1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * The MORUS-1280 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.
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 MORUS1280_WORD_SIZE 8
22#define MORUS1280_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS1280_WORD_SIZE)
23#define MORUS1280_BLOCK_ALIGN (__alignof__(__le64))
24#define MORUS1280_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS1280_BLOCK_ALIGN)
25
26struct morus1280_block {
27 u64 words[MORUS_BLOCK_WORDS];
28};
29
30union morus1280_block_in {
31 __le64 words[MORUS_BLOCK_WORDS];
32 u8 bytes[MORUS1280_BLOCK_SIZE];
33};
34
35struct morus1280_state {
36 struct morus1280_block s[MORUS_STATE_BLOCKS];
37};
38
39struct morus1280_ctx {
40 struct morus1280_block key;
41};
42
43struct morus1280_ops {
44 int (*skcipher_walk_init)(struct skcipher_walk *walk,
45 struct aead_request *req, bool atomic);
46
47 void (*crypt_chunk)(struct morus1280_state *state,
48 u8 *dst, const u8 *src, unsigned int size);
49};
50
51static const struct morus1280_block crypto_morus1280_const[1] = {
52 { .words = {
53 U64_C(0x0d08050302010100),
54 U64_C(0x6279e99059372215),
55 U64_C(0xf12fc26d55183ddb),
56 U64_C(0xdd28b57342311120),
57 } },
58};
59
60static void crypto_morus1280_round(struct morus1280_block *b0,
61 struct morus1280_block *b1,
62 struct morus1280_block *b2,
63 struct morus1280_block *b3,
64 struct morus1280_block *b4,
65 const struct morus1280_block *m,
66 unsigned int b, unsigned int w)
67{
68 unsigned int i;
69 struct morus1280_block tmp;
70
71 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
72 b0->words[i] ^= b1->words[i] & b2->words[i];
73 b0->words[i] ^= b3->words[i];
74 b0->words[i] ^= m->words[i];
75 b0->words[i] = rol64(b0->words[i], b);
76 }
77
78 tmp = *b3;
79 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
80 b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i];
81}
82
83static void crypto_morus1280_update(struct morus1280_state *state,
84 const struct morus1280_block *m)
85{
86 static const struct morus1280_block z = {};
87
88 struct morus1280_block *s = state->s;
89
90 crypto_morus1280_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 13, 1);
91 crypto_morus1280_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 46, 2);
92 crypto_morus1280_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 38, 3);
93 crypto_morus1280_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 7, 2);
94 crypto_morus1280_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 4, 1);
95}
96
97static void crypto_morus1280_load_a(struct morus1280_block *dst, const u8 *src)
98{
99 unsigned int i;
100 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
101 dst->words[i] = le64_to_cpu(*(const __le64 *)src);
102 src += MORUS1280_WORD_SIZE;
103 }
104}
105
106static void crypto_morus1280_load_u(struct morus1280_block *dst, const u8 *src)
107{
108 unsigned int i;
109 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
110 dst->words[i] = get_unaligned_le64(src);
111 src += MORUS1280_WORD_SIZE;
112 }
113}
114
115static void crypto_morus1280_load(struct morus1280_block *dst, const u8 *src)
116{
117 if (MORUS1280_ALIGNED(src))
118 crypto_morus1280_load_a(dst, src);
119 else
120 crypto_morus1280_load_u(dst, src);
121}
122
123static void crypto_morus1280_store_a(u8 *dst, const struct morus1280_block *src)
124{
125 unsigned int i;
126 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
127 *(__le64 *)dst = cpu_to_le64(src->words[i]);
128 dst += MORUS1280_WORD_SIZE;
129 }
130}
131
132static void crypto_morus1280_store_u(u8 *dst, const struct morus1280_block *src)
133{
134 unsigned int i;
135 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
136 put_unaligned_le64(src->words[i], dst);
137 dst += MORUS1280_WORD_SIZE;
138 }
139}
140
141static void crypto_morus1280_store(u8 *dst, const struct morus1280_block *src)
142{
143 if (MORUS1280_ALIGNED(dst))
144 crypto_morus1280_store_a(dst, src);
145 else
146 crypto_morus1280_store_u(dst, src);
147}
148
149static void crypto_morus1280_ad(struct morus1280_state *state, const u8 *src,
150 unsigned int size)
151{
152 struct morus1280_block m;
153
154 if (MORUS1280_ALIGNED(src)) {
155 while (size >= MORUS1280_BLOCK_SIZE) {
156 crypto_morus1280_load_a(&m, src);
157 crypto_morus1280_update(state, &m);
158
159 size -= MORUS1280_BLOCK_SIZE;
160 src += MORUS1280_BLOCK_SIZE;
161 }
162 } else {
163 while (size >= MORUS1280_BLOCK_SIZE) {
164 crypto_morus1280_load_u(&m, src);
165 crypto_morus1280_update(state, &m);
166
167 size -= MORUS1280_BLOCK_SIZE;
168 src += MORUS1280_BLOCK_SIZE;
169 }
170 }
171}
172
173static void crypto_morus1280_core(const struct morus1280_state *state,
174 struct morus1280_block *blk)
175{
176 unsigned int i;
177
178 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
179 blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i];
180
181 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
182 blk->words[i] ^= state->s[0].words[i];
183 blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i];
184 }
185}
186
187static void crypto_morus1280_encrypt_chunk(struct morus1280_state *state,
188 u8 *dst, const u8 *src,
189 unsigned int size)
190{
191 struct morus1280_block c, m;
192
193 if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
194 while (size >= MORUS1280_BLOCK_SIZE) {
195 crypto_morus1280_load_a(&m, src);
196 c = m;
197 crypto_morus1280_core(state, &c);
198 crypto_morus1280_store_a(dst, &c);
199 crypto_morus1280_update(state, &m);
200
201 src += MORUS1280_BLOCK_SIZE;
202 dst += MORUS1280_BLOCK_SIZE;
203 size -= MORUS1280_BLOCK_SIZE;
204 }
205 } else {
206 while (size >= MORUS1280_BLOCK_SIZE) {
207 crypto_morus1280_load_u(&m, src);
208 c = m;
209 crypto_morus1280_core(state, &c);
210 crypto_morus1280_store_u(dst, &c);
211 crypto_morus1280_update(state, &m);
212
213 src += MORUS1280_BLOCK_SIZE;
214 dst += MORUS1280_BLOCK_SIZE;
215 size -= MORUS1280_BLOCK_SIZE;
216 }
217 }
218
219 if (size > 0) {
220 union morus1280_block_in tail;
221
222 memcpy(tail.bytes, src, size);
223 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
224
225 crypto_morus1280_load_a(&m, tail.bytes);
226 c = m;
227 crypto_morus1280_core(state, &c);
228 crypto_morus1280_store_a(tail.bytes, &c);
229 crypto_morus1280_update(state, &m);
230
231 memcpy(dst, tail.bytes, size);
232 }
233}
234
235static void crypto_morus1280_decrypt_chunk(struct morus1280_state *state,
236 u8 *dst, const u8 *src,
237 unsigned int size)
238{
239 struct morus1280_block m;
240
241 if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
242 while (size >= MORUS1280_BLOCK_SIZE) {
243 crypto_morus1280_load_a(&m, src);
244 crypto_morus1280_core(state, &m);
245 crypto_morus1280_store_a(dst, &m);
246 crypto_morus1280_update(state, &m);
247
248 src += MORUS1280_BLOCK_SIZE;
249 dst += MORUS1280_BLOCK_SIZE;
250 size -= MORUS1280_BLOCK_SIZE;
251 }
252 } else {
253 while (size >= MORUS1280_BLOCK_SIZE) {
254 crypto_morus1280_load_u(&m, src);
255 crypto_morus1280_core(state, &m);
256 crypto_morus1280_store_u(dst, &m);
257 crypto_morus1280_update(state, &m);
258
259 src += MORUS1280_BLOCK_SIZE;
260 dst += MORUS1280_BLOCK_SIZE;
261 size -= MORUS1280_BLOCK_SIZE;
262 }
263 }
264
265 if (size > 0) {
266 union morus1280_block_in tail;
267
268 memcpy(tail.bytes, src, size);
269 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
270
271 crypto_morus1280_load_a(&m, tail.bytes);
272 crypto_morus1280_core(state, &m);
273 crypto_morus1280_store_a(tail.bytes, &m);
274 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
275 crypto_morus1280_load_a(&m, tail.bytes);
276 crypto_morus1280_update(state, &m);
277
278 memcpy(dst, tail.bytes, size);
279 }
280}
281
282static void crypto_morus1280_init(struct morus1280_state *state,
283 const struct morus1280_block *key,
284 const u8 *iv)
285{
286 static const struct morus1280_block z = {};
287
288 union morus1280_block_in tmp;
289 unsigned int i;
290
291 memcpy(tmp.bytes, iv, MORUS_NONCE_SIZE);
292 memset(tmp.bytes + MORUS_NONCE_SIZE, 0,
293 MORUS1280_BLOCK_SIZE - MORUS_NONCE_SIZE);
294
295 crypto_morus1280_load(&state->s[0], tmp.bytes);
296 state->s[1] = *key;
297 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
298 state->s[2].words[i] = U64_C(0xFFFFFFFFFFFFFFFF);
299 state->s[3] = z;
300 state->s[4] = crypto_morus1280_const[0];
301
302 for (i = 0; i < 16; i++)
303 crypto_morus1280_update(state, &z);
304
305 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
306 state->s[1].words[i] ^= key->words[i];
307}
308
309static void crypto_morus1280_process_ad(struct morus1280_state *state,
310 struct scatterlist *sg_src,
311 unsigned int assoclen)
312{
313 struct scatter_walk walk;
314 struct morus1280_block m;
315 union morus1280_block_in buf;
316 unsigned int pos = 0;
317
318 scatterwalk_start(&walk, sg_src);
319 while (assoclen != 0) {
320 unsigned int size = scatterwalk_clamp(&walk, assoclen);
321 unsigned int left = size;
322 void *mapped = scatterwalk_map(&walk);
323 const u8 *src = (const u8 *)mapped;
324
325 if (pos + size >= MORUS1280_BLOCK_SIZE) {
326 if (pos > 0) {
327 unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
328 memcpy(buf.bytes + pos, src, fill);
329
330 crypto_morus1280_load_a(&m, buf.bytes);
331 crypto_morus1280_update(state, &m);
332
333 pos = 0;
334 left -= fill;
335 src += fill;
336 }
337
338 crypto_morus1280_ad(state, src, left);
339 src += left & ~(MORUS1280_BLOCK_SIZE - 1);
340 left &= MORUS1280_BLOCK_SIZE - 1;
341 }
342
343 memcpy(buf.bytes + pos, src, left);
344
345 pos += left;
346 assoclen -= size;
347 scatterwalk_unmap(mapped);
348 scatterwalk_advance(&walk, size);
349 scatterwalk_done(&walk, 0, assoclen);
350 }
351
352 if (pos > 0) {
353 memset(buf.bytes + pos, 0, MORUS1280_BLOCK_SIZE - pos);
354
355 crypto_morus1280_load_a(&m, buf.bytes);
356 crypto_morus1280_update(state, &m);
357 }
358}
359
360static void crypto_morus1280_process_crypt(struct morus1280_state *state,
361 struct aead_request *req,
362 const struct morus1280_ops *ops)
363{
364 struct skcipher_walk walk;
365
366 ops->skcipher_walk_init(&walk, req, false);
367
368 while (walk.nbytes) {
369 unsigned int nbytes = walk.nbytes;
370
371 if (nbytes < walk.total)
372 nbytes = round_down(nbytes, walk.stride);
373
374 ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
375 nbytes);
376
377 skcipher_walk_done(&walk, walk.nbytes - nbytes);
378 }
379}
380
381static void crypto_morus1280_final(struct morus1280_state *state,
382 struct morus1280_block *tag_xor,
383 u64 assoclen, u64 cryptlen)
384{
385 struct morus1280_block tmp;
386 unsigned int i;
387
388 tmp.words[0] = assoclen * 8;
389 tmp.words[1] = cryptlen * 8;
390 tmp.words[2] = 0;
391 tmp.words[3] = 0;
392
393 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
394 state->s[4].words[i] ^= state->s[0].words[i];
395
396 for (i = 0; i < 10; i++)
397 crypto_morus1280_update(state, &tmp);
398
399 crypto_morus1280_core(state, tag_xor);
400}
401
402static int crypto_morus1280_setkey(struct crypto_aead *aead, const u8 *key,
403 unsigned int keylen)
404{
405 struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
406 union morus1280_block_in tmp;
407
408 if (keylen == MORUS1280_BLOCK_SIZE)
409 crypto_morus1280_load(&ctx->key, key);
410 else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
411 memcpy(tmp.bytes, key, keylen);
412 memcpy(tmp.bytes + keylen, key, keylen);
413
414 crypto_morus1280_load(&ctx->key, tmp.bytes);
415 } else {
416 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
417 return -EINVAL;
418 }
419
420 return 0;
421}
422
423static int crypto_morus1280_setauthsize(struct crypto_aead *tfm,
424 unsigned int authsize)
425{
426 return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
427}
428
429static void crypto_morus1280_crypt(struct aead_request *req,
430 struct morus1280_block *tag_xor,
431 unsigned int cryptlen,
432 const struct morus1280_ops *ops)
433{
434 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
435 struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
436 struct morus1280_state state;
437
438 crypto_morus1280_init(&state, &ctx->key, req->iv);
439 crypto_morus1280_process_ad(&state, req->src, req->assoclen);
440 crypto_morus1280_process_crypt(&state, req, ops);
441 crypto_morus1280_final(&state, tag_xor, req->assoclen, cryptlen);
442}
443
444static int crypto_morus1280_encrypt(struct aead_request *req)
445{
446 static const struct morus1280_ops ops = {
447 .skcipher_walk_init = skcipher_walk_aead_encrypt,
448 .crypt_chunk = crypto_morus1280_encrypt_chunk,
449 };
450
451 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
452 struct morus1280_block tag = {};
453 union morus1280_block_in tag_out;
454 unsigned int authsize = crypto_aead_authsize(tfm);
455 unsigned int cryptlen = req->cryptlen;
456
457 crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
458 crypto_morus1280_store(tag_out.bytes, &tag);
459
460 scatterwalk_map_and_copy(tag_out.bytes, req->dst,
461 req->assoclen + cryptlen, authsize, 1);
462 return 0;
463}
464
465static int crypto_morus1280_decrypt(struct aead_request *req)
466{
467 static const struct morus1280_ops ops = {
468 .skcipher_walk_init = skcipher_walk_aead_decrypt,
469 .crypt_chunk = crypto_morus1280_decrypt_chunk,
470 };
471 static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
472
473 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
474 union morus1280_block_in tag_in;
475 struct morus1280_block tag;
476 unsigned int authsize = crypto_aead_authsize(tfm);
477 unsigned int cryptlen = req->cryptlen - authsize;
478
479 scatterwalk_map_and_copy(tag_in.bytes, req->src,
480 req->assoclen + cryptlen, authsize, 0);
481
482 crypto_morus1280_load(&tag, tag_in.bytes);
483 crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
484 crypto_morus1280_store(tag_in.bytes, &tag);
485
486 return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
487}
488
489static int crypto_morus1280_init_tfm(struct crypto_aead *tfm)
490{
491 return 0;
492}
493
494static void crypto_morus1280_exit_tfm(struct crypto_aead *tfm)
495{
496}
497
498static struct aead_alg crypto_morus1280_alg = {
499 .setkey = crypto_morus1280_setkey,
500 .setauthsize = crypto_morus1280_setauthsize,
501 .encrypt = crypto_morus1280_encrypt,
502 .decrypt = crypto_morus1280_decrypt,
503 .init = crypto_morus1280_init_tfm,
504 .exit = crypto_morus1280_exit_tfm,
505
506 .ivsize = MORUS_NONCE_SIZE,
507 .maxauthsize = MORUS_MAX_AUTH_SIZE,
508 .chunksize = MORUS1280_BLOCK_SIZE,
509
510 .base = {
511 .cra_blocksize = 1,
512 .cra_ctxsize = sizeof(struct morus1280_ctx),
513 .cra_alignmask = 0,
514
515 .cra_priority = 100,
516
517 .cra_name = "morus1280",
518 .cra_driver_name = "morus1280-generic",
519
520 .cra_module = THIS_MODULE,
521 }
522};
523
524
525static int __init crypto_morus1280_module_init(void)
526{
527 return crypto_register_aead(&crypto_morus1280_alg);
528}
529
530static void __exit crypto_morus1280_module_exit(void)
531{
532 crypto_unregister_aead(&crypto_morus1280_alg);
533}
534
535module_init(crypto_morus1280_module_init);
536module_exit(crypto_morus1280_module_exit);
537
538MODULE_LICENSE("GPL");
539MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
540MODULE_DESCRIPTION("MORUS-1280 AEAD algorithm");
541MODULE_ALIAS_CRYPTO("morus1280");
542MODULE_ALIAS_CRYPTO("morus1280-generic");
543