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TOMOYO Linux Cross Reference
Linux/arch/x86/crypto/des3_ede_glue.c

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  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 <crypto/algapi.h>
 24 #include <crypto/des.h>
 25 #include <crypto/internal/skcipher.h>
 26 #include <linux/crypto.h>
 27 #include <linux/init.h>
 28 #include <linux/module.h>
 29 #include <linux/types.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 skcipher_request *req, const u32 *expkey)
 87 {
 88         const unsigned int bsize = DES3_EDE_BLOCK_SIZE;
 89         struct skcipher_walk walk;
 90         unsigned int nbytes;
 91         int err;
 92 
 93         err = skcipher_walk_virt(&walk, req, false);
 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 = skcipher_walk_done(&walk, nbytes);
125         }
126 
127         return err;
128 }
129 
130 static int ecb_encrypt(struct skcipher_request *req)
131 {
132         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
133         struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
134 
135         return ecb_crypt(req, ctx->enc_expkey);
136 }
137 
138 static int ecb_decrypt(struct skcipher_request *req)
139 {
140         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
141         struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
142 
143         return ecb_crypt(req, ctx->dec_expkey);
144 }
145 
146 static unsigned int __cbc_encrypt(struct des3_ede_x86_ctx *ctx,
147                                   struct skcipher_walk *walk)
148 {
149         unsigned int bsize = DES3_EDE_BLOCK_SIZE;
150         unsigned int nbytes = walk->nbytes;
151         u64 *src = (u64 *)walk->src.virt.addr;
152         u64 *dst = (u64 *)walk->dst.virt.addr;
153         u64 *iv = (u64 *)walk->iv;
154 
155         do {
156                 *dst = *src ^ *iv;
157                 des3_ede_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
158                 iv = dst;
159 
160                 src += 1;
161                 dst += 1;
162                 nbytes -= bsize;
163         } while (nbytes >= bsize);
164 
165         *(u64 *)walk->iv = *iv;
166         return nbytes;
167 }
168 
169 static int cbc_encrypt(struct skcipher_request *req)
170 {
171         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
172         struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
173         struct skcipher_walk walk;
174         unsigned int nbytes;
175         int err;
176 
177         err = skcipher_walk_virt(&walk, req, false);
178 
179         while ((nbytes = walk.nbytes)) {
180                 nbytes = __cbc_encrypt(ctx, &walk);
181                 err = skcipher_walk_done(&walk, nbytes);
182         }
183 
184         return err;
185 }
186 
187 static unsigned int __cbc_decrypt(struct des3_ede_x86_ctx *ctx,
188                                   struct skcipher_walk *walk)
189 {
190         unsigned int bsize = DES3_EDE_BLOCK_SIZE;
191         unsigned int nbytes = walk->nbytes;
192         u64 *src = (u64 *)walk->src.virt.addr;
193         u64 *dst = (u64 *)walk->dst.virt.addr;
194         u64 ivs[3 - 1];
195         u64 last_iv;
196 
197         /* Start of the last block. */
198         src += nbytes / bsize - 1;
199         dst += nbytes / bsize - 1;
200 
201         last_iv = *src;
202 
203         /* Process four block batch */
204         if (nbytes >= bsize * 3) {
205                 do {
206                         nbytes -= bsize * 3 - bsize;
207                         src -= 3 - 1;
208                         dst -= 3 - 1;
209 
210                         ivs[0] = src[0];
211                         ivs[1] = src[1];
212 
213                         des3_ede_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
214 
215                         dst[1] ^= ivs[0];
216                         dst[2] ^= ivs[1];
217 
218                         nbytes -= bsize;
219                         if (nbytes < bsize)
220                                 goto done;
221 
222                         *dst ^= *(src - 1);
223                         src -= 1;
224                         dst -= 1;
225                 } while (nbytes >= bsize * 3);
226         }
227 
228         /* Handle leftovers */
229         for (;;) {
230                 des3_ede_dec_blk(ctx, (u8 *)dst, (u8 *)src);
231 
232                 nbytes -= bsize;
233                 if (nbytes < bsize)
234                         break;
235 
236                 *dst ^= *(src - 1);
237                 src -= 1;
238                 dst -= 1;
239         }
240 
241 done:
242         *dst ^= *(u64 *)walk->iv;
243         *(u64 *)walk->iv = last_iv;
244 
245         return nbytes;
246 }
247 
248 static int cbc_decrypt(struct skcipher_request *req)
249 {
250         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
251         struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
252         struct skcipher_walk walk;
253         unsigned int nbytes;
254         int err;
255 
256         err = skcipher_walk_virt(&walk, req, false);
257 
258         while ((nbytes = walk.nbytes)) {
259                 nbytes = __cbc_decrypt(ctx, &walk);
260                 err = skcipher_walk_done(&walk, nbytes);
261         }
262 
263         return err;
264 }
265 
266 static void ctr_crypt_final(struct des3_ede_x86_ctx *ctx,
267                             struct skcipher_walk *walk)
268 {
269         u8 *ctrblk = walk->iv;
270         u8 keystream[DES3_EDE_BLOCK_SIZE];
271         u8 *src = walk->src.virt.addr;
272         u8 *dst = walk->dst.virt.addr;
273         unsigned int nbytes = walk->nbytes;
274 
275         des3_ede_enc_blk(ctx, keystream, ctrblk);
276         crypto_xor_cpy(dst, keystream, src, nbytes);
277 
278         crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE);
279 }
280 
281 static unsigned int __ctr_crypt(struct des3_ede_x86_ctx *ctx,
282                                 struct skcipher_walk *walk)
283 {
284         unsigned int bsize = DES3_EDE_BLOCK_SIZE;
285         unsigned int nbytes = walk->nbytes;
286         __be64 *src = (__be64 *)walk->src.virt.addr;
287         __be64 *dst = (__be64 *)walk->dst.virt.addr;
288         u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
289         __be64 ctrblocks[3];
290 
291         /* Process four block batch */
292         if (nbytes >= bsize * 3) {
293                 do {
294                         /* create ctrblks for parallel encrypt */
295                         ctrblocks[0] = cpu_to_be64(ctrblk++);
296                         ctrblocks[1] = cpu_to_be64(ctrblk++);
297                         ctrblocks[2] = cpu_to_be64(ctrblk++);
298 
299                         des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
300                                               (u8 *)ctrblocks);
301 
302                         dst[0] = src[0] ^ ctrblocks[0];
303                         dst[1] = src[1] ^ ctrblocks[1];
304                         dst[2] = src[2] ^ ctrblocks[2];
305 
306                         src += 3;
307                         dst += 3;
308                 } while ((nbytes -= bsize * 3) >= bsize * 3);
309 
310                 if (nbytes < bsize)
311                         goto done;
312         }
313 
314         /* Handle leftovers */
315         do {
316                 ctrblocks[0] = cpu_to_be64(ctrblk++);
317 
318                 des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
319 
320                 dst[0] = src[0] ^ ctrblocks[0];
321 
322                 src += 1;
323                 dst += 1;
324         } while ((nbytes -= bsize) >= bsize);
325 
326 done:
327         *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
328         return nbytes;
329 }
330 
331 static int ctr_crypt(struct skcipher_request *req)
332 {
333         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
334         struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
335         struct skcipher_walk walk;
336         unsigned int nbytes;
337         int err;
338 
339         err = skcipher_walk_virt(&walk, req, false);
340 
341         while ((nbytes = walk.nbytes) >= DES3_EDE_BLOCK_SIZE) {
342                 nbytes = __ctr_crypt(ctx, &walk);
343                 err = skcipher_walk_done(&walk, nbytes);
344         }
345 
346         if (nbytes) {
347                 ctr_crypt_final(ctx, &walk);
348                 err = skcipher_walk_done(&walk, 0);
349         }
350 
351         return err;
352 }
353 
354 static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
355                                unsigned int keylen)
356 {
357         struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
358         u32 i, j, tmp;
359         int err;
360 
361         /* Generate encryption context using generic implementation. */
362         err = __des3_ede_setkey(ctx->enc_expkey, &tfm->crt_flags, key, keylen);
363         if (err < 0)
364                 return err;
365 
366         /* Fix encryption context for this implementation and form decryption
367          * context. */
368         j = DES3_EDE_EXPKEY_WORDS - 2;
369         for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
370                 tmp = ror32(ctx->enc_expkey[i + 1], 4);
371                 ctx->enc_expkey[i + 1] = tmp;
372 
373                 ctx->dec_expkey[j + 0] = ctx->enc_expkey[i + 0];
374                 ctx->dec_expkey[j + 1] = tmp;
375         }
376 
377         return 0;
378 }
379 
380 static int des3_ede_x86_setkey_skcipher(struct crypto_skcipher *tfm,
381                                         const u8 *key,
382                                         unsigned int keylen)
383 {
384         return des3_ede_x86_setkey(&tfm->base, key, keylen);
385 }
386 
387 static struct crypto_alg des3_ede_cipher = {
388         .cra_name               = "des3_ede",
389         .cra_driver_name        = "des3_ede-asm",
390         .cra_priority           = 200,
391         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
392         .cra_blocksize          = DES3_EDE_BLOCK_SIZE,
393         .cra_ctxsize            = sizeof(struct des3_ede_x86_ctx),
394         .cra_alignmask          = 0,
395         .cra_module             = THIS_MODULE,
396         .cra_u = {
397                 .cipher = {
398                         .cia_min_keysize        = DES3_EDE_KEY_SIZE,
399                         .cia_max_keysize        = DES3_EDE_KEY_SIZE,
400                         .cia_setkey             = des3_ede_x86_setkey,
401                         .cia_encrypt            = des3_ede_x86_encrypt,
402                         .cia_decrypt            = des3_ede_x86_decrypt,
403                 }
404         }
405 };
406 
407 static struct skcipher_alg des3_ede_skciphers[] = {
408         {
409                 .base.cra_name          = "ecb(des3_ede)",
410                 .base.cra_driver_name   = "ecb-des3_ede-asm",
411                 .base.cra_priority      = 300,
412                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
413                 .base.cra_ctxsize       = sizeof(struct des3_ede_x86_ctx),
414                 .base.cra_module        = THIS_MODULE,
415                 .min_keysize            = DES3_EDE_KEY_SIZE,
416                 .max_keysize            = DES3_EDE_KEY_SIZE,
417                 .setkey                 = des3_ede_x86_setkey_skcipher,
418                 .encrypt                = ecb_encrypt,
419                 .decrypt                = ecb_decrypt,
420         }, {
421                 .base.cra_name          = "cbc(des3_ede)",
422                 .base.cra_driver_name   = "cbc-des3_ede-asm",
423                 .base.cra_priority      = 300,
424                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
425                 .base.cra_ctxsize       = sizeof(struct des3_ede_x86_ctx),
426                 .base.cra_module        = THIS_MODULE,
427                 .min_keysize            = DES3_EDE_KEY_SIZE,
428                 .max_keysize            = DES3_EDE_KEY_SIZE,
429                 .ivsize                 = DES3_EDE_BLOCK_SIZE,
430                 .setkey                 = des3_ede_x86_setkey_skcipher,
431                 .encrypt                = cbc_encrypt,
432                 .decrypt                = cbc_decrypt,
433         }, {
434                 .base.cra_name          = "ctr(des3_ede)",
435                 .base.cra_driver_name   = "ctr-des3_ede-asm",
436                 .base.cra_priority      = 300,
437                 .base.cra_blocksize     = 1,
438                 .base.cra_ctxsize       = sizeof(struct des3_ede_x86_ctx),
439                 .base.cra_module        = THIS_MODULE,
440                 .min_keysize            = DES3_EDE_KEY_SIZE,
441                 .max_keysize            = DES3_EDE_KEY_SIZE,
442                 .ivsize                 = DES3_EDE_BLOCK_SIZE,
443                 .chunksize              = DES3_EDE_BLOCK_SIZE,
444                 .setkey                 = des3_ede_x86_setkey_skcipher,
445                 .encrypt                = ctr_crypt,
446                 .decrypt                = ctr_crypt,
447         }
448 };
449 
450 static bool is_blacklisted_cpu(void)
451 {
452         if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
453                 return false;
454 
455         if (boot_cpu_data.x86 == 0x0f) {
456                 /*
457                  * On Pentium 4, des3_ede-x86_64 is slower than generic C
458                  * implementation because use of 64bit rotates (which are really
459                  * slow on P4). Therefore blacklist P4s.
460                  */
461                 return true;
462         }
463 
464         return false;
465 }
466 
467 static int force;
468 module_param(force, int, 0);
469 MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
470 
471 static int __init des3_ede_x86_init(void)
472 {
473         int err;
474 
475         if (!force && is_blacklisted_cpu()) {
476                 pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
477                 return -ENODEV;
478         }
479 
480         err = crypto_register_alg(&des3_ede_cipher);
481         if (err)
482                 return err;
483 
484         err = crypto_register_skciphers(des3_ede_skciphers,
485                                         ARRAY_SIZE(des3_ede_skciphers));
486         if (err)
487                 crypto_unregister_alg(&des3_ede_cipher);
488 
489         return err;
490 }
491 
492 static void __exit des3_ede_x86_fini(void)
493 {
494         crypto_unregister_alg(&des3_ede_cipher);
495         crypto_unregister_skciphers(des3_ede_skciphers,
496                                     ARRAY_SIZE(des3_ede_skciphers));
497 }
498 
499 module_init(des3_ede_x86_init);
500 module_exit(des3_ede_x86_fini);
501 
502 MODULE_LICENSE("GPL");
503 MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
504 MODULE_ALIAS_CRYPTO("des3_ede");
505 MODULE_ALIAS_CRYPTO("des3_ede-asm");
506 MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
507 

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