?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: rtl8192u: remove redundant assignment to pointer crypt
[linux/fpc-iii.git] / arch / arm64 / crypto / ghash-ce-glue.c
blob16c5da9be9fb436912cec1a4a1fed669938261a6
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Accelerated GHASH implementation with ARMv8 PMULL instructions.
4 *
5 * Copyright (C) 2014 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
6 */
7
8 #include <asm/neon.h>
9 #include <asm/simd.h>
10 #include <asm/unaligned.h>
11 #include <crypto/aes.h>
12 #include <crypto/algapi.h>
13 #include <crypto/b128ops.h>
14 #include <crypto/gf128mul.h>
15 #include <crypto/internal/aead.h>
16 #include <crypto/internal/hash.h>
17 #include <crypto/internal/simd.h>
18 #include <crypto/internal/skcipher.h>
19 #include <crypto/scatterwalk.h>
20 #include <linux/cpufeature.h>
21 #include <linux/crypto.h>
22 #include <linux/module.h>
23
24 MODULE_DESCRIPTION("GHASH and AES-GCM using ARMv8 Crypto Extensions");
25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
26 MODULE_LICENSE("GPL v2");
27 MODULE_ALIAS_CRYPTO("ghash");
28
29 #define GHASH_BLOCK_SIZE 16
30 #define GHASH_DIGEST_SIZE 16
31 #define GCM_IV_SIZE 12
32
33 struct ghash_key {
34 u64 h[2];
35 u64 h2[2];
36 u64 h3[2];
37 u64 h4[2];
38
39 be128 k;
40 };
41
42 struct ghash_desc_ctx {
43 u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)];
44 u8 buf[GHASH_BLOCK_SIZE];
45 u32 count;
46 };
47
48 struct gcm_aes_ctx {
49 struct crypto_aes_ctx aes_key;
50 struct ghash_key ghash_key;
51 };
52
53 asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src,
54 struct ghash_key const *k,
55 const char *head);
56
57 asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src,
58 struct ghash_key const *k,
59 const char *head);
60
61 asmlinkage void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[],
62 const u8 src[], struct ghash_key const *k,
63 u8 ctr[], u32 const rk[], int rounds,
64 u8 ks[]);
65
66 asmlinkage void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[],
67 const u8 src[], struct ghash_key const *k,
68 u8 ctr[], u32 const rk[], int rounds);
69
70 asmlinkage void pmull_gcm_encrypt_block(u8 dst[], u8 const src[],
71 u32 const rk[], int rounds);
72
73 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
74
75 static int ghash_init(struct shash_desc *desc)
76 {
77 struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
78
79 *ctx = (struct ghash_desc_ctx){};
80 return 0;
81 }
82
83 static void ghash_do_update(int blocks, u64 dg[], const char *src,
84 struct ghash_key *key, const char *head,
85 void (*simd_update)(int blocks, u64 dg[],
86 const char *src,
87 struct ghash_key const *k,
88 const char *head))
89 {
90 if (likely(crypto_simd_usable())) {
91 kernel_neon_begin();
92 simd_update(blocks, dg, src, key, head);
93 kernel_neon_end();
94 } else {
95 be128 dst = { cpu_to_be64(dg[1]), cpu_to_be64(dg[0]) };
96
97 do {
98 const u8 *in = src;
99
100 if (head) {
101 in = head;
102 blocks++;
103 head = NULL;
104 } else {
105 src += GHASH_BLOCK_SIZE;
106 }
107
108 crypto_xor((u8 *)&dst, in, GHASH_BLOCK_SIZE);
109 gf128mul_lle(&dst, &key->k);
110 } while (--blocks);
111
112 dg[0] = be64_to_cpu(dst.b);
113 dg[1] = be64_to_cpu(dst.a);
114 }
115 }
116
117 /* avoid hogging the CPU for too long */
118 #define MAX_BLOCKS (SZ_64K / GHASH_BLOCK_SIZE)
119
120 static int __ghash_update(struct shash_desc *desc, const u8 *src,
121 unsigned int len,
122 void (*simd_update)(int blocks, u64 dg[],
123 const char *src,
124 struct ghash_key const *k,
125 const char *head))
126 {
127 struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
128 unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
129
130 ctx->count += len;
131
132 if ((partial + len) >= GHASH_BLOCK_SIZE) {
133 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
134 int blocks;
135
136 if (partial) {
137 int p = GHASH_BLOCK_SIZE - partial;
138
139 memcpy(ctx->buf + partial, src, p);
140 src += p;
141 len -= p;
142 }
143
144 blocks = len / GHASH_BLOCK_SIZE;
145 len %= GHASH_BLOCK_SIZE;
146
147 do {
148 int chunk = min(blocks, MAX_BLOCKS);
149
150 ghash_do_update(chunk, ctx->digest, src, key,
151 partial ? ctx->buf : NULL,
152 simd_update);
153
154 blocks -= chunk;
155 src += chunk * GHASH_BLOCK_SIZE;
156 partial = 0;
157 } while (unlikely(blocks > 0));
158 }
159 if (len)
160 memcpy(ctx->buf + partial, src, len);
161 return 0;
162 }
163
164 static int ghash_update_p8(struct shash_desc *desc, const u8 *src,
165 unsigned int len)
166 {
167 return __ghash_update(desc, src, len, pmull_ghash_update_p8);
168 }
169
170 static int ghash_update_p64(struct shash_desc *desc, const u8 *src,
171 unsigned int len)
172 {
173 return __ghash_update(desc, src, len, pmull_ghash_update_p64);
174 }
175
176 static int ghash_final_p8(struct shash_desc *desc, u8 *dst)
177 {
178 struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
179 unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
180
181 if (partial) {
182 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
183
184 memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
185
186 ghash_do_update(1, ctx->digest, ctx->buf, key, NULL,
187 pmull_ghash_update_p8);
188 }
189 put_unaligned_be64(ctx->digest[1], dst);
190 put_unaligned_be64(ctx->digest[0], dst + 8);
191
192 *ctx = (struct ghash_desc_ctx){};
193 return 0;
194 }
195
196 static int ghash_final_p64(struct shash_desc *desc, u8 *dst)
197 {
198 struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
199 unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
200
201 if (partial) {
202 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
203
204 memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
205
206 ghash_do_update(1, ctx->digest, ctx->buf, key, NULL,
207 pmull_ghash_update_p64);
208 }
209 put_unaligned_be64(ctx->digest[1], dst);
210 put_unaligned_be64(ctx->digest[0], dst + 8);
211
212 *ctx = (struct ghash_desc_ctx){};
213 return 0;
214 }
215
216 static void ghash_reflect(u64 h[], const be128 *k)
217 {
218 u64 carry = be64_to_cpu(k->a) & BIT(63) ? 1 : 0;
219
220 h[0] = (be64_to_cpu(k->b) << 1) | carry;
221 h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63);
222
223 if (carry)
224 h[1] ^= 0xc200000000000000UL;
225 }
226
227 static int __ghash_setkey(struct ghash_key *key,
228 const u8 *inkey, unsigned int keylen)
229 {
230 be128 h;
231
232 /* needed for the fallback */
233 memcpy(&key->k, inkey, GHASH_BLOCK_SIZE);
234
235 ghash_reflect(key->h, &key->k);
236
237 h = key->k;
238 gf128mul_lle(&h, &key->k);
239 ghash_reflect(key->h2, &h);
240
241 gf128mul_lle(&h, &key->k);
242 ghash_reflect(key->h3, &h);
243
244 gf128mul_lle(&h, &key->k);
245 ghash_reflect(key->h4, &h);
246
247 return 0;
248 }
249
250 static int ghash_setkey(struct crypto_shash *tfm,
251 const u8 *inkey, unsigned int keylen)
252 {
253 struct ghash_key *key = crypto_shash_ctx(tfm);
254
255 if (keylen != GHASH_BLOCK_SIZE) {
256 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
257 return -EINVAL;
258 }
259
260 return __ghash_setkey(key, inkey, keylen);
261 }
262
263 static struct shash_alg ghash_alg[] = {{
264 .base.cra_name = "ghash",
265 .base.cra_driver_name = "ghash-neon",
266 .base.cra_priority = 100,
267 .base.cra_blocksize = GHASH_BLOCK_SIZE,
268 .base.cra_ctxsize = sizeof(struct ghash_key),
269 .base.cra_module = THIS_MODULE,
270
271 .digestsize = GHASH_DIGEST_SIZE,
272 .init = ghash_init,
273 .update = ghash_update_p8,
274 .final = ghash_final_p8,
275 .setkey = ghash_setkey,
276 .descsize = sizeof(struct ghash_desc_ctx),
277 }, {
278 .base.cra_name = "ghash",
279 .base.cra_driver_name = "ghash-ce",
280 .base.cra_priority = 200,
281 .base.cra_blocksize = GHASH_BLOCK_SIZE,
282 .base.cra_ctxsize = sizeof(struct ghash_key),
283 .base.cra_module = THIS_MODULE,
284
285 .digestsize = GHASH_DIGEST_SIZE,
286 .init = ghash_init,
287 .update = ghash_update_p64,
288 .final = ghash_final_p64,
289 .setkey = ghash_setkey,
290 .descsize = sizeof(struct ghash_desc_ctx),
291 }};
292
293 static int num_rounds(struct crypto_aes_ctx *ctx)
294 {
295 /*
296 * # of rounds specified by AES:
297 * 128 bit key 10 rounds
298 * 192 bit key 12 rounds
299 * 256 bit key 14 rounds
300 * => n byte key => 6 + (n/4) rounds
301 */
302 return 6 + ctx->key_length / 4;
303 }
304
305 static int gcm_setkey(struct crypto_aead *tfm, const u8 *inkey,
306 unsigned int keylen)
307 {
308 struct gcm_aes_ctx *ctx = crypto_aead_ctx(tfm);
309 u8 key[GHASH_BLOCK_SIZE];
310 int ret;
311
312 ret = crypto_aes_expand_key(&ctx->aes_key, inkey, keylen);
313 if (ret) {
314 tfm->base.crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
315 return -EINVAL;
316 }
317
318 __aes_arm64_encrypt(ctx->aes_key.key_enc, key, (u8[AES_BLOCK_SIZE]){},
319 num_rounds(&ctx->aes_key));
320
321 return __ghash_setkey(&ctx->ghash_key, key, sizeof(be128));
322 }
323
324 static int gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
325 {
326 switch (authsize) {
327 case 4:
328 case 8:
329 case 12 ... 16:
330 break;
331 default:
332 return -EINVAL;
333 }
334 return 0;
335 }
336
337 static void gcm_update_mac(u64 dg[], const u8 *src, int count, u8 buf[],
338 int *buf_count, struct gcm_aes_ctx *ctx)
339 {
340 if (*buf_count > 0) {
341 int buf_added = min(count, GHASH_BLOCK_SIZE - *buf_count);
342
343 memcpy(&buf[*buf_count], src, buf_added);
344
345 *buf_count += buf_added;
346 src += buf_added;
347 count -= buf_added;
348 }
349
350 if (count >= GHASH_BLOCK_SIZE || *buf_count == GHASH_BLOCK_SIZE) {
351 int blocks = count / GHASH_BLOCK_SIZE;
352
353 ghash_do_update(blocks, dg, src, &ctx->ghash_key,
354 *buf_count ? buf : NULL,
355 pmull_ghash_update_p64);
356
357 src += blocks * GHASH_BLOCK_SIZE;
358 count %= GHASH_BLOCK_SIZE;
359 *buf_count = 0;
360 }
361
362 if (count > 0) {
363 memcpy(buf, src, count);
364 *buf_count = count;
365 }
366 }
367
368 static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[])
369 {
370 struct crypto_aead *aead = crypto_aead_reqtfm(req);
371 struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
372 u8 buf[GHASH_BLOCK_SIZE];
373 struct scatter_walk walk;
374 u32 len = req->assoclen;
375 int buf_count = 0;
376
377 scatterwalk_start(&walk, req->src);
378
379 do {
380 u32 n = scatterwalk_clamp(&walk, len);
381 u8 *p;
382
383 if (!n) {
384 scatterwalk_start(&walk, sg_next(walk.sg));
385 n = scatterwalk_clamp(&walk, len);
386 }
387 p = scatterwalk_map(&walk);
388
389 gcm_update_mac(dg, p, n, buf, &buf_count, ctx);
390 len -= n;
391
392 scatterwalk_unmap(p);
393 scatterwalk_advance(&walk, n);
394 scatterwalk_done(&walk, 0, len);
395 } while (len);
396
397 if (buf_count) {
398 memset(&buf[buf_count], 0, GHASH_BLOCK_SIZE - buf_count);
399 ghash_do_update(1, dg, buf, &ctx->ghash_key, NULL,
400 pmull_ghash_update_p64);
401 }
402 }
403
404 static void gcm_final(struct aead_request *req, struct gcm_aes_ctx *ctx,
405 u64 dg[], u8 tag[], int cryptlen)
406 {
407 u8 mac[AES_BLOCK_SIZE];
408 u128 lengths;
409
410 lengths.a = cpu_to_be64(req->assoclen * 8);
411 lengths.b = cpu_to_be64(cryptlen * 8);
412
413 ghash_do_update(1, dg, (void *)&lengths, &ctx->ghash_key, NULL,
414 pmull_ghash_update_p64);
415
416 put_unaligned_be64(dg[1], mac);
417 put_unaligned_be64(dg[0], mac + 8);
418
419 crypto_xor(tag, mac, AES_BLOCK_SIZE);
420 }
421
422 static int gcm_encrypt(struct aead_request *req)
423 {
424 struct crypto_aead *aead = crypto_aead_reqtfm(req);
425 struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
426 struct skcipher_walk walk;
427 u8 iv[AES_BLOCK_SIZE];
428 u8 ks[2 * AES_BLOCK_SIZE];
429 u8 tag[AES_BLOCK_SIZE];
430 u64 dg[2] = {};
431 int nrounds = num_rounds(&ctx->aes_key);
432 int err;
433
434 if (req->assoclen)
435 gcm_calculate_auth_mac(req, dg);
436
437 memcpy(iv, req->iv, GCM_IV_SIZE);
438 put_unaligned_be32(1, iv + GCM_IV_SIZE);
439
440 err = skcipher_walk_aead_encrypt(&walk, req, false);
441
442 if (likely(crypto_simd_usable() && walk.total >= 2 * AES_BLOCK_SIZE)) {
443 u32 const *rk = NULL;
444
445 kernel_neon_begin();
446 pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc, nrounds);
447 put_unaligned_be32(2, iv + GCM_IV_SIZE);
448 pmull_gcm_encrypt_block(ks, iv, NULL, nrounds);
449 put_unaligned_be32(3, iv + GCM_IV_SIZE);
450 pmull_gcm_encrypt_block(ks + AES_BLOCK_SIZE, iv, NULL, nrounds);
451 put_unaligned_be32(4, iv + GCM_IV_SIZE);
452
453 do {
454 int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
455
456 if (rk)
457 kernel_neon_begin();
458
459 pmull_gcm_encrypt(blocks, dg, walk.dst.virt.addr,
460 walk.src.virt.addr, &ctx->ghash_key,
461 iv, rk, nrounds, ks);
462 kernel_neon_end();
463
464 err = skcipher_walk_done(&walk,
465 walk.nbytes % (2 * AES_BLOCK_SIZE));
466
467 rk = ctx->aes_key.key_enc;
468 } while (walk.nbytes >= 2 * AES_BLOCK_SIZE);
469 } else {
470 __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv, nrounds);
471 put_unaligned_be32(2, iv + GCM_IV_SIZE);
472
473 while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
474 const int blocks =
475 walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
476 u8 *dst = walk.dst.virt.addr;
477 u8 *src = walk.src.virt.addr;
478 int remaining = blocks;
479
480 do {
481 __aes_arm64_encrypt(ctx->aes_key.key_enc,
482 ks, iv, nrounds);
483 crypto_xor_cpy(dst, src, ks, AES_BLOCK_SIZE);
484 crypto_inc(iv, AES_BLOCK_SIZE);
485
486 dst += AES_BLOCK_SIZE;
487 src += AES_BLOCK_SIZE;
488 } while (--remaining > 0);
489
490 ghash_do_update(blocks, dg,
491 walk.dst.virt.addr, &ctx->ghash_key,
492 NULL, pmull_ghash_update_p64);
493
494 err = skcipher_walk_done(&walk,
495 walk.nbytes % (2 * AES_BLOCK_SIZE));
496 }
497 if (walk.nbytes) {
498 __aes_arm64_encrypt(ctx->aes_key.key_enc, ks, iv,
499 nrounds);
500 if (walk.nbytes > AES_BLOCK_SIZE) {
501 crypto_inc(iv, AES_BLOCK_SIZE);
502 __aes_arm64_encrypt(ctx->aes_key.key_enc,
503 ks + AES_BLOCK_SIZE, iv,
504 nrounds);
505 }
506 }
507 }
508
509 /* handle the tail */
510 if (walk.nbytes) {
511 u8 buf[GHASH_BLOCK_SIZE];
512 unsigned int nbytes = walk.nbytes;
513 u8 *dst = walk.dst.virt.addr;
514 u8 *head = NULL;
515
516 crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, ks,
517 walk.nbytes);
518
519 if (walk.nbytes > GHASH_BLOCK_SIZE) {
520 head = dst;
521 dst += GHASH_BLOCK_SIZE;
522 nbytes %= GHASH_BLOCK_SIZE;
523 }
524
525 memcpy(buf, dst, nbytes);
526 memset(buf + nbytes, 0, GHASH_BLOCK_SIZE - nbytes);
527 ghash_do_update(!!nbytes, dg, buf, &ctx->ghash_key, head,
528 pmull_ghash_update_p64);
529
530 err = skcipher_walk_done(&walk, 0);
531 }
532
533 if (err)
534 return err;
535
536 gcm_final(req, ctx, dg, tag, req->cryptlen);
537
538 /* copy authtag to end of dst */
539 scatterwalk_map_and_copy(tag, req->dst, req->assoclen + req->cryptlen,
540 crypto_aead_authsize(aead), 1);
541
542 return 0;
543 }
544
545 static int gcm_decrypt(struct aead_request *req)
546 {
547 struct crypto_aead *aead = crypto_aead_reqtfm(req);
548 struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
549 unsigned int authsize = crypto_aead_authsize(aead);
550 struct skcipher_walk walk;
551 u8 iv[2 * AES_BLOCK_SIZE];
552 u8 tag[AES_BLOCK_SIZE];
553 u8 buf[2 * GHASH_BLOCK_SIZE];
554 u64 dg[2] = {};
555 int nrounds = num_rounds(&ctx->aes_key);
556 int err;
557
558 if (req->assoclen)
559 gcm_calculate_auth_mac(req, dg);
560
561 memcpy(iv, req->iv, GCM_IV_SIZE);
562 put_unaligned_be32(1, iv + GCM_IV_SIZE);
563
564 err = skcipher_walk_aead_decrypt(&walk, req, false);
565
566 if (likely(crypto_simd_usable() && walk.total >= 2 * AES_BLOCK_SIZE)) {
567 u32 const *rk = NULL;
568
569 kernel_neon_begin();
570 pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc, nrounds);
571 put_unaligned_be32(2, iv + GCM_IV_SIZE);
572
573 do {
574 int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
575 int rem = walk.total - blocks * AES_BLOCK_SIZE;
576
577 if (rk)
578 kernel_neon_begin();
579
580 pmull_gcm_decrypt(blocks, dg, walk.dst.virt.addr,
581 walk.src.virt.addr, &ctx->ghash_key,
582 iv, rk, nrounds);
583
584 /* check if this is the final iteration of the loop */
585 if (rem < (2 * AES_BLOCK_SIZE)) {
586 u8 *iv2 = iv + AES_BLOCK_SIZE;
587
588 if (rem > AES_BLOCK_SIZE) {
589 memcpy(iv2, iv, AES_BLOCK_SIZE);
590 crypto_inc(iv2, AES_BLOCK_SIZE);
591 }
592
593 pmull_gcm_encrypt_block(iv, iv, NULL, nrounds);
594
595 if (rem > AES_BLOCK_SIZE)
596 pmull_gcm_encrypt_block(iv2, iv2, NULL,
597 nrounds);
598 }
599
600 kernel_neon_end();
601
602 err = skcipher_walk_done(&walk,
603 walk.nbytes % (2 * AES_BLOCK_SIZE));
604
605 rk = ctx->aes_key.key_enc;
606 } while (walk.nbytes >= 2 * AES_BLOCK_SIZE);
607 } else {
608 __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv, nrounds);
609 put_unaligned_be32(2, iv + GCM_IV_SIZE);
610
611 while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
612 int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
613 u8 *dst = walk.dst.virt.addr;
614 u8 *src = walk.src.virt.addr;
615
616 ghash_do_update(blocks, dg, walk.src.virt.addr,
617 &ctx->ghash_key, NULL,
618 pmull_ghash_update_p64);
619
620 do {
621 __aes_arm64_encrypt(ctx->aes_key.key_enc,
622 buf, iv, nrounds);
623 crypto_xor_cpy(dst, src, buf, AES_BLOCK_SIZE);
624 crypto_inc(iv, AES_BLOCK_SIZE);
625
626 dst += AES_BLOCK_SIZE;
627 src += AES_BLOCK_SIZE;
628 } while (--blocks > 0);
629
630 err = skcipher_walk_done(&walk,
631 walk.nbytes % (2 * AES_BLOCK_SIZE));
632 }
633 if (walk.nbytes) {
634 if (walk.nbytes > AES_BLOCK_SIZE) {
635 u8 *iv2 = iv + AES_BLOCK_SIZE;
636
637 memcpy(iv2, iv, AES_BLOCK_SIZE);
638 crypto_inc(iv2, AES_BLOCK_SIZE);
639
640 __aes_arm64_encrypt(ctx->aes_key.key_enc, iv2,
641 iv2, nrounds);
642 }
643 __aes_arm64_encrypt(ctx->aes_key.key_enc, iv, iv,
644 nrounds);
645 }
646 }
647
648 /* handle the tail */
649 if (walk.nbytes) {
650 const u8 *src = walk.src.virt.addr;
651 const u8 *head = NULL;
652 unsigned int nbytes = walk.nbytes;
653
654 if (walk.nbytes > GHASH_BLOCK_SIZE) {
655 head = src;
656 src += GHASH_BLOCK_SIZE;
657 nbytes %= GHASH_BLOCK_SIZE;
658 }
659
660 memcpy(buf, src, nbytes);
661 memset(buf + nbytes, 0, GHASH_BLOCK_SIZE - nbytes);
662 ghash_do_update(!!nbytes, dg, buf, &ctx->ghash_key, head,
663 pmull_ghash_update_p64);
664
665 crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, iv,
666 walk.nbytes);
667
668 err = skcipher_walk_done(&walk, 0);
669 }
670
671 if (err)
672 return err;
673
674 gcm_final(req, ctx, dg, tag, req->cryptlen - authsize);
675
676 /* compare calculated auth tag with the stored one */
677 scatterwalk_map_and_copy(buf, req->src,
678 req->assoclen + req->cryptlen - authsize,
679 authsize, 0);
680
681 if (crypto_memneq(tag, buf, authsize))
682 return -EBADMSG;
683 return 0;
684 }
685
686 static struct aead_alg gcm_aes_alg = {
687 .ivsize = GCM_IV_SIZE,
688 .chunksize = 2 * AES_BLOCK_SIZE,
689 .maxauthsize = AES_BLOCK_SIZE,
690 .setkey = gcm_setkey,
691 .setauthsize = gcm_setauthsize,
692 .encrypt = gcm_encrypt,
693 .decrypt = gcm_decrypt,
694
695 .base.cra_name = "gcm(aes)",
696 .base.cra_driver_name = "gcm-aes-ce",
697 .base.cra_priority = 300,
698 .base.cra_blocksize = 1,
699 .base.cra_ctxsize = sizeof(struct gcm_aes_ctx),
700 .base.cra_module = THIS_MODULE,
701 };
702
703 static int __init ghash_ce_mod_init(void)
704 {
705 int ret;
706
707 if (!cpu_have_named_feature(ASIMD))
708 return -ENODEV;
709
710 if (cpu_have_named_feature(PMULL))
711 ret = crypto_register_shashes(ghash_alg,
712 ARRAY_SIZE(ghash_alg));
713 else
714 /* only register the first array element */
715 ret = crypto_register_shash(ghash_alg);
716
717 if (ret)
718 return ret;
719
720 if (cpu_have_named_feature(PMULL)) {
721 ret = crypto_register_aead(&gcm_aes_alg);
722 if (ret)
723 crypto_unregister_shashes(ghash_alg,
724 ARRAY_SIZE(ghash_alg));
725 }
726 return ret;
727 }
728
729 static void __exit ghash_ce_mod_exit(void)
730 {
731 if (cpu_have_named_feature(PMULL))
732 crypto_unregister_shashes(ghash_alg, ARRAY_SIZE(ghash_alg));
733 else
734 crypto_unregister_shash(ghash_alg);
735 crypto_unregister_aead(&gcm_aes_alg);
736 }
737
738 static const struct cpu_feature ghash_cpu_feature[] = {
739 { cpu_feature(PMULL) }, { }
740 };
741 MODULE_DEVICE_TABLE(cpu, ghash_cpu_feature);
742
743 module_init(ghash_ce_mod_init);
744 module_exit(ghash_ce_mod_exit);
Linux with added FPC-III support