arch/x86/crypto/serpent_sse2_glue.c

   1 /*
   2  * Glue Code for SSE2 assembler versions of Serpent Cipher
   3  *
   4  * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
   5  *
   6  * Glue code based on aesni-intel_glue.c by:
   7  *  Copyright (C) 2008, Intel Corp.
   8  *    Author: Huang Ying <ying.huang@intel.com>
   9  *
  10  * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
  11  *   Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  12  * CTR part based on code (crypto/ctr.c) by:
  13  *   (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  28  * USA
  29  *
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/hardirq.h>
  34 #include <linux/types.h>
  35 #include <linux/crypto.h>
  36 #include <linux/err.h>
  37 #include <crypto/ablk_helper.h>
  38 #include <crypto/algapi.h>
  39 #include <crypto/serpent.h>
  40 #include <crypto/cryptd.h>
  41 #include <crypto/b128ops.h>
  42 #include <crypto/ctr.h>
  43 #include <crypto/lrw.h>
  44 #include <crypto/xts.h>
  45 #include <asm/crypto/serpent-sse2.h>
  46 #include <asm/crypto/glue_helper.h>
  47
  48 static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
  49 {
  50         u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
  51         unsigned int j;
  52
  53         for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
  54                 ivs[j] = src[j];
  55
  56         serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
  57
  58         for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
  59                 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
  60 }
  61
  62 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  63 {
  64         be128 ctrblk;
  65
  66         le128_to_be128(&ctrblk, iv);
  67         le128_inc(iv);
  68
  69         __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  70         u128_xor(dst, src, (u128 *)&ctrblk);
  71 }
  72
  73 static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
  74                                    le128 *iv)
  75 {
  76         be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
  77         unsigned int i;
  78
  79         for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
  80                 if (dst != src)
  81                         dst[i] = src[i];
  82
  83                 le128_to_be128(&ctrblks[i], iv);
  84                 le128_inc(iv);
  85         }
  86
  87         serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
  88 }
  89
  90 static const struct common_glue_ctx serpent_enc = {
  91         .num_funcs = 2,
  92         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  93
  94         .funcs = { {
  95                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
  96                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
  97         }, {
  98                 .num_blocks = 1,
  99                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
 100         } }
 101 };
 102
 103 static const struct common_glue_ctx serpent_ctr = {
 104         .num_funcs = 2,
 105         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 106
 107         .funcs = { {
 108                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 109                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
 110         }, {
 111                 .num_blocks = 1,
 112                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
 113         } }
 114 };
 115
 116 static const struct common_glue_ctx serpent_dec = {
 117         .num_funcs = 2,
 118         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 119
 120         .funcs = { {
 121                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 122                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
 123         }, {
 124                 .num_blocks = 1,
 125                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
 126         } }
 127 };
 128
 129 static const struct common_glue_ctx serpent_dec_cbc = {
 130         .num_funcs = 2,
 131         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
 132
 133         .funcs = { {
 134                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 135                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
 136         }, {
 137                 .num_blocks = 1,
 138                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
 139         } }
 140 };
 141
 142 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 143                        struct scatterlist *src, unsigned int nbytes)
 144 {
 145         return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
 146 }
 147
 148 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 149                        struct scatterlist *src, unsigned int nbytes)
 150 {
 151         return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
 152 }
 153
 154 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 155                        struct scatterlist *src, unsigned int nbytes)
 156 {
 157         return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
 158                                      dst, src, nbytes);
 159 }
 160
 161 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 162                        struct scatterlist *src, unsigned int nbytes)
 163 {
 164         return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
 165                                        nbytes);
 166 }
 167
 168 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 169                      struct scatterlist *src, unsigned int nbytes)
 170 {
 171         return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 172 }
 173
 174 static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 175 {
 176         return glue_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
 177                               NULL, fpu_enabled, nbytes);
 178 }
 179
 180 static inline void serpent_fpu_end(bool fpu_enabled)
 181 {
 182         glue_fpu_end(fpu_enabled);
 183 }
 184
 185 struct crypt_priv {
 186         struct serpent_ctx *ctx;
 187         bool fpu_enabled;
 188 };
 189
 190 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 191 {
 192         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 193         struct crypt_priv *ctx = priv;
 194         int i;
 195
 196         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 197
 198         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 199                 serpent_enc_blk_xway(ctx->ctx, srcdst, srcdst);
 200                 return;
 201         }
 202
 203         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 204                 __serpent_encrypt(ctx->ctx, srcdst, srcdst);
 205 }
 206
 207 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 208 {
 209         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 210         struct crypt_priv *ctx = priv;
 211         int i;
 212
 213         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 214
 215         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 216                 serpent_dec_blk_xway(ctx->ctx, srcdst, srcdst);
 217                 return;
 218         }
 219
 220         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 221                 __serpent_decrypt(ctx->ctx, srcdst, srcdst);
 222 }
 223
 224 struct serpent_lrw_ctx {
 225         struct lrw_table_ctx lrw_table;
 226         struct serpent_ctx serpent_ctx;
 227 };
 228
 229 static int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 230                               unsigned int keylen)
 231 {
 232         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 233         int err;
 234
 235         err = __serpent_setkey(&ctx->serpent_ctx, key, keylen -
 236                                                         SERPENT_BLOCK_SIZE);
 237         if (err)
 238                 return err;
 239
 240         return lrw_init_table(&ctx->lrw_table, key + keylen -
 241                                                 SERPENT_BLOCK_SIZE);
 242 }
 243
 244 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 245                        struct scatterlist *src, unsigned int nbytes)
 246 {
 247         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 248         be128 buf[SERPENT_PARALLEL_BLOCKS];
 249         struct crypt_priv crypt_ctx = {
 250                 .ctx = &ctx->serpent_ctx,
 251                 .fpu_enabled = false,
 252         };
 253         struct lrw_crypt_req req = {
 254                 .tbuf = buf,
 255                 .tbuflen = sizeof(buf),
 256
 257                 .table_ctx = &ctx->lrw_table,
 258                 .crypt_ctx = &crypt_ctx,
 259                 .crypt_fn = encrypt_callback,
 260         };
 261         int ret;
 262
 263         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 264         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 265         serpent_fpu_end(crypt_ctx.fpu_enabled);
 266
 267         return ret;
 268 }
 269
 270 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 271                        struct scatterlist *src, unsigned int nbytes)
 272 {
 273         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 274         be128 buf[SERPENT_PARALLEL_BLOCKS];
 275         struct crypt_priv crypt_ctx = {
 276                 .ctx = &ctx->serpent_ctx,
 277                 .fpu_enabled = false,
 278         };
 279         struct lrw_crypt_req req = {
 280                 .tbuf = buf,
 281                 .tbuflen = sizeof(buf),
 282
 283                 .table_ctx = &ctx->lrw_table,
 284                 .crypt_ctx = &crypt_ctx,
 285                 .crypt_fn = decrypt_callback,
 286         };
 287         int ret;
 288
 289         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 290         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 291         serpent_fpu_end(crypt_ctx.fpu_enabled);
 292
 293         return ret;
 294 }
 295
 296 static void lrw_exit_tfm(struct crypto_tfm *tfm)
 297 {
 298         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 299
 300         lrw_free_table(&ctx->lrw_table);
 301 }
 302
 303 struct serpent_xts_ctx {
 304         struct serpent_ctx tweak_ctx;
 305         struct serpent_ctx crypt_ctx;
 306 };
 307
 308 static int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 309                               unsigned int keylen)
 310 {
 311         struct serpent_xts_ctx *ctx = crypto_tfm_ctx(tfm);
 312         int err;
 313
 314         err = xts_check_key(tfm, key, keylen);
 315         if (err)
 316                 return err;
 317
 318         /* first half of xts-key is for crypt */
 319         err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
 320         if (err)
 321                 return err;
 322
 323         /* second half of xts-key is for tweak */
 324         return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
 325 }
 326
 327 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 328                        struct scatterlist *src, unsigned int nbytes)
 329 {
 330         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 331         le128 buf[SERPENT_PARALLEL_BLOCKS];
 332         struct crypt_priv crypt_ctx = {
 333                 .ctx = &ctx->crypt_ctx,
 334                 .fpu_enabled = false,
 335         };
 336         struct xts_crypt_req req = {
 337                 .tbuf = buf,
 338                 .tbuflen = sizeof(buf),
 339
 340                 .tweak_ctx = &ctx->tweak_ctx,
 341                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 342                 .crypt_ctx = &crypt_ctx,
 343                 .crypt_fn = encrypt_callback,
 344         };
 345         int ret;
 346
 347         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 348         ret = xts_crypt(desc, dst, src, nbytes, &req);
 349         serpent_fpu_end(crypt_ctx.fpu_enabled);
 350
 351         return ret;
 352 }
 353
 354 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 355                        struct scatterlist *src, unsigned int nbytes)
 356 {
 357         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 358         le128 buf[SERPENT_PARALLEL_BLOCKS];
 359         struct crypt_priv crypt_ctx = {
 360                 .ctx = &ctx->crypt_ctx,
 361                 .fpu_enabled = false,
 362         };
 363         struct xts_crypt_req req = {
 364                 .tbuf = buf,
 365                 .tbuflen = sizeof(buf),
 366
 367                 .tweak_ctx = &ctx->tweak_ctx,
 368                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 369                 .crypt_ctx = &crypt_ctx,
 370                 .crypt_fn = decrypt_callback,
 371         };
 372         int ret;
 373
 374         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 375         ret = xts_crypt(desc, dst, src, nbytes, &req);
 376         serpent_fpu_end(crypt_ctx.fpu_enabled);
 377
 378         return ret;
 379 }
 380
 381 static struct crypto_alg serpent_algs[10] = { {
 382         .cra_name               = "__ecb-serpent-sse2",
 383         .cra_driver_name        = "__driver-ecb-serpent-sse2",
 384         .cra_priority           = 0,
 385         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 386                                   CRYPTO_ALG_INTERNAL,
 387         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 388         .cra_ctxsize            = sizeof(struct serpent_ctx),
 389         .cra_alignmask          = 0,
 390         .cra_type               = &crypto_blkcipher_type,
 391         .cra_module             = THIS_MODULE,
 392         .cra_u = {
 393                 .blkcipher = {
 394                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 395                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 396                         .setkey         = serpent_setkey,
 397                         .encrypt        = ecb_encrypt,
 398                         .decrypt        = ecb_decrypt,
 399                 },
 400         },
 401 }, {
 402         .cra_name               = "__cbc-serpent-sse2",
 403         .cra_driver_name        = "__driver-cbc-serpent-sse2",
 404         .cra_priority           = 0,
 405         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 406                                   CRYPTO_ALG_INTERNAL,
 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-sse2",
 423         .cra_driver_name        = "__driver-ctr-serpent-sse2",
 424         .cra_priority           = 0,
 425         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 426                                   CRYPTO_ALG_INTERNAL,
 427         .cra_blocksize          = 1,
 428         .cra_ctxsize            = sizeof(struct serpent_ctx),
 429         .cra_alignmask          = 0,
 430         .cra_type               = &crypto_blkcipher_type,
 431         .cra_module             = THIS_MODULE,
 432         .cra_u = {
 433                 .blkcipher = {
 434                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 435                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 436                         .ivsize         = SERPENT_BLOCK_SIZE,
 437                         .setkey         = serpent_setkey,
 438                         .encrypt        = ctr_crypt,
 439                         .decrypt        = ctr_crypt,
 440                 },
 441         },
 442 }, {
 443         .cra_name               = "__lrw-serpent-sse2",
 444         .cra_driver_name        = "__driver-lrw-serpent-sse2",
 445         .cra_priority           = 0,
 446         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 447                                   CRYPTO_ALG_INTERNAL,
 448         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 449         .cra_ctxsize            = sizeof(struct serpent_lrw_ctx),
 450         .cra_alignmask          = 0,
 451         .cra_type               = &crypto_blkcipher_type,
 452         .cra_module             = THIS_MODULE,
 453         .cra_exit               = lrw_exit_tfm,
 454         .cra_u = {
 455                 .blkcipher = {
 456                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 457                                           SERPENT_BLOCK_SIZE,
 458                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 459                                           SERPENT_BLOCK_SIZE,
 460                         .ivsize         = SERPENT_BLOCK_SIZE,
 461                         .setkey         = lrw_serpent_setkey,
 462                         .encrypt        = lrw_encrypt,
 463                         .decrypt        = lrw_decrypt,
 464                 },
 465         },
 466 }, {
 467         .cra_name               = "__xts-serpent-sse2",
 468         .cra_driver_name        = "__driver-xts-serpent-sse2",
 469         .cra_priority           = 0,
 470         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER |
 471                                   CRYPTO_ALG_INTERNAL,
 472         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 473         .cra_ctxsize            = sizeof(struct serpent_xts_ctx),
 474         .cra_alignmask          = 0,
 475         .cra_type               = &crypto_blkcipher_type,
 476         .cra_module             = THIS_MODULE,
 477         .cra_u = {
 478                 .blkcipher = {
 479                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 480                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 481                         .ivsize         = SERPENT_BLOCK_SIZE,
 482                         .setkey         = xts_serpent_setkey,
 483                         .encrypt        = xts_encrypt,
 484                         .decrypt        = xts_decrypt,
 485                 },
 486         },
 487 }, {
 488         .cra_name               = "ecb(serpent)",
 489         .cra_driver_name        = "ecb-serpent-sse2",
 490         .cra_priority           = 400,
 491         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 492         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 493         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 494         .cra_alignmask          = 0,
 495         .cra_type               = &crypto_ablkcipher_type,
 496         .cra_module             = THIS_MODULE,
 497         .cra_init               = ablk_init,
 498         .cra_exit               = ablk_exit,
 499         .cra_u = {
 500                 .ablkcipher = {
 501                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 502                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 503                         .setkey         = ablk_set_key,
 504                         .encrypt        = ablk_encrypt,
 505                         .decrypt        = ablk_decrypt,
 506                 },
 507         },
 508 }, {
 509         .cra_name               = "cbc(serpent)",
 510         .cra_driver_name        = "cbc-serpent-sse2",
 511         .cra_priority           = 400,
 512         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 513         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 514         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 515         .cra_alignmask          = 0,
 516         .cra_type               = &crypto_ablkcipher_type,
 517         .cra_module             = THIS_MODULE,
 518         .cra_init               = ablk_init,
 519         .cra_exit               = ablk_exit,
 520         .cra_u = {
 521                 .ablkcipher = {
 522                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 523                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 524                         .ivsize         = SERPENT_BLOCK_SIZE,
 525                         .setkey         = ablk_set_key,
 526                         .encrypt        = __ablk_encrypt,
 527                         .decrypt        = ablk_decrypt,
 528                 },
 529         },
 530 }, {
 531         .cra_name               = "ctr(serpent)",
 532         .cra_driver_name        = "ctr-serpent-sse2",
 533         .cra_priority           = 400,
 534         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 535         .cra_blocksize          = 1,
 536         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 537         .cra_alignmask          = 0,
 538         .cra_type               = &crypto_ablkcipher_type,
 539         .cra_module             = THIS_MODULE,
 540         .cra_init               = ablk_init,
 541         .cra_exit               = ablk_exit,
 542         .cra_u = {
 543                 .ablkcipher = {
 544                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 545                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 546                         .ivsize         = SERPENT_BLOCK_SIZE,
 547                         .setkey         = ablk_set_key,
 548                         .encrypt        = ablk_encrypt,
 549                         .decrypt        = ablk_encrypt,
 550                         .geniv          = "chainiv",
 551                 },
 552         },
 553 }, {
 554         .cra_name               = "lrw(serpent)",
 555         .cra_driver_name        = "lrw-serpent-sse2",
 556         .cra_priority           = 400,
 557         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 558         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 559         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 560         .cra_alignmask          = 0,
 561         .cra_type               = &crypto_ablkcipher_type,
 562         .cra_module             = THIS_MODULE,
 563         .cra_init               = ablk_init,
 564         .cra_exit               = ablk_exit,
 565         .cra_u = {
 566                 .ablkcipher = {
 567                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 568                                           SERPENT_BLOCK_SIZE,
 569                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 570                                           SERPENT_BLOCK_SIZE,
 571                         .ivsize         = SERPENT_BLOCK_SIZE,
 572                         .setkey         = ablk_set_key,
 573                         .encrypt        = ablk_encrypt,
 574                         .decrypt        = ablk_decrypt,
 575                 },
 576         },
 577 }, {
 578         .cra_name               = "xts(serpent)",
 579         .cra_driver_name        = "xts-serpent-sse2",
 580         .cra_priority           = 400,
 581         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 582         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 583         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 584         .cra_alignmask          = 0,
 585         .cra_type               = &crypto_ablkcipher_type,
 586         .cra_module             = THIS_MODULE,
 587         .cra_init               = ablk_init,
 588         .cra_exit               = ablk_exit,
 589         .cra_u = {
 590                 .ablkcipher = {
 591                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 592                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 593                         .ivsize         = SERPENT_BLOCK_SIZE,
 594                         .setkey         = ablk_set_key,
 595                         .encrypt        = ablk_encrypt,
 596                         .decrypt        = ablk_decrypt,
 597                 },
 598         },
 599 } };
 600
 601 static int __init serpent_sse2_init(void)
 602 {
 603         if (!boot_cpu_has(X86_FEATURE_XMM2)) {
 604                 printk(KERN_INFO "SSE2 instructions are not detected.\n");
 605                 return -ENODEV;
 606         }
 607
 608         return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 609 }
 610
 611 static void __exit serpent_sse2_exit(void)
 612 {
 613         crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 614 }
 615
 616 module_init(serpent_sse2_init);
 617 module_exit(serpent_sse2_exit);
 618
 619 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
 620 MODULE_LICENSE("GPL");
 621 MODULE_ALIAS_CRYPTO("serpent");