1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
5 * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
11 #include <crypto/aes.h>
12 #include <crypto/ctr.h>
13 #include <crypto/sha2.h>
14 #include <crypto/internal/hash.h>
15 #include <crypto/internal/simd.h>
16 #include <crypto/internal/skcipher.h>
17 #include <crypto/scatterwalk.h>
18 #include <linux/module.h>
19 #include <linux/cpufeature.h>
20 #include <crypto/xts.h>
22 #include "aes-ce-setkey.h"
24 #ifdef USE_V8_CRYPTO_EXTENSIONS
28 #define aes_expandkey ce_aes_expandkey
29 #define aes_ecb_encrypt ce_aes_ecb_encrypt
30 #define aes_ecb_decrypt ce_aes_ecb_decrypt
31 #define aes_cbc_encrypt ce_aes_cbc_encrypt
32 #define aes_cbc_decrypt ce_aes_cbc_decrypt
33 #define aes_cbc_cts_encrypt ce_aes_cbc_cts_encrypt
34 #define aes_cbc_cts_decrypt ce_aes_cbc_cts_decrypt
35 #define aes_essiv_cbc_encrypt ce_aes_essiv_cbc_encrypt
36 #define aes_essiv_cbc_decrypt ce_aes_essiv_cbc_decrypt
37 #define aes_ctr_encrypt ce_aes_ctr_encrypt
38 #define aes_xts_encrypt ce_aes_xts_encrypt
39 #define aes_xts_decrypt ce_aes_xts_decrypt
40 #define aes_mac_update ce_aes_mac_update
41 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
46 #define aes_ecb_encrypt neon_aes_ecb_encrypt
47 #define aes_ecb_decrypt neon_aes_ecb_decrypt
48 #define aes_cbc_encrypt neon_aes_cbc_encrypt
49 #define aes_cbc_decrypt neon_aes_cbc_decrypt
50 #define aes_cbc_cts_encrypt neon_aes_cbc_cts_encrypt
51 #define aes_cbc_cts_decrypt neon_aes_cbc_cts_decrypt
52 #define aes_essiv_cbc_encrypt neon_aes_essiv_cbc_encrypt
53 #define aes_essiv_cbc_decrypt neon_aes_essiv_cbc_decrypt
54 #define aes_ctr_encrypt neon_aes_ctr_encrypt
55 #define aes_xts_encrypt neon_aes_xts_encrypt
56 #define aes_xts_decrypt neon_aes_xts_decrypt
57 #define aes_mac_update neon_aes_mac_update
58 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
60 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
61 MODULE_ALIAS_CRYPTO("ecb(aes)");
62 MODULE_ALIAS_CRYPTO("cbc(aes)");
63 MODULE_ALIAS_CRYPTO("ctr(aes)");
64 MODULE_ALIAS_CRYPTO("xts(aes)");
66 MODULE_ALIAS_CRYPTO("cts(cbc(aes))");
67 MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)");
68 MODULE_ALIAS_CRYPTO("cmac(aes)");
69 MODULE_ALIAS_CRYPTO("xcbc(aes)");
70 MODULE_ALIAS_CRYPTO("cbcmac(aes)");
72 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
73 MODULE_LICENSE("GPL v2");
75 /* defined in aes-modes.S */
76 asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[],
77 int rounds, int blocks);
78 asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u32 const rk[],
79 int rounds, int blocks);
81 asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[],
82 int rounds, int blocks, u8 iv[]);
83 asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u32 const rk[],
84 int rounds, int blocks, u8 iv[]);
86 asmlinkage void aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[],
87 int rounds, int bytes, u8 const iv[]);
88 asmlinkage void aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[],
89 int rounds, int bytes, u8 const iv[]);
91 asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u32 const rk[],
92 int rounds, int bytes, u8 ctr[], u8 finalbuf[]);
94 asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u32 const rk1[],
95 int rounds, int bytes, u32 const rk2[], u8 iv[],
97 asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u32 const rk1[],
98 int rounds, int bytes, u32 const rk2[], u8 iv[],
101 asmlinkage void aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[],
102 int rounds, int blocks, u8 iv[],
104 asmlinkage void aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[],
105 int rounds, int blocks, u8 iv[],
108 asmlinkage int aes_mac_update(u8 const in[], u32 const rk[], int rounds,
109 int blocks, u8 dg[], int enc_before,
112 struct crypto_aes_xts_ctx {
113 struct crypto_aes_ctx key1;
114 struct crypto_aes_ctx __aligned(8) key2;
117 struct crypto_aes_essiv_cbc_ctx {
118 struct crypto_aes_ctx key1;
119 struct crypto_aes_ctx __aligned(8) key2;
120 struct crypto_shash *hash;
124 struct crypto_aes_ctx key;
125 u8 __aligned(8) consts[];
128 struct mac_desc_ctx {
130 u8 dg[AES_BLOCK_SIZE];
133 static int skcipher_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
134 unsigned int key_len)
136 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
138 return aes_expandkey(ctx, in_key, key_len);
141 static int __maybe_unused xts_set_key(struct crypto_skcipher *tfm,
142 const u8 *in_key, unsigned int key_len)
144 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
147 ret = xts_verify_key(tfm, in_key, key_len);
151 ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
153 ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2],
158 static int __maybe_unused essiv_cbc_set_key(struct crypto_skcipher *tfm,
160 unsigned int key_len)
162 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
163 u8 digest[SHA256_DIGEST_SIZE];
166 ret = aes_expandkey(&ctx->key1, in_key, key_len);
170 crypto_shash_tfm_digest(ctx->hash, in_key, key_len, digest);
172 return aes_expandkey(&ctx->key2, digest, sizeof(digest));
175 static int __maybe_unused ecb_encrypt(struct skcipher_request *req)
177 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
178 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
179 int err, rounds = 6 + ctx->key_length / 4;
180 struct skcipher_walk walk;
183 err = skcipher_walk_virt(&walk, req, false);
185 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
187 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
188 ctx->key_enc, rounds, blocks);
190 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
195 static int __maybe_unused ecb_decrypt(struct skcipher_request *req)
197 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
198 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
199 int err, rounds = 6 + ctx->key_length / 4;
200 struct skcipher_walk walk;
203 err = skcipher_walk_virt(&walk, req, false);
205 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
207 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
208 ctx->key_dec, rounds, blocks);
210 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
215 static int cbc_encrypt_walk(struct skcipher_request *req,
216 struct skcipher_walk *walk)
218 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
219 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
220 int err = 0, rounds = 6 + ctx->key_length / 4;
223 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
225 aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr,
226 ctx->key_enc, rounds, blocks, walk->iv);
228 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
233 static int __maybe_unused cbc_encrypt(struct skcipher_request *req)
235 struct skcipher_walk walk;
238 err = skcipher_walk_virt(&walk, req, false);
241 return cbc_encrypt_walk(req, &walk);
244 static int cbc_decrypt_walk(struct skcipher_request *req,
245 struct skcipher_walk *walk)
247 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
248 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
249 int err = 0, rounds = 6 + ctx->key_length / 4;
252 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
254 aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr,
255 ctx->key_dec, rounds, blocks, walk->iv);
257 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
262 static int __maybe_unused cbc_decrypt(struct skcipher_request *req)
264 struct skcipher_walk walk;
267 err = skcipher_walk_virt(&walk, req, false);
270 return cbc_decrypt_walk(req, &walk);
273 static int cts_cbc_encrypt(struct skcipher_request *req)
275 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
276 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
277 int err, rounds = 6 + ctx->key_length / 4;
278 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
279 struct scatterlist *src = req->src, *dst = req->dst;
280 struct scatterlist sg_src[2], sg_dst[2];
281 struct skcipher_request subreq;
282 struct skcipher_walk walk;
284 skcipher_request_set_tfm(&subreq, tfm);
285 skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
288 if (req->cryptlen <= AES_BLOCK_SIZE) {
289 if (req->cryptlen < AES_BLOCK_SIZE)
294 if (cbc_blocks > 0) {
295 skcipher_request_set_crypt(&subreq, req->src, req->dst,
296 cbc_blocks * AES_BLOCK_SIZE,
299 err = skcipher_walk_virt(&walk, &subreq, false) ?:
300 cbc_encrypt_walk(&subreq, &walk);
304 if (req->cryptlen == AES_BLOCK_SIZE)
307 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
308 if (req->dst != req->src)
309 dst = scatterwalk_ffwd(sg_dst, req->dst,
313 /* handle ciphertext stealing */
314 skcipher_request_set_crypt(&subreq, src, dst,
315 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
318 err = skcipher_walk_virt(&walk, &subreq, false);
323 aes_cbc_cts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
324 ctx->key_enc, rounds, walk.nbytes, walk.iv);
327 return skcipher_walk_done(&walk, 0);
330 static int cts_cbc_decrypt(struct skcipher_request *req)
332 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
333 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
334 int err, rounds = 6 + ctx->key_length / 4;
335 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
336 struct scatterlist *src = req->src, *dst = req->dst;
337 struct scatterlist sg_src[2], sg_dst[2];
338 struct skcipher_request subreq;
339 struct skcipher_walk walk;
341 skcipher_request_set_tfm(&subreq, tfm);
342 skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
345 if (req->cryptlen <= AES_BLOCK_SIZE) {
346 if (req->cryptlen < AES_BLOCK_SIZE)
351 if (cbc_blocks > 0) {
352 skcipher_request_set_crypt(&subreq, req->src, req->dst,
353 cbc_blocks * AES_BLOCK_SIZE,
356 err = skcipher_walk_virt(&walk, &subreq, false) ?:
357 cbc_decrypt_walk(&subreq, &walk);
361 if (req->cryptlen == AES_BLOCK_SIZE)
364 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
365 if (req->dst != req->src)
366 dst = scatterwalk_ffwd(sg_dst, req->dst,
370 /* handle ciphertext stealing */
371 skcipher_request_set_crypt(&subreq, src, dst,
372 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
375 err = skcipher_walk_virt(&walk, &subreq, false);
380 aes_cbc_cts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
381 ctx->key_dec, rounds, walk.nbytes, walk.iv);
384 return skcipher_walk_done(&walk, 0);
387 static int __maybe_unused essiv_cbc_init_tfm(struct crypto_skcipher *tfm)
389 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
391 ctx->hash = crypto_alloc_shash("sha256", 0, 0);
393 return PTR_ERR_OR_ZERO(ctx->hash);
396 static void __maybe_unused essiv_cbc_exit_tfm(struct crypto_skcipher *tfm)
398 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
400 crypto_free_shash(ctx->hash);
403 static int __maybe_unused essiv_cbc_encrypt(struct skcipher_request *req)
405 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
406 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
407 int err, rounds = 6 + ctx->key1.key_length / 4;
408 struct skcipher_walk walk;
411 err = skcipher_walk_virt(&walk, req, false);
413 blocks = walk.nbytes / AES_BLOCK_SIZE;
416 aes_essiv_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
417 ctx->key1.key_enc, rounds, blocks,
418 req->iv, ctx->key2.key_enc);
420 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
422 return err ?: cbc_encrypt_walk(req, &walk);
425 static int __maybe_unused essiv_cbc_decrypt(struct skcipher_request *req)
427 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
428 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
429 int err, rounds = 6 + ctx->key1.key_length / 4;
430 struct skcipher_walk walk;
433 err = skcipher_walk_virt(&walk, req, false);
435 blocks = walk.nbytes / AES_BLOCK_SIZE;
438 aes_essiv_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
439 ctx->key1.key_dec, rounds, blocks,
440 req->iv, ctx->key2.key_enc);
442 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
444 return err ?: cbc_decrypt_walk(req, &walk);
447 static int ctr_encrypt(struct skcipher_request *req)
449 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
450 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
451 int err, rounds = 6 + ctx->key_length / 4;
452 struct skcipher_walk walk;
454 err = skcipher_walk_virt(&walk, req, false);
456 while (walk.nbytes > 0) {
457 const u8 *src = walk.src.virt.addr;
458 unsigned int nbytes = walk.nbytes;
459 u8 *dst = walk.dst.virt.addr;
460 u8 buf[AES_BLOCK_SIZE];
463 if (unlikely(nbytes < AES_BLOCK_SIZE))
464 src = memcpy(buf, src, nbytes);
465 else if (nbytes < walk.total)
466 nbytes &= ~(AES_BLOCK_SIZE - 1);
469 aes_ctr_encrypt(dst, src, ctx->key_enc, rounds, nbytes,
473 tail = nbytes % (STRIDE * AES_BLOCK_SIZE);
474 if (tail > 0 && tail < AES_BLOCK_SIZE)
476 * The final partial block could not be returned using
477 * an overlapping store, so it was passed via buf[]
480 memcpy(dst + nbytes - tail, buf, tail);
482 err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
488 static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
490 const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
494 * Temporarily disable interrupts to avoid races where
495 * cachelines are evicted when the CPU is interrupted
496 * to do something else.
498 local_irq_save(flags);
499 aes_encrypt(ctx, dst, src);
500 local_irq_restore(flags);
503 static int __maybe_unused ctr_encrypt_sync(struct skcipher_request *req)
505 if (!crypto_simd_usable())
506 return crypto_ctr_encrypt_walk(req, ctr_encrypt_one);
508 return ctr_encrypt(req);
511 static int __maybe_unused xts_encrypt(struct skcipher_request *req)
513 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
514 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
515 int err, first, rounds = 6 + ctx->key1.key_length / 4;
516 int tail = req->cryptlen % AES_BLOCK_SIZE;
517 struct scatterlist sg_src[2], sg_dst[2];
518 struct skcipher_request subreq;
519 struct scatterlist *src, *dst;
520 struct skcipher_walk walk;
522 if (req->cryptlen < AES_BLOCK_SIZE)
525 err = skcipher_walk_virt(&walk, req, false);
527 if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
528 int xts_blocks = DIV_ROUND_UP(req->cryptlen,
531 skcipher_walk_abort(&walk);
533 skcipher_request_set_tfm(&subreq, tfm);
534 skcipher_request_set_callback(&subreq,
535 skcipher_request_flags(req),
537 skcipher_request_set_crypt(&subreq, req->src, req->dst,
538 xts_blocks * AES_BLOCK_SIZE,
541 err = skcipher_walk_virt(&walk, req, false);
546 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) {
547 int nbytes = walk.nbytes;
549 if (walk.nbytes < walk.total)
550 nbytes &= ~(AES_BLOCK_SIZE - 1);
553 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
554 ctx->key1.key_enc, rounds, nbytes,
555 ctx->key2.key_enc, walk.iv, first);
557 err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
560 if (err || likely(!tail))
563 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
564 if (req->dst != req->src)
565 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);
567 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
570 err = skcipher_walk_virt(&walk, &subreq, false);
575 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
576 ctx->key1.key_enc, rounds, walk.nbytes,
577 ctx->key2.key_enc, walk.iv, first);
580 return skcipher_walk_done(&walk, 0);
583 static int __maybe_unused xts_decrypt(struct skcipher_request *req)
585 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
586 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
587 int err, first, rounds = 6 + ctx->key1.key_length / 4;
588 int tail = req->cryptlen % AES_BLOCK_SIZE;
589 struct scatterlist sg_src[2], sg_dst[2];
590 struct skcipher_request subreq;
591 struct scatterlist *src, *dst;
592 struct skcipher_walk walk;
594 if (req->cryptlen < AES_BLOCK_SIZE)
597 err = skcipher_walk_virt(&walk, req, false);
599 if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
600 int xts_blocks = DIV_ROUND_UP(req->cryptlen,
603 skcipher_walk_abort(&walk);
605 skcipher_request_set_tfm(&subreq, tfm);
606 skcipher_request_set_callback(&subreq,
607 skcipher_request_flags(req),
609 skcipher_request_set_crypt(&subreq, req->src, req->dst,
610 xts_blocks * AES_BLOCK_SIZE,
613 err = skcipher_walk_virt(&walk, req, false);
618 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) {
619 int nbytes = walk.nbytes;
621 if (walk.nbytes < walk.total)
622 nbytes &= ~(AES_BLOCK_SIZE - 1);
625 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
626 ctx->key1.key_dec, rounds, nbytes,
627 ctx->key2.key_enc, walk.iv, first);
629 err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
632 if (err || likely(!tail))
635 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
636 if (req->dst != req->src)
637 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);
639 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
642 err = skcipher_walk_virt(&walk, &subreq, false);
648 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
649 ctx->key1.key_dec, rounds, walk.nbytes,
650 ctx->key2.key_enc, walk.iv, first);
653 return skcipher_walk_done(&walk, 0);
656 static struct skcipher_alg aes_algs[] = { {
657 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
659 .cra_name = "__ecb(aes)",
660 .cra_driver_name = "__ecb-aes-" MODE,
661 .cra_priority = PRIO,
662 .cra_flags = CRYPTO_ALG_INTERNAL,
663 .cra_blocksize = AES_BLOCK_SIZE,
664 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
665 .cra_module = THIS_MODULE,
667 .min_keysize = AES_MIN_KEY_SIZE,
668 .max_keysize = AES_MAX_KEY_SIZE,
669 .setkey = skcipher_aes_setkey,
670 .encrypt = ecb_encrypt,
671 .decrypt = ecb_decrypt,
674 .cra_name = "__cbc(aes)",
675 .cra_driver_name = "__cbc-aes-" MODE,
676 .cra_priority = PRIO,
677 .cra_flags = CRYPTO_ALG_INTERNAL,
678 .cra_blocksize = AES_BLOCK_SIZE,
679 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
680 .cra_module = THIS_MODULE,
682 .min_keysize = AES_MIN_KEY_SIZE,
683 .max_keysize = AES_MAX_KEY_SIZE,
684 .ivsize = AES_BLOCK_SIZE,
685 .setkey = skcipher_aes_setkey,
686 .encrypt = cbc_encrypt,
687 .decrypt = cbc_decrypt,
690 .cra_name = "__ctr(aes)",
691 .cra_driver_name = "__ctr-aes-" MODE,
692 .cra_priority = PRIO,
693 .cra_flags = CRYPTO_ALG_INTERNAL,
695 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
696 .cra_module = THIS_MODULE,
698 .min_keysize = AES_MIN_KEY_SIZE,
699 .max_keysize = AES_MAX_KEY_SIZE,
700 .ivsize = AES_BLOCK_SIZE,
701 .chunksize = AES_BLOCK_SIZE,
702 .setkey = skcipher_aes_setkey,
703 .encrypt = ctr_encrypt,
704 .decrypt = ctr_encrypt,
707 .cra_name = "ctr(aes)",
708 .cra_driver_name = "ctr-aes-" MODE,
709 .cra_priority = PRIO - 1,
711 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
712 .cra_module = THIS_MODULE,
714 .min_keysize = AES_MIN_KEY_SIZE,
715 .max_keysize = AES_MAX_KEY_SIZE,
716 .ivsize = AES_BLOCK_SIZE,
717 .chunksize = AES_BLOCK_SIZE,
718 .setkey = skcipher_aes_setkey,
719 .encrypt = ctr_encrypt_sync,
720 .decrypt = ctr_encrypt_sync,
723 .cra_name = "__xts(aes)",
724 .cra_driver_name = "__xts-aes-" MODE,
725 .cra_priority = PRIO,
726 .cra_flags = CRYPTO_ALG_INTERNAL,
727 .cra_blocksize = AES_BLOCK_SIZE,
728 .cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
729 .cra_module = THIS_MODULE,
731 .min_keysize = 2 * AES_MIN_KEY_SIZE,
732 .max_keysize = 2 * AES_MAX_KEY_SIZE,
733 .ivsize = AES_BLOCK_SIZE,
734 .walksize = 2 * AES_BLOCK_SIZE,
735 .setkey = xts_set_key,
736 .encrypt = xts_encrypt,
737 .decrypt = xts_decrypt,
741 .cra_name = "__cts(cbc(aes))",
742 .cra_driver_name = "__cts-cbc-aes-" MODE,
743 .cra_priority = PRIO,
744 .cra_flags = CRYPTO_ALG_INTERNAL,
745 .cra_blocksize = AES_BLOCK_SIZE,
746 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
747 .cra_module = THIS_MODULE,
749 .min_keysize = AES_MIN_KEY_SIZE,
750 .max_keysize = AES_MAX_KEY_SIZE,
751 .ivsize = AES_BLOCK_SIZE,
752 .walksize = 2 * AES_BLOCK_SIZE,
753 .setkey = skcipher_aes_setkey,
754 .encrypt = cts_cbc_encrypt,
755 .decrypt = cts_cbc_decrypt,
758 .cra_name = "__essiv(cbc(aes),sha256)",
759 .cra_driver_name = "__essiv-cbc-aes-sha256-" MODE,
760 .cra_priority = PRIO + 1,
761 .cra_flags = CRYPTO_ALG_INTERNAL,
762 .cra_blocksize = AES_BLOCK_SIZE,
763 .cra_ctxsize = sizeof(struct crypto_aes_essiv_cbc_ctx),
764 .cra_module = THIS_MODULE,
766 .min_keysize = AES_MIN_KEY_SIZE,
767 .max_keysize = AES_MAX_KEY_SIZE,
768 .ivsize = AES_BLOCK_SIZE,
769 .setkey = essiv_cbc_set_key,
770 .encrypt = essiv_cbc_encrypt,
771 .decrypt = essiv_cbc_decrypt,
772 .init = essiv_cbc_init_tfm,
773 .exit = essiv_cbc_exit_tfm,
776 static int cbcmac_setkey(struct crypto_shash *tfm, const u8 *in_key,
777 unsigned int key_len)
779 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
781 return aes_expandkey(&ctx->key, in_key, key_len);
784 static void cmac_gf128_mul_by_x(be128 *y, const be128 *x)
786 u64 a = be64_to_cpu(x->a);
787 u64 b = be64_to_cpu(x->b);
789 y->a = cpu_to_be64((a << 1) | (b >> 63));
790 y->b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0));
793 static int cmac_setkey(struct crypto_shash *tfm, const u8 *in_key,
794 unsigned int key_len)
796 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
797 be128 *consts = (be128 *)ctx->consts;
798 int rounds = 6 + key_len / 4;
801 err = cbcmac_setkey(tfm, in_key, key_len);
805 /* encrypt the zero vector */
807 aes_ecb_encrypt(ctx->consts, (u8[AES_BLOCK_SIZE]){}, ctx->key.key_enc,
811 cmac_gf128_mul_by_x(consts, consts);
812 cmac_gf128_mul_by_x(consts + 1, consts);
817 static int xcbc_setkey(struct crypto_shash *tfm, const u8 *in_key,
818 unsigned int key_len)
820 static u8 const ks[3][AES_BLOCK_SIZE] = {
821 { [0 ... AES_BLOCK_SIZE - 1] = 0x1 },
822 { [0 ... AES_BLOCK_SIZE - 1] = 0x2 },
823 { [0 ... AES_BLOCK_SIZE - 1] = 0x3 },
826 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
827 int rounds = 6 + key_len / 4;
828 u8 key[AES_BLOCK_SIZE];
831 err = cbcmac_setkey(tfm, in_key, key_len);
836 aes_ecb_encrypt(key, ks[0], ctx->key.key_enc, rounds, 1);
837 aes_ecb_encrypt(ctx->consts, ks[1], ctx->key.key_enc, rounds, 2);
840 return cbcmac_setkey(tfm, key, sizeof(key));
843 static int mac_init(struct shash_desc *desc)
845 struct mac_desc_ctx *ctx = shash_desc_ctx(desc);
847 memset(ctx->dg, 0, AES_BLOCK_SIZE);
853 static void mac_do_update(struct crypto_aes_ctx *ctx, u8 const in[], int blocks,
854 u8 dg[], int enc_before, int enc_after)
856 int rounds = 6 + ctx->key_length / 4;
858 if (crypto_simd_usable()) {
863 rem = aes_mac_update(in, ctx->key_enc, rounds, blocks,
864 dg, enc_before, enc_after);
866 in += (blocks - rem) * AES_BLOCK_SIZE;
872 aes_encrypt(ctx, dg, dg);
875 crypto_xor(dg, in, AES_BLOCK_SIZE);
876 in += AES_BLOCK_SIZE;
878 if (blocks || enc_after)
879 aes_encrypt(ctx, dg, dg);
884 static int mac_update(struct shash_desc *desc, const u8 *p, unsigned int len)
886 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
887 struct mac_desc_ctx *ctx = shash_desc_ctx(desc);
892 if ((ctx->len % AES_BLOCK_SIZE) == 0 &&
893 (ctx->len + len) > AES_BLOCK_SIZE) {
895 int blocks = len / AES_BLOCK_SIZE;
897 len %= AES_BLOCK_SIZE;
899 mac_do_update(&tctx->key, p, blocks, ctx->dg,
900 (ctx->len != 0), (len != 0));
902 p += blocks * AES_BLOCK_SIZE;
905 ctx->len = AES_BLOCK_SIZE;
911 l = min(len, AES_BLOCK_SIZE - ctx->len);
913 if (l <= AES_BLOCK_SIZE) {
914 crypto_xor(ctx->dg + ctx->len, p, l);
924 static int cbcmac_final(struct shash_desc *desc, u8 *out)
926 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
927 struct mac_desc_ctx *ctx = shash_desc_ctx(desc);
929 mac_do_update(&tctx->key, NULL, 0, ctx->dg, (ctx->len != 0), 0);
931 memcpy(out, ctx->dg, AES_BLOCK_SIZE);
936 static int cmac_final(struct shash_desc *desc, u8 *out)
938 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
939 struct mac_desc_ctx *ctx = shash_desc_ctx(desc);
940 u8 *consts = tctx->consts;
942 if (ctx->len != AES_BLOCK_SIZE) {
943 ctx->dg[ctx->len] ^= 0x80;
944 consts += AES_BLOCK_SIZE;
947 mac_do_update(&tctx->key, consts, 1, ctx->dg, 0, 1);
949 memcpy(out, ctx->dg, AES_BLOCK_SIZE);
954 static struct shash_alg mac_algs[] = { {
955 .base.cra_name = "cmac(aes)",
956 .base.cra_driver_name = "cmac-aes-" MODE,
957 .base.cra_priority = PRIO,
958 .base.cra_blocksize = AES_BLOCK_SIZE,
959 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) +
961 .base.cra_module = THIS_MODULE,
963 .digestsize = AES_BLOCK_SIZE,
965 .update = mac_update,
967 .setkey = cmac_setkey,
968 .descsize = sizeof(struct mac_desc_ctx),
970 .base.cra_name = "xcbc(aes)",
971 .base.cra_driver_name = "xcbc-aes-" MODE,
972 .base.cra_priority = PRIO,
973 .base.cra_blocksize = AES_BLOCK_SIZE,
974 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) +
976 .base.cra_module = THIS_MODULE,
978 .digestsize = AES_BLOCK_SIZE,
980 .update = mac_update,
982 .setkey = xcbc_setkey,
983 .descsize = sizeof(struct mac_desc_ctx),
985 .base.cra_name = "cbcmac(aes)",
986 .base.cra_driver_name = "cbcmac-aes-" MODE,
987 .base.cra_priority = PRIO,
988 .base.cra_blocksize = 1,
989 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx),
990 .base.cra_module = THIS_MODULE,
992 .digestsize = AES_BLOCK_SIZE,
994 .update = mac_update,
995 .final = cbcmac_final,
996 .setkey = cbcmac_setkey,
997 .descsize = sizeof(struct mac_desc_ctx),
1000 static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];
1002 static void aes_exit(void)
1006 for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++)
1007 if (aes_simd_algs[i])
1008 simd_skcipher_free(aes_simd_algs[i]);
1010 crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs));
1011 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1014 static int __init aes_init(void)
1016 struct simd_skcipher_alg *simd;
1017 const char *basename;
1018 const char *algname;
1019 const char *drvname;
1023 err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1027 err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs));
1029 goto unregister_ciphers;
1031 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
1032 if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL))
1035 algname = aes_algs[i].base.cra_name + 2;
1036 drvname = aes_algs[i].base.cra_driver_name + 2;
1037 basename = aes_algs[i].base.cra_driver_name;
1038 simd = simd_skcipher_create_compat(algname, drvname, basename);
1039 err = PTR_ERR(simd);
1041 goto unregister_simds;
1043 aes_simd_algs[i] = simd;
1052 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1056 #ifdef USE_V8_CRYPTO_EXTENSIONS
1057 module_cpu_feature_match(AES, aes_init);
1059 module_init(aes_init);
1060 EXPORT_SYMBOL(neon_aes_ecb_encrypt);
1061 EXPORT_SYMBOL(neon_aes_cbc_encrypt);
1062 EXPORT_SYMBOL(neon_aes_xts_encrypt);
1063 EXPORT_SYMBOL(neon_aes_xts_decrypt);
1065 module_exit(aes_exit);