arch/x86/crypto/cast5_avx_glue.c

   1 /*
   2  * Glue Code for the AVX assembler implemention of the Cast5 Cipher
   3  *
   4  * Copyright (C) 2012 Johannes Goetzfried
   5  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  20  * USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/hardirq.h>
  26 #include <linux/types.h>
  27 #include <linux/crypto.h>
  28 #include <linux/err.h>
  29 #include <crypto/ablk_helper.h>
  30 #include <crypto/algapi.h>
  31 #include <crypto/cast5.h>
  32 #include <crypto/cryptd.h>
  33 #include <crypto/ctr.h>
  34 #include <asm/fpu/api.h>
  35 #include <asm/crypto/glue_helper.h>
  36
  37 #define CAST5_PARALLEL_BLOCKS 16
  38
  39 asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
  40                                     const u8 *src);
  41 asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  42                                     const u8 *src);
  43 asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  44                                     const u8 *src);
  45 asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
  46                                 __be64 *iv);
  47
  48 static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
  49 {
  50         return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
  51                               NULL, fpu_enabled, nbytes);
  52 }
  53
  54 static inline void cast5_fpu_end(bool fpu_enabled)
  55 {
  56         return glue_fpu_end(fpu_enabled);
  57 }
  58
  59 static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
  60                      bool enc)
  61 {
  62         bool fpu_enabled = false;
  63         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  64         const unsigned int bsize = CAST5_BLOCK_SIZE;
  65         unsigned int nbytes;
  66         void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
  67         int err;
  68
  69         fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
  70
  71         err = blkcipher_walk_virt(desc, walk);
  72         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
  73
  74         while ((nbytes = walk->nbytes)) {
  75                 u8 *wsrc = walk->src.virt.addr;
  76                 u8 *wdst = walk->dst.virt.addr;
  77
  78                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
  79
  80                 /* Process multi-block batch */
  81                 if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
  82                         do {
  83                                 fn(ctx, wdst, wsrc);
  84
  85                                 wsrc += bsize * CAST5_PARALLEL_BLOCKS;
  86                                 wdst += bsize * CAST5_PARALLEL_BLOCKS;
  87                                 nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
  88                         } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
  89
  90                         if (nbytes < bsize)
  91                                 goto done;
  92                 }
  93
  94                 fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
  95
  96                 /* Handle leftovers */
  97                 do {
  98                         fn(ctx, wdst, wsrc);
  99
 100                         wsrc += bsize;
 101                         wdst += bsize;
 102                         nbytes -= bsize;
 103                 } while (nbytes >= bsize);
 104
 105 done:
 106                 err = blkcipher_walk_done(desc, walk, nbytes);
 107         }
 108
 109         cast5_fpu_end(fpu_enabled);
 110         return err;
 111 }
 112
 113 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 114                        struct scatterlist *src, unsigned int nbytes)
 115 {
 116         struct blkcipher_walk walk;
 117
 118         blkcipher_walk_init(&walk, dst, src, nbytes);
 119         return ecb_crypt(desc, &walk, true);
 120 }
 121
 122 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 123                        struct scatterlist *src, unsigned int nbytes)
 124 {
 125         struct blkcipher_walk walk;
 126
 127         blkcipher_walk_init(&walk, dst, src, nbytes);
 128         return ecb_crypt(desc, &walk, false);
 129 }
 130
 131 static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
 132                                   struct blkcipher_walk *walk)
 133 {
 134         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 135         const unsigned int bsize = CAST5_BLOCK_SIZE;
 136         unsigned int nbytes = walk->nbytes;
 137         u64 *src = (u64 *)walk->src.virt.addr;
 138         u64 *dst = (u64 *)walk->dst.virt.addr;
 139         u64 *iv = (u64 *)walk->iv;
 140
 141         do {
 142                 *dst = *src ^ *iv;
 143                 __cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
 144                 iv = dst;
 145
 146                 src += 1;
 147                 dst += 1;
 148                 nbytes -= bsize;
 149         } while (nbytes >= bsize);
 150
 151         *(u64 *)walk->iv = *iv;
 152         return nbytes;
 153 }
 154
 155 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 156                        struct scatterlist *src, unsigned int nbytes)
 157 {
 158         struct blkcipher_walk walk;
 159         int err;
 160
 161         blkcipher_walk_init(&walk, dst, src, nbytes);
 162         err = blkcipher_walk_virt(desc, &walk);
 163
 164         while ((nbytes = walk.nbytes)) {
 165                 nbytes = __cbc_encrypt(desc, &walk);
 166                 err = blkcipher_walk_done(desc, &walk, nbytes);
 167         }
 168
 169         return err;
 170 }
 171
 172 static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
 173                                   struct blkcipher_walk *walk)
 174 {
 175         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 176         const unsigned int bsize = CAST5_BLOCK_SIZE;
 177         unsigned int nbytes = walk->nbytes;
 178         u64 *src = (u64 *)walk->src.virt.addr;
 179         u64 *dst = (u64 *)walk->dst.virt.addr;
 180         u64 last_iv;
 181
 182         /* Start of the last block. */
 183         src += nbytes / bsize - 1;
 184         dst += nbytes / bsize - 1;
 185
 186         last_iv = *src;
 187
 188         /* Process multi-block batch */
 189         if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
 190                 do {
 191                         nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
 192                         src -= CAST5_PARALLEL_BLOCKS - 1;
 193                         dst -= CAST5_PARALLEL_BLOCKS - 1;
 194
 195                         cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);
 196
 197                         nbytes -= bsize;
 198                         if (nbytes < bsize)
 199                                 goto done;
 200
 201                         *dst ^= *(src - 1);
 202                         src -= 1;
 203                         dst -= 1;
 204                 } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
 205         }
 206
 207         /* Handle leftovers */
 208         for (;;) {
 209                 __cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
 210
 211                 nbytes -= bsize;
 212                 if (nbytes < bsize)
 213                         break;
 214
 215                 *dst ^= *(src - 1);
 216                 src -= 1;
 217                 dst -= 1;
 218         }
 219
 220 done:
 221         *dst ^= *(u64 *)walk->iv;
 222         *(u64 *)walk->iv = last_iv;
 223
 224         return nbytes;
 225 }
 226
 227 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 228                        struct scatterlist *src, unsigned int nbytes)
 229 {
 230         bool fpu_enabled = false;
 231         struct blkcipher_walk walk;
 232         int err;
 233
 234         blkcipher_walk_init(&walk, dst, src, nbytes);
 235         err = blkcipher_walk_virt(desc, &walk);
 236         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 237
 238         while ((nbytes = walk.nbytes)) {
 239                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
 240                 nbytes = __cbc_decrypt(desc, &walk);
 241                 err = blkcipher_walk_done(desc, &walk, nbytes);
 242         }
 243
 244         cast5_fpu_end(fpu_enabled);
 245         return err;
 246 }
 247
 248 static void ctr_crypt_final(struct blkcipher_desc *desc,
 249                             struct blkcipher_walk *walk)
 250 {
 251         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 252         u8 *ctrblk = walk->iv;
 253         u8 keystream[CAST5_BLOCK_SIZE];
 254         u8 *src = walk->src.virt.addr;
 255         u8 *dst = walk->dst.virt.addr;
 256         unsigned int nbytes = walk->nbytes;
 257
 258         __cast5_encrypt(ctx, keystream, ctrblk);
 259         crypto_xor(keystream, src, nbytes);
 260         memcpy(dst, keystream, nbytes);
 261
 262         crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
 263 }
 264
 265 static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
 266                                 struct blkcipher_walk *walk)
 267 {
 268         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 269         const unsigned int bsize = CAST5_BLOCK_SIZE;
 270         unsigned int nbytes = walk->nbytes;
 271         u64 *src = (u64 *)walk->src.virt.addr;
 272         u64 *dst = (u64 *)walk->dst.virt.addr;
 273
 274         /* Process multi-block batch */
 275         if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
 276                 do {
 277                         cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
 278                                         (__be64 *)walk->iv);
 279
 280                         src += CAST5_PARALLEL_BLOCKS;
 281                         dst += CAST5_PARALLEL_BLOCKS;
 282                         nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
 283                 } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
 284
 285                 if (nbytes < bsize)
 286                         goto done;
 287         }
 288
 289         /* Handle leftovers */
 290         do {
 291                 u64 ctrblk;
 292
 293                 if (dst != src)
 294                         *dst = *src;
 295
 296                 ctrblk = *(u64 *)walk->iv;
 297                 be64_add_cpu((__be64 *)walk->iv, 1);
 298
 299                 __cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
 300                 *dst ^= ctrblk;
 301
 302                 src += 1;
 303                 dst += 1;
 304                 nbytes -= bsize;
 305         } while (nbytes >= bsize);
 306
 307 done:
 308         return nbytes;
 309 }
 310
 311 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 312                      struct scatterlist *src, unsigned int nbytes)
 313 {
 314         bool fpu_enabled = false;
 315         struct blkcipher_walk walk;
 316         int err;
 317
 318         blkcipher_walk_init(&walk, dst, src, nbytes);
 319         err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
 320         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 321
 322         while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
 323                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
 324                 nbytes = __ctr_crypt(desc, &walk);
 325                 err = blkcipher_walk_done(desc, &walk, nbytes);
 326         }
 327
 328         cast5_fpu_end(fpu_enabled);
 329
 330         if (walk.nbytes) {
 331                 ctr_crypt_final(desc, &walk);
 332                 err = blkcipher_walk_done(desc, &walk, 0);
 333         }
 334
 335         return err;
 336 }
 337
 338
 339 static struct crypto_alg cast5_algs[6] = { {
 340         .cra_name               = "__ecb-cast5-avx",
 341         .cra_driver_name        = "__driver-ecb-cast5-avx",
 342         .cra_priority           = 0,
 343         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 344                                   CRYPTO_ALG_INTERNAL,
 345         .cra_blocksize          = CAST5_BLOCK_SIZE,
 346         .cra_ctxsize            = sizeof(struct cast5_ctx),
 347         .cra_alignmask          = 0,
 348         .cra_type               = &crypto_blkcipher_type,
 349         .cra_module             = THIS_MODULE,
 350         .cra_u = {
 351                 .blkcipher = {
 352                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 353                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 354                         .setkey         = cast5_setkey,
 355                         .encrypt        = ecb_encrypt,
 356                         .decrypt        = ecb_decrypt,
 357                 },
 358         },
 359 }, {
 360         .cra_name               = "__cbc-cast5-avx",
 361         .cra_driver_name        = "__driver-cbc-cast5-avx",
 362         .cra_priority           = 0,
 363         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 364                                   CRYPTO_ALG_INTERNAL,
 365         .cra_blocksize          = CAST5_BLOCK_SIZE,
 366         .cra_ctxsize            = sizeof(struct cast5_ctx),
 367         .cra_alignmask          = 0,
 368         .cra_type               = &crypto_blkcipher_type,
 369         .cra_module             = THIS_MODULE,
 370         .cra_u = {
 371                 .blkcipher = {
 372                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 373                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 374                         .setkey         = cast5_setkey,
 375                         .encrypt        = cbc_encrypt,
 376                         .decrypt        = cbc_decrypt,
 377                 },
 378         },
 379 }, {
 380         .cra_name               = "__ctr-cast5-avx",
 381         .cra_driver_name        = "__driver-ctr-cast5-avx",
 382         .cra_priority           = 0,
 383         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 384                                   CRYPTO_ALG_INTERNAL,
 385         .cra_blocksize          = 1,
 386         .cra_ctxsize            = sizeof(struct cast5_ctx),
 387         .cra_alignmask          = 0,
 388         .cra_type               = &crypto_blkcipher_type,
 389         .cra_module             = THIS_MODULE,
 390         .cra_u = {
 391                 .blkcipher = {
 392                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 393                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 394                         .ivsize         = CAST5_BLOCK_SIZE,
 395                         .setkey         = cast5_setkey,
 396                         .encrypt        = ctr_crypt,
 397                         .decrypt        = ctr_crypt,
 398                 },
 399         },
 400 }, {
 401         .cra_name               = "ecb(cast5)",
 402         .cra_driver_name        = "ecb-cast5-avx",
 403         .cra_priority           = 200,
 404         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 405         .cra_blocksize          = CAST5_BLOCK_SIZE,
 406         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 407         .cra_alignmask          = 0,
 408         .cra_type               = &crypto_ablkcipher_type,
 409         .cra_module             = THIS_MODULE,
 410         .cra_init               = ablk_init,
 411         .cra_exit               = ablk_exit,
 412         .cra_u = {
 413                 .ablkcipher = {
 414                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 415                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 416                         .setkey         = ablk_set_key,
 417                         .encrypt        = ablk_encrypt,
 418                         .decrypt        = ablk_decrypt,
 419                 },
 420         },
 421 }, {
 422         .cra_name               = "cbc(cast5)",
 423         .cra_driver_name        = "cbc-cast5-avx",
 424         .cra_priority           = 200,
 425         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 426         .cra_blocksize          = CAST5_BLOCK_SIZE,
 427         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 428         .cra_alignmask          = 0,
 429         .cra_type               = &crypto_ablkcipher_type,
 430         .cra_module             = THIS_MODULE,
 431         .cra_init               = ablk_init,
 432         .cra_exit               = ablk_exit,
 433         .cra_u = {
 434                 .ablkcipher = {
 435                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 436                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 437                         .ivsize         = CAST5_BLOCK_SIZE,
 438                         .setkey         = ablk_set_key,
 439                         .encrypt        = __ablk_encrypt,
 440                         .decrypt        = ablk_decrypt,
 441                 },
 442         },
 443 }, {
 444         .cra_name               = "ctr(cast5)",
 445         .cra_driver_name        = "ctr-cast5-avx",
 446         .cra_priority           = 200,
 447         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 448         .cra_blocksize          = 1,
 449         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 450         .cra_alignmask          = 0,
 451         .cra_type               = &crypto_ablkcipher_type,
 452         .cra_module             = THIS_MODULE,
 453         .cra_init               = ablk_init,
 454         .cra_exit               = ablk_exit,
 455         .cra_u = {
 456                 .ablkcipher = {
 457                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 458                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 459                         .ivsize         = CAST5_BLOCK_SIZE,
 460                         .setkey         = ablk_set_key,
 461                         .encrypt        = ablk_encrypt,
 462                         .decrypt        = ablk_encrypt,
 463                         .geniv          = "chainiv",
 464                 },
 465         },
 466 } };
 467
 468 static int __init cast5_init(void)
 469 {
 470         const char *feature_name;
 471
 472         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 473                                 &feature_name)) {
 474                 pr_info("CPU feature '%s' is not supported.\n", feature_name);
 475                 return -ENODEV;
 476         }
 477
 478         return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
 479 }
 480
 481 static void __exit cast5_exit(void)
 482 {
 483         crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
 484 }
 485
 486 module_init(cast5_init);
 487 module_exit(cast5_exit);
 488
 489 MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
 490 MODULE_LICENSE("GPL");
 491 MODULE_ALIAS_CRYPTO("cast5");