~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_cpy(dst, keystream, src, nbytes);
281 
282         crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE);
283 }
284 
285 static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
286                                 struct blkcipher_walk *walk)
287 {
288         struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
289         unsigned int bsize = DES3_EDE_BLOCK_SIZE;
290         unsigned int nbytes = walk->nbytes;
291         __be64 *src = (__be64 *)walk->src.virt.addr;
292         __be64 *dst = (__be64 *)walk->dst.virt.addr;
293         u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
294         __be64 ctrblocks[3];
295 
296         /* Process four block batch */
297         if (nbytes >= bsize * 3) {
298                 do {
299                         /* create ctrblks for parallel encrypt */
300                         ctrblocks[0] = cpu_to_be64(ctrblk++);
301                         ctrblocks[1] = cpu_to_be64(ctrblk++);
302                         ctrblocks[2] = cpu_to_be64(ctrblk++);
303 
304                         des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
305                                               (u8 *)ctrblocks);
306 
307                         dst[0] = src[0] ^ ctrblocks[0];
308                         dst[1] = src[1] ^ ctrblocks[1];
309                         dst[2] = src[2] ^ ctrblocks[2];
310 
311                         src += 3;
312                         dst += 3;
313                 } while ((nbytes -= bsize * 3) >= bsize * 3);
314 
315                 if (nbytes < bsize)
316                         goto done;
317         }
318 
319         /* Handle leftovers */
320         do {
321                 ctrblocks[0] = cpu_to_be64(ctrblk++);
322 
323                 des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
324 
325                 dst[0] = src[0] ^ ctrblocks[0];
326 
327                 src += 1;
328                 dst += 1;
329         } while ((nbytes -= bsize) >= bsize);
330 
331 done:
332         *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
333         return nbytes;
334 }
335 
336 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
337                      struct scatterlist *src, unsigned int nbytes)
338 {
339         struct blkcipher_walk walk;
340         int err;
341 
342         blkcipher_walk_init(&walk, dst, src, nbytes);
343         err = blkcipher_walk_virt_block(desc, &walk, DES3_EDE_BLOCK_SIZE);
344 
345         while ((nbytes = walk.nbytes) >= DES3_EDE_BLOCK_SIZE) {
346                 nbytes = __ctr_crypt(desc, &walk);
347                 err = blkcipher_walk_done(desc, &walk, nbytes);
348         }
349 
350         if (walk.nbytes) {
351                 ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk);
352                 err = blkcipher_walk_done(desc, &walk, 0);
353         }
354 
355         return err;
356 }
357 
358 static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
359                                unsigned int keylen)
360 {
361         struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
362         u32 i, j, tmp;
363         int err;
364 
365         /* Generate encryption context using generic implementation. */
366         err = __des3_ede_setkey(ctx->enc_expkey, &tfm->crt_flags, key, keylen);
367         if (err < 0)
368                 return err;
369 
370         /* Fix encryption context for this implementation and form decryption
371          * context. */
372         j = DES3_EDE_EXPKEY_WORDS - 2;
373         for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
374                 tmp = ror32(ctx->enc_expkey[i + 1], 4);
375                 ctx->enc_expkey[i + 1] = tmp;
376 
377                 ctx->dec_expkey[j + 0] = ctx->enc_expkey[i + 0];
378                 ctx->dec_expkey[j + 1] = tmp;
379         }
380 
381         return 0;
382 }
383 
384 static struct crypto_alg des3_ede_algs[4] = { {
385         .cra_name               = "des3_ede",
386         .cra_driver_name        = "des3_ede-asm",
387         .cra_priority           = 200,
388         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
389         .cra_blocksize          = DES3_EDE_BLOCK_SIZE,
390         .cra_ctxsize            = sizeof(struct des3_ede_x86_ctx),
391         .cra_alignmask          = 0,
392         .cra_module             = THIS_MODULE,
393         .cra_u = {
394                 .cipher = {
395                         .cia_min_keysize        = DES3_EDE_KEY_SIZE,
396                         .cia_max_keysize        = DES3_EDE_KEY_SIZE,
397                         .cia_setkey             = des3_ede_x86_setkey,
398                         .cia_encrypt            = des3_ede_x86_encrypt,
399                         .cia_decrypt            = des3_ede_x86_decrypt,
400                 }
401         }
402 }, {
403         .cra_name               = "ecb(des3_ede)",
404         .cra_driver_name        = "ecb-des3_ede-asm",
405         .cra_priority           = 300,
406         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
407         .cra_blocksize          = DES3_EDE_BLOCK_SIZE,
408         .cra_ctxsize            = sizeof(struct des3_ede_x86_ctx),
409         .cra_alignmask          = 0,
410         .cra_type               = &crypto_blkcipher_type,
411         .cra_module             = THIS_MODULE,
412         .cra_u = {
413                 .blkcipher = {
414                         .min_keysize    = DES3_EDE_KEY_SIZE,
415                         .max_keysize    = DES3_EDE_KEY_SIZE,
416                         .setkey         = des3_ede_x86_setkey,
417                         .encrypt        = ecb_encrypt,
418                         .decrypt        = ecb_decrypt,
419                 },
420         },
421 }, {
422         .cra_name               = "cbc(des3_ede)",
423         .cra_driver_name        = "cbc-des3_ede-asm",
424         .cra_priority           = 300,
425         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
426         .cra_blocksize          = DES3_EDE_BLOCK_SIZE,
427         .cra_ctxsize            = sizeof(struct des3_ede_x86_ctx),
428         .cra_alignmask          = 0,
429         .cra_type               = &crypto_blkcipher_type,
430         .cra_module             = THIS_MODULE,
431         .cra_u = {
432                 .blkcipher = {
433                         .min_keysize    = DES3_EDE_KEY_SIZE,
434                         .max_keysize    = DES3_EDE_KEY_SIZE,
435                         .ivsize         = DES3_EDE_BLOCK_SIZE,
436                         .setkey         = des3_ede_x86_setkey,
437                         .encrypt        = cbc_encrypt,
438                         .decrypt        = cbc_decrypt,
439                 },
440         },
441 }, {
442         .cra_name               = "ctr(des3_ede)",
443         .cra_driver_name        = "ctr-des3_ede-asm",
444         .cra_priority           = 300,
445         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
446         .cra_blocksize          = 1,
447         .cra_ctxsize            = sizeof(struct des3_ede_x86_ctx),
448         .cra_alignmask          = 0,
449         .cra_type               = &crypto_blkcipher_type,
450         .cra_module             = THIS_MODULE,
451         .cra_u = {
452                 .blkcipher = {
453                         .min_keysize    = DES3_EDE_KEY_SIZE,
454                         .max_keysize    = DES3_EDE_KEY_SIZE,
455                         .ivsize         = DES3_EDE_BLOCK_SIZE,
456                         .setkey         = des3_ede_x86_setkey,
457                         .encrypt        = ctr_crypt,
458                         .decrypt        = ctr_crypt,
459                 },
460         },
461 } };
462 
463 static bool is_blacklisted_cpu(void)
464 {
465         if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
466                 return false;
467 
468         if (boot_cpu_data.x86 == 0x0f) {
469                 /*
470                  * On Pentium 4, des3_ede-x86_64 is slower than generic C
471                  * implementation because use of 64bit rotates (which are really
472                  * slow on P4). Therefore blacklist P4s.
473                  */
474                 return true;
475         }
476 
477         return false;
478 }
479 
480 static int force;
481 module_param(force, int, 0);
482 MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
483 
484 static int __init des3_ede_x86_init(void)
485 {
486         if (!force && is_blacklisted_cpu()) {
487                 pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
488                 return -ENODEV;
489         }
490 
491         return crypto_register_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
492 }
493 
494 static void __exit des3_ede_x86_fini(void)
495 {
496         crypto_unregister_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp