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Linux 4.13.16
[linux/fpc-iii.git] / arch / x86 / crypto / des3_ede_glue.c
blobd6fc59aaaadfbc0461a9aaab1557eb27f7841402
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;
292 __be64 *src = (__be64 *)walk->src.virt.addr;
293 __be64 *dst = (__be64 *)walk->dst.virt.addr;
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");
505 MODULE_ALIAS_CRYPTO("des3_ede");
506 MODULE_ALIAS_CRYPTO("des3_ede-asm");
507 MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
Linux with added FPC-III support