1 /*
2 * The MORUS-1280 Authenticated-Encryption Algorithm
3 *
4 * Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com>
5 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 */
12
13 #include <asm/unaligned.h>
14 #include <crypto/algapi.h>
15 #include <crypto/internal/aead.h>
16 #include <crypto/internal/skcipher.h>
17 #include <crypto/morus_common.h>
18 #include <crypto/scatterwalk.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/scatterlist.h>
24
25 #define MORUS1280_WORD_SIZE 8
26 #define MORUS1280_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS1280_WORD_SIZE)
27 #define MORUS1280_BLOCK_ALIGN (__alignof__(__le64))
28 #define MORUS1280_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS1280_BLOCK_ALIGN)
29
30 struct morus1280_block {
31 u64 words[MORUS_BLOCK_WORDS];
32 };
33
34 union morus1280_block_in {
35 __le64 words[MORUS_BLOCK_WORDS];
36 u8 bytes[MORUS1280_BLOCK_SIZE];
37 };
38
39 struct morus1280_state {
40 struct morus1280_block s[MORUS_STATE_BLOCKS];
41 };
42
43 struct morus1280_ctx {
44 struct morus1280_block key;
45 };
46
47 struct morus1280_ops {
48 int (*skcipher_walk_init)(struct skcipher_walk *walk,
49 struct aead_request *req, bool atomic);
50
51 void (*crypt_chunk)(struct morus1280_state *state,
52 u8 *dst, const u8 *src, unsigned int size);
53 };
54
55 static const struct morus1280_block crypto_morus1280_const[1] = {
56 { .words = {
57 U64_C(0x0d08050302010100),
58 U64_C(0x6279e99059372215),
59 U64_C(0xf12fc26d55183ddb),
60 U64_C(0xdd28b57342311120),
61 } },
62 };
63
crypto_morus1280_round(struct morus1280_block * b0,struct morus1280_block * b1,struct morus1280_block * b2,struct morus1280_block * b3,struct morus1280_block * b4,const struct morus1280_block * m,unsigned int b,unsigned int w)64 static void crypto_morus1280_round(struct morus1280_block *b0,
65 struct morus1280_block *b1,
66 struct morus1280_block *b2,
67 struct morus1280_block *b3,
68 struct morus1280_block *b4,
69 const struct morus1280_block *m,
70 unsigned int b, unsigned int w)
71 {
72 unsigned int i;
73 struct morus1280_block tmp;
74
75 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
76 b0->words[i] ^= b1->words[i] & b2->words[i];
77 b0->words[i] ^= b3->words[i];
78 b0->words[i] ^= m->words[i];
79 b0->words[i] = rol64(b0->words[i], b);
80 }
81
82 tmp = *b3;
83 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
84 b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i];
85 }
86
crypto_morus1280_update(struct morus1280_state * state,const struct morus1280_block * m)87 static void crypto_morus1280_update(struct morus1280_state *state,
88 const struct morus1280_block *m)
89 {
90 static const struct morus1280_block z = {};
91
92 struct morus1280_block *s = state->s;
93
94 crypto_morus1280_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 13, 1);
95 crypto_morus1280_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 46, 2);
96 crypto_morus1280_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 38, 3);
97 crypto_morus1280_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 7, 2);
98 crypto_morus1280_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 4, 1);
99 }
100
crypto_morus1280_load_a(struct morus1280_block * dst,const u8 * src)101 static void crypto_morus1280_load_a(struct morus1280_block *dst, const u8 *src)
102 {
103 unsigned int i;
104 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
105 dst->words[i] = le64_to_cpu(*(const __le64 *)src);
106 src += MORUS1280_WORD_SIZE;
107 }
108 }
109
crypto_morus1280_load_u(struct morus1280_block * dst,const u8 * src)110 static void crypto_morus1280_load_u(struct morus1280_block *dst, const u8 *src)
111 {
112 unsigned int i;
113 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
114 dst->words[i] = get_unaligned_le64(src);
115 src += MORUS1280_WORD_SIZE;
116 }
117 }
118
crypto_morus1280_load(struct morus1280_block * dst,const u8 * src)119 static void crypto_morus1280_load(struct morus1280_block *dst, const u8 *src)
120 {
121 if (MORUS1280_ALIGNED(src))
122 crypto_morus1280_load_a(dst, src);
123 else
124 crypto_morus1280_load_u(dst, src);
125 }
126
crypto_morus1280_store_a(u8 * dst,const struct morus1280_block * src)127 static void crypto_morus1280_store_a(u8 *dst, const struct morus1280_block *src)
128 {
129 unsigned int i;
130 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
131 *(__le64 *)dst = cpu_to_le64(src->words[i]);
132 dst += MORUS1280_WORD_SIZE;
133 }
134 }
135
crypto_morus1280_store_u(u8 * dst,const struct morus1280_block * src)136 static void crypto_morus1280_store_u(u8 *dst, const struct morus1280_block *src)
137 {
138 unsigned int i;
139 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
140 put_unaligned_le64(src->words[i], dst);
141 dst += MORUS1280_WORD_SIZE;
142 }
143 }
144
crypto_morus1280_store(u8 * dst,const struct morus1280_block * src)145 static void crypto_morus1280_store(u8 *dst, const struct morus1280_block *src)
146 {
147 if (MORUS1280_ALIGNED(dst))
148 crypto_morus1280_store_a(dst, src);
149 else
150 crypto_morus1280_store_u(dst, src);
151 }
152
crypto_morus1280_ad(struct morus1280_state * state,const u8 * src,unsigned int size)153 static void crypto_morus1280_ad(struct morus1280_state *state, const u8 *src,
154 unsigned int size)
155 {
156 struct morus1280_block m;
157
158 if (MORUS1280_ALIGNED(src)) {
159 while (size >= MORUS1280_BLOCK_SIZE) {
160 crypto_morus1280_load_a(&m, src);
161 crypto_morus1280_update(state, &m);
162
163 size -= MORUS1280_BLOCK_SIZE;
164 src += MORUS1280_BLOCK_SIZE;
165 }
166 } else {
167 while (size >= MORUS1280_BLOCK_SIZE) {
168 crypto_morus1280_load_u(&m, src);
169 crypto_morus1280_update(state, &m);
170
171 size -= MORUS1280_BLOCK_SIZE;
172 src += MORUS1280_BLOCK_SIZE;
173 }
174 }
175 }
176
crypto_morus1280_core(const struct morus1280_state * state,struct morus1280_block * blk)177 static void crypto_morus1280_core(const struct morus1280_state *state,
178 struct morus1280_block *blk)
179 {
180 unsigned int i;
181
182 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
183 blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i];
184
185 for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
186 blk->words[i] ^= state->s[0].words[i];
187 blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i];
188 }
189 }
190
crypto_morus1280_encrypt_chunk(struct morus1280_state * state,u8 * dst,const u8 * src,unsigned int size)191 static void crypto_morus1280_encrypt_chunk(struct morus1280_state *state,
192 u8 *dst, const u8 *src,
193 unsigned int size)
194 {
195 struct morus1280_block c, m;
196
197 if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
198 while (size >= MORUS1280_BLOCK_SIZE) {
199 crypto_morus1280_load_a(&m, src);
200 c = m;
201 crypto_morus1280_core(state, &c);
202 crypto_morus1280_store_a(dst, &c);
203 crypto_morus1280_update(state, &m);
204
205 src += MORUS1280_BLOCK_SIZE;
206 dst += MORUS1280_BLOCK_SIZE;
207 size -= MORUS1280_BLOCK_SIZE;
208 }
209 } else {
210 while (size >= MORUS1280_BLOCK_SIZE) {
211 crypto_morus1280_load_u(&m, src);
212 c = m;
213 crypto_morus1280_core(state, &c);
214 crypto_morus1280_store_u(dst, &c);
215 crypto_morus1280_update(state, &m);
216
217 src += MORUS1280_BLOCK_SIZE;
218 dst += MORUS1280_BLOCK_SIZE;
219 size -= MORUS1280_BLOCK_SIZE;
220 }
221 }
222
223 if (size > 0) {
224 union morus1280_block_in tail;
225
226 memcpy(tail.bytes, src, size);
227 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
228
229 crypto_morus1280_load_a(&m, tail.bytes);
230 c = m;
231 crypto_morus1280_core(state, &c);
232 crypto_morus1280_store_a(tail.bytes, &c);
233 crypto_morus1280_update(state, &m);
234
235 memcpy(dst, tail.bytes, size);
236 }
237 }
238
crypto_morus1280_decrypt_chunk(struct morus1280_state * state,u8 * dst,const u8 * src,unsigned int size)239 static void crypto_morus1280_decrypt_chunk(struct morus1280_state *state,
240 u8 *dst, const u8 *src,
241 unsigned int size)
242 {
243 struct morus1280_block m;
244
245 if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
246 while (size >= MORUS1280_BLOCK_SIZE) {
247 crypto_morus1280_load_a(&m, src);
248 crypto_morus1280_core(state, &m);
249 crypto_morus1280_store_a(dst, &m);
250 crypto_morus1280_update(state, &m);
251
252 src += MORUS1280_BLOCK_SIZE;
253 dst += MORUS1280_BLOCK_SIZE;
254 size -= MORUS1280_BLOCK_SIZE;
255 }
256 } else {
257 while (size >= MORUS1280_BLOCK_SIZE) {
258 crypto_morus1280_load_u(&m, src);
259 crypto_morus1280_core(state, &m);
260 crypto_morus1280_store_u(dst, &m);
261 crypto_morus1280_update(state, &m);
262
263 src += MORUS1280_BLOCK_SIZE;
264 dst += MORUS1280_BLOCK_SIZE;
265 size -= MORUS1280_BLOCK_SIZE;
266 }
267 }
268
269 if (size > 0) {
270 union morus1280_block_in tail;
271
272 memcpy(tail.bytes, src, size);
273 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
274
275 crypto_morus1280_load_a(&m, tail.bytes);
276 crypto_morus1280_core(state, &m);
277 crypto_morus1280_store_a(tail.bytes, &m);
278 memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
279 crypto_morus1280_load_a(&m, tail.bytes);
280 crypto_morus1280_update(state, &m);
281
282 memcpy(dst, tail.bytes, size);
283 }
284 }
285
crypto_morus1280_init(struct morus1280_state * state,const struct morus1280_block * key,const u8 * iv)286 static void crypto_morus1280_init(struct morus1280_state *state,
287 const struct morus1280_block *key,
288 const u8 *iv)
289 {
290 static const struct morus1280_block z = {};
291
292 union morus1280_block_in tmp;
293 unsigned int i;
294
295 memcpy(tmp.bytes, iv, MORUS_NONCE_SIZE);
296 memset(tmp.bytes + MORUS_NONCE_SIZE, 0,
297 MORUS1280_BLOCK_SIZE - MORUS_NONCE_SIZE);
298
299 crypto_morus1280_load(&state->s[0], tmp.bytes);
300 state->s[1] = *key;
301 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
302 state->s[2].words[i] = U64_C(0xFFFFFFFFFFFFFFFF);
303 state->s[3] = z;
304 state->s[4] = crypto_morus1280_const[0];
305
306 for (i = 0; i < 16; i++)
307 crypto_morus1280_update(state, &z);
308
309 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
310 state->s[1].words[i] ^= key->words[i];
311 }
312
crypto_morus1280_process_ad(struct morus1280_state * state,struct scatterlist * sg_src,unsigned int assoclen)313 static void crypto_morus1280_process_ad(struct morus1280_state *state,
314 struct scatterlist *sg_src,
315 unsigned int assoclen)
316 {
317 struct scatter_walk walk;
318 struct morus1280_block m;
319 union morus1280_block_in buf;
320 unsigned int pos = 0;
321
322 scatterwalk_start(&walk, sg_src);
323 while (assoclen != 0) {
324 unsigned int size = scatterwalk_clamp(&walk, assoclen);
325 unsigned int left = size;
326 void *mapped = scatterwalk_map(&walk);
327 const u8 *src = (const u8 *)mapped;
328
329 if (pos + size >= MORUS1280_BLOCK_SIZE) {
330 if (pos > 0) {
331 unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
332 memcpy(buf.bytes + pos, src, fill);
333
334 crypto_morus1280_load_a(&m, buf.bytes);
335 crypto_morus1280_update(state, &m);
336
337 pos = 0;
338 left -= fill;
339 src += fill;
340 }
341
342 crypto_morus1280_ad(state, src, left);
343 src += left & ~(MORUS1280_BLOCK_SIZE - 1);
344 left &= MORUS1280_BLOCK_SIZE - 1;
345 }
346
347 memcpy(buf.bytes + pos, src, left);
348
349 pos += left;
350 assoclen -= size;
351 scatterwalk_unmap(mapped);
352 scatterwalk_advance(&walk, size);
353 scatterwalk_done(&walk, 0, assoclen);
354 }
355
356 if (pos > 0) {
357 memset(buf.bytes + pos, 0, MORUS1280_BLOCK_SIZE - pos);
358
359 crypto_morus1280_load_a(&m, buf.bytes);
360 crypto_morus1280_update(state, &m);
361 }
362 }
363
crypto_morus1280_process_crypt(struct morus1280_state * state,struct aead_request * req,const struct morus1280_ops * ops)364 static void crypto_morus1280_process_crypt(struct morus1280_state *state,
365 struct aead_request *req,
366 const struct morus1280_ops *ops)
367 {
368 struct skcipher_walk walk;
369 u8 *dst;
370 const u8 *src;
371
372 ops->skcipher_walk_init(&walk, req, false);
373
374 while (walk.nbytes) {
375 src = walk.src.virt.addr;
376 dst = walk.dst.virt.addr;
377
378 ops->crypt_chunk(state, dst, src, walk.nbytes);
379
380 skcipher_walk_done(&walk, 0);
381 }
382 }
383
crypto_morus1280_final(struct morus1280_state * state,struct morus1280_block * tag_xor,u64 assoclen,u64 cryptlen)384 static void crypto_morus1280_final(struct morus1280_state *state,
385 struct morus1280_block *tag_xor,
386 u64 assoclen, u64 cryptlen)
387 {
388 u64 assocbits = assoclen * 8;
389 u64 cryptbits = cryptlen * 8;
390
391 struct morus1280_block tmp;
392 unsigned int i;
393
394 tmp.words[0] = cpu_to_le64(assocbits);
395 tmp.words[1] = cpu_to_le64(cryptbits);
396 tmp.words[2] = 0;
397 tmp.words[3] = 0;
398
399 for (i = 0; i < MORUS_BLOCK_WORDS; i++)
400 state->s[4].words[i] ^= state->s[0].words[i];
401
402 for (i = 0; i < 10; i++)
403 crypto_morus1280_update(state, &tmp);
404
405 crypto_morus1280_core(state, tag_xor);
406 }
407
crypto_morus1280_setkey(struct crypto_aead * aead,const u8 * key,unsigned int keylen)408 static int crypto_morus1280_setkey(struct crypto_aead *aead, const u8 *key,
409 unsigned int keylen)
410 {
411 struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
412 union morus1280_block_in tmp;
413
414 if (keylen == MORUS1280_BLOCK_SIZE)
415 crypto_morus1280_load(&ctx->key, key);
416 else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
417 memcpy(tmp.bytes, key, keylen);
418 memcpy(tmp.bytes + keylen, key, keylen);
419
420 crypto_morus1280_load(&ctx->key, tmp.bytes);
421 } else {
422 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
423 return -EINVAL;
424 }
425
426 return 0;
427 }
428
crypto_morus1280_setauthsize(struct crypto_aead * tfm,unsigned int authsize)429 static int crypto_morus1280_setauthsize(struct crypto_aead *tfm,
430 unsigned int authsize)
431 {
432 return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
433 }
434
crypto_morus1280_crypt(struct aead_request * req,struct morus1280_block * tag_xor,unsigned int cryptlen,const struct morus1280_ops * ops)435 static void crypto_morus1280_crypt(struct aead_request *req,
436 struct morus1280_block *tag_xor,
437 unsigned int cryptlen,
438 const struct morus1280_ops *ops)
439 {
440 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
441 struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
442 struct morus1280_state state;
443
444 crypto_morus1280_init(&state, &ctx->key, req->iv);
445 crypto_morus1280_process_ad(&state, req->src, req->assoclen);
446 crypto_morus1280_process_crypt(&state, req, ops);
447 crypto_morus1280_final(&state, tag_xor, req->assoclen, cryptlen);
448 }
449
crypto_morus1280_encrypt(struct aead_request * req)450 static int crypto_morus1280_encrypt(struct aead_request *req)
451 {
452 static const struct morus1280_ops ops = {
453 .skcipher_walk_init = skcipher_walk_aead_encrypt,
454 .crypt_chunk = crypto_morus1280_encrypt_chunk,
455 };
456
457 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
458 struct morus1280_block tag = {};
459 union morus1280_block_in tag_out;
460 unsigned int authsize = crypto_aead_authsize(tfm);
461 unsigned int cryptlen = req->cryptlen;
462
463 crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
464 crypto_morus1280_store(tag_out.bytes, &tag);
465
466 scatterwalk_map_and_copy(tag_out.bytes, req->dst,
467 req->assoclen + cryptlen, authsize, 1);
468 return 0;
469 }
470
crypto_morus1280_decrypt(struct aead_request * req)471 static int crypto_morus1280_decrypt(struct aead_request *req)
472 {
473 static const struct morus1280_ops ops = {
474 .skcipher_walk_init = skcipher_walk_aead_decrypt,
475 .crypt_chunk = crypto_morus1280_decrypt_chunk,
476 };
477 static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
478
479 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
480 union morus1280_block_in tag_in;
481 struct morus1280_block tag;
482 unsigned int authsize = crypto_aead_authsize(tfm);
483 unsigned int cryptlen = req->cryptlen - authsize;
484
485 scatterwalk_map_and_copy(tag_in.bytes, req->src,
486 req->assoclen + cryptlen, authsize, 0);
487
488 crypto_morus1280_load(&tag, tag_in.bytes);
489 crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
490 crypto_morus1280_store(tag_in.bytes, &tag);
491
492 return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
493 }
494
crypto_morus1280_init_tfm(struct crypto_aead * tfm)495 static int crypto_morus1280_init_tfm(struct crypto_aead *tfm)
496 {
497 return 0;
498 }
499
crypto_morus1280_exit_tfm(struct crypto_aead * tfm)500 static void crypto_morus1280_exit_tfm(struct crypto_aead *tfm)
501 {
502 }
503
504 static struct aead_alg crypto_morus1280_alg = {
505 .setkey = crypto_morus1280_setkey,
506 .setauthsize = crypto_morus1280_setauthsize,
507 .encrypt = crypto_morus1280_encrypt,
508 .decrypt = crypto_morus1280_decrypt,
509 .init = crypto_morus1280_init_tfm,
510 .exit = crypto_morus1280_exit_tfm,
511
512 .ivsize = MORUS_NONCE_SIZE,
513 .maxauthsize = MORUS_MAX_AUTH_SIZE,
514 .chunksize = MORUS1280_BLOCK_SIZE,
515
516 .base = {
517 .cra_blocksize = 1,
518 .cra_ctxsize = sizeof(struct morus1280_ctx),
519 .cra_alignmask = 0,
520
521 .cra_priority = 100,
522
523 .cra_name = "morus1280",
524 .cra_driver_name = "morus1280-generic",
525
526 .cra_module = THIS_MODULE,
527 }
528 };
529
530
crypto_morus1280_module_init(void)531 static int __init crypto_morus1280_module_init(void)
532 {
533 return crypto_register_aead(&crypto_morus1280_alg);
534 }
535
crypto_morus1280_module_exit(void)536 static void __exit crypto_morus1280_module_exit(void)
537 {
538 crypto_unregister_aead(&crypto_morus1280_alg);
539 }
540
541 module_init(crypto_morus1280_module_init);
542 module_exit(crypto_morus1280_module_exit);
543
544 MODULE_LICENSE("GPL");
545 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
546 MODULE_DESCRIPTION("MORUS-1280 AEAD algorithm");
547 MODULE_ALIAS_CRYPTO("morus1280");
548 MODULE_ALIAS_CRYPTO("morus1280-generic");
549
