with 0x00000001. 16-byte aligned pointer.
130 * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary.
131 * const u8 *aad, Additional Authentication Data (AAD)
132 * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this is going
133 * to be 8 or 12 bytes
134 * u8 *auth_tag, Authenticated Tag output.
135 * unsigned long auth_tag_len) Authenticated Tag Length in bytes.
136 * Valid values are 16 (most likely), 12 or 8.
137 */
138 asmlinkage void aesni_gcm_dec(void *ctx, u8 *out,
139 const u8 *in, unsigned long ciphertext_len, u8 *iv,
140 u8 *hash_subkey, const u8 *aad, unsigned long aad_len,
141 u8 *auth_tag, unsigned long auth_tag_len);
142
143 static inline struct
144 aesni_rfc4106_gcm_ctx *aesni_rfc4106_gcm_ctx_get(struct crypto_aead *tfm)
145 {
146 return
147 (struct aesni_rfc4106_gcm_ctx *)
148 PTR_ALIGN((u8 *)
149 crypto_tfm_ctx(crypto_aead_tfm(tfm)), AESNI_ALIGN);
150 }
151 #endif
152
153 static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
154 {
155 unsigned long addr = (unsigned long)raw_ctx;
156 unsigned long align = AESNI_ALIGN;
157
158 if (align <= crypto_tfm_ctx_alignment())
159 align = 1;
160 return (struct crypto_aes_ctx *)ALIGN(addr, align);
161 }
162
163 static int aes_set_key_common(struct crypto_tfm *tfm, void *raw_ctx,
164 const u8 *in_key, unsigned int key_len)
165 {
166 struct crypto_aes_ctx *ctx = aes_ctx(raw_ctx);
167 u32 *flags = &tfm->crt_flags;
168 int err;
169
170 if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&
171 key_len != AES_KEYSIZE_256) {
172 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
173 return -EINVAL;
174 }
175
176 if (!irq_fpu_usable())
177 err = crypto_aes_expand_key(ctx, in_key, key_len);
178 else {
179 kernel_fpu_begin();
180 err = aesni_set_key(ctx, in_key, key_len);
181 kernel_fpu_end();
182 }
183
184 return err;
185 }
186
187 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
188 unsigned int key_len)
189 {
190 return aes_set_key_common(tfm, crypto_tfm_ctx(tfm), in_key, key_len);
191 }
192
193 static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
194 {
195 struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
196
197 if (!irq_fpu_usable())
198 crypto_aes_encrypt_x86(ctx, dst, src);
199 else {
200 kernel_fpu_begin();
201 aesni_enc(ctx, dst, src);
202 kernel_fpu_end();
203 }
204 }
205
206 static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
207 {
208 struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
209
210 if (!irq_fpu_usable())
211 crypto_aes_decrypt_x86(ctx, dst, src);
212 else {
213 kernel_fpu_begin();
214 aesni_dec(ctx, dst, src);
215 kernel_fpu_end();
216 }
217 }
218
219 static struct crypto_alg aesni_alg = {
220 .cra_name = "aes",
221 .cra_driver_name = "aes-aesni",
222 .cra_priority = 300,
223 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
224 .cra_blocksize = AES_BLOCK_SIZE,
225 .cra_ctxsize = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
226 .cra_alignmask = 0,
227 .cra_module = THIS_MODULE,
228 .cra_list = LIST_HEAD_INIT(aesni_alg.cra_list),
229 .cra_u = {
230 .cipher = {
231 .cia_min_keysize = AES_MIN_KEY_SIZE,
232 .cia_max_keysize = AES_MAX_KEY_SIZE,
233 .cia_setkey = aes_set_key,
234 .cia_encrypt = aes_encrypt,
235 .cia_decrypt = aes_decrypt
236 }
237 }
238 };
239
240 static void __aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
241 {
242 struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
243
244 aesni_enc(ctx, dst, src);
245 }
246
247 static void __aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
248 {
249 struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));
250
251 aesni_dec(ctx, dst, src);
252 }
253
254 static struct crypto_alg __aesni_alg = {
255 .cra_name = "__aes-aesni",
256 .cra_driver_name = "__driver-aes-aesni",
257 .cra_priority = 0,
258 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
259 .cra_blocksize = AES_BLOCK_SIZE,
260 .cra_ctxsize = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
261 .cra_alignmask = 0,
262 .cra_module = THIS_MODULE,
263 .cra_list = LIST_HEAD_INIT(__aesni_alg.cra_list),
264 .cra_u = {
265 .cipher = {
266 .cia_min_keysize = AES_MIN_KEY_SIZE,
267 .cia_max_keysize = AES_MAX_KEY_SIZE,
268 .cia_setkey = aes_set_key,
269 .cia_encrypt = __aes_encrypt,
270 .cia_decrypt = __aes_decrypt
271 }
272 }
273 };
274
275 static int ecb_encrypt(struct blkcipher_desc *desc,
276 struct scatterlist *dst, struct scatterlist *src,
277 unsigned int nbytes)
278 {
279 struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
280 struct blkcipher_walk walk;
281 int err;
282
283 blkcipher_walk_init(&walk, dst, src, nbytes);
284 err = blkcipher_walk_virt(desc, &walk);
285 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
286
287 kernel_fpu_begin();
288 while ((nbytes = walk.nbytes)) {
289 aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
290 nbytes & AES_BLOCK_MASK);
291 nbytes &= AES_BLOCK_SIZE - 1;
292 err = blkcipher_walk_done(desc, &walk, nbytes);
293 }
294 kernel_fpu_end();
295
296 return err;
297 }
298
299 static int ecb_decrypt(struct blkcipher_desc *desc,
300 struct scatterlist *dst, struct scatterlist *src,
301 unsigned int nbytes)
302 {
303 struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
304 struct blkcipher_walk walk;
305 int err;
306
307 blkcipher_walk_init(&walk, dst, src, nbytes);
308 err = blkcipher_walk_virt(desc, &walk);
309 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
310
311 kernel_fpu_begin();
312 while ((nbytes = walk.nbytes)) {
313 aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
314 nbytes & AES_BLOCK_MASK);
315 nbytes &= AES_BLOCK_SIZE - 1;
316 err = blkcipher_walk_done(desc, &walk, nbytes);
317 }
318 kernel_fpu_end();
319
320 return err;
321 }
322
323 static struct crypto_alg blk_ecb_alg = {
324 .cra_name = "__ecb-aes-aesni",
325 .cra_driver_name = "__driver-ecb-aes-aesni",
326 .cra_priority = 0,
327 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
328 .cra_blocksize = AES_BLOCK_SIZE,
329 .cra_ctxsize = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
330 .cra_alignmask = 0,
331 .cra_type = &crypto_blkcipher_type,
332 .cra_module = THIS_MODULE,
333 .cra_list = LIST_HEAD_INIT(blk_ecb_alg.cra_list),
334 .cra_u = {
335 .blkcipher = {
336 .min_keysize = AES_MIN_KEY_SIZE,
337 .max_keysize = AES_MAX_KEY_SIZE,
338 .setkey = aes_set_key,
339 .encrypt = ecb_encrypt,
340 .decrypt = ecb_decrypt,
341 },
342 },
343 };
344
345 static int cbc_encrypt(struct blkcipher_desc *desc,
346 struct scatterlist *dst, struct scatterlist *src,
347 unsigned int nbytes)
348 {
349 struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
350 struct blkcipher_walk walk;
351 int err;
352
353 blkcipher_walk_init(&walk, dst, src, nbytes);
354 err = blkcipher_walk_virt(desc, &walk);
355 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
356
357 kernel_fpu_begin();
358 while ((nbytes = walk.nbytes)) {
359 aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
360 nbytes & AES_BLOCK_MASK, walk.iv);
361 nbytes &= AES_BLOCK_SIZE - 1;
362 err = blkcipher_walk_done(desc, &walk, nbytes);
363 }
364 kernel_fpu_end();
365
366 return err;
367 }
368
369 static int cbc_decrypt(struct blkcipher_desc *desc,
370 struct scatterlist *dst, struct scatterlist *src,
371 unsigned int nbytes)
372 {
373 struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
374 struct blkcipher_walk walk;
375 int err;
376
377 blkcipher_walk_init(&walk, dst, src, nbytes);
378 err = blkcipher_walk_virt(desc, &walk);
379 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
380
381 kernel_fpu_begin();
382 while ((nbytes = walk.nbytes)) {
383 aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
384 nbytes & AES_BLOCK_MASK, walk.iv);
385 nbytes &= AES_BLOCK_SIZE - 1;
386 err = blkcipher_walk_done(desc, &walk, nbytes);
387 }
388 kernel_fpu_end();
389
390 return err;
391 }
392
393 static struct crypto_alg blk_cbc_alg = {
394 .cra_name = "__cbc-aes-aesni",
395 .cra_driver_name = "__driver-cbc-aes-aesni",
396 .cra_priority = 0,
397 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
398 .cra_blocksize = AES_BLOCK_SIZE,
399 .cra_ctxsize = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
400 .cra_alignmask = 0,
401 .cra_type = &crypto_blkcipher_type,
402 .cra_module = THIS_MODULE,
403 .cra_list = LIST_HEAD_INIT(blk_cbc_alg.cra_list),
404 .cra_u = {
405 .blkcipher = {
406 .min_keysize = AES_MIN_KEY_SIZE,
407 .max_keysize = AES_MAX_KEY_SIZE,
408 .setkey = aes_set_key,
409 .encrypt = cbc_encrypt,
410 .decrypt = cbc_decrypt,
411 },
412 },
413 };
414
415 #ifdef CONFIG_X86_64
416 static void ctr_crypt_final(struct crypto_aes_ctx *ctx,
417 struct blkcipher_walk *walk)
418 {
419 u8 *ctrblk = walk->iv;
420 u8 keystream[AES_BLOCK_SIZE];
421 u8 *src = walk->src.virt.addr;
422 u8 *dst = walk->dst.virt.addr;
423 unsigned int nbytes = walk->nbytes;
424
425 aesni_enc(ctx, keystream, ctrblk);
426 crypto_xor(keystream, src, nbytes);
427 memcpy(dst, keystream, nbytes);
428 crypto_inc(ctrblk, AES_BLOCK_SIZE);
429 }
430
431 static int ctr_crypt(struct blkcipher_desc *desc,
432 struct scatterlist *dst, struct scatterlist *src,
433 unsigned int nbytes)
434 {
435 struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
436 struct blkcipher_walk walk;
437 int err;
438
439 blkcipher_walk_init(&walk, dst, src, nbytes);
440 err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
441 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
442
443 kernel_fpu_begin();
444 while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
445 aesni_ctr_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
446 nbytes & AES_BLOCK_MASK, walk.iv);
447 nbytes &= AES_BLOCK_SIZE - 1;
448 err = blkcipher_walk_done(desc, &walk, nbytes);
449 }
450 if (walk.nbytes) {
451 ctr_crypt_final(ctx, &walk);
452 err = blkcipher_walk_done(desc, &walk, 0);
453 }
454 kernel_fpu_end();
455
456 return err;
457 }
458
459 static struct crypto_alg blk_ctr_alg = {
460 .cra_name = "__ctr-aes-aesni",
461 .cra_driver_name = "__driver-ctr-aes-aesni",
462 .cra_priority = 0,
463 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
464 .cra_blocksize = 1,
465 .cra_ctxsize = sizeof(struct crypto_aes_ctx)+AESNI_ALIGN-1,
466 .cra_alignmask = 0,
467 .cra_type = &crypto_blkcipher_type,
468 .cra_module = THIS_MODULE,
469 .cra_list = LIST_HEAD_INIT(blk_ctr_alg.cra_list),
470 .cra_u = {
471 .blkcipher = {
472 .min_keysize = AES_MIN_KEY_SIZE,
473 .max_keysize = AES_MAX_KEY_SIZE,
474 .ivsize = AES_BLOCK_SIZE,
475 .setkey = aes_set_key,
476 .encrypt = ctr_crypt,
477 .decrypt = ctr_crypt,
478 },
479 },
480 };
481 #endif
482
483 static int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
484 unsigned int key_len)
485 {
486 struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
487 struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
488 int err;
489
490 crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
491 crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
492 & CRYPTO_TFM_REQ_MASK);
493 err = crypto_ablkcipher_setkey(child, key, key_len);
494 crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
495 & CRYPTO_TFM_RES_MASK);
496 return err;
497 }
498
499 static int ablk_encrypt(struct ablkcipher_request *req)
500 {
501 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
502 struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
503
504 if (!irq_fpu_usable()) {
505 struct ablkcipher_request *cryptd_req =
506 ablkcipher_request_ctx(req);
507 memcpy(cryptd_req, req, sizeof(*req));
508 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
509 return crypto_ablkcipher_encrypt(cryptd_req);
510 } else {
511 struct blkcipher_desc desc;
512 desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
513 desc.info = req->info;
514 desc.flags = 0;
515 return crypto_blkcipher_crt(desc.tfm)->encrypt(
516 &desc, req->dst, req->src, req->nbytes);
517 }
518 }
519
520 static int ablk_decrypt(struct ablkcipher_request *req)
521 {
522 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
523 struct async_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
524
525 if (!irq_fpu_usable()) {
526 struct ablkcipher_request *cryptd_req =
527 ablkcipher_request_ctx(req);
528 memcpy(cryptd_req, req, sizeof(*req));
529 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
530 return crypto_ablkcipher_decrypt(cryptd_req);
531 } else {
532 struct blkcipher_desc desc;
533 desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
534 desc.info = req->info;
535 desc.flags = 0;
536 return crypto_blkcipher_crt(desc.tfm)->decrypt(
537 &desc, req->dst, req->src, req->nbytes);
538 }
539 }
540
541 static void ablk_exit(struct crypto_tfm *tfm)
542 {
543 struct async_aes_ctx *ctx = crypto_tfm_ctx(tfm);
544
545 cryptd_free_ablkcipher(ctx->cryptd_tfm);
546 }
547
548 static void ablk_init_common(struct crypto_tfm *tfm,
549 struct cryptd_ablkcipher *cryptd_tfm)
550 {
551 struct async_aes_ctx *ctx = crypto_tfm_ctx(tfm);
552
553 ctx->cryptd_tfm = cryptd_tfm;
554 tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
555 crypto_ablkcipher_reqsize(&cryptd_tfm->base);
556 }
557
558 static int ablk_ecb_init(struct crypto_tfm *tfm)
559 {
560 struct cryptd_ablkcipher *cryptd_tfm;
561
562 cryptd_tfm = cryptd_alloc_ablkcipher("__driver-ecb-aes-aesni", 0, 0);
563 if (IS_ERR(cryptd_tfm))
564 return PTR_ERR(cryptd_tfm);
565 ablk_init_common(tfm, cryptd_tfm);
566 return 0;
567 }
568
569 static struct crypto_alg ablk_ecb_alg = {
570 .cra_name = "ecb(aes)",
571 .cra_driver_name = "ecb-aes-aesni",
572 .cra_priority = 400,
573 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
574 .cra_blocksize = AES_BLOCK_SIZE,
575 .cra_ctxsize = sizeof(struct async_aes_ctx),
576 .cra_alignmask = 0,
577 .cra_type = &crypto_ablkcipher_type,
578 .cra_module = THIS_MODULE,
579 .cra_list = LIST_HEAD_INIT(ablk_ecb_alg.cra_list),
580 .cra_init = ablk_ecb_init,
581 .cra_exit = ablk_exit,
582 .cra_u = {
583 .ablkcipher = {
584 .min_keysize = AES_MIN_KEY_SIZE,
585 .max_keysize = AES_MAX_KEY_SIZE,
586 .setkey = ablk_set_key,
587 .encrypt = ablk_encrypt,
588 .decrypt = ablk_decrypt,
589 },
590 },
591 };
592
593 static int ablk_cbc_init(struct crypto_tfm *tfm)
594 {
595 struct cryptd_ablkcipher *cryptd_tfm;
596
597 cryptd_tfm = cryptd_alloc_ablkcipher("__driver-cbc-aes-aesni", 0, 0);
598 if (IS_ERR(cryptd_tfm))
599 return PTR_ERR(cryptd_tfm);
600 ablk_init_common(tfm, cryptd_tfm);
601 return 0;
602 }
603
604 static struct crypto_alg ablk_cbc_alg = {
605 .cra_name = "cbc(aes)",
606 .cra_driver_name = "cbc-aes-aesni",
607 .cra_priority = 400,
608 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
609 .cra_blocksize = AES_BLOCK_SIZE,
610 .cra_ctxsize = sizeof(struct async_aes_ctx),
611 .cra_alignmask = 0,
612 .cra_type = &crypto_ablkcipher_type,
613 .cra_module = THIS_MODULE,
614 .cra_list = LIST_HEAD_INIT(ablk_cbc_alg.cra_list),
615 .cra_init = ablk_cbc_init,
616 .cra_exit = ablk_exit,
617 .cra_u = {
618 .ablkcipher = {
619 .min_keysize = AES_MIN_KEY_SIZE,
620 .max_keysize = AES_MAX_KEY_SIZE,
621 .ivsize = AES_BLOCK_SIZE,
622 .setkey = ablk_set_key,
623 .encrypt = ablk_encrypt,
624 .decrypt = ablk_decrypt,
625 },
626 },
627 };
628
629 #ifdef CONFIG_X86_64
630 static int ablk_ctr_init(struct crypto_tfm *tfm)
631 {
632 struct cryptd_ablkcipher *cryptd_tfm;
633
634 cryptd_tfm = cryptd_alloc_ablkcipher("__driver-ctr-aes-aesni", 0, 0);
635 if (IS_ERR(cryptd_tfm))
636 return PTR_ERR(cryptd_tfm);
637 ablk_init_common(tfm, cryptd_tfm);
638 return 0;
639 }
640
641 static struct crypto_alg ablk_ctr_alg = {
642 .cra_name = "ctr(aes)",
643 .cra_driver_name = "ctr-aes-aesni",
644 .cra_priority = 400,
645 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
646 .cra_blocksize = 1,
647 .cra_ctxsize = sizeof(struct async_aes_ctx),
648 .cra_alignmask = 0,
649 .cra_type = &crypto_ablkcipher_type,
650 .cra_module = THIS_MODULE,
651 .cra_list = LIST_HEAD_INIT(ablk_ctr_alg.cra_list),
652 .cra_init = ablk_ctr_init,
653 .cra_exit = ablk_exit,
654 .cra_u = {
655 .ablkcipher = {
656 .min_keysize = AES_MIN_KEY_SIZE,
657 .max_keysize = AES_MAX_KEY_SIZE,
658 .ivsize = AES_BLOCK_SIZE,
659 .setkey = ablk_set_key,
660 .encrypt = ablk_encrypt,
661 .decrypt = ablk_encrypt,
662 .geniv = "chainiv",
663 },
664 },
665 };
666
667 #ifdef HAS_CTR
668 static int ablk_rfc3686_ctr_init(struct crypto_tfm *tfm)
669 {
670 struct cryptd_ablkcipher *cryptd_tfm;
671
672 cryptd_tfm = cryptd_alloc_ablkcipher(
673 "rfc3686(__driver-ctr-aes-aesni)", 0, 0);
674 if (IS_ERR(cryptd_tfm))
675 return PTR_ERR(cryptd_tfm);
676 ablk_init_common(tfm, cryptd_tfm);
677 return 0;
678 }
679
680 static struct crypto_alg ablk_rfc3686_ctr_alg = {
681 .cra_name = "rfc3686(ctr(aes))",
682 .cra_driver_name = "rfc3686-ctr-aes-aesni",
683 .cra_priority = 400,
684 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
685 .cra_blocksize = 1,
686 .cra_ctxsize = sizeof(struct async_aes_ctx),
687 .cra_alignmask = 0,
688 .cra_type = &crypto_ablkcipher_type,
689 .cra_module = THIS_MODULE,
690 .cra_list = LIST_HEAD_INIT(ablk_rfc3686_ctr_alg.cra_list),
691 .cra_init = ablk_rfc3686_ctr_init,
692 .cra_exit = ablk_exit,
693 .cra_u = {
694 .ablkcipher = {
695 .min_keysize = AES_MIN_KEY_SIZE+CTR_RFC3686_NONCE_SIZE,
696 .max_keysize = AES_MAX_KEY_SIZE+CTR_RFC3686_NONCE_SIZE,
697 .ivsize = CTR_RFC3686_IV_SIZE,
698 .setkey = ablk_set_key,
699 .encrypt = ablk_encrypt,
700 .decrypt = ablk_decrypt,
701 .geniv = "seqiv",
702 },
703 },
704 };
705 #endif
706 #endif
707
708 #ifdef HAS_LRW
709 static int ablk_lrw_init(struct crypto_tfm *tfm)
710 {
711 struct cryptd_ablkcipher *cryptd_tfm;
712
713 cryptd_tfm = cryptd_alloc_ablkcipher("fpu(lrw(__driver-aes-aesni))",
714 0, 0);
715 if (IS_ERR(cryptd_tfm))
716 return PTR_ERR(cryptd_tfm);
717 ablk_init_common(tfm, cryptd_tfm);
718 return 0;
719 }
720
721 static struct crypto_alg ablk_lrw_alg = {
722 .cra_name = "lrw(aes)",
723 .cra_driver_name = "lrw-aes-aesni",
724 .cra_priority = 400,
725 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
726 .cra_blocksize = AES_BLOCK_SIZE,
727 .cra_ctxsize = sizeof(struct async_aes_ctx),
728 .cra_alignmask = 0,
729 .cra_type = &crypto_ablkcipher_type,
730 .cra_module = THIS_MODULE,
731 .cra_list = LIST_HEAD_INIT(ablk_lrw_alg.cra_list),
732 .cra_init = ablk_lrw_init,
733 .cra_exit = ablk_exit,
734 .cra_u = {
735 .ablkcipher = {
736 .min_keysize = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
737 .max_keysize = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
738 .ivsize = AES_BLOCK_SIZE,
739 .setkey = ablk_set_key,
740 .encrypt = ablk_encrypt,
741 .decrypt = ablk_decrypt,
742 },
743 },
744 };
745 #endif
746
747 #ifdef HAS_PCBC
748 static int ablk_pcbc_init(struct crypto_tfm *tfm)
749 {
750 struct cryptd_ablkcipher *cryptd_tfm;
751
752 cryptd_tfm = cryptd_alloc_ablkcipher("fpu(pcbc(__driver-aes-aesni))",
753 0, 0);
754 if (IS_ERR(cryptd_tfm))
755 return PTR_ERR(cryptd_tfm);
756 ablk_init_common(tfm, cryptd_tfm);
757 return 0;
758 }
759
760 static struct crypto_alg ablk_pcbc_alg = {
761 .cra_name = "pcbc(aes)",
762 .cra_driver_name = "pcbc-aes-aesni",
763 .cra_priority = 400,
764 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
765 .cra_blocksize = AES_BLOCK_SIZE,
766 .cra_ctxsize = sizeof(struct async_aes_ctx),
767 .cra_alignmask = 0,
768 .cra_type = &crypto_ablkcipher_type,
769 .cra_module = THIS_MODULE,
770 .cra_list = LIST_HEAD_INIT(ablk_pcbc_alg.cra_list),
771 .cra_init = ablk_pcbc_init,
772 .cra_exit = ablk_exit,
773 .cra_u = {
774 .ablkcipher = {
775 .min_keysize = AES_MIN_KEY_SIZE,
776 .max_keysize = AES_MAX_KEY_SIZE,
777 .ivsize = AES_BLOCK_SIZE,
778 .setkey = ablk_set_key,
779 .encrypt = ablk_encrypt,
780 .decrypt = ablk_decrypt,
781 },
782 },
783 };
784 #endif
785
786 #ifdef HAS_XTS
787 static int ablk_xts_init(struct crypto_tfm *tfm)
788 {
789 struct cryptd_ablkcipher *cryptd_tfm;
790
791 cryptd_tfm = cryptd_alloc_ablkcipher("fpu(xts(__driver-aes-aesni))",
792 0, 0);
793 if (IS_ERR(cryptd_tfm))
794 return PTR_ERR(cryptd_tfm);
795 ablk_init_common(tfm, cryptd_tfm);
796 return 0;
797 }
798
799 static struct crypto_alg ablk_xts_alg = {
800 .cra_name = "xts(aes)",
801 .cra_driver_name = "xts-aes-aesni",
802 .cra_priority = 400,
803 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
804 .cra_blocksize = AES_BLOCK_SIZE,
805 .cra_ctxsize = sizeof(struct async_aes_ctx),
806 .cra_alignmask = 0,
807 .cra_type = &crypto_ablkcipher_type,
808 .cra_module = THIS_MODULE,
809 .cra_list = LIST_HEAD_INIT(ablk_xts_alg.cra_list),
810 .cra_init = ablk_xts_init,
811 .cra_exit = ablk_exit,
812 .cra_u = {
813 .ablkcipher = {
814 .min_keysize = 2 * AES_MIN_KEY_SIZE,
815 .max_keysize = 2 * AES_MAX_KEY_SIZE,
816 .ivsize = AES_BLOCK_SIZE,
817 .setkey = ablk_set_key,
818 .encrypt = ablk_encrypt,
819 .decrypt = ablk_decrypt,
820 },
821 },
822 };
823 #endif
824
825 #ifdef CONFIG_X86_64
826 static int rfc4106_init(struct crypto_tfm *tfm)
827 {
828 struct cryptd_aead *cryptd_tfm;
829 struct aesni_rfc4106_gcm_ctx *ctx = (struct aesni_rfc4106_gcm_ctx *)
830 PTR_ALIGN((u8 *)crypto_tfm_ctx(tfm), AESNI_ALIGN);
831 struct crypto_aead *cryptd_child;
832 struct aesni_rfc4106_gcm_ctx *child_ctx;
833 cryptd_tfm = cryptd_alloc_aead("__driver-gcm-aes-aesni", 0, 0);
834 if (IS_ERR(cryptd_tfm))
835 return PTR_ERR(cryptd_tfm);
836
837 cryptd_child = cryptd_aead_child(cryptd_tfm);
838 child_ctx = aesni_rfc4106_gcm_ctx_get(cryptd_child);
839 memcpy(child_ctx, ctx, sizeof(*ctx));
840 ctx->cryptd_tfm = cryptd_tfm;
841 tfm->crt_aead.reqsize = sizeof(struct aead_request)
842 + crypto_aead_reqsize(&cryptd_tfm->base);
843 return 0;
844 }
845
846 static void rfc4106_exit(struct crypto_tfm *tfm)
847 {
848 struct aesni_rfc4106_gcm_ctx *ctx =
849 (struct aesni_rfc4106_gcm_ctx *)
850 PTR_ALIGN((u8 *)crypto_tfm_ctx(tfm), AESNI_ALIGN);
851 if (!IS_ERR(ctx->cryptd_tfm))
852 cryptd_free_aead(ctx->cryptd_tfm);
853 return;
854 }
855
856 static void
857 rfc4106_set_hash_subkey_done(struct crypto_async_request *req, int err)
858 {
859 struct aesni_gcm_set_hash_subkey_result *result = req->data;
860
861 if (err == -EINPROGRESS)
862 return;
863 result->err = err;
864 complete(&result->completion);
865 }
866
867 static int
868 rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
869 {
870 struct crypto_ablkcipher *ctr_tfm;
871 struct ablkcipher_request *req;
872 int ret = -EINVAL;
873 struct aesni_hash_subkey_req_data *req_data;
874
875 ctr_tfm = crypto_alloc_ablkcipher("ctr(aes)", 0, 0);
876 if (IS_ERR(ctr_tfm))
877 return PTR_ERR(ctr_tfm);
878
879 crypto_ablkcipher_clear_flags(ctr_tfm, ~0);
880
881 ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len);
882 if (ret)
883 goto out_free_ablkcipher;
884
885 ret = -ENOMEM;
886 req = ablkcipher_request_alloc(ctr_tfm, GFP_KERNEL);
887 if (!req)
888 goto out_free_ablkcipher;
889
890 req_data = kmalloc(sizeof(*req_data), GFP_KERNEL);
891 if (!req_data)
892 goto out_free_request;
893
894 memset(req_data->iv, 0, sizeof(req_data->iv));
895
896 /* Clear the data in the hash sub key container to zero.*/
897 /* We want to cipher all zeros to create the hash sub key. */
898 memset(hash_subkey, 0, RFC4106_HASH_SUBKEY_SIZE);
899
900 init_completion(&req_data->result.completion);
901 sg_init_one(&req_data->sg, hash_subkey, RFC4106_HASH_SUBKEY_SIZE);
902 ablkcipher_request_set_tfm(req, ctr_tfm);
903 ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP |
904 CRYPTO_TFM_REQ_MAY_BACKLOG,
905 rfc4106_set_hash_subkey_done,
906 &req_data->result);
907
908 ablkcipher_request_set_crypt(req, &req_data->sg,
909 &req_data->sg, RFC4106_HASH_SUBKEY_SIZE, req_data->iv);
910
911 ret = crypto_ablkcipher_encrypt(req);
912 if (ret == -EINPROGRESS || ret == -EBUSY) {
913 ret = wait_for_completion_interruptible
914 (&req_data->result.completion);
915 if (!ret)
916 ret = req_data->result.err;
917 }
918 kfree(req_data);
919 out_free_request:
920 ablkcipher_request_free(req);
921 out_free_ablkcipher:
922 crypto_free_ablkcipher(ctr_tfm);
923 return ret;
924 }
925
926 static int rfc4106_set_key(struct crypto_aead *parent, const u8 *key,
927 unsigned int key_len)
928 {
929 int ret = 0;
930 struct crypto_tfm *tfm = crypto_aead_tfm(parent);
931 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(parent);
932 struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
933 struct aesni_rfc4106_gcm_ctx *child_ctx =
934 aesni_rfc4106_gcm_ctx_get(cryptd_child);
935 u8 *new_key_mem = NULL;
936
937 if (key_len < 4) {
938 crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
939 return -EINVAL;
940 }
941 /*Account for 4 byte nonce at the end.*/
942 key_len -= 4;
943 if (key_len != AES_KEYSIZE_128) {
944 crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
945 return -EINVAL;
946 }
947
948 memcpy(ctx->nonce, key + key_len, sizeof(ctx->nonce));
949 /*This must be on a 16 byte boundary!*/
950 if ((unsigned long)(&(ctx->aes_key_expanded.key_enc[0])) % AESNI_ALIGN)
951 return -EINVAL;
952
953 if ((unsigned long)key % AESNI_ALIGN) {
954 /*key is not aligned: use an auxuliar aligned pointer*/
955 new_key_mem = kmalloc(key_len+AESNI_ALIGN, GFP_KERNEL);
956 if (!new_key_mem)
957 return -ENOMEM;
958
959 new_key_mem = PTR_ALIGN(new_key_mem, AESNI_ALIGN);
960 memcpy(new_key_mem, key, key_len);
961 key = new_key_mem;
962 }
963
964 if (!irq_fpu_usable())
965 ret = crypto_aes_expand_key(&(ctx->aes_key_expanded),
966 key, key_len);
967 else {
968 kernel_fpu_begin();
969 ret = aesni_set_key(&(ctx->aes_key_expanded), key, key_len);
970 kernel_fpu_end();
971 }
972 /*This must be on a 16 byte boundary!*/
973 if ((unsigned long)(&(ctx->hash_subkey[0])) % AESNI_ALIGN) {
974 ret = -EINVAL;
975 goto exit;
976 }
977 ret = rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len);
978 memcpy(child_ctx, ctx, sizeof(*ctx));
979 exit:
980 kfree(new_key_mem);
981 return ret;
982 }
983
984 /* This is the Integrity Check Value (aka the authentication tag length and can
985 * be 8, 12 or 16 bytes long. */
986 static int rfc4106_set_authsize(struct crypto_aead *parent,
987 unsigned int authsize)
988 {
989 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(parent);
990 struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
991
992 switch (authsize) {
993 case 8:
994 case 12:
995 case 16:
996 break;
997 default:
998 return -EINVAL;
999 }
1000 crypto_aead_crt(parent)->authsize = authsize;
1001 crypto_aead_crt(cryptd_child)->authsize = authsize;
1002 return 0;
1003 }
1004
1005 static int rfc4106_encrypt(struct aead_request *req)
1006 {
1007 int ret;
1008 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1009 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
1010
1011 if (!irq_fpu_usable()) {
1012 struct aead_request *cryptd_req =
1013 (struct aead_request *) aead_request_ctx(req);
1014 memcpy(cryptd_req, req, sizeof(*req));
1015 aead_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
1016 return crypto_aead_encrypt(cryptd_req);
1017 } else {
1018 struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
1019 kernel_fpu_begin();
1020 ret = cryptd_child->base.crt_aead.encrypt(req);
1021 kernel_fpu_end();
1022 return ret;
1023 }
1024 }
1025
1026 static int rfc4106_decrypt(struct aead_request *req)
1027 {
1028 int ret;
1029 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1030 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
1031
1032 if (!irq_fpu_usable()) {
1033 struct aead_request *cryptd_req =
1034 (struct aead_request *) aead_request_ctx(req);
1035 memcpy(cryptd_req, req, sizeof(*req));
1036 aead_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
1037 return crypto_aead_decrypt(cryptd_req);
1038 } else {
1039 struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
1040 kernel_fpu_begin();
1041 ret = cryptd_child->base.crt_aead.decrypt(req);
1042 kernel_fpu_end();
1043 return ret;
1044 }
1045 }
1046
1047 static struct crypto_alg rfc4106_alg = {
1048 .cra_name = "rfc4106(gcm(aes))",
1049 .cra_driver_name = "rfc4106-gcm-aesni",
1050 .cra_priority = 400,
1051 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1052 .cra_blocksize = 1,
1053 .cra_ctxsize = sizeof(struct aesni_rfc4106_gcm_ctx) + AESNI_ALIGN,
1054 .cra_alignmask = 0,
1055 .cra_type = &crypto_nivaead_type,
1056 .cra_module = THIS_MODULE,
1057 .cra_list = LIST_HEAD_INIT(rfc4106_alg.cra_list),
1058 .cra_init = rfc4106_init,
1059 .cra_exit = rfc4106_exit,
1060 .cra_u = {
1061 .aead = {
1062 .setkey = rfc4106_set_key,
1063 .setauthsize = rfc4106_set_authsize,
1064 .encrypt = rfc4106_encrypt,
1065 .decrypt = rfc4106_decrypt,
1066 .geniv = "seqiv",
1067 .ivsize = 8,
1068 .maxauthsize = 16,
1069 },
1070 },
1071 };
1072
1073 static int __driver_rfc4106_encrypt(struct aead_request *req)
1074 {
1075 u8 one_entry_in_sg = 0;
1076 u8 *src, *dst, *assoc;
1077 __be32 counter = cpu_to_be32(1);
1078 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1079 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
1080 void *aes_ctx = &(ctx->aes_key_expanded);
1081 unsigned long auth_tag_len = crypto_aead_authsize(tfm);
1082 u8 iv_tab[16+AESNI_ALIGN];
1083 u8* iv = (u8 *) PTR_ALIGN((u8 *)iv_tab, AESNI_ALIGN);
1084 struct scatter_walk src_sg_walk;
1085 struct scatter_walk assoc_sg_walk;
1086 struct scatter_walk dst_sg_walk;
1087 unsigned int i;
1088
1089 /* Assuming we are supporting rfc4106 64-bit extended */
1090 /* sequence numbers We need to have the AAD length equal */
1091 /* to 8 or 12 bytes */
1092 if (unlikely(req->assoclen != 8 && req->assoclen != 12))
1093 return -EINVAL;
1094 /* IV below built */
1095 for (i = 0; i < 4; i++)
1096 *(iv+i) = ctx->nonce[i];
1097 for (i = 0; i < 8; i++)
1098 *(iv+4+i) = req->iv[i];
1099 *((__be32 *)(iv+12)) = counter;
1100
1101 if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {
1102 one_entry_in_sg = 1;
1103 scatterwalk_start(&src_sg_walk, req->src);
1104 scatterwalk_start(&assoc_sg_walk, req->assoc);
1105 src = scatterwalk_map(&src_sg_walk, 0);
1106 assoc = scatterwalk_map(&assoc_sg_walk, 0);
1107 dst = src;
1108 if (unlikely(req->src != req->dst)) {
1109 scatterwalk_start(&dst_sg_walk, req->dst);
1110 dst = scatterwalk_map(&dst_sg_walk, 0);
1111 }
1112
1113 } else {
1114 /* Allocate memory for src, dst, assoc */
1115 src = kmalloc(req->cryptlen + auth_tag_len + req->assoclen,
1116 GFP_ATOMIC);
1117 if (unlikely(!src))
1118 return -ENOMEM;
1119 assoc = (src + req->cryptlen + auth_tag_len);
1120 scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);
1121 scatterwalk_map_and_copy(assoc, req->assoc, 0,
1122 req->assoclen, 0);
1123 dst = src;
1124 }
1125
1126 aesni_gcm_enc(aes_ctx, dst, src, (unsigned long)req->cryptlen, iv,
1127 ctx->hash_subkey, assoc, (unsigned long)req->assoclen, dst
1128 + ((unsigned long)req->cryptlen), auth_tag_len);
1129
1130 /* The authTag (aka the Integrity Check Value) needs to be written
1131 * back to the packet. */
1132 if (one_entry_in_sg) {
1133 if (unlikely(req->src != req->dst)) {
1134 scatterwalk_unmap(dst, 0);
1135 scatterwalk_done(&dst_sg_walk, 0, 0);
1136 }
1137 scatterwalk_unmap(src, 0);
1138 scatterwalk_unmap(assoc, 0);
1139 scatterwalk_done(&src_sg_walk, 0, 0);
1140 scatterwalk_done(&assoc_sg_walk, 0, 0);
1141 } else {
1142 scatterwalk_map_and_copy(dst, req->dst, 0,
1143 req->cryptlen + auth_tag_len, 1);
1144 kfree(src);
1145 }
1146 return 0;
1147 }
1148
1149 static int __driver_rfc4106_decrypt(struct aead_request *req)
1150 {
1151 u8 one_entry_in_sg = 0;
1152 u8 *src, *dst, *assoc;
1153 unsigned long tempCipherLen = 0;
1154 __be32 counter = cpu_to_be32(1);
1155 int retval = 0;
1156 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1157 struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
1158 void *aes_ctx = &(ctx->aes_key_expanded);
1159 unsigned long auth_tag_len = crypto_aead_authsize(tfm);
1160 u8 iv_and_authTag[32+AESNI_ALIGN];
1161 u8 *iv = (u8 *) PTR_ALIGN((u8 *)iv_and_authTag, AESNI_ALIGN);
1162 u8 *authTag = iv + 16;
1163 struct scatter_walk src_sg_walk;
1164 struct scatter_walk assoc_sg_walk;
1165 struct scatter_walk dst_sg_walk;
1166 unsigned int i;
1167
1168 if (unlikely((req->cryptlen < auth_tag_len) ||
1169 (req->assoclen != 8 && req->assoclen != 12)))
1170 return -EINVAL;
1171 /* Assuming we are supporting rfc4106 64-bit extended */
1172 /* sequence numbers We need to have the AAD length */
1173 /* equal to 8 or 12 bytes */
1174
1175 tempCipherLen = (unsigned long)(req->cryptlen - auth_tag_len);
1176 /* IV below built */
1177 for (i = 0; i < 4; i++)
1178 *(iv+i) = ctx->nonce[i];
1179 for (i = 0; i < 8; i++)
1180 *(iv+4+i) = req->iv[i];
1181 *((__be32 *)(iv+12)) = counter;
1182
1183 if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {
1184 one_entry_in_sg = 1;
1185 scatterwalk_start(&src_sg_walk, req->src);
1186 scatterwalk_start(&assoc_sg_walk, req->assoc);
1187 src = scatterwalk_map(&src_sg_walk, 0);
1188 assoc = scatterwalk_map(&assoc_sg_walk, 0);
1189 dst = src;
1190 if (unlikely(req->src != req->dst)) {
1191 scatterwalk_start(&dst_sg_walk, req->dst);
1192 dst = scatterwalk_map(&dst_sg_walk, 0);
1193 }
1194
1195 } else {
1196 /* Allocate memory for src, dst, assoc */
1197 src = kmalloc(req->cryptlen + req->assoclen, GFP_ATOMIC);
1198 if (!src)
1199 return -ENOMEM;
1200 assoc = (src + req->cryptlen + auth_tag_len);
1201 scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);
1202 scatterwalk_map_and_copy(assoc, req->assoc, 0,
1203 req->assoclen, 0);
1204 dst = src;
1205 }
1206
1207 aesni_gcm_dec(aes_ctx, dst, src, tempCipherLen, iv,
1208 ctx->hash_subkey, assoc, (unsigned long)req->assoclen,
1209 authTag, auth_tag_len);
1210
1211 /* Compare generated tag with passed in tag. */
1212 retval = memcmp(src + tempCipherLen, authTag, auth_tag_len) ?
1213 -EBADMSG : 0;
1214
1215 if (one_entry_in_sg) {
1216 if (unlikely(req->src != req->dst)) {
1217 scatterwalk_unmap(dst, 0);
1218 scatterwalk_done(&dst_sg_walk, 0, 0);
1219 }
1220 scatterwalk_unmap(src, 0);
1221 scatterwalk_unmap(assoc, 0);
1222 scatterwalk_done(&src_sg_walk, 0, 0);
1223 scatterwalk_done(&assoc_sg_walk, 0, 0);
1224 } else {
1225 scatterwalk_map_and_copy(dst, req->dst, 0, req->cryptlen, 1);
1226 kfree(src);
1227 }
1228 return retval;
1229 }
1230
1231 static struct crypto_alg __rfc4106_alg = {
1232 .cra_name = "__gcm-aes-aesni",
1233 .cra_driver_name = "__driver-gcm-aes-aesni",
1234 .cra_priority = 0,
1235 .cra_flags = CRYPTO_ALG_TYPE_AEAD,
1236 .cra_blocksize = 1,
1237 .cra_ctxsize = sizeof(struct aesni_rfc4106_gcm_ctx) + AESNI_ALIGN,
1238 .cra_alignmask = 0,
1239 .cra_type = &crypto_aead_type,
1240 .cra_module = THIS_MODULE,
1241 .cra_list = LIST_HEAD_INIT(__rfc4106_alg.cra_list),
1242 .cra_u = {
1243 .aead = {
1244 .encrypt = __driver_rfc4106_encrypt,
1245 .decrypt = __driver_rfc4106_decrypt,
1246 },
1247 },
1248 };
1249 #endif
1250
1251 static int __init aesni_init(void)
1252 {
1253 int err;
1254
1255 if (!cpu_has_aes) {
1256 printk(KERN_INFO "Intel AES-NI instructions are not detected.\n");
1257 return -ENODEV;
1258 }
1259
1260 if ((err = crypto_register_alg(&aesni_alg)))
1261 goto aes_err;
1262 if ((err = crypto_register_alg(&__aesni_alg)))
1263 goto __aes_err;
1264 if ((err = crypto_register_alg(&blk_ecb_alg)))
1265 goto blk_ecb_err;
1266 if ((err = crypto_register_alg(&blk_cbc_alg)))
1267 goto blk_cbc_err;
1268 if ((err = crypto_register_alg(&ablk_ecb_alg)))
1269 goto ablk_ecb_err;
1270 if ((err = crypto_register_alg(&ablk_cbc_alg)))
1271 goto ablk_cbc_err;
1272 #ifdef CONFIG_X86_64
1273 if ((err = crypto_register_alg(&blk_ctr_alg)))
1274 goto blk_ctr_err;
1275 if ((err = crypto_register_alg(&ablk_ctr_alg)))
1276 goto ablk_ctr_err;
1277 if ((err = crypto_register_alg(&__rfc4106_alg)))
1278 goto __aead_gcm_err;
1279 if ((err = crypto_register_alg(&rfc4106_alg)))
1280 goto aead_gcm_err;
1281 #ifdef HAS_CTR
1282 if ((err = crypto_register_alg(&ablk_rfc3686_ctr_alg)))
1283 goto ablk_rfc3686_ctr_err;
1284 #endif
1285 #endif
1286 #ifdef HAS_LRW
1287 if ((err = crypto_register_alg(&ablk_lrw_alg)))
1288 goto ablk_lrw_err;
1289 #endif
1290 #ifdef HAS_PCBC
1291 if ((err = crypto_register_alg(&ablk_pcbc_alg)))
1292 goto ablk_pcbc_err;
1293 #endif
1294 #ifdef HAS_XTS
1295 if ((err = crypto_register_alg(&ablk_xts_alg)))
1296 goto ablk_xts_err;
1297 #endif
1298 return err;
1299
1300 #ifdef HAS_XTS
1301 ablk_xts_err:
1302 #endif
1303 #ifdef HAS_PCBC
1304 crypto_unregister_alg(&ablk_pcbc_alg);
1305 ablk_pcbc_err:
1306 #endif
1307 #ifdef HAS_LRW
1308 crypto_unregister_alg(&ablk_lrw_alg);
1309 ablk_lrw_err:
1310 #endif
1311 #ifdef CONFIG_X86_64
1312 #ifdef HAS_CTR
1313 crypto_unregister_alg(&ablk_rfc3686_ctr_alg);
1314 ablk_rfc3686_ctr_err:
1315 #endif
1316 crypto_unregister_alg(&rfc4106_alg);
1317 aead_gcm_err:
1318 crypto_unregister_alg(&__rfc4106_alg);
1319 __aead_gcm_err:
1320 crypto_unregister_alg(&ablk_ctr_alg);
1321 ablk_ctr_err:
1322 crypto_unregister_alg(&blk_ctr_alg);
1323 blk_ctr_err:
1324 #endif
1325 crypto_unregister_alg(&ablk_cbc_alg);
1326 ablk_cbc_err:
1327 crypto_unregister_alg(&ablk_ecb_alg);
1328 ablk_ecb_err:
1329 crypto_unregister_alg(&blk_cbc_alg);
1330 blk_cbc_err:
1331 crypto_unregister_alg(&blk_ecb_alg);
1332 blk_ecb_err:
1333 crypto_unregister_alg(&__aesni_alg);
1334 __aes_err:
1335 crypto_unregister_alg(&aesni_alg);
1336 aes_err:
1337 return err;
1338 }
1339
1340 static void __exit aesni_exit(void)
1341 {
1342 #ifdef HAS_XTS
1343 crypto_unregister_alg(&ablk_xts_alg);
1344 #endif
1345 #ifdef HAS_PCBC
1346 crypto_unregister_alg(&ablk_pcbc_alg);
1347 #endif
1348 #ifdef HAS_LRW
1349 crypto_unregister_alg(&ablk_lrw_alg);
1350 #endif
1351 #ifdef CONFIG_X86_64
1352 #ifdef HAS_CTR
1353 crypto_unregister_alg(&ablk_rfc3686_ctr_alg);
1354 #endif
1355 crypto_unregister_alg(&rfc4106_alg);
1356 crypto_unregister_alg(&__rfc4106_alg);
1357 crypto_unregister_alg(&ablk_ctr_alg);
1358 crypto_unregister_alg(&blk_ctr_alg);
1359 #endif
1360 crypto_unregister_alg(&ablk_cbc_alg);
1361 crypto_unregister_alg(&ablk_ecb_alg);
1362 crypto_unregister_alg(&blk_cbc_alg);
1363 crypto_unregister_alg(&blk_ecb_alg);
1364 crypto_unregister_alg(&__aesni_alg);
1365 crypto_unregister_alg(&aesni_alg);
1366 }
1367
1368 module_init(aesni_init);
1369 module_exit(aesni_exit);
1370
1371 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm, Intel AES-NI instructions optimized");
1372 MODULE_LICENSE("GPL");
1373 MODULE_ALIAS("aes");
linux-next