Pileus Git - ~andy/linux/blob - arch/x86/crypto/serpent_avx_glue.c

   1 /*
   2  * Glue Code for AVX assembler versions of Serpent Cipher
   3  *
   4  * Copyright (C) 2012 Johannes Goetzfried
   5  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   6  *
   7  * Glue code based on serpent_sse2_glue.c by:
   8  *  Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  23  * USA
  24  *
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/hardirq.h>
  29 #include <linux/types.h>
  30 #include <linux/crypto.h>
  31 #include <linux/err.h>
  32 #include <crypto/algapi.h>
  33 #include <crypto/serpent.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/serpent-avx.h>
  42 #include <asm/crypto/ablk_helper.h>
  43 #include <asm/crypto/glue_helper.h>
  44
  45 static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
  46 {
  47         u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
  48         unsigned int j;
  49
  50         for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
  51                 ivs[j] = src[j];
  52
  53         serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
  54
  55         for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
  56                 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
  57 }
  58
  59 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
  60 {
  61         be128 ctrblk;
  62
  63         u128_to_be128(&ctrblk, iv);
  64         u128_inc(iv);
  65
  66         __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  67         u128_xor(dst, src, (u128 *)&ctrblk);
  68 }
  69
  70 static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
  71                                    u128 *iv)
  72 {
  73         be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
  74         unsigned int i;
  75
  76         for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
  77                 if (dst != src)
  78                         dst[i] = src[i];
  79
  80                 u128_to_be128(&ctrblks[i], iv);
  81                 u128_inc(iv);
  82         }
  83
  84         serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
  85 }
  86
  87 static const struct common_glue_ctx serpent_enc = {
  88         .num_funcs = 2,
  89         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  90
  91         .funcs = { {
  92                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
  93                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
  94         }, {
  95                 .num_blocks = 1,
  96                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
  97         } }
  98 };
  99
 100 static const struct common_glue_ctx serpent_ctr = {
 101         .num_funcs = 2,
 102         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 103
 104         .funcs = { {
 105                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 106                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
 107         }, {
 108                 .num_blocks = 1,
 109                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
 110         } }
 111 };
 112
 113 static const struct common_glue_ctx serpent_dec = {
 114         .num_funcs = 2,
 115         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 116
 117         .funcs = { {
 118                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 119                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
 120         }, {
 121                 .num_blocks = 1,
 122                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
 123         } }
 124 };
 125
 126 static const struct common_glue_ctx serpent_dec_cbc = {
 127         .num_funcs = 2,
 128         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 129
 130         .funcs = { {
 131                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 132                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
 133         }, {
 134                 .num_blocks = 1,
 135                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
 136         } }
 137 };
 138
 139 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 140                        struct scatterlist *src, unsigned int nbytes)
 141 {
 142         return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
 143 }
 144
 145 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 146                        struct scatterlist *src, unsigned int nbytes)
 147 {
 148         return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
 149 }
 150
 151 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 152                        struct scatterlist *src, unsigned int nbytes)
 153 {
 154         return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
 155                                      dst, src, nbytes);
 156 }
 157
 158 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 159                        struct scatterlist *src, unsigned int nbytes)
 160 {
 161         return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
 162                                        nbytes);
 163 }
 164
 165 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 166                      struct scatterlist *src, unsigned int nbytes)
 167 {
 168         return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 169 }
 170
 171 static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 172 {
 173         return glue_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
 174                               NULL, fpu_enabled, nbytes);
 175 }
 176
 177 static inline void serpent_fpu_end(bool fpu_enabled)
 178 {
 179         glue_fpu_end(fpu_enabled);
 180 }
 181
 182 struct crypt_priv {
 183         struct serpent_ctx *ctx;
 184         bool fpu_enabled;
 185 };
 186
 187 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 188 {
 189         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 190         struct crypt_priv *ctx = priv;
 191         int i;
 192
 193         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 194
 195         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 196                 serpent_enc_blk_xway(ctx->ctx, srcdst, srcdst);
 197                 return;
 198         }
 199
 200         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 201                 __serpent_encrypt(ctx->ctx, srcdst, srcdst);
 202 }
 203
 204 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 205 {
 206         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 207         struct crypt_priv *ctx = priv;
 208         int i;
 209
 210         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 211
 212         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 213                 serpent_dec_blk_xway(ctx->ctx, srcdst, srcdst);
 214                 return;
 215         }
 216
 217         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 218                 __serpent_decrypt(ctx->ctx, srcdst, srcdst);
 219 }
 220
 221 struct serpent_lrw_ctx {
 222         struct lrw_table_ctx lrw_table;
 223         struct serpent_ctx serpent_ctx;
 224 };
 225
 226 static int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 227                               unsigned int keylen)
 228 {
 229         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 230         int err;
 231
 232         err = __serpent_setkey(&ctx->serpent_ctx, key, keylen -
 233                                                         SERPENT_BLOCK_SIZE);
 234         if (err)
 235                 return err;
 236
 237         return lrw_init_table(&ctx->lrw_table, key + keylen -
 238                                                 SERPENT_BLOCK_SIZE);
 239 }
 240
 241 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 242                        struct scatterlist *src, unsigned int nbytes)
 243 {
 244         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 245         be128 buf[SERPENT_PARALLEL_BLOCKS];
 246         struct crypt_priv crypt_ctx = {
 247                 .ctx = &ctx->serpent_ctx,
 248                 .fpu_enabled = false,
 249         };
 250         struct lrw_crypt_req req = {
 251                 .tbuf = buf,
 252                 .tbuflen = sizeof(buf),
 253
 254                 .table_ctx = &ctx->lrw_table,
 255                 .crypt_ctx = &crypt_ctx,
 256                 .crypt_fn = encrypt_callback,
 257         };
 258         int ret;
 259
 260         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 261         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 262         serpent_fpu_end(crypt_ctx.fpu_enabled);
 263
 264         return ret;
 265 }
 266
 267 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 268                        struct scatterlist *src, unsigned int nbytes)
 269 {
 270         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 271         be128 buf[SERPENT_PARALLEL_BLOCKS];
 272         struct crypt_priv crypt_ctx = {
 273                 .ctx = &ctx->serpent_ctx,
 274                 .fpu_enabled = false,
 275         };
 276         struct lrw_crypt_req req = {
 277                 .tbuf = buf,
 278                 .tbuflen = sizeof(buf),
 279
 280                 .table_ctx = &ctx->lrw_table,
 281                 .crypt_ctx = &crypt_ctx,
 282                 .crypt_fn = decrypt_callback,
 283         };
 284         int ret;
 285
 286         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 287         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 288         serpent_fpu_end(crypt_ctx.fpu_enabled);
 289
 290         return ret;
 291 }
 292
 293 static void lrw_exit_tfm(struct crypto_tfm *tfm)
 294 {
 295         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 296
 297         lrw_free_table(&ctx->lrw_table);
 298 }
 299
 300 struct serpent_xts_ctx {
 301         struct serpent_ctx tweak_ctx;
 302         struct serpent_ctx crypt_ctx;
 303 };
 304
 305 static int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 306                               unsigned int keylen)
 307 {
 308         struct serpent_xts_ctx *ctx = crypto_tfm_ctx(tfm);
 309         u32 *flags = &tfm->crt_flags;
 310         int err;
 311
 312         /* key consists of keys of equal size concatenated, therefore
 313          * the length must be even
 314          */
 315         if (keylen % 2) {
 316                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 317                 return -EINVAL;
 318         }
 319
 320         /* first half of xts-key is for crypt */
 321         err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
 322         if (err)
 323                 return err;
 324
 325         /* second half of xts-key is for tweak */
 326         return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
 327 }
 328
 329 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 330                        struct scatterlist *src, unsigned int nbytes)
 331 {
 332         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 333         be128 buf[SERPENT_PARALLEL_BLOCKS];
 334         struct crypt_priv crypt_ctx = {
 335                 .ctx = &ctx->crypt_ctx,
 336                 .fpu_enabled = false,
 337         };
 338         struct xts_crypt_req req = {
 339                 .tbuf = buf,
 340                 .tbuflen = sizeof(buf),
 341
 342                 .tweak_ctx = &ctx->tweak_ctx,
 343                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 344                 .crypt_ctx = &crypt_ctx,
 345                 .crypt_fn = encrypt_callback,
 346         };
 347         int ret;
 348
 349         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 350         ret = xts_crypt(desc, dst, src, nbytes, &req);
 351         serpent_fpu_end(crypt_ctx.fpu_enabled);
 352
 353         return ret;
 354 }
 355
 356 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 357                        struct scatterlist *src, unsigned int nbytes)
 358 {
 359         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 360         be128 buf[SERPENT_PARALLEL_BLOCKS];
 361         struct crypt_priv crypt_ctx = {
 362                 .ctx = &ctx->crypt_ctx,
 363                 .fpu_enabled = false,
 364         };
 365         struct xts_crypt_req req = {
 366                 .tbuf = buf,
 367                 .tbuflen = sizeof(buf),
 368
 369                 .tweak_ctx = &ctx->tweak_ctx,
 370                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 371                 .crypt_ctx = &crypt_ctx,
 372                 .crypt_fn = decrypt_callback,
 373         };
 374         int ret;
 375
 376         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 377         ret = xts_crypt(desc, dst, src, nbytes, &req);
 378         serpent_fpu_end(crypt_ctx.fpu_enabled);
 379
 380         return ret;
 381 }
 382
 383 static struct crypto_alg serpent_algs[10] = { {
 384         .cra_name               = "__ecb-serpent-avx",
 385         .cra_driver_name        = "__driver-ecb-serpent-avx",
 386         .cra_priority           = 0,
 387         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 388         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 389         .cra_ctxsize            = sizeof(struct serpent_ctx),
 390         .cra_alignmask          = 0,
 391         .cra_type               = &crypto_blkcipher_type,
 392         .cra_module             = THIS_MODULE,
 393         .cra_u = {
 394                 .blkcipher = {
 395                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 396                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 397                         .setkey         = serpent_setkey,
 398                         .encrypt        = ecb_encrypt,
 399                         .decrypt        = ecb_decrypt,
 400                 },
 401         },
 402 }, {
 403         .cra_name               = "__cbc-serpent-avx",
 404         .cra_driver_name        = "__driver-cbc-serpent-avx",
 405         .cra_priority           = 0,
 406         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 407         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 408         .cra_ctxsize            = sizeof(struct serpent_ctx),
 409         .cra_alignmask          = 0,
 410         .cra_type               = &crypto_blkcipher_type,
 411         .cra_module             = THIS_MODULE,
 412         .cra_u = {
 413                 .blkcipher = {
 414                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 415                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 416                         .setkey         = serpent_setkey,
 417                         .encrypt        = cbc_encrypt,
 418                         .decrypt        = cbc_decrypt,
 419                 },
 420         },
 421 }, {
 422         .cra_name               = "__ctr-serpent-avx",
 423         .cra_driver_name        = "__driver-ctr-serpent-avx",
 424         .cra_priority           = 0,
 425         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 426         .cra_blocksize          = 1,
 427         .cra_ctxsize            = sizeof(struct serpent_ctx),
 428         .cra_alignmask          = 0,
 429         .cra_type               = &crypto_blkcipher_type,
 430         .cra_module             = THIS_MODULE,
 431         .cra_u = {
 432                 .blkcipher = {
 433                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 434                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 435                         .ivsize         = SERPENT_BLOCK_SIZE,
 436                         .setkey         = serpent_setkey,
 437                         .encrypt        = ctr_crypt,
 438                         .decrypt        = ctr_crypt,
 439                 },
 440         },
 441 }, {
 442         .cra_name               = "__lrw-serpent-avx",
 443         .cra_driver_name        = "__driver-lrw-serpent-avx",
 444         .cra_priority           = 0,
 445         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 446         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 447         .cra_ctxsize            = sizeof(struct serpent_lrw_ctx),
 448         .cra_alignmask          = 0,
 449         .cra_type               = &crypto_blkcipher_type,
 450         .cra_module             = THIS_MODULE,
 451         .cra_exit               = lrw_exit_tfm,
 452         .cra_u = {
 453                 .blkcipher = {
 454                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 455                                           SERPENT_BLOCK_SIZE,
 456                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 457                                           SERPENT_BLOCK_SIZE,
 458                         .ivsize         = SERPENT_BLOCK_SIZE,
 459                         .setkey         = lrw_serpent_setkey,
 460                         .encrypt        = lrw_encrypt,
 461                         .decrypt        = lrw_decrypt,
 462                 },
 463         },
 464 }, {
 465         .cra_name               = "__xts-serpent-avx",
 466         .cra_driver_name        = "__driver-xts-serpent-avx",
 467         .cra_priority           = 0,
 468         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 469         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 470         .cra_ctxsize            = sizeof(struct serpent_xts_ctx),
 471         .cra_alignmask          = 0,
 472         .cra_type               = &crypto_blkcipher_type,
 473         .cra_module             = THIS_MODULE,
 474         .cra_u = {
 475                 .blkcipher = {
 476                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 477                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 478                         .ivsize         = SERPENT_BLOCK_SIZE,
 479                         .setkey         = xts_serpent_setkey,
 480                         .encrypt        = xts_encrypt,
 481                         .decrypt        = xts_decrypt,
 482                 },
 483         },
 484 }, {
 485         .cra_name               = "ecb(serpent)",
 486         .cra_driver_name        = "ecb-serpent-avx",
 487         .cra_priority           = 500,
 488         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 489         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 490         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 491         .cra_alignmask          = 0,
 492         .cra_type               = &crypto_ablkcipher_type,
 493         .cra_module             = THIS_MODULE,
 494         .cra_init               = ablk_init,
 495         .cra_exit               = ablk_exit,
 496         .cra_u = {
 497                 .ablkcipher = {
 498                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 499                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 500                         .setkey         = ablk_set_key,
 501                         .encrypt        = ablk_encrypt,
 502                         .decrypt        = ablk_decrypt,
 503                 },
 504         },
 505 }, {
 506         .cra_name               = "cbc(serpent)",
 507         .cra_driver_name        = "cbc-serpent-avx",
 508         .cra_priority           = 500,
 509         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 510         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 511         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 512         .cra_alignmask          = 0,
 513         .cra_type               = &crypto_ablkcipher_type,
 514         .cra_module             = THIS_MODULE,
 515         .cra_init               = ablk_init,
 516         .cra_exit               = ablk_exit,
 517         .cra_u = {
 518                 .ablkcipher = {
 519                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 520                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 521                         .ivsize         = SERPENT_BLOCK_SIZE,
 522                         .setkey         = ablk_set_key,
 523                         .encrypt        = __ablk_encrypt,
 524                         .decrypt        = ablk_decrypt,
 525                 },
 526         },
 527 }, {
 528         .cra_name               = "ctr(serpent)",
 529         .cra_driver_name        = "ctr-serpent-avx",
 530         .cra_priority           = 500,
 531         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 532         .cra_blocksize          = 1,
 533         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 534         .cra_alignmask          = 0,
 535         .cra_type               = &crypto_ablkcipher_type,
 536         .cra_module             = THIS_MODULE,
 537         .cra_init               = ablk_init,
 538         .cra_exit               = ablk_exit,
 539         .cra_u = {
 540                 .ablkcipher = {
 541                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 542                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 543                         .ivsize         = SERPENT_BLOCK_SIZE,
 544                         .setkey         = ablk_set_key,
 545                         .encrypt        = ablk_encrypt,
 546                         .decrypt        = ablk_encrypt,
 547                         .geniv          = "chainiv",
 548                 },
 549         },
 550 }, {
 551         .cra_name               = "lrw(serpent)",
 552         .cra_driver_name        = "lrw-serpent-avx",
 553         .cra_priority           = 500,
 554         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 555         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 556         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 557         .cra_alignmask          = 0,
 558         .cra_type               = &crypto_ablkcipher_type,
 559         .cra_module             = THIS_MODULE,
 560         .cra_init               = ablk_init,
 561         .cra_exit               = ablk_exit,
 562         .cra_u = {
 563                 .ablkcipher = {
 564                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 565                                           SERPENT_BLOCK_SIZE,
 566                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 567                                           SERPENT_BLOCK_SIZE,
 568                         .ivsize         = SERPENT_BLOCK_SIZE,
 569                         .setkey         = ablk_set_key,
 570                         .encrypt        = ablk_encrypt,
 571                         .decrypt        = ablk_decrypt,
 572                 },
 573         },
 574 }, {
 575         .cra_name               = "xts(serpent)",
 576         .cra_driver_name        = "xts-serpent-avx",
 577         .cra_priority           = 500,
 578         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 579         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 580         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 581         .cra_alignmask          = 0,
 582         .cra_type               = &crypto_ablkcipher_type,
 583         .cra_module             = THIS_MODULE,
 584         .cra_init               = ablk_init,
 585         .cra_exit               = ablk_exit,
 586         .cra_u = {
 587                 .ablkcipher = {
 588                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 589                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 590                         .ivsize         = SERPENT_BLOCK_SIZE,
 591                         .setkey         = ablk_set_key,
 592                         .encrypt        = ablk_encrypt,
 593                         .decrypt        = ablk_decrypt,
 594                 },
 595         },
 596 } };
 597
 598 static int __init serpent_init(void)
 599 {
 600         u64 xcr0;
 601
 602         if (!cpu_has_avx || !cpu_has_osxsave) {
 603                 printk(KERN_INFO "AVX instructions are not detected.\n");
 604                 return -ENODEV;
 605         }
 606
 607         xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 608         if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 609                 printk(KERN_INFO "AVX detected but unusable.\n");
 610                 return -ENODEV;
 611         }
 612
 613         return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 614 }
 615
 616 static void __exit serpent_exit(void)
 617 {
 618         crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 619 }
 620
 621 module_init(serpent_init);
 622 module_exit(serpent_exit);
 623
 624 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
 625 MODULE_LICENSE("GPL");
 626 MODULE_ALIAS("serpent");