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/algapi.h>
  30 #include <crypto/cast5.h>
  31 #include <crypto/cryptd.h>
  32 #include <crypto/ctr.h>
  33 #include <asm/xcr.h>
  34 #include <asm/xsave.h>
  35 #include <asm/crypto/ablk_helper.h>
  36 #include <asm/crypto/glue_helper.h>
  37
  38 #define CAST5_PARALLEL_BLOCKS 16
  39
  40 asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
  41                                     const u8 *src);
  42 asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  43                                     const u8 *src);
  44 asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  45                                     const u8 *src);
  46 asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
  47                                 __be64 *iv);
  48
  49 static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
  50 {
  51         return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
  52                               NULL, fpu_enabled, nbytes);
  53 }
  54
  55 static inline void cast5_fpu_end(bool fpu_enabled)
  56 {
  57         return glue_fpu_end(fpu_enabled);
  58 }
  59
  60 static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
  61                      bool enc)
  62 {
  63         bool fpu_enabled = false;
  64         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  65         const unsigned int bsize = CAST5_BLOCK_SIZE;
  66         unsigned int nbytes;
  67         void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
  68         int err;
  69
  70         fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
  71
  72         err = blkcipher_walk_virt(desc, walk);
  73         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
  74
  75         while ((nbytes = walk->nbytes)) {
  76                 u8 *wsrc = walk->src.virt.addr;
  77                 u8 *wdst = walk->dst.virt.addr;
  78
  79                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
  80
  81                 /* Process multi-block batch */
  82                 if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
  83                         do {
  84                                 fn(ctx, wdst, wsrc);
  85
  86                                 wsrc += bsize * CAST5_PARALLEL_BLOCKS;
  87                                 wdst += bsize * CAST5_PARALLEL_BLOCKS;
  88                                 nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
  89                         } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
  90
  91                         if (nbytes < bsize)
  92                                 goto done;
  93                 }
  94
  95                 fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
  96
  97                 /* Handle leftovers */
  98                 do {
  99                         fn(ctx, wdst, wsrc);
 100
 101                         wsrc += bsize;
 102                         wdst += bsize;
 103                         nbytes -= bsize;
 104                 } while (nbytes >= bsize);
 105
 106 done:
 107                 err = blkcipher_walk_done(desc, walk, nbytes);
 108         }
 109
 110         cast5_fpu_end(fpu_enabled);
 111         return err;
 112 }
 113
 114 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 115                        struct scatterlist *src, unsigned int nbytes)
 116 {
 117         struct blkcipher_walk walk;
 118
 119         blkcipher_walk_init(&walk, dst, src, nbytes);
 120         return ecb_crypt(desc, &walk, true);
 121 }
 122
 123 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 124                        struct scatterlist *src, unsigned int nbytes)
 125 {
 126         struct blkcipher_walk walk;
 127
 128         blkcipher_walk_init(&walk, dst, src, nbytes);
 129         return ecb_crypt(desc, &walk, false);
 130 }
 131
 132 static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
 133                                   struct blkcipher_walk *walk)
 134 {
 135         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 136         const unsigned int bsize = CAST5_BLOCK_SIZE;
 137         unsigned int nbytes = walk->nbytes;
 138         u64 *src = (u64 *)walk->src.virt.addr;
 139         u64 *dst = (u64 *)walk->dst.virt.addr;
 140         u64 *iv = (u64 *)walk->iv;
 141
 142         do {
 143                 *dst = *src ^ *iv;
 144                 __cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
 145                 iv = dst;
 146
 147                 src += 1;
 148                 dst += 1;
 149                 nbytes -= bsize;
 150         } while (nbytes >= bsize);
 151
 152         *(u64 *)walk->iv = *iv;
 153         return nbytes;
 154 }
 155
 156 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 157                        struct scatterlist *src, unsigned int nbytes)
 158 {
 159         struct blkcipher_walk walk;
 160         int err;
 161
 162         blkcipher_walk_init(&walk, dst, src, nbytes);
 163         err = blkcipher_walk_virt(desc, &walk);
 164
 165         while ((nbytes = walk.nbytes)) {
 166                 nbytes = __cbc_encrypt(desc, &walk);
 167                 err = blkcipher_walk_done(desc, &walk, nbytes);
 168         }
 169
 170         return err;
 171 }
 172
 173 static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
 174                                   struct blkcipher_walk *walk)
 175 {
 176         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 177         const unsigned int bsize = CAST5_BLOCK_SIZE;
 178         unsigned int nbytes = walk->nbytes;
 179         u64 *src = (u64 *)walk->src.virt.addr;
 180         u64 *dst = (u64 *)walk->dst.virt.addr;
 181         u64 last_iv;
 182
 183         /* Start of the last block. */
 184         src += nbytes / bsize - 1;
 185         dst += nbytes / bsize - 1;
 186
 187         last_iv = *src;
 188
 189         /* Process multi-block batch */
 190         if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
 191                 do {
 192                         nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
 193                         src -= CAST5_PARALLEL_BLOCKS - 1;
 194                         dst -= CAST5_PARALLEL_BLOCKS - 1;
 195
 196                         cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);
 197
 198                         nbytes -= bsize;
 199                         if (nbytes < bsize)
 200                                 goto done;
 201
 202                         *dst ^= *(src - 1);
 203                         src -= 1;
 204                         dst -= 1;
 205                 } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
 206
 207                 if (nbytes < bsize)
 208                         goto done;
 209         }
 210
 211         /* Handle leftovers */
 212         for (;;) {
 213                 __cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
 214
 215                 nbytes -= bsize;
 216                 if (nbytes < bsize)
 217                         break;
 218
 219                 *dst ^= *(src - 1);
 220                 src -= 1;
 221                 dst -= 1;
 222         }
 223
 224 done:
 225         *dst ^= *(u64 *)walk->iv;
 226         *(u64 *)walk->iv = last_iv;
 227
 228         return nbytes;
 229 }
 230
 231 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 232                        struct scatterlist *src, unsigned int nbytes)
 233 {
 234         bool fpu_enabled = false;
 235         struct blkcipher_walk walk;
 236         int err;
 237
 238         blkcipher_walk_init(&walk, dst, src, nbytes);
 239         err = blkcipher_walk_virt(desc, &walk);
 240         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 241
 242         while ((nbytes = walk.nbytes)) {
 243                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
 244                 nbytes = __cbc_decrypt(desc, &walk);
 245                 err = blkcipher_walk_done(desc, &walk, nbytes);
 246         }
 247
 248         cast5_fpu_end(fpu_enabled);
 249         return err;
 250 }
 251
 252 static void ctr_crypt_final(struct blkcipher_desc *desc,
 253                             struct blkcipher_walk *walk)
 254 {
 255         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 256         u8 *ctrblk = walk->iv;
 257         u8 keystream[CAST5_BLOCK_SIZE];
 258         u8 *src = walk->src.virt.addr;
 259         u8 *dst = walk->dst.virt.addr;
 260         unsigned int nbytes = walk->nbytes;
 261
 262         __cast5_encrypt(ctx, keystream, ctrblk);
 263         crypto_xor(keystream, src, nbytes);
 264         memcpy(dst, keystream, nbytes);
 265
 266         crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
 267 }
 268
 269 static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
 270                                 struct blkcipher_walk *walk)
 271 {
 272         struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 273         const unsigned int bsize = CAST5_BLOCK_SIZE;
 274         unsigned int nbytes = walk->nbytes;
 275         u64 *src = (u64 *)walk->src.virt.addr;
 276         u64 *dst = (u64 *)walk->dst.virt.addr;
 277
 278         /* Process multi-block batch */
 279         if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
 280                 do {
 281                         cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
 282                                         (__be64 *)walk->iv);
 283
 284                         src += CAST5_PARALLEL_BLOCKS;
 285                         dst += CAST5_PARALLEL_BLOCKS;
 286                         nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
 287                 } while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
 288
 289                 if (nbytes < bsize)
 290                         goto done;
 291         }
 292
 293         /* Handle leftovers */
 294         do {
 295                 u64 ctrblk;
 296
 297                 if (dst != src)
 298                         *dst = *src;
 299
 300                 ctrblk = *(u64 *)walk->iv;
 301                 be64_add_cpu((__be64 *)walk->iv, 1);
 302
 303                 __cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
 304                 *dst ^= ctrblk;
 305
 306                 src += 1;
 307                 dst += 1;
 308                 nbytes -= bsize;
 309         } while (nbytes >= bsize);
 310
 311 done:
 312         return nbytes;
 313 }
 314
 315 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 316                      struct scatterlist *src, unsigned int nbytes)
 317 {
 318         bool fpu_enabled = false;
 319         struct blkcipher_walk walk;
 320         int err;
 321
 322         blkcipher_walk_init(&walk, dst, src, nbytes);
 323         err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
 324         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 325
 326         while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
 327                 fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
 328                 nbytes = __ctr_crypt(desc, &walk);
 329                 err = blkcipher_walk_done(desc, &walk, nbytes);
 330         }
 331
 332         cast5_fpu_end(fpu_enabled);
 333
 334         if (walk.nbytes) {
 335                 ctr_crypt_final(desc, &walk);
 336                 err = blkcipher_walk_done(desc, &walk, 0);
 337         }
 338
 339         return err;
 340 }
 341
 342
 343 static struct crypto_alg cast5_algs[6] = { {
 344         .cra_name               = "__ecb-cast5-avx",
 345         .cra_driver_name        = "__driver-ecb-cast5-avx",
 346         .cra_priority           = 0,
 347         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 348         .cra_blocksize          = CAST5_BLOCK_SIZE,
 349         .cra_ctxsize            = sizeof(struct cast5_ctx),
 350         .cra_alignmask          = 0,
 351         .cra_type               = &crypto_blkcipher_type,
 352         .cra_module             = THIS_MODULE,
 353         .cra_u = {
 354                 .blkcipher = {
 355                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 356                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 357                         .setkey         = cast5_setkey,
 358                         .encrypt        = ecb_encrypt,
 359                         .decrypt        = ecb_decrypt,
 360                 },
 361         },
 362 }, {
 363         .cra_name               = "__cbc-cast5-avx",
 364         .cra_driver_name        = "__driver-cbc-cast5-avx",
 365         .cra_priority           = 0,
 366         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 367         .cra_blocksize          = CAST5_BLOCK_SIZE,
 368         .cra_ctxsize            = sizeof(struct cast5_ctx),
 369         .cra_alignmask          = 0,
 370         .cra_type               = &crypto_blkcipher_type,
 371         .cra_module             = THIS_MODULE,
 372         .cra_u = {
 373                 .blkcipher = {
 374                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 375                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 376                         .setkey         = cast5_setkey,
 377                         .encrypt        = cbc_encrypt,
 378                         .decrypt        = cbc_decrypt,
 379                 },
 380         },
 381 }, {
 382         .cra_name               = "__ctr-cast5-avx",
 383         .cra_driver_name        = "__driver-ctr-cast5-avx",
 384         .cra_priority           = 0,
 385         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 386         .cra_blocksize          = 1,
 387         .cra_ctxsize            = sizeof(struct cast5_ctx),
 388         .cra_alignmask          = 0,
 389         .cra_type               = &crypto_blkcipher_type,
 390         .cra_module             = THIS_MODULE,
 391         .cra_u = {
 392                 .blkcipher = {
 393                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 394                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 395                         .ivsize         = CAST5_BLOCK_SIZE,
 396                         .setkey         = cast5_setkey,
 397                         .encrypt        = ctr_crypt,
 398                         .decrypt        = ctr_crypt,
 399                 },
 400         },
 401 }, {
 402         .cra_name               = "ecb(cast5)",
 403         .cra_driver_name        = "ecb-cast5-avx",
 404         .cra_priority           = 200,
 405         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 406         .cra_blocksize          = CAST5_BLOCK_SIZE,
 407         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 408         .cra_alignmask          = 0,
 409         .cra_type               = &crypto_ablkcipher_type,
 410         .cra_module             = THIS_MODULE,
 411         .cra_init               = ablk_init,
 412         .cra_exit               = ablk_exit,
 413         .cra_u = {
 414                 .ablkcipher = {
 415                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 416                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 417                         .setkey         = ablk_set_key,
 418                         .encrypt        = ablk_encrypt,
 419                         .decrypt        = ablk_decrypt,
 420                 },
 421         },
 422 }, {
 423         .cra_name               = "cbc(cast5)",
 424         .cra_driver_name        = "cbc-cast5-avx",
 425         .cra_priority           = 200,
 426         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 427         .cra_blocksize          = CAST5_BLOCK_SIZE,
 428         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 429         .cra_alignmask          = 0,
 430         .cra_type               = &crypto_ablkcipher_type,
 431         .cra_module             = THIS_MODULE,
 432         .cra_init               = ablk_init,
 433         .cra_exit               = ablk_exit,
 434         .cra_u = {
 435                 .ablkcipher = {
 436                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 437                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 438                         .ivsize         = CAST5_BLOCK_SIZE,
 439                         .setkey         = ablk_set_key,
 440                         .encrypt        = __ablk_encrypt,
 441                         .decrypt        = ablk_decrypt,
 442                 },
 443         },
 444 }, {
 445         .cra_name               = "ctr(cast5)",
 446         .cra_driver_name        = "ctr-cast5-avx",
 447         .cra_priority           = 200,
 448         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 449         .cra_blocksize          = 1,
 450         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 451         .cra_alignmask          = 0,
 452         .cra_type               = &crypto_ablkcipher_type,
 453         .cra_module             = THIS_MODULE,
 454         .cra_init               = ablk_init,
 455         .cra_exit               = ablk_exit,
 456         .cra_u = {
 457                 .ablkcipher = {
 458                         .min_keysize    = CAST5_MIN_KEY_SIZE,
 459                         .max_keysize    = CAST5_MAX_KEY_SIZE,
 460                         .ivsize         = CAST5_BLOCK_SIZE,
 461                         .setkey         = ablk_set_key,
 462                         .encrypt        = ablk_encrypt,
 463                         .decrypt        = ablk_encrypt,
 464                         .geniv          = "chainiv",
 465                 },
 466         },
 467 } };
 468
 469 static int __init cast5_init(void)
 470 {
 471         u64 xcr0;
 472
 473         if (!cpu_has_avx || !cpu_has_osxsave) {
 474                 pr_info("AVX instructions are not detected.\n");
 475                 return -ENODEV;
 476         }
 477
 478         xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 479         if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 480                 pr_info("AVX detected but unusable.\n");
 481                 return -ENODEV;
 482         }
 483
 484         return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
 485 }
 486
 487 static void __exit cast5_exit(void)
 488 {
 489         crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
 490 }
 491
 492 module_init(cast5_init);
 493 module_exit(cast5_exit);
 494
 495 MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
 496 MODULE_LICENSE("GPL");
 497 MODULE_ALIAS("cast5");