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6574e6c6 JK |
1 | /* |
2 | * Glue Code for assembler optimized version of 3DES | |
3 | * | |
4 | * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
5 | * | |
6 | * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: | |
7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * CTR part based on code (crypto/ctr.c) by: | |
9 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <asm/processor.h> | |
24 | #include <crypto/des.h> | |
25 | #include <linux/crypto.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <crypto/algapi.h> | |
30 | ||
31 | struct des3_ede_x86_ctx { | |
32 | u32 enc_expkey[DES3_EDE_EXPKEY_WORDS]; | |
33 | u32 dec_expkey[DES3_EDE_EXPKEY_WORDS]; | |
34 | }; | |
35 | ||
36 | /* regular block cipher functions */ | |
37 | asmlinkage void des3_ede_x86_64_crypt_blk(const u32 *expkey, u8 *dst, | |
38 | const u8 *src); | |
39 | ||
40 | /* 3-way parallel cipher functions */ | |
41 | asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 *expkey, u8 *dst, | |
42 | const u8 *src); | |
43 | ||
44 | static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx *ctx, u8 *dst, | |
45 | const u8 *src) | |
46 | { | |
47 | u32 *enc_ctx = ctx->enc_expkey; | |
48 | ||
49 | des3_ede_x86_64_crypt_blk(enc_ctx, dst, src); | |
50 | } | |
51 | ||
52 | static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx *ctx, u8 *dst, | |
53 | const u8 *src) | |
54 | { | |
55 | u32 *dec_ctx = ctx->dec_expkey; | |
56 | ||
57 | des3_ede_x86_64_crypt_blk(dec_ctx, dst, src); | |
58 | } | |
59 | ||
60 | static inline void des3_ede_enc_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst, | |
61 | const u8 *src) | |
62 | { | |
63 | u32 *enc_ctx = ctx->enc_expkey; | |
64 | ||
65 | des3_ede_x86_64_crypt_blk_3way(enc_ctx, dst, src); | |
66 | } | |
67 | ||
68 | static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst, | |
69 | const u8 *src) | |
70 | { | |
71 | u32 *dec_ctx = ctx->dec_expkey; | |
72 | ||
73 | des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src); | |
74 | } | |
75 | ||
76 | static void des3_ede_x86_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
77 | { | |
78 | des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src); | |
79 | } | |
80 | ||
81 | static void des3_ede_x86_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
82 | { | |
83 | des3_ede_dec_blk(crypto_tfm_ctx(tfm), dst, src); | |
84 | } | |
85 | ||
86 | static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, | |
87 | const u32 *expkey) | |
88 | { | |
89 | unsigned int bsize = DES3_EDE_BLOCK_SIZE; | |
90 | unsigned int nbytes; | |
91 | int err; | |
92 | ||
93 | err = blkcipher_walk_virt(desc, walk); | |
94 | ||
95 | while ((nbytes = walk->nbytes)) { | |
96 | u8 *wsrc = walk->src.virt.addr; | |
97 | u8 *wdst = walk->dst.virt.addr; | |
98 | ||
99 | /* Process four block batch */ | |
100 | if (nbytes >= bsize * 3) { | |
101 | do { | |
102 | des3_ede_x86_64_crypt_blk_3way(expkey, wdst, | |
103 | wsrc); | |
104 | ||
105 | wsrc += bsize * 3; | |
106 | wdst += bsize * 3; | |
107 | nbytes -= bsize * 3; | |
108 | } while (nbytes >= bsize * 3); | |
109 | ||
110 | if (nbytes < bsize) | |
111 | goto done; | |
112 | } | |
113 | ||
114 | /* Handle leftovers */ | |
115 | do { | |
116 | des3_ede_x86_64_crypt_blk(expkey, wdst, wsrc); | |
117 | ||
118 | wsrc += bsize; | |
119 | wdst += bsize; | |
120 | nbytes -= bsize; | |
121 | } while (nbytes >= bsize); | |
122 | ||
123 | done: | |
124 | err = blkcipher_walk_done(desc, walk, nbytes); | |
125 | } | |
126 | ||
127 | return err; | |
128 | } | |
129 | ||
130 | static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
131 | struct scatterlist *src, unsigned int nbytes) | |
132 | { | |
133 | struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
134 | struct blkcipher_walk walk; | |
135 | ||
136 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
137 | return ecb_crypt(desc, &walk, ctx->enc_expkey); | |
138 | } | |
139 | ||
140 | static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
141 | struct scatterlist *src, unsigned int nbytes) | |
142 | { | |
143 | struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
144 | struct blkcipher_walk walk; | |
145 | ||
146 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
147 | return ecb_crypt(desc, &walk, ctx->dec_expkey); | |
148 | } | |
149 | ||
150 | static unsigned int __cbc_encrypt(struct blkcipher_desc *desc, | |
151 | struct blkcipher_walk *walk) | |
152 | { | |
153 | struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
154 | unsigned int bsize = DES3_EDE_BLOCK_SIZE; | |
155 | unsigned int nbytes = walk->nbytes; | |
156 | u64 *src = (u64 *)walk->src.virt.addr; | |
157 | u64 *dst = (u64 *)walk->dst.virt.addr; | |
158 | u64 *iv = (u64 *)walk->iv; | |
159 | ||
160 | do { | |
161 | *dst = *src ^ *iv; | |
162 | des3_ede_enc_blk(ctx, (u8 *)dst, (u8 *)dst); | |
163 | iv = dst; | |
164 | ||
165 | src += 1; | |
166 | dst += 1; | |
167 | nbytes -= bsize; | |
168 | } while (nbytes >= bsize); | |
169 | ||
170 | *(u64 *)walk->iv = *iv; | |
171 | return nbytes; | |
172 | } | |
173 | ||
174 | static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
175 | struct scatterlist *src, unsigned int nbytes) | |
176 | { | |
177 | struct blkcipher_walk walk; | |
178 | int err; | |
179 | ||
180 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
181 | err = blkcipher_walk_virt(desc, &walk); | |
182 | ||
183 | while ((nbytes = walk.nbytes)) { | |
184 | nbytes = __cbc_encrypt(desc, &walk); | |
185 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
186 | } | |
187 | ||
188 | return err; | |
189 | } | |
190 | ||
191 | static unsigned int __cbc_decrypt(struct blkcipher_desc *desc, | |
192 | struct blkcipher_walk *walk) | |
193 | { | |
194 | struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
195 | unsigned int bsize = DES3_EDE_BLOCK_SIZE; | |
196 | unsigned int nbytes = walk->nbytes; | |
197 | u64 *src = (u64 *)walk->src.virt.addr; | |
198 | u64 *dst = (u64 *)walk->dst.virt.addr; | |
199 | u64 ivs[3 - 1]; | |
200 | u64 last_iv; | |
201 | ||
202 | /* Start of the last block. */ | |
203 | src += nbytes / bsize - 1; | |
204 | dst += nbytes / bsize - 1; | |
205 | ||
206 | last_iv = *src; | |
207 | ||
208 | /* Process four block batch */ | |
209 | if (nbytes >= bsize * 3) { | |
210 | do { | |
211 | nbytes -= bsize * 3 - bsize; | |
212 | src -= 3 - 1; | |
213 | dst -= 3 - 1; | |
214 | ||
215 | ivs[0] = src[0]; | |
216 | ivs[1] = src[1]; | |
217 | ||
218 | des3_ede_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src); | |
219 | ||
220 | dst[1] ^= ivs[0]; | |
221 | dst[2] ^= ivs[1]; | |
222 | ||
223 | nbytes -= bsize; | |
224 | if (nbytes < bsize) | |
225 | goto done; | |
226 | ||
227 | *dst ^= *(src - 1); | |
228 | src -= 1; | |
229 | dst -= 1; | |
230 | } while (nbytes >= bsize * 3); | |
231 | } | |
232 | ||
233 | /* Handle leftovers */ | |
234 | for (;;) { | |
235 | des3_ede_dec_blk(ctx, (u8 *)dst, (u8 *)src); | |
236 | ||
237 | nbytes -= bsize; | |
238 | if (nbytes < bsize) | |
239 | break; | |
240 | ||
241 | *dst ^= *(src - 1); | |
242 | src -= 1; | |
243 | dst -= 1; | |
244 | } | |
245 | ||
246 | done: | |
247 | *dst ^= *(u64 *)walk->iv; | |
248 | *(u64 *)walk->iv = last_iv; | |
249 | ||
250 | return nbytes; | |
251 | } | |
252 | ||
253 | static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
254 | struct scatterlist *src, unsigned int nbytes) | |
255 | { | |
256 | struct blkcipher_walk walk; | |
257 | int err; | |
258 | ||
259 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
260 | err = blkcipher_walk_virt(desc, &walk); | |
261 | ||
262 | while ((nbytes = walk.nbytes)) { | |
263 | nbytes = __cbc_decrypt(desc, &walk); | |
264 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
265 | } | |
266 | ||
267 | return err; | |
268 | } | |
269 | ||
270 | static void ctr_crypt_final(struct des3_ede_x86_ctx *ctx, | |
271 | struct blkcipher_walk *walk) | |
272 | { | |
273 | u8 *ctrblk = walk->iv; | |
274 | u8 keystream[DES3_EDE_BLOCK_SIZE]; | |
275 | u8 *src = walk->src.virt.addr; | |
276 | u8 *dst = walk->dst.virt.addr; | |
277 | unsigned int nbytes = walk->nbytes; | |
278 | ||
279 | des3_ede_enc_blk(ctx, keystream, ctrblk); | |
280 | crypto_xor(keystream, src, nbytes); | |
281 | memcpy(dst, keystream, nbytes); | |
282 | ||
283 | crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE); | |
284 | } | |
285 | ||
286 | static unsigned int __ctr_crypt(struct blkcipher_desc *desc, | |
287 | struct blkcipher_walk *walk) | |
288 | { | |
289 | struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
290 | unsigned int bsize = DES3_EDE_BLOCK_SIZE; | |
291 | unsigned int nbytes = walk->nbytes; | |
5e50d43d JK |
292 | __be64 *src = (__be64 *)walk->src.virt.addr; |
293 | __be64 *dst = (__be64 *)walk->dst.virt.addr; | |
6574e6c6 JK |
294 | u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv); |
295 | __be64 ctrblocks[3]; | |
296 | ||
297 | /* Process four block batch */ | |
298 | if (nbytes >= bsize * 3) { | |
299 | do { | |
300 | /* create ctrblks for parallel encrypt */ | |
301 | ctrblocks[0] = cpu_to_be64(ctrblk++); | |
302 | ctrblocks[1] = cpu_to_be64(ctrblk++); | |
303 | ctrblocks[2] = cpu_to_be64(ctrblk++); | |
304 | ||
305 | des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks, | |
306 | (u8 *)ctrblocks); | |
307 | ||
308 | dst[0] = src[0] ^ ctrblocks[0]; | |
309 | dst[1] = src[1] ^ ctrblocks[1]; | |
310 | dst[2] = src[2] ^ ctrblocks[2]; | |
311 | ||
312 | src += 3; | |
313 | dst += 3; | |
314 | } while ((nbytes -= bsize * 3) >= bsize * 3); | |
315 | ||
316 | if (nbytes < bsize) | |
317 | goto done; | |
318 | } | |
319 | ||
320 | /* Handle leftovers */ | |
321 | do { | |
322 | ctrblocks[0] = cpu_to_be64(ctrblk++); | |
323 | ||
324 | des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks); | |
325 | ||
326 | dst[0] = src[0] ^ ctrblocks[0]; | |
327 | ||
328 | src += 1; | |
329 | dst += 1; | |
330 | } while ((nbytes -= bsize) >= bsize); | |
331 | ||
332 | done: | |
333 | *(__be64 *)walk->iv = cpu_to_be64(ctrblk); | |
334 | return nbytes; | |
335 | } | |
336 | ||
337 | static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
338 | struct scatterlist *src, unsigned int nbytes) | |
339 | { | |
340 | struct blkcipher_walk walk; | |
341 | int err; | |
342 | ||
343 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
344 | err = blkcipher_walk_virt_block(desc, &walk, DES3_EDE_BLOCK_SIZE); | |
345 | ||
346 | while ((nbytes = walk.nbytes) >= DES3_EDE_BLOCK_SIZE) { | |
347 | nbytes = __ctr_crypt(desc, &walk); | |
348 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
349 | } | |
350 | ||
351 | if (walk.nbytes) { | |
352 | ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk); | |
353 | err = blkcipher_walk_done(desc, &walk, 0); | |
354 | } | |
355 | ||
356 | return err; | |
357 | } | |
358 | ||
359 | static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key, | |
360 | unsigned int keylen) | |
361 | { | |
362 | struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm); | |
363 | u32 i, j, tmp; | |
364 | int err; | |
365 | ||
366 | /* Generate encryption context using generic implementation. */ | |
367 | err = __des3_ede_setkey(ctx->enc_expkey, &tfm->crt_flags, key, keylen); | |
368 | if (err < 0) | |
369 | return err; | |
370 | ||
371 | /* Fix encryption context for this implementation and form decryption | |
372 | * context. */ | |
373 | j = DES3_EDE_EXPKEY_WORDS - 2; | |
374 | for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) { | |
375 | tmp = ror32(ctx->enc_expkey[i + 1], 4); | |
376 | ctx->enc_expkey[i + 1] = tmp; | |
377 | ||
378 | ctx->dec_expkey[j + 0] = ctx->enc_expkey[i + 0]; | |
379 | ctx->dec_expkey[j + 1] = tmp; | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static struct crypto_alg des3_ede_algs[4] = { { | |
386 | .cra_name = "des3_ede", | |
387 | .cra_driver_name = "des3_ede-asm", | |
388 | .cra_priority = 200, | |
389 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, | |
390 | .cra_blocksize = DES3_EDE_BLOCK_SIZE, | |
391 | .cra_ctxsize = sizeof(struct des3_ede_x86_ctx), | |
392 | .cra_alignmask = 0, | |
393 | .cra_module = THIS_MODULE, | |
394 | .cra_u = { | |
395 | .cipher = { | |
396 | .cia_min_keysize = DES3_EDE_KEY_SIZE, | |
397 | .cia_max_keysize = DES3_EDE_KEY_SIZE, | |
398 | .cia_setkey = des3_ede_x86_setkey, | |
399 | .cia_encrypt = des3_ede_x86_encrypt, | |
400 | .cia_decrypt = des3_ede_x86_decrypt, | |
401 | } | |
402 | } | |
403 | }, { | |
404 | .cra_name = "ecb(des3_ede)", | |
405 | .cra_driver_name = "ecb-des3_ede-asm", | |
406 | .cra_priority = 300, | |
407 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
408 | .cra_blocksize = DES3_EDE_BLOCK_SIZE, | |
409 | .cra_ctxsize = sizeof(struct des3_ede_x86_ctx), | |
410 | .cra_alignmask = 0, | |
411 | .cra_type = &crypto_blkcipher_type, | |
412 | .cra_module = THIS_MODULE, | |
413 | .cra_u = { | |
414 | .blkcipher = { | |
415 | .min_keysize = DES3_EDE_KEY_SIZE, | |
416 | .max_keysize = DES3_EDE_KEY_SIZE, | |
417 | .setkey = des3_ede_x86_setkey, | |
418 | .encrypt = ecb_encrypt, | |
419 | .decrypt = ecb_decrypt, | |
420 | }, | |
421 | }, | |
422 | }, { | |
423 | .cra_name = "cbc(des3_ede)", | |
424 | .cra_driver_name = "cbc-des3_ede-asm", | |
425 | .cra_priority = 300, | |
426 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
427 | .cra_blocksize = DES3_EDE_BLOCK_SIZE, | |
428 | .cra_ctxsize = sizeof(struct des3_ede_x86_ctx), | |
429 | .cra_alignmask = 0, | |
430 | .cra_type = &crypto_blkcipher_type, | |
431 | .cra_module = THIS_MODULE, | |
432 | .cra_u = { | |
433 | .blkcipher = { | |
434 | .min_keysize = DES3_EDE_KEY_SIZE, | |
435 | .max_keysize = DES3_EDE_KEY_SIZE, | |
436 | .ivsize = DES3_EDE_BLOCK_SIZE, | |
437 | .setkey = des3_ede_x86_setkey, | |
438 | .encrypt = cbc_encrypt, | |
439 | .decrypt = cbc_decrypt, | |
440 | }, | |
441 | }, | |
442 | }, { | |
443 | .cra_name = "ctr(des3_ede)", | |
444 | .cra_driver_name = "ctr-des3_ede-asm", | |
445 | .cra_priority = 300, | |
446 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
447 | .cra_blocksize = 1, | |
448 | .cra_ctxsize = sizeof(struct des3_ede_x86_ctx), | |
449 | .cra_alignmask = 0, | |
450 | .cra_type = &crypto_blkcipher_type, | |
451 | .cra_module = THIS_MODULE, | |
452 | .cra_u = { | |
453 | .blkcipher = { | |
454 | .min_keysize = DES3_EDE_KEY_SIZE, | |
455 | .max_keysize = DES3_EDE_KEY_SIZE, | |
456 | .ivsize = DES3_EDE_BLOCK_SIZE, | |
457 | .setkey = des3_ede_x86_setkey, | |
458 | .encrypt = ctr_crypt, | |
459 | .decrypt = ctr_crypt, | |
460 | }, | |
461 | }, | |
462 | } }; | |
463 | ||
464 | static bool is_blacklisted_cpu(void) | |
465 | { | |
466 | if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) | |
467 | return false; | |
468 | ||
469 | if (boot_cpu_data.x86 == 0x0f) { | |
470 | /* | |
471 | * On Pentium 4, des3_ede-x86_64 is slower than generic C | |
472 | * implementation because use of 64bit rotates (which are really | |
473 | * slow on P4). Therefore blacklist P4s. | |
474 | */ | |
475 | return true; | |
476 | } | |
477 | ||
478 | return false; | |
479 | } | |
480 | ||
481 | static int force; | |
482 | module_param(force, int, 0); | |
483 | MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist"); | |
484 | ||
485 | static int __init des3_ede_x86_init(void) | |
486 | { | |
487 | if (!force && is_blacklisted_cpu()) { | |
488 | pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n"); | |
489 | return -ENODEV; | |
490 | } | |
491 | ||
492 | return crypto_register_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs)); | |
493 | } | |
494 | ||
495 | static void __exit des3_ede_x86_fini(void) | |
496 | { | |
497 | crypto_unregister_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs)); | |
498 | } | |
499 | ||
500 | module_init(des3_ede_x86_init); | |
501 | module_exit(des3_ede_x86_fini); | |
502 | ||
503 | MODULE_LICENSE("GPL"); | |
504 | MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized"); | |
5d26a105 KC |
505 | MODULE_ALIAS_CRYPTO("des3_ede"); |
506 | MODULE_ALIAS_CRYPTO("des3_ede-asm"); | |
6574e6c6 | 507 | MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>"); |