Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * The AEGIS-128 Authenticated-Encryption Algorithm
4 *
5 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
6 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
7 */
8
9#include <crypto/algapi.h>
10#include <crypto/internal/aead.h>
11#include <crypto/internal/simd.h>
12#include <crypto/internal/skcipher.h>
13#include <crypto/scatterwalk.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/jump_label.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/scatterlist.h>
20
21#include <asm/simd.h>
22
23#include "aegis.h"
24
25#define AEGIS128_NONCE_SIZE 16
26#define AEGIS128_STATE_BLOCKS 5
27#define AEGIS128_KEY_SIZE 16
28#define AEGIS128_MIN_AUTH_SIZE 8
29#define AEGIS128_MAX_AUTH_SIZE 16
30
31struct aegis_state {
32 union aegis_block blocks[AEGIS128_STATE_BLOCKS];
33};
34
35struct aegis_ctx {
36 union aegis_block key;
37};
38
39static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);
40
41static const union aegis_block crypto_aegis_const[2] = {
42 { .words64 = {
43 cpu_to_le64(U64_C(0x0d08050302010100)),
44 cpu_to_le64(U64_C(0x6279e99059372215)),
45 } },
46 { .words64 = {
47 cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
48 cpu_to_le64(U64_C(0xdd28b57342311120)),
49 } },
50};
51
52static bool aegis128_do_simd(void)
53{
54#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
55 if (static_branch_likely(&have_simd))
56 return crypto_simd_usable();
57#endif
58 return false;
59}
60
61static void crypto_aegis128_update(struct aegis_state *state)
62{
63 union aegis_block tmp;
64 unsigned int i;
65
66 tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
67 for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
68 crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
69 &state->blocks[i]);
70 crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
71}
72
73static void crypto_aegis128_update_a(struct aegis_state *state,
74 const union aegis_block *msg,
75 bool do_simd)
76{
77 if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
78 crypto_aegis128_update_simd(state, msg);
79 return;
80 }
81
82 crypto_aegis128_update(state);
83 crypto_aegis_block_xor(&state->blocks[0], msg);
84}
85
86static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg,
87 bool do_simd)
88{
89 if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
90 crypto_aegis128_update_simd(state, msg);
91 return;
92 }
93
94 crypto_aegis128_update(state);
95 crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
96}
97
98static void crypto_aegis128_init(struct aegis_state *state,
99 const union aegis_block *key,
100 const u8 *iv)
101{
102 union aegis_block key_iv;
103 unsigned int i;
104
105 key_iv = *key;
106 crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
107
108 state->blocks[0] = key_iv;
109 state->blocks[1] = crypto_aegis_const[1];
110 state->blocks[2] = crypto_aegis_const[0];
111 state->blocks[3] = *key;
112 state->blocks[4] = *key;
113
114 crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
115 crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
116
117 for (i = 0; i < 5; i++) {
118 crypto_aegis128_update_a(state, key, false);
119 crypto_aegis128_update_a(state, &key_iv, false);
120 }
121}
122
123static void crypto_aegis128_ad(struct aegis_state *state,
124 const u8 *src, unsigned int size,
125 bool do_simd)
126{
127 if (AEGIS_ALIGNED(src)) {
128 const union aegis_block *src_blk =
129 (const union aegis_block *)src;
130
131 while (size >= AEGIS_BLOCK_SIZE) {
132 crypto_aegis128_update_a(state, src_blk, do_simd);
133
134 size -= AEGIS_BLOCK_SIZE;
135 src_blk++;
136 }
137 } else {
138 while (size >= AEGIS_BLOCK_SIZE) {
139 crypto_aegis128_update_u(state, src, do_simd);
140
141 size -= AEGIS_BLOCK_SIZE;
142 src += AEGIS_BLOCK_SIZE;
143 }
144 }
145}
146
147static void crypto_aegis128_wipe_chunk(struct aegis_state *state, u8 *dst,
148 const u8 *src, unsigned int size)
149{
150 memzero_explicit(dst, size);
151}
152
153static void crypto_aegis128_encrypt_chunk(struct aegis_state *state, u8 *dst,
154 const u8 *src, unsigned int size)
155{
156 union aegis_block tmp;
157
158 if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
159 while (size >= AEGIS_BLOCK_SIZE) {
160 union aegis_block *dst_blk =
161 (union aegis_block *)dst;
162 const union aegis_block *src_blk =
163 (const union aegis_block *)src;
164
165 tmp = state->blocks[2];
166 crypto_aegis_block_and(&tmp, &state->blocks[3]);
167 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
168 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
169 crypto_aegis_block_xor(&tmp, src_blk);
170
171 crypto_aegis128_update_a(state, src_blk, false);
172
173 *dst_blk = tmp;
174
175 size -= AEGIS_BLOCK_SIZE;
176 src += AEGIS_BLOCK_SIZE;
177 dst += AEGIS_BLOCK_SIZE;
178 }
179 } else {
180 while (size >= AEGIS_BLOCK_SIZE) {
181 tmp = state->blocks[2];
182 crypto_aegis_block_and(&tmp, &state->blocks[3]);
183 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
184 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
185 crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
186
187 crypto_aegis128_update_u(state, src, false);
188
189 memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
190
191 size -= AEGIS_BLOCK_SIZE;
192 src += AEGIS_BLOCK_SIZE;
193 dst += AEGIS_BLOCK_SIZE;
194 }
195 }
196
197 if (size > 0) {
198 union aegis_block msg = {};
199 memcpy(msg.bytes, src, size);
200
201 tmp = state->blocks[2];
202 crypto_aegis_block_and(&tmp, &state->blocks[3]);
203 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
204 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
205
206 crypto_aegis128_update_a(state, &msg, false);
207
208 crypto_aegis_block_xor(&msg, &tmp);
209
210 memcpy(dst, msg.bytes, size);
211 }
212}
213
214static void crypto_aegis128_decrypt_chunk(struct aegis_state *state, u8 *dst,
215 const u8 *src, unsigned int size)
216{
217 union aegis_block tmp;
218
219 if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
220 while (size >= AEGIS_BLOCK_SIZE) {
221 union aegis_block *dst_blk =
222 (union aegis_block *)dst;
223 const union aegis_block *src_blk =
224 (const union aegis_block *)src;
225
226 tmp = state->blocks[2];
227 crypto_aegis_block_and(&tmp, &state->blocks[3]);
228 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
229 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
230 crypto_aegis_block_xor(&tmp, src_blk);
231
232 crypto_aegis128_update_a(state, &tmp, false);
233
234 *dst_blk = tmp;
235
236 size -= AEGIS_BLOCK_SIZE;
237 src += AEGIS_BLOCK_SIZE;
238 dst += AEGIS_BLOCK_SIZE;
239 }
240 } else {
241 while (size >= AEGIS_BLOCK_SIZE) {
242 tmp = state->blocks[2];
243 crypto_aegis_block_and(&tmp, &state->blocks[3]);
244 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
245 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
246 crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
247
248 crypto_aegis128_update_a(state, &tmp, false);
249
250 memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
251
252 size -= AEGIS_BLOCK_SIZE;
253 src += AEGIS_BLOCK_SIZE;
254 dst += AEGIS_BLOCK_SIZE;
255 }
256 }
257
258 if (size > 0) {
259 union aegis_block msg = {};
260 memcpy(msg.bytes, src, size);
261
262 tmp = state->blocks[2];
263 crypto_aegis_block_and(&tmp, &state->blocks[3]);
264 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
265 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
266 crypto_aegis_block_xor(&msg, &tmp);
267
268 memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
269
270 crypto_aegis128_update_a(state, &msg, false);
271
272 memcpy(dst, msg.bytes, size);
273 }
274}
275
276static void crypto_aegis128_process_ad(struct aegis_state *state,
277 struct scatterlist *sg_src,
278 unsigned int assoclen,
279 bool do_simd)
280{
281 struct scatter_walk walk;
282 union aegis_block buf;
283 unsigned int pos = 0;
284
285 scatterwalk_start(&walk, sg_src);
286 while (assoclen != 0) {
287 unsigned int size = scatterwalk_clamp(&walk, assoclen);
288 unsigned int left = size;
289 void *mapped = scatterwalk_map(&walk);
290 const u8 *src = (const u8 *)mapped;
291
292 if (pos + size >= AEGIS_BLOCK_SIZE) {
293 if (pos > 0) {
294 unsigned int fill = AEGIS_BLOCK_SIZE - pos;
295 memcpy(buf.bytes + pos, src, fill);
296 crypto_aegis128_update_a(state, &buf, do_simd);
297 pos = 0;
298 left -= fill;
299 src += fill;
300 }
301
302 crypto_aegis128_ad(state, src, left, do_simd);
303 src += left & ~(AEGIS_BLOCK_SIZE - 1);
304 left &= AEGIS_BLOCK_SIZE - 1;
305 }
306
307 memcpy(buf.bytes + pos, src, left);
308
309 pos += left;
310 assoclen -= size;
311 scatterwalk_unmap(mapped);
312 scatterwalk_advance(&walk, size);
313 scatterwalk_done(&walk, 0, assoclen);
314 }
315
316 if (pos > 0) {
317 memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
318 crypto_aegis128_update_a(state, &buf, do_simd);
319 }
320}
321
322static __always_inline
323int crypto_aegis128_process_crypt(struct aegis_state *state,
324 struct skcipher_walk *walk,
325 void (*crypt)(struct aegis_state *state,
326 u8 *dst, const u8 *src,
327 unsigned int size))
328{
329 int err = 0;
330
331 while (walk->nbytes) {
332 unsigned int nbytes = walk->nbytes;
333
334 if (nbytes < walk->total)
335 nbytes = round_down(nbytes, walk->stride);
336
337 crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
338
339 err = skcipher_walk_done(walk, walk->nbytes - nbytes);
340 }
341 return err;
342}
343
344static void crypto_aegis128_final(struct aegis_state *state,
345 union aegis_block *tag_xor,
346 u64 assoclen, u64 cryptlen)
347{
348 u64 assocbits = assoclen * 8;
349 u64 cryptbits = cryptlen * 8;
350
351 union aegis_block tmp;
352 unsigned int i;
353
354 tmp.words64[0] = cpu_to_le64(assocbits);
355 tmp.words64[1] = cpu_to_le64(cryptbits);
356
357 crypto_aegis_block_xor(&tmp, &state->blocks[3]);
358
359 for (i = 0; i < 7; i++)
360 crypto_aegis128_update_a(state, &tmp, false);
361
362 for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
363 crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
364}
365
366static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key,
367 unsigned int keylen)
368{
369 struct aegis_ctx *ctx = crypto_aead_ctx(aead);
370
371 if (keylen != AEGIS128_KEY_SIZE)
372 return -EINVAL;
373
374 memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
375 return 0;
376}
377
378static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
379 unsigned int authsize)
380{
381 if (authsize > AEGIS128_MAX_AUTH_SIZE)
382 return -EINVAL;
383 if (authsize < AEGIS128_MIN_AUTH_SIZE)
384 return -EINVAL;
385 return 0;
386}
387
388static int crypto_aegis128_encrypt_generic(struct aead_request *req)
389{
390 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
391 union aegis_block tag = {};
392 unsigned int authsize = crypto_aead_authsize(tfm);
393 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
394 unsigned int cryptlen = req->cryptlen;
395 struct skcipher_walk walk;
396 struct aegis_state state;
397
398 skcipher_walk_aead_encrypt(&walk, req, false);
399 crypto_aegis128_init(&state, &ctx->key, req->iv);
400 crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
401 crypto_aegis128_process_crypt(&state, &walk,
402 crypto_aegis128_encrypt_chunk);
403 crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
404
405 scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
406 authsize, 1);
407 return 0;
408}
409
410static int crypto_aegis128_decrypt_generic(struct aead_request *req)
411{
412 static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
413 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
414 union aegis_block tag;
415 unsigned int authsize = crypto_aead_authsize(tfm);
416 unsigned int cryptlen = req->cryptlen - authsize;
417 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
418 struct skcipher_walk walk;
419 struct aegis_state state;
420
421 scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
422 authsize, 0);
423
424 skcipher_walk_aead_decrypt(&walk, req, false);
425 crypto_aegis128_init(&state, &ctx->key, req->iv);
426 crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
427 crypto_aegis128_process_crypt(&state, &walk,
428 crypto_aegis128_decrypt_chunk);
429 crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
430
431 if (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) {
432 /*
433 * From Chapter 4. 'Security Analysis' of the AEGIS spec [0]
434 *
435 * "3. If verification fails, the decrypted plaintext and the
436 * wrong authentication tag should not be given as output."
437 *
438 * [0] https://competitions.cr.yp.to/round3/aegisv11.pdf
439 */
440 skcipher_walk_aead_decrypt(&walk, req, false);
441 crypto_aegis128_process_crypt(NULL, &walk,
442 crypto_aegis128_wipe_chunk);
443 memzero_explicit(&tag, sizeof(tag));
444 return -EBADMSG;
445 }
446 return 0;
447}
448
449static int crypto_aegis128_encrypt_simd(struct aead_request *req)
450{
451 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
452 union aegis_block tag = {};
453 unsigned int authsize = crypto_aead_authsize(tfm);
454 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
455 unsigned int cryptlen = req->cryptlen;
456 struct skcipher_walk walk;
457 struct aegis_state state;
458
459 if (!aegis128_do_simd())
460 return crypto_aegis128_encrypt_generic(req);
461
462 skcipher_walk_aead_encrypt(&walk, req, false);
463 crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
464 crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
465 crypto_aegis128_process_crypt(&state, &walk,
466 crypto_aegis128_encrypt_chunk_simd);
467 crypto_aegis128_final_simd(&state, &tag, req->assoclen, cryptlen, 0);
468
469 scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
470 authsize, 1);
471 return 0;
472}
473
474static int crypto_aegis128_decrypt_simd(struct aead_request *req)
475{
476 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
477 union aegis_block tag;
478 unsigned int authsize = crypto_aead_authsize(tfm);
479 unsigned int cryptlen = req->cryptlen - authsize;
480 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
481 struct skcipher_walk walk;
482 struct aegis_state state;
483
484 if (!aegis128_do_simd())
485 return crypto_aegis128_decrypt_generic(req);
486
487 scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
488 authsize, 0);
489
490 skcipher_walk_aead_decrypt(&walk, req, false);
491 crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
492 crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
493 crypto_aegis128_process_crypt(&state, &walk,
494 crypto_aegis128_decrypt_chunk_simd);
495
496 if (unlikely(crypto_aegis128_final_simd(&state, &tag, req->assoclen,
497 cryptlen, authsize))) {
498 skcipher_walk_aead_decrypt(&walk, req, false);
499 crypto_aegis128_process_crypt(NULL, &walk,
500 crypto_aegis128_wipe_chunk);
501 return -EBADMSG;
502 }
503 return 0;
504}
505
506static struct aead_alg crypto_aegis128_alg_generic = {
507 .setkey = crypto_aegis128_setkey,
508 .setauthsize = crypto_aegis128_setauthsize,
509 .encrypt = crypto_aegis128_encrypt_generic,
510 .decrypt = crypto_aegis128_decrypt_generic,
511
512 .ivsize = AEGIS128_NONCE_SIZE,
513 .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
514 .chunksize = AEGIS_BLOCK_SIZE,
515
516 .base.cra_blocksize = 1,
517 .base.cra_ctxsize = sizeof(struct aegis_ctx),
518 .base.cra_alignmask = 0,
519 .base.cra_priority = 100,
520 .base.cra_name = "aegis128",
521 .base.cra_driver_name = "aegis128-generic",
522 .base.cra_module = THIS_MODULE,
523};
524
525static struct aead_alg crypto_aegis128_alg_simd = {
526 .setkey = crypto_aegis128_setkey,
527 .setauthsize = crypto_aegis128_setauthsize,
528 .encrypt = crypto_aegis128_encrypt_simd,
529 .decrypt = crypto_aegis128_decrypt_simd,
530
531 .ivsize = AEGIS128_NONCE_SIZE,
532 .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
533 .chunksize = AEGIS_BLOCK_SIZE,
534
535 .base.cra_blocksize = 1,
536 .base.cra_ctxsize = sizeof(struct aegis_ctx),
537 .base.cra_alignmask = 0,
538 .base.cra_priority = 200,
539 .base.cra_name = "aegis128",
540 .base.cra_driver_name = "aegis128-simd",
541 .base.cra_module = THIS_MODULE,
542};
543
544static int __init crypto_aegis128_module_init(void)
545{
546 int ret;
547
548 ret = crypto_register_aead(&crypto_aegis128_alg_generic);
549 if (ret)
550 return ret;
551
552 if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
553 crypto_aegis128_have_simd()) {
554 ret = crypto_register_aead(&crypto_aegis128_alg_simd);
555 if (ret) {
556 crypto_unregister_aead(&crypto_aegis128_alg_generic);
557 return ret;
558 }
559 static_branch_enable(&have_simd);
560 }
561 return 0;
562}
563
564static void __exit crypto_aegis128_module_exit(void)
565{
566 if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
567 crypto_aegis128_have_simd())
568 crypto_unregister_aead(&crypto_aegis128_alg_simd);
569
570 crypto_unregister_aead(&crypto_aegis128_alg_generic);
571}
572
573subsys_initcall(crypto_aegis128_module_init);
574module_exit(crypto_aegis128_module_exit);
575
576MODULE_LICENSE("GPL");
577MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
578MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
579MODULE_ALIAS_CRYPTO("aegis128");
580MODULE_ALIAS_CRYPTO("aegis128-generic");
581MODULE_ALIAS_CRYPTO("aegis128-simd");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * The AEGIS-128 Authenticated-Encryption Algorithm
4 *
5 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
6 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
7 */
8
9#include <crypto/algapi.h>
10#include <crypto/internal/aead.h>
11#include <crypto/internal/simd.h>
12#include <crypto/internal/skcipher.h>
13#include <crypto/scatterwalk.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/jump_label.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/scatterlist.h>
20
21#include <asm/simd.h>
22
23#include "aegis.h"
24
25#define AEGIS128_NONCE_SIZE 16
26#define AEGIS128_STATE_BLOCKS 5
27#define AEGIS128_KEY_SIZE 16
28#define AEGIS128_MIN_AUTH_SIZE 8
29#define AEGIS128_MAX_AUTH_SIZE 16
30
31struct aegis_state {
32 union aegis_block blocks[AEGIS128_STATE_BLOCKS];
33};
34
35struct aegis_ctx {
36 union aegis_block key;
37};
38
39static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);
40
41static const union aegis_block crypto_aegis_const[2] = {
42 { .words64 = {
43 cpu_to_le64(U64_C(0x0d08050302010100)),
44 cpu_to_le64(U64_C(0x6279e99059372215)),
45 } },
46 { .words64 = {
47 cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
48 cpu_to_le64(U64_C(0xdd28b57342311120)),
49 } },
50};
51
52static bool aegis128_do_simd(void)
53{
54#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
55 if (static_branch_likely(&have_simd))
56 return crypto_simd_usable();
57#endif
58 return false;
59}
60
61bool crypto_aegis128_have_simd(void);
62void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
63void crypto_aegis128_init_simd(struct aegis_state *state,
64 const union aegis_block *key,
65 const u8 *iv);
66void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
67 const u8 *src, unsigned int size);
68void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
69 const u8 *src, unsigned int size);
70void crypto_aegis128_final_simd(struct aegis_state *state,
71 union aegis_block *tag_xor,
72 u64 assoclen, u64 cryptlen);
73
74static void crypto_aegis128_update(struct aegis_state *state)
75{
76 union aegis_block tmp;
77 unsigned int i;
78
79 tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
80 for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
81 crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
82 &state->blocks[i]);
83 crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
84}
85
86static void crypto_aegis128_update_a(struct aegis_state *state,
87 const union aegis_block *msg)
88{
89 if (aegis128_do_simd()) {
90 crypto_aegis128_update_simd(state, msg);
91 return;
92 }
93
94 crypto_aegis128_update(state);
95 crypto_aegis_block_xor(&state->blocks[0], msg);
96}
97
98static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg)
99{
100 if (aegis128_do_simd()) {
101 crypto_aegis128_update_simd(state, msg);
102 return;
103 }
104
105 crypto_aegis128_update(state);
106 crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
107}
108
109static void crypto_aegis128_init(struct aegis_state *state,
110 const union aegis_block *key,
111 const u8 *iv)
112{
113 union aegis_block key_iv;
114 unsigned int i;
115
116 key_iv = *key;
117 crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
118
119 state->blocks[0] = key_iv;
120 state->blocks[1] = crypto_aegis_const[1];
121 state->blocks[2] = crypto_aegis_const[0];
122 state->blocks[3] = *key;
123 state->blocks[4] = *key;
124
125 crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
126 crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
127
128 for (i = 0; i < 5; i++) {
129 crypto_aegis128_update_a(state, key);
130 crypto_aegis128_update_a(state, &key_iv);
131 }
132}
133
134static void crypto_aegis128_ad(struct aegis_state *state,
135 const u8 *src, unsigned int size)
136{
137 if (AEGIS_ALIGNED(src)) {
138 const union aegis_block *src_blk =
139 (const union aegis_block *)src;
140
141 while (size >= AEGIS_BLOCK_SIZE) {
142 crypto_aegis128_update_a(state, src_blk);
143
144 size -= AEGIS_BLOCK_SIZE;
145 src_blk++;
146 }
147 } else {
148 while (size >= AEGIS_BLOCK_SIZE) {
149 crypto_aegis128_update_u(state, src);
150
151 size -= AEGIS_BLOCK_SIZE;
152 src += AEGIS_BLOCK_SIZE;
153 }
154 }
155}
156
157static void crypto_aegis128_encrypt_chunk(struct aegis_state *state, u8 *dst,
158 const u8 *src, unsigned int size)
159{
160 union aegis_block tmp;
161
162 if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
163 while (size >= AEGIS_BLOCK_SIZE) {
164 union aegis_block *dst_blk =
165 (union aegis_block *)dst;
166 const union aegis_block *src_blk =
167 (const union aegis_block *)src;
168
169 tmp = state->blocks[2];
170 crypto_aegis_block_and(&tmp, &state->blocks[3]);
171 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
172 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
173 crypto_aegis_block_xor(&tmp, src_blk);
174
175 crypto_aegis128_update_a(state, src_blk);
176
177 *dst_blk = tmp;
178
179 size -= AEGIS_BLOCK_SIZE;
180 src += AEGIS_BLOCK_SIZE;
181 dst += AEGIS_BLOCK_SIZE;
182 }
183 } else {
184 while (size >= AEGIS_BLOCK_SIZE) {
185 tmp = state->blocks[2];
186 crypto_aegis_block_and(&tmp, &state->blocks[3]);
187 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
188 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
189 crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
190
191 crypto_aegis128_update_u(state, src);
192
193 memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
194
195 size -= AEGIS_BLOCK_SIZE;
196 src += AEGIS_BLOCK_SIZE;
197 dst += AEGIS_BLOCK_SIZE;
198 }
199 }
200
201 if (size > 0) {
202 union aegis_block msg = {};
203 memcpy(msg.bytes, src, size);
204
205 tmp = state->blocks[2];
206 crypto_aegis_block_and(&tmp, &state->blocks[3]);
207 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
208 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
209
210 crypto_aegis128_update_a(state, &msg);
211
212 crypto_aegis_block_xor(&msg, &tmp);
213
214 memcpy(dst, msg.bytes, size);
215 }
216}
217
218static void crypto_aegis128_decrypt_chunk(struct aegis_state *state, u8 *dst,
219 const u8 *src, unsigned int size)
220{
221 union aegis_block tmp;
222
223 if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
224 while (size >= AEGIS_BLOCK_SIZE) {
225 union aegis_block *dst_blk =
226 (union aegis_block *)dst;
227 const union aegis_block *src_blk =
228 (const union aegis_block *)src;
229
230 tmp = state->blocks[2];
231 crypto_aegis_block_and(&tmp, &state->blocks[3]);
232 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
233 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
234 crypto_aegis_block_xor(&tmp, src_blk);
235
236 crypto_aegis128_update_a(state, &tmp);
237
238 *dst_blk = tmp;
239
240 size -= AEGIS_BLOCK_SIZE;
241 src += AEGIS_BLOCK_SIZE;
242 dst += AEGIS_BLOCK_SIZE;
243 }
244 } else {
245 while (size >= AEGIS_BLOCK_SIZE) {
246 tmp = state->blocks[2];
247 crypto_aegis_block_and(&tmp, &state->blocks[3]);
248 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
249 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
250 crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
251
252 crypto_aegis128_update_a(state, &tmp);
253
254 memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
255
256 size -= AEGIS_BLOCK_SIZE;
257 src += AEGIS_BLOCK_SIZE;
258 dst += AEGIS_BLOCK_SIZE;
259 }
260 }
261
262 if (size > 0) {
263 union aegis_block msg = {};
264 memcpy(msg.bytes, src, size);
265
266 tmp = state->blocks[2];
267 crypto_aegis_block_and(&tmp, &state->blocks[3]);
268 crypto_aegis_block_xor(&tmp, &state->blocks[4]);
269 crypto_aegis_block_xor(&tmp, &state->blocks[1]);
270 crypto_aegis_block_xor(&msg, &tmp);
271
272 memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
273
274 crypto_aegis128_update_a(state, &msg);
275
276 memcpy(dst, msg.bytes, size);
277 }
278}
279
280static void crypto_aegis128_process_ad(struct aegis_state *state,
281 struct scatterlist *sg_src,
282 unsigned int assoclen)
283{
284 struct scatter_walk walk;
285 union aegis_block buf;
286 unsigned int pos = 0;
287
288 scatterwalk_start(&walk, sg_src);
289 while (assoclen != 0) {
290 unsigned int size = scatterwalk_clamp(&walk, assoclen);
291 unsigned int left = size;
292 void *mapped = scatterwalk_map(&walk);
293 const u8 *src = (const u8 *)mapped;
294
295 if (pos + size >= AEGIS_BLOCK_SIZE) {
296 if (pos > 0) {
297 unsigned int fill = AEGIS_BLOCK_SIZE - pos;
298 memcpy(buf.bytes + pos, src, fill);
299 crypto_aegis128_update_a(state, &buf);
300 pos = 0;
301 left -= fill;
302 src += fill;
303 }
304
305 crypto_aegis128_ad(state, src, left);
306 src += left & ~(AEGIS_BLOCK_SIZE - 1);
307 left &= AEGIS_BLOCK_SIZE - 1;
308 }
309
310 memcpy(buf.bytes + pos, src, left);
311
312 pos += left;
313 assoclen -= size;
314 scatterwalk_unmap(mapped);
315 scatterwalk_advance(&walk, size);
316 scatterwalk_done(&walk, 0, assoclen);
317 }
318
319 if (pos > 0) {
320 memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
321 crypto_aegis128_update_a(state, &buf);
322 }
323}
324
325static __always_inline
326int crypto_aegis128_process_crypt(struct aegis_state *state,
327 struct aead_request *req,
328 struct skcipher_walk *walk,
329 void (*crypt)(struct aegis_state *state,
330 u8 *dst, const u8 *src,
331 unsigned int size))
332{
333 int err = 0;
334
335 while (walk->nbytes) {
336 unsigned int nbytes = walk->nbytes;
337
338 if (nbytes < walk->total)
339 nbytes = round_down(nbytes, walk->stride);
340
341 crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
342
343 err = skcipher_walk_done(walk, walk->nbytes - nbytes);
344 }
345 return err;
346}
347
348static void crypto_aegis128_final(struct aegis_state *state,
349 union aegis_block *tag_xor,
350 u64 assoclen, u64 cryptlen)
351{
352 u64 assocbits = assoclen * 8;
353 u64 cryptbits = cryptlen * 8;
354
355 union aegis_block tmp;
356 unsigned int i;
357
358 tmp.words64[0] = cpu_to_le64(assocbits);
359 tmp.words64[1] = cpu_to_le64(cryptbits);
360
361 crypto_aegis_block_xor(&tmp, &state->blocks[3]);
362
363 for (i = 0; i < 7; i++)
364 crypto_aegis128_update_a(state, &tmp);
365
366 for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
367 crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
368}
369
370static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key,
371 unsigned int keylen)
372{
373 struct aegis_ctx *ctx = crypto_aead_ctx(aead);
374
375 if (keylen != AEGIS128_KEY_SIZE)
376 return -EINVAL;
377
378 memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
379 return 0;
380}
381
382static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
383 unsigned int authsize)
384{
385 if (authsize > AEGIS128_MAX_AUTH_SIZE)
386 return -EINVAL;
387 if (authsize < AEGIS128_MIN_AUTH_SIZE)
388 return -EINVAL;
389 return 0;
390}
391
392static int crypto_aegis128_encrypt(struct aead_request *req)
393{
394 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
395 union aegis_block tag = {};
396 unsigned int authsize = crypto_aead_authsize(tfm);
397 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
398 unsigned int cryptlen = req->cryptlen;
399 struct skcipher_walk walk;
400 struct aegis_state state;
401
402 skcipher_walk_aead_encrypt(&walk, req, false);
403 if (aegis128_do_simd()) {
404 crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
405 crypto_aegis128_process_ad(&state, req->src, req->assoclen);
406 crypto_aegis128_process_crypt(&state, req, &walk,
407 crypto_aegis128_encrypt_chunk_simd);
408 crypto_aegis128_final_simd(&state, &tag, req->assoclen,
409 cryptlen);
410 } else {
411 crypto_aegis128_init(&state, &ctx->key, req->iv);
412 crypto_aegis128_process_ad(&state, req->src, req->assoclen);
413 crypto_aegis128_process_crypt(&state, req, &walk,
414 crypto_aegis128_encrypt_chunk);
415 crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
416 }
417
418 scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
419 authsize, 1);
420 return 0;
421}
422
423static int crypto_aegis128_decrypt(struct aead_request *req)
424{
425 static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
426 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
427 union aegis_block tag;
428 unsigned int authsize = crypto_aead_authsize(tfm);
429 unsigned int cryptlen = req->cryptlen - authsize;
430 struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
431 struct skcipher_walk walk;
432 struct aegis_state state;
433
434 scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
435 authsize, 0);
436
437 skcipher_walk_aead_decrypt(&walk, req, false);
438 if (aegis128_do_simd()) {
439 crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
440 crypto_aegis128_process_ad(&state, req->src, req->assoclen);
441 crypto_aegis128_process_crypt(&state, req, &walk,
442 crypto_aegis128_decrypt_chunk_simd);
443 crypto_aegis128_final_simd(&state, &tag, req->assoclen,
444 cryptlen);
445 } else {
446 crypto_aegis128_init(&state, &ctx->key, req->iv);
447 crypto_aegis128_process_ad(&state, req->src, req->assoclen);
448 crypto_aegis128_process_crypt(&state, req, &walk,
449 crypto_aegis128_decrypt_chunk);
450 crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
451 }
452
453 return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
454}
455
456static struct aead_alg crypto_aegis128_alg = {
457 .setkey = crypto_aegis128_setkey,
458 .setauthsize = crypto_aegis128_setauthsize,
459 .encrypt = crypto_aegis128_encrypt,
460 .decrypt = crypto_aegis128_decrypt,
461
462 .ivsize = AEGIS128_NONCE_SIZE,
463 .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
464 .chunksize = AEGIS_BLOCK_SIZE,
465
466 .base = {
467 .cra_blocksize = 1,
468 .cra_ctxsize = sizeof(struct aegis_ctx),
469 .cra_alignmask = 0,
470
471 .cra_priority = 100,
472
473 .cra_name = "aegis128",
474 .cra_driver_name = "aegis128-generic",
475
476 .cra_module = THIS_MODULE,
477 }
478};
479
480static int __init crypto_aegis128_module_init(void)
481{
482 if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
483 crypto_aegis128_have_simd())
484 static_branch_enable(&have_simd);
485
486 return crypto_register_aead(&crypto_aegis128_alg);
487}
488
489static void __exit crypto_aegis128_module_exit(void)
490{
491 crypto_unregister_aead(&crypto_aegis128_alg);
492}
493
494subsys_initcall(crypto_aegis128_module_init);
495module_exit(crypto_aegis128_module_exit);
496
497MODULE_LICENSE("GPL");
498MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
499MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
500MODULE_ALIAS_CRYPTO("aegis128");
501MODULE_ALIAS_CRYPTO("aegis128-generic");