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747bd2a3 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
396be41f OM |
2 | /* |
3 | * The MORUS-640 Authenticated-Encryption Algorithm | |
4 | * | |
5 | * Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com> | |
6 | * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. | |
396be41f OM |
7 | */ |
8 | ||
9 | #include <asm/unaligned.h> | |
10 | #include <crypto/algapi.h> | |
11 | #include <crypto/internal/aead.h> | |
12 | #include <crypto/internal/skcipher.h> | |
13 | #include <crypto/morus_common.h> | |
14 | #include <crypto/scatterwalk.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/scatterlist.h> | |
20 | ||
21 | #define MORUS640_WORD_SIZE 4 | |
22 | #define MORUS640_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS640_WORD_SIZE) | |
23 | #define MORUS640_BLOCK_ALIGN (__alignof__(__le32)) | |
24 | #define MORUS640_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS640_BLOCK_ALIGN) | |
25 | ||
26 | struct morus640_block { | |
27 | u32 words[MORUS_BLOCK_WORDS]; | |
28 | }; | |
29 | ||
30 | union morus640_block_in { | |
31 | __le32 words[MORUS_BLOCK_WORDS]; | |
32 | u8 bytes[MORUS640_BLOCK_SIZE]; | |
33 | }; | |
34 | ||
35 | struct morus640_state { | |
36 | struct morus640_block s[MORUS_STATE_BLOCKS]; | |
37 | }; | |
38 | ||
39 | struct morus640_ctx { | |
40 | struct morus640_block key; | |
41 | }; | |
42 | ||
43 | struct morus640_ops { | |
44 | int (*skcipher_walk_init)(struct skcipher_walk *walk, | |
45 | struct aead_request *req, bool atomic); | |
46 | ||
47 | void (*crypt_chunk)(struct morus640_state *state, | |
48 | u8 *dst, const u8 *src, unsigned int size); | |
49 | }; | |
50 | ||
51 | static const struct morus640_block crypto_morus640_const[2] = { | |
52 | { .words = { | |
53 | U32_C(0x02010100), | |
54 | U32_C(0x0d080503), | |
55 | U32_C(0x59372215), | |
56 | U32_C(0x6279e990), | |
57 | } }, | |
58 | { .words = { | |
59 | U32_C(0x55183ddb), | |
60 | U32_C(0xf12fc26d), | |
61 | U32_C(0x42311120), | |
62 | U32_C(0xdd28b573), | |
63 | } }, | |
64 | }; | |
65 | ||
66 | static void crypto_morus640_round(struct morus640_block *b0, | |
67 | struct morus640_block *b1, | |
68 | struct morus640_block *b2, | |
69 | struct morus640_block *b3, | |
70 | struct morus640_block *b4, | |
71 | const struct morus640_block *m, | |
72 | unsigned int b, unsigned int w) | |
73 | { | |
74 | unsigned int i; | |
75 | struct morus640_block tmp; | |
76 | ||
77 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
78 | b0->words[i] ^= b1->words[i] & b2->words[i]; | |
79 | b0->words[i] ^= b3->words[i]; | |
80 | b0->words[i] ^= m->words[i]; | |
81 | b0->words[i] = rol32(b0->words[i], b); | |
82 | } | |
83 | ||
84 | tmp = *b3; | |
85 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) | |
86 | b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i]; | |
87 | } | |
88 | ||
89 | static void crypto_morus640_update(struct morus640_state *state, | |
90 | const struct morus640_block *m) | |
91 | { | |
92 | static const struct morus640_block z = {}; | |
93 | ||
94 | struct morus640_block *s = state->s; | |
95 | ||
96 | crypto_morus640_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 5, 1); | |
97 | crypto_morus640_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 31, 2); | |
98 | crypto_morus640_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 7, 3); | |
99 | crypto_morus640_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 22, 2); | |
100 | crypto_morus640_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 13, 1); | |
101 | } | |
102 | ||
103 | static void crypto_morus640_load_a(struct morus640_block *dst, const u8 *src) | |
104 | { | |
105 | unsigned int i; | |
106 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
107 | dst->words[i] = le32_to_cpu(*(const __le32 *)src); | |
108 | src += MORUS640_WORD_SIZE; | |
109 | } | |
110 | } | |
111 | ||
112 | static void crypto_morus640_load_u(struct morus640_block *dst, const u8 *src) | |
113 | { | |
114 | unsigned int i; | |
115 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
116 | dst->words[i] = get_unaligned_le32(src); | |
117 | src += MORUS640_WORD_SIZE; | |
118 | } | |
119 | } | |
120 | ||
121 | static void crypto_morus640_load(struct morus640_block *dst, const u8 *src) | |
122 | { | |
123 | if (MORUS640_ALIGNED(src)) | |
124 | crypto_morus640_load_a(dst, src); | |
125 | else | |
126 | crypto_morus640_load_u(dst, src); | |
127 | } | |
128 | ||
129 | static void crypto_morus640_store_a(u8 *dst, const struct morus640_block *src) | |
130 | { | |
131 | unsigned int i; | |
132 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
133 | *(__le32 *)dst = cpu_to_le32(src->words[i]); | |
134 | dst += MORUS640_WORD_SIZE; | |
135 | } | |
136 | } | |
137 | ||
138 | static void crypto_morus640_store_u(u8 *dst, const struct morus640_block *src) | |
139 | { | |
140 | unsigned int i; | |
141 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
142 | put_unaligned_le32(src->words[i], dst); | |
143 | dst += MORUS640_WORD_SIZE; | |
144 | } | |
145 | } | |
146 | ||
147 | static void crypto_morus640_store(u8 *dst, const struct morus640_block *src) | |
148 | { | |
149 | if (MORUS640_ALIGNED(dst)) | |
150 | crypto_morus640_store_a(dst, src); | |
151 | else | |
152 | crypto_morus640_store_u(dst, src); | |
153 | } | |
154 | ||
155 | static void crypto_morus640_ad(struct morus640_state *state, const u8 *src, | |
156 | unsigned int size) | |
157 | { | |
158 | struct morus640_block m; | |
159 | ||
160 | if (MORUS640_ALIGNED(src)) { | |
161 | while (size >= MORUS640_BLOCK_SIZE) { | |
162 | crypto_morus640_load_a(&m, src); | |
163 | crypto_morus640_update(state, &m); | |
164 | ||
165 | size -= MORUS640_BLOCK_SIZE; | |
166 | src += MORUS640_BLOCK_SIZE; | |
167 | } | |
168 | } else { | |
169 | while (size >= MORUS640_BLOCK_SIZE) { | |
170 | crypto_morus640_load_u(&m, src); | |
171 | crypto_morus640_update(state, &m); | |
172 | ||
173 | size -= MORUS640_BLOCK_SIZE; | |
174 | src += MORUS640_BLOCK_SIZE; | |
175 | } | |
176 | } | |
177 | } | |
178 | ||
179 | static void crypto_morus640_core(const struct morus640_state *state, | |
180 | struct morus640_block *blk) | |
181 | { | |
182 | unsigned int i; | |
183 | ||
184 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) | |
185 | blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i]; | |
186 | ||
187 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) { | |
188 | blk->words[i] ^= state->s[0].words[i]; | |
189 | blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i]; | |
190 | } | |
191 | } | |
192 | ||
193 | static void crypto_morus640_encrypt_chunk(struct morus640_state *state, u8 *dst, | |
194 | const u8 *src, unsigned int size) | |
195 | { | |
196 | struct morus640_block c, m; | |
197 | ||
198 | if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) { | |
199 | while (size >= MORUS640_BLOCK_SIZE) { | |
200 | crypto_morus640_load_a(&m, src); | |
201 | c = m; | |
202 | crypto_morus640_core(state, &c); | |
203 | crypto_morus640_store_a(dst, &c); | |
204 | crypto_morus640_update(state, &m); | |
205 | ||
206 | src += MORUS640_BLOCK_SIZE; | |
207 | dst += MORUS640_BLOCK_SIZE; | |
208 | size -= MORUS640_BLOCK_SIZE; | |
209 | } | |
210 | } else { | |
211 | while (size >= MORUS640_BLOCK_SIZE) { | |
212 | crypto_morus640_load_u(&m, src); | |
213 | c = m; | |
214 | crypto_morus640_core(state, &c); | |
215 | crypto_morus640_store_u(dst, &c); | |
216 | crypto_morus640_update(state, &m); | |
217 | ||
218 | src += MORUS640_BLOCK_SIZE; | |
219 | dst += MORUS640_BLOCK_SIZE; | |
220 | size -= MORUS640_BLOCK_SIZE; | |
221 | } | |
222 | } | |
223 | ||
224 | if (size > 0) { | |
225 | union morus640_block_in tail; | |
226 | ||
227 | memcpy(tail.bytes, src, size); | |
228 | memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size); | |
229 | ||
230 | crypto_morus640_load_a(&m, tail.bytes); | |
231 | c = m; | |
232 | crypto_morus640_core(state, &c); | |
233 | crypto_morus640_store_a(tail.bytes, &c); | |
234 | crypto_morus640_update(state, &m); | |
235 | ||
236 | memcpy(dst, tail.bytes, size); | |
237 | } | |
238 | } | |
239 | ||
240 | static void crypto_morus640_decrypt_chunk(struct morus640_state *state, u8 *dst, | |
241 | const u8 *src, unsigned int size) | |
242 | { | |
243 | struct morus640_block m; | |
244 | ||
245 | if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) { | |
246 | while (size >= MORUS640_BLOCK_SIZE) { | |
247 | crypto_morus640_load_a(&m, src); | |
248 | crypto_morus640_core(state, &m); | |
249 | crypto_morus640_store_a(dst, &m); | |
250 | crypto_morus640_update(state, &m); | |
251 | ||
252 | src += MORUS640_BLOCK_SIZE; | |
253 | dst += MORUS640_BLOCK_SIZE; | |
254 | size -= MORUS640_BLOCK_SIZE; | |
255 | } | |
256 | } else { | |
257 | while (size >= MORUS640_BLOCK_SIZE) { | |
258 | crypto_morus640_load_u(&m, src); | |
259 | crypto_morus640_core(state, &m); | |
260 | crypto_morus640_store_u(dst, &m); | |
261 | crypto_morus640_update(state, &m); | |
262 | ||
263 | src += MORUS640_BLOCK_SIZE; | |
264 | dst += MORUS640_BLOCK_SIZE; | |
265 | size -= MORUS640_BLOCK_SIZE; | |
266 | } | |
267 | } | |
268 | ||
269 | if (size > 0) { | |
270 | union morus640_block_in tail; | |
271 | ||
272 | memcpy(tail.bytes, src, size); | |
a81ae809 | 273 | memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size); |
396be41f | 274 | |
a81ae809 | 275 | crypto_morus640_load_a(&m, tail.bytes); |
396be41f OM |
276 | crypto_morus640_core(state, &m); |
277 | crypto_morus640_store_a(tail.bytes, &m); | |
278 | memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size); | |
279 | crypto_morus640_load_a(&m, tail.bytes); | |
280 | crypto_morus640_update(state, &m); | |
281 | ||
282 | memcpy(dst, tail.bytes, size); | |
283 | } | |
284 | } | |
285 | ||
286 | static void crypto_morus640_init(struct morus640_state *state, | |
287 | const struct morus640_block *key, | |
288 | const u8 *iv) | |
289 | { | |
290 | static const struct morus640_block z = {}; | |
291 | ||
292 | unsigned int i; | |
293 | ||
294 | crypto_morus640_load(&state->s[0], iv); | |
295 | state->s[1] = *key; | |
296 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) | |
297 | state->s[2].words[i] = U32_C(0xFFFFFFFF); | |
298 | state->s[3] = crypto_morus640_const[0]; | |
299 | state->s[4] = crypto_morus640_const[1]; | |
300 | ||
301 | for (i = 0; i < 16; i++) | |
302 | crypto_morus640_update(state, &z); | |
303 | ||
304 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) | |
305 | state->s[1].words[i] ^= key->words[i]; | |
306 | } | |
307 | ||
308 | static void crypto_morus640_process_ad(struct morus640_state *state, | |
309 | struct scatterlist *sg_src, | |
310 | unsigned int assoclen) | |
311 | { | |
312 | struct scatter_walk walk; | |
313 | struct morus640_block m; | |
314 | union morus640_block_in buf; | |
315 | unsigned int pos = 0; | |
316 | ||
317 | scatterwalk_start(&walk, sg_src); | |
318 | while (assoclen != 0) { | |
319 | unsigned int size = scatterwalk_clamp(&walk, assoclen); | |
320 | unsigned int left = size; | |
321 | void *mapped = scatterwalk_map(&walk); | |
322 | const u8 *src = (const u8 *)mapped; | |
323 | ||
324 | if (pos + size >= MORUS640_BLOCK_SIZE) { | |
325 | if (pos > 0) { | |
326 | unsigned int fill = MORUS640_BLOCK_SIZE - pos; | |
327 | memcpy(buf.bytes + pos, src, fill); | |
328 | ||
329 | crypto_morus640_load_a(&m, buf.bytes); | |
330 | crypto_morus640_update(state, &m); | |
331 | ||
332 | pos = 0; | |
333 | left -= fill; | |
334 | src += fill; | |
335 | } | |
336 | ||
337 | crypto_morus640_ad(state, src, left); | |
338 | src += left & ~(MORUS640_BLOCK_SIZE - 1); | |
339 | left &= MORUS640_BLOCK_SIZE - 1; | |
340 | } | |
341 | ||
342 | memcpy(buf.bytes + pos, src, left); | |
343 | ||
344 | pos += left; | |
345 | assoclen -= size; | |
346 | scatterwalk_unmap(mapped); | |
347 | scatterwalk_advance(&walk, size); | |
348 | scatterwalk_done(&walk, 0, assoclen); | |
349 | } | |
350 | ||
351 | if (pos > 0) { | |
352 | memset(buf.bytes + pos, 0, MORUS640_BLOCK_SIZE - pos); | |
353 | ||
354 | crypto_morus640_load_a(&m, buf.bytes); | |
355 | crypto_morus640_update(state, &m); | |
356 | } | |
357 | } | |
358 | ||
359 | static void crypto_morus640_process_crypt(struct morus640_state *state, | |
360 | struct aead_request *req, | |
361 | const struct morus640_ops *ops) | |
362 | { | |
363 | struct skcipher_walk walk; | |
396be41f OM |
364 | |
365 | ops->skcipher_walk_init(&walk, req, false); | |
366 | ||
367 | while (walk.nbytes) { | |
d644f1c8 | 368 | unsigned int nbytes = walk.nbytes; |
396be41f | 369 | |
d644f1c8 EB |
370 | if (nbytes < walk.total) |
371 | nbytes = round_down(nbytes, walk.stride); | |
396be41f | 372 | |
d644f1c8 EB |
373 | ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr, |
374 | nbytes); | |
375 | ||
376 | skcipher_walk_done(&walk, walk.nbytes - nbytes); | |
396be41f OM |
377 | } |
378 | } | |
379 | ||
380 | static void crypto_morus640_final(struct morus640_state *state, | |
381 | struct morus640_block *tag_xor, | |
382 | u64 assoclen, u64 cryptlen) | |
383 | { | |
396be41f OM |
384 | struct morus640_block tmp; |
385 | unsigned int i; | |
386 | ||
5a8dedfa AB |
387 | tmp.words[0] = lower_32_bits(assoclen * 8); |
388 | tmp.words[1] = upper_32_bits(assoclen * 8); | |
389 | tmp.words[2] = lower_32_bits(cryptlen * 8); | |
390 | tmp.words[3] = upper_32_bits(cryptlen * 8); | |
396be41f OM |
391 | |
392 | for (i = 0; i < MORUS_BLOCK_WORDS; i++) | |
393 | state->s[4].words[i] ^= state->s[0].words[i]; | |
394 | ||
395 | for (i = 0; i < 10; i++) | |
396 | crypto_morus640_update(state, &tmp); | |
397 | ||
398 | crypto_morus640_core(state, tag_xor); | |
399 | } | |
400 | ||
401 | static int crypto_morus640_setkey(struct crypto_aead *aead, const u8 *key, | |
402 | unsigned int keylen) | |
403 | { | |
404 | struct morus640_ctx *ctx = crypto_aead_ctx(aead); | |
405 | ||
406 | if (keylen != MORUS640_BLOCK_SIZE) { | |
407 | crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
408 | return -EINVAL; | |
409 | } | |
410 | ||
411 | crypto_morus640_load(&ctx->key, key); | |
412 | return 0; | |
413 | } | |
414 | ||
415 | static int crypto_morus640_setauthsize(struct crypto_aead *tfm, | |
416 | unsigned int authsize) | |
417 | { | |
418 | return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL; | |
419 | } | |
420 | ||
421 | static void crypto_morus640_crypt(struct aead_request *req, | |
422 | struct morus640_block *tag_xor, | |
423 | unsigned int cryptlen, | |
424 | const struct morus640_ops *ops) | |
425 | { | |
426 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
427 | struct morus640_ctx *ctx = crypto_aead_ctx(tfm); | |
428 | struct morus640_state state; | |
429 | ||
430 | crypto_morus640_init(&state, &ctx->key, req->iv); | |
431 | crypto_morus640_process_ad(&state, req->src, req->assoclen); | |
432 | crypto_morus640_process_crypt(&state, req, ops); | |
433 | crypto_morus640_final(&state, tag_xor, req->assoclen, cryptlen); | |
434 | } | |
435 | ||
436 | static int crypto_morus640_encrypt(struct aead_request *req) | |
437 | { | |
438 | static const struct morus640_ops ops = { | |
439 | .skcipher_walk_init = skcipher_walk_aead_encrypt, | |
440 | .crypt_chunk = crypto_morus640_encrypt_chunk, | |
441 | }; | |
442 | ||
443 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
444 | struct morus640_block tag = {}; | |
445 | union morus640_block_in tag_out; | |
446 | unsigned int authsize = crypto_aead_authsize(tfm); | |
447 | unsigned int cryptlen = req->cryptlen; | |
448 | ||
449 | crypto_morus640_crypt(req, &tag, cryptlen, &ops); | |
450 | crypto_morus640_store(tag_out.bytes, &tag); | |
451 | ||
452 | scatterwalk_map_and_copy(tag_out.bytes, req->dst, | |
453 | req->assoclen + cryptlen, authsize, 1); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static int crypto_morus640_decrypt(struct aead_request *req) | |
458 | { | |
459 | static const struct morus640_ops ops = { | |
460 | .skcipher_walk_init = skcipher_walk_aead_decrypt, | |
461 | .crypt_chunk = crypto_morus640_decrypt_chunk, | |
462 | }; | |
463 | static const u8 zeros[MORUS640_BLOCK_SIZE] = {}; | |
464 | ||
465 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
466 | union morus640_block_in tag_in; | |
467 | struct morus640_block tag; | |
468 | unsigned int authsize = crypto_aead_authsize(tfm); | |
469 | unsigned int cryptlen = req->cryptlen - authsize; | |
470 | ||
471 | scatterwalk_map_and_copy(tag_in.bytes, req->src, | |
472 | req->assoclen + cryptlen, authsize, 0); | |
473 | ||
474 | crypto_morus640_load(&tag, tag_in.bytes); | |
475 | crypto_morus640_crypt(req, &tag, cryptlen, &ops); | |
476 | crypto_morus640_store(tag_in.bytes, &tag); | |
477 | ||
478 | return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0; | |
479 | } | |
480 | ||
481 | static int crypto_morus640_init_tfm(struct crypto_aead *tfm) | |
482 | { | |
483 | return 0; | |
484 | } | |
485 | ||
486 | static void crypto_morus640_exit_tfm(struct crypto_aead *tfm) | |
487 | { | |
488 | } | |
489 | ||
490 | static struct aead_alg crypto_morus640_alg = { | |
491 | .setkey = crypto_morus640_setkey, | |
492 | .setauthsize = crypto_morus640_setauthsize, | |
493 | .encrypt = crypto_morus640_encrypt, | |
494 | .decrypt = crypto_morus640_decrypt, | |
495 | .init = crypto_morus640_init_tfm, | |
496 | .exit = crypto_morus640_exit_tfm, | |
497 | ||
498 | .ivsize = MORUS_NONCE_SIZE, | |
499 | .maxauthsize = MORUS_MAX_AUTH_SIZE, | |
500 | .chunksize = MORUS640_BLOCK_SIZE, | |
501 | ||
502 | .base = { | |
396be41f OM |
503 | .cra_blocksize = 1, |
504 | .cra_ctxsize = sizeof(struct morus640_ctx), | |
505 | .cra_alignmask = 0, | |
506 | ||
507 | .cra_priority = 100, | |
508 | ||
509 | .cra_name = "morus640", | |
510 | .cra_driver_name = "morus640-generic", | |
511 | ||
512 | .cra_module = THIS_MODULE, | |
513 | } | |
514 | }; | |
515 | ||
516 | static int __init crypto_morus640_module_init(void) | |
517 | { | |
518 | return crypto_register_aead(&crypto_morus640_alg); | |
519 | } | |
520 | ||
521 | static void __exit crypto_morus640_module_exit(void) | |
522 | { | |
523 | crypto_unregister_aead(&crypto_morus640_alg); | |
524 | } | |
525 | ||
c4741b23 | 526 | subsys_initcall(crypto_morus640_module_init); |
396be41f OM |
527 | module_exit(crypto_morus640_module_exit); |
528 | ||
529 | MODULE_LICENSE("GPL"); | |
530 | MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>"); | |
531 | MODULE_DESCRIPTION("MORUS-640 AEAD algorithm"); | |
532 | MODULE_ALIAS_CRYPTO("morus640"); | |
533 | MODULE_ALIAS_CRYPTO("morus640-generic"); |