arch/x86/crypto/cast6_avx_glue.c

   1 /*
   2  * Glue Code for the AVX assembler implemention of the Cast6 Cipher
   3  *
   4  * Copyright (C) 2012 Johannes Goetzfried
   5  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   6  *
   7  * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  * USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/hardirq.h>
  28 #include <linux/types.h>
  29 #include <linux/crypto.h>
  30 #include <linux/err.h>
  31 #include <crypto/ablk_helper.h>
  32 #include <crypto/algapi.h>
  33 #include <crypto/cast6.h>
  34 #include <crypto/cryptd.h>
  35 #include <crypto/b128ops.h>
  36 #include <crypto/ctr.h>
  37 #include <crypto/lrw.h>
  38 #include <crypto/xts.h>
  39 #include <asm/xcr.h>
  40 #include <asm/xsave.h>
  41 #include <asm/crypto/glue_helper.h>
  42
  43 #define CAST6_PARALLEL_BLOCKS 8
  44
  45 asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
  46                                    const u8 *src);
  47 asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  48                                    const u8 *src);
  49
  50 asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  51                                    const u8 *src);
  52 asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
  53                                le128 *iv);
  54
  55 asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
  56                                    const u8 *src, le128 *iv);
  57 asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  58                                    const u8 *src, le128 *iv);
  59
  60 static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  61 {
  62         glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  63                                   GLUE_FUNC_CAST(__cast6_encrypt));
  64 }
  65
  66 static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  67 {
  68         glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  69                                   GLUE_FUNC_CAST(__cast6_decrypt));
  70 }
  71
  72 static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  73 {
  74         be128 ctrblk;
  75
  76         le128_to_be128(&ctrblk, iv);
  77         le128_inc(iv);
  78
  79         __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  80         u128_xor(dst, src, (u128 *)&ctrblk);
  81 }
  82
  83 static const struct common_glue_ctx cast6_enc = {
  84         .num_funcs = 2,
  85         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  86
  87         .funcs = { {
  88                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  89                 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
  90         }, {
  91                 .num_blocks = 1,
  92                 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
  93         } }
  94 };
  95
  96 static const struct common_glue_ctx cast6_ctr = {
  97         .num_funcs = 2,
  98         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  99
 100         .funcs = { {
 101                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 102                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
 103         }, {
 104                 .num_blocks = 1,
 105                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
 106         } }
 107 };
 108
 109 static const struct common_glue_ctx cast6_enc_xts = {
 110         .num_funcs = 2,
 111         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 112
 113         .funcs = { {
 114                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 115                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
 116         }, {
 117                 .num_blocks = 1,
 118                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
 119         } }
 120 };
 121
 122 static const struct common_glue_ctx cast6_dec = {
 123         .num_funcs = 2,
 124         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 125
 126         .funcs = { {
 127                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 128                 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
 129         }, {
 130                 .num_blocks = 1,
 131                 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
 132         } }
 133 };
 134
 135 static const struct common_glue_ctx cast6_dec_cbc = {
 136         .num_funcs = 2,
 137         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 138
 139         .funcs = { {
 140                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 141                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
 142         }, {
 143                 .num_blocks = 1,
 144                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
 145         } }
 146 };
 147
 148 static const struct common_glue_ctx cast6_dec_xts = {
 149         .num_funcs = 2,
 150         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 151
 152         .funcs = { {
 153                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 154                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
 155         }, {
 156                 .num_blocks = 1,
 157                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
 158         } }
 159 };
 160
 161 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 162                        struct scatterlist *src, unsigned int nbytes)
 163 {
 164         return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
 165 }
 166
 167 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 168                        struct scatterlist *src, unsigned int nbytes)
 169 {
 170         return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
 171 }
 172
 173 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 174                        struct scatterlist *src, unsigned int nbytes)
 175 {
 176         return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
 177                                        dst, src, nbytes);
 178 }
 179
 180 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 181                        struct scatterlist *src, unsigned int nbytes)
 182 {
 183         return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
 184                                        nbytes);
 185 }
 186
 187 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 188                      struct scatterlist *src, unsigned int nbytes)
 189 {
 190         return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
 191 }
 192
 193 static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 194 {
 195         return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
 196                               NULL, fpu_enabled, nbytes);
 197 }
 198
 199 static inline void cast6_fpu_end(bool fpu_enabled)
 200 {
 201         glue_fpu_end(fpu_enabled);
 202 }
 203
 204 struct crypt_priv {
 205         struct cast6_ctx *ctx;
 206         bool fpu_enabled;
 207 };
 208
 209 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 210 {
 211         const unsigned int bsize = CAST6_BLOCK_SIZE;
 212         struct crypt_priv *ctx = priv;
 213         int i;
 214
 215         ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
 216
 217         if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
 218                 cast6_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
 219                 return;
 220         }
 221
 222         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 223                 __cast6_encrypt(ctx->ctx, srcdst, srcdst);
 224 }
 225
 226 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 227 {
 228         const unsigned int bsize = CAST6_BLOCK_SIZE;
 229         struct crypt_priv *ctx = priv;
 230         int i;
 231
 232         ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
 233
 234         if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
 235                 cast6_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
 236                 return;
 237         }
 238
 239         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 240                 __cast6_decrypt(ctx->ctx, srcdst, srcdst);
 241 }
 242
 243 struct cast6_lrw_ctx {
 244         struct lrw_table_ctx lrw_table;
 245         struct cast6_ctx cast6_ctx;
 246 };
 247
 248 static int lrw_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
 249                               unsigned int keylen)
 250 {
 251         struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 252         int err;
 253
 254         err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
 255                              &tfm->crt_flags);
 256         if (err)
 257                 return err;
 258
 259         return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
 260 }
 261
 262 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 263                        struct scatterlist *src, unsigned int nbytes)
 264 {
 265         struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 266         be128 buf[CAST6_PARALLEL_BLOCKS];
 267         struct crypt_priv crypt_ctx = {
 268                 .ctx = &ctx->cast6_ctx,
 269                 .fpu_enabled = false,
 270         };
 271         struct lrw_crypt_req req = {
 272                 .tbuf = buf,
 273                 .tbuflen = sizeof(buf),
 274
 275                 .table_ctx = &ctx->lrw_table,
 276                 .crypt_ctx = &crypt_ctx,
 277                 .crypt_fn = encrypt_callback,
 278         };
 279         int ret;
 280
 281         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 282         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 283         cast6_fpu_end(crypt_ctx.fpu_enabled);
 284
 285         return ret;
 286 }
 287
 288 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 289                        struct scatterlist *src, unsigned int nbytes)
 290 {
 291         struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 292         be128 buf[CAST6_PARALLEL_BLOCKS];
 293         struct crypt_priv crypt_ctx = {
 294                 .ctx = &ctx->cast6_ctx,
 295                 .fpu_enabled = false,
 296         };
 297         struct lrw_crypt_req req = {
 298                 .tbuf = buf,
 299                 .tbuflen = sizeof(buf),
 300
 301                 .table_ctx = &ctx->lrw_table,
 302                 .crypt_ctx = &crypt_ctx,
 303                 .crypt_fn = decrypt_callback,
 304         };
 305         int ret;
 306
 307         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 308         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 309         cast6_fpu_end(crypt_ctx.fpu_enabled);
 310
 311         return ret;
 312 }
 313
 314 static void lrw_exit_tfm(struct crypto_tfm *tfm)
 315 {
 316         struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 317
 318         lrw_free_table(&ctx->lrw_table);
 319 }
 320
 321 struct cast6_xts_ctx {
 322         struct cast6_ctx tweak_ctx;
 323         struct cast6_ctx crypt_ctx;
 324 };
 325
 326 static int xts_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
 327                               unsigned int keylen)
 328 {
 329         struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
 330         u32 *flags = &tfm->crt_flags;
 331         int err;
 332
 333         /* key consists of keys of equal size concatenated, therefore
 334          * the length must be even
 335          */
 336         if (keylen % 2) {
 337                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 338                 return -EINVAL;
 339         }
 340
 341         /* first half of xts-key is for crypt */
 342         err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
 343         if (err)
 344                 return err;
 345
 346         /* second half of xts-key is for tweak */
 347         return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
 348                               flags);
 349 }
 350
 351 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 352                        struct scatterlist *src, unsigned int nbytes)
 353 {
 354         struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 355
 356         return glue_xts_crypt_128bit(&cast6_enc_xts, desc, dst, src, nbytes,
 357                                      XTS_TWEAK_CAST(__cast6_encrypt),
 358                                      &ctx->tweak_ctx, &ctx->crypt_ctx);
 359 }
 360
 361 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 362                        struct scatterlist *src, unsigned int nbytes)
 363 {
 364         struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 365
 366         return glue_xts_crypt_128bit(&cast6_dec_xts, desc, dst, src, nbytes,
 367                                      XTS_TWEAK_CAST(__cast6_encrypt),
 368                                      &ctx->tweak_ctx, &ctx->crypt_ctx);
 369 }
 370
 371 static struct crypto_alg cast6_algs[10] = { {
 372         .cra_name               = "__ecb-cast6-avx",
 373         .cra_driver_name        = "__driver-ecb-cast6-avx",
 374         .cra_priority           = 0,
 375         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 376         .cra_blocksize          = CAST6_BLOCK_SIZE,
 377         .cra_ctxsize            = sizeof(struct cast6_ctx),
 378         .cra_alignmask          = 0,
 379         .cra_type               = &crypto_blkcipher_type,
 380         .cra_module             = THIS_MODULE,
 381         .cra_u = {
 382                 .blkcipher = {
 383                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 384                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 385                         .setkey         = cast6_setkey,
 386                         .encrypt        = ecb_encrypt,
 387                         .decrypt        = ecb_decrypt,
 388                 },
 389         },
 390 }, {
 391         .cra_name               = "__cbc-cast6-avx",
 392         .cra_driver_name        = "__driver-cbc-cast6-avx",
 393         .cra_priority           = 0,
 394         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 395         .cra_blocksize          = CAST6_BLOCK_SIZE,
 396         .cra_ctxsize            = sizeof(struct cast6_ctx),
 397         .cra_alignmask          = 0,
 398         .cra_type               = &crypto_blkcipher_type,
 399         .cra_module             = THIS_MODULE,
 400         .cra_u = {
 401                 .blkcipher = {
 402                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 403                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 404                         .setkey         = cast6_setkey,
 405                         .encrypt        = cbc_encrypt,
 406                         .decrypt        = cbc_decrypt,
 407                 },
 408         },
 409 }, {
 410         .cra_name               = "__ctr-cast6-avx",
 411         .cra_driver_name        = "__driver-ctr-cast6-avx",
 412         .cra_priority           = 0,
 413         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 414         .cra_blocksize          = 1,
 415         .cra_ctxsize            = sizeof(struct cast6_ctx),
 416         .cra_alignmask          = 0,
 417         .cra_type               = &crypto_blkcipher_type,
 418         .cra_module             = THIS_MODULE,
 419         .cra_u = {
 420                 .blkcipher = {
 421                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 422                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 423                         .ivsize         = CAST6_BLOCK_SIZE,
 424                         .setkey         = cast6_setkey,
 425                         .encrypt        = ctr_crypt,
 426                         .decrypt        = ctr_crypt,
 427                 },
 428         },
 429 }, {
 430         .cra_name               = "__lrw-cast6-avx",
 431         .cra_driver_name        = "__driver-lrw-cast6-avx",
 432         .cra_priority           = 0,
 433         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 434         .cra_blocksize          = CAST6_BLOCK_SIZE,
 435         .cra_ctxsize            = sizeof(struct cast6_lrw_ctx),
 436         .cra_alignmask          = 0,
 437         .cra_type               = &crypto_blkcipher_type,
 438         .cra_module             = THIS_MODULE,
 439         .cra_exit               = lrw_exit_tfm,
 440         .cra_u = {
 441                 .blkcipher = {
 442                         .min_keysize    = CAST6_MIN_KEY_SIZE +
 443                                           CAST6_BLOCK_SIZE,
 444                         .max_keysize    = CAST6_MAX_KEY_SIZE +
 445                                           CAST6_BLOCK_SIZE,
 446                         .ivsize         = CAST6_BLOCK_SIZE,
 447                         .setkey         = lrw_cast6_setkey,
 448                         .encrypt        = lrw_encrypt,
 449                         .decrypt        = lrw_decrypt,
 450                 },
 451         },
 452 }, {
 453         .cra_name               = "__xts-cast6-avx",
 454         .cra_driver_name        = "__driver-xts-cast6-avx",
 455         .cra_priority           = 0,
 456         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 457         .cra_blocksize          = CAST6_BLOCK_SIZE,
 458         .cra_ctxsize            = sizeof(struct cast6_xts_ctx),
 459         .cra_alignmask          = 0,
 460         .cra_type               = &crypto_blkcipher_type,
 461         .cra_module             = THIS_MODULE,
 462         .cra_u = {
 463                 .blkcipher = {
 464                         .min_keysize    = CAST6_MIN_KEY_SIZE * 2,
 465                         .max_keysize    = CAST6_MAX_KEY_SIZE * 2,
 466                         .ivsize         = CAST6_BLOCK_SIZE,
 467                         .setkey         = xts_cast6_setkey,
 468                         .encrypt        = xts_encrypt,
 469                         .decrypt        = xts_decrypt,
 470                 },
 471         },
 472 }, {
 473         .cra_name               = "ecb(cast6)",
 474         .cra_driver_name        = "ecb-cast6-avx",
 475         .cra_priority           = 200,
 476         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 477         .cra_blocksize          = CAST6_BLOCK_SIZE,
 478         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 479         .cra_alignmask          = 0,
 480         .cra_type               = &crypto_ablkcipher_type,
 481         .cra_module             = THIS_MODULE,
 482         .cra_init               = ablk_init,
 483         .cra_exit               = ablk_exit,
 484         .cra_u = {
 485                 .ablkcipher = {
 486                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 487                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 488                         .setkey         = ablk_set_key,
 489                         .encrypt        = ablk_encrypt,
 490                         .decrypt        = ablk_decrypt,
 491                 },
 492         },
 493 }, {
 494         .cra_name               = "cbc(cast6)",
 495         .cra_driver_name        = "cbc-cast6-avx",
 496         .cra_priority           = 200,
 497         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 498         .cra_blocksize          = CAST6_BLOCK_SIZE,
 499         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 500         .cra_alignmask          = 0,
 501         .cra_type               = &crypto_ablkcipher_type,
 502         .cra_module             = THIS_MODULE,
 503         .cra_init               = ablk_init,
 504         .cra_exit               = ablk_exit,
 505         .cra_u = {
 506                 .ablkcipher = {
 507                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 508                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 509                         .ivsize         = CAST6_BLOCK_SIZE,
 510                         .setkey         = ablk_set_key,
 511                         .encrypt        = __ablk_encrypt,
 512                         .decrypt        = ablk_decrypt,
 513                 },
 514         },
 515 }, {
 516         .cra_name               = "ctr(cast6)",
 517         .cra_driver_name        = "ctr-cast6-avx",
 518         .cra_priority           = 200,
 519         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 520         .cra_blocksize          = 1,
 521         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 522         .cra_alignmask          = 0,
 523         .cra_type               = &crypto_ablkcipher_type,
 524         .cra_module             = THIS_MODULE,
 525         .cra_init               = ablk_init,
 526         .cra_exit               = ablk_exit,
 527         .cra_u = {
 528                 .ablkcipher = {
 529                         .min_keysize    = CAST6_MIN_KEY_SIZE,
 530                         .max_keysize    = CAST6_MAX_KEY_SIZE,
 531                         .ivsize         = CAST6_BLOCK_SIZE,
 532                         .setkey         = ablk_set_key,
 533                         .encrypt        = ablk_encrypt,
 534                         .decrypt        = ablk_encrypt,
 535                         .geniv          = "chainiv",
 536                 },
 537         },
 538 }, {
 539         .cra_name               = "lrw(cast6)",
 540         .cra_driver_name        = "lrw-cast6-avx",
 541         .cra_priority           = 200,
 542         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 543         .cra_blocksize          = CAST6_BLOCK_SIZE,
 544         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 545         .cra_alignmask          = 0,
 546         .cra_type               = &crypto_ablkcipher_type,
 547         .cra_module             = THIS_MODULE,
 548         .cra_init               = ablk_init,
 549         .cra_exit               = ablk_exit,
 550         .cra_u = {
 551                 .ablkcipher = {
 552                         .min_keysize    = CAST6_MIN_KEY_SIZE +
 553                                           CAST6_BLOCK_SIZE,
 554                         .max_keysize    = CAST6_MAX_KEY_SIZE +
 555                                           CAST6_BLOCK_SIZE,
 556                         .ivsize         = CAST6_BLOCK_SIZE,
 557                         .setkey         = ablk_set_key,
 558                         .encrypt        = ablk_encrypt,
 559                         .decrypt        = ablk_decrypt,
 560                 },
 561         },
 562 }, {
 563         .cra_name               = "xts(cast6)",
 564         .cra_driver_name        = "xts-cast6-avx",
 565         .cra_priority           = 200,
 566         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 567         .cra_blocksize          = CAST6_BLOCK_SIZE,
 568         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 569         .cra_alignmask          = 0,
 570         .cra_type               = &crypto_ablkcipher_type,
 571         .cra_module             = THIS_MODULE,
 572         .cra_init               = ablk_init,
 573         .cra_exit               = ablk_exit,
 574         .cra_u = {
 575                 .ablkcipher = {
 576                         .min_keysize    = CAST6_MIN_KEY_SIZE * 2,
 577                         .max_keysize    = CAST6_MAX_KEY_SIZE * 2,
 578                         .ivsize         = CAST6_BLOCK_SIZE,
 579                         .setkey         = ablk_set_key,
 580                         .encrypt        = ablk_encrypt,
 581                         .decrypt        = ablk_decrypt,
 582                 },
 583         },
 584 } };
 585
 586 static int __init cast6_init(void)
 587 {
 588         u64 xcr0;
 589
 590         if (!cpu_has_avx || !cpu_has_osxsave) {
 591                 pr_info("AVX instructions are not detected.\n");
 592                 return -ENODEV;
 593         }
 594
 595         xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 596         if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 597                 pr_info("AVX detected but unusable.\n");
 598                 return -ENODEV;
 599         }
 600
 601         return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
 602 }
 603
 604 static void __exit cast6_exit(void)
 605 {
 606         crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
 607 }
 608
 609 module_init(cast6_init);
 610 module_exit(cast6_exit);
 611
 612 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
 613 MODULE_LICENSE("GPL");
 614 MODULE_ALIAS("cast6");