arch/x86/crypto/sha256_ssse3_glue.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Glue code for the SHA256 Secure Hash Algorithm assembler
   5  * implementation using supplemental SSE3 / AVX / AVX2 instructions.
   6  *
   7  * This file is based on sha256_generic.c
   8  *
   9  * Copyright (C) 2013 Intel Corporation.
  10  *
  11  * Author:
  12  *     Tim Chen <tim.c.chen@linux.intel.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the Free
  16  * Software Foundation; either version 2 of the License, or (at your option)
  17  * any later version.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  23  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  24  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  25  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29
  30 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  31
  32 #include <crypto/internal/hash.h>
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/mm.h>
  36 #include <linux/cryptohash.h>
  37 #include <linux/types.h>
  38 #include <crypto/sha.h>
  39 #include <crypto/sha256_base.h>
  40 #include <asm/fpu/api.h>
  41 #include <linux/string.h>
  42
  43 asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data,
  44                                        u64 rounds);
  45 typedef void (sha256_transform_fn)(u32 *digest, const char *data, u64 rounds);
  46
  47 static int sha256_update(struct shash_desc *desc, const u8 *data,
  48                          unsigned int len, sha256_transform_fn *sha256_xform)
  49 {
  50         struct sha256_state *sctx = shash_desc_ctx(desc);
  51
  52         if (!irq_fpu_usable() ||
  53             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
  54                 return crypto_sha256_update(desc, data, len);
  55
  56         /* make sure casting to sha256_block_fn() is safe */
  57         BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
  58
  59         kernel_fpu_begin();
  60         sha256_base_do_update(desc, data, len,
  61                               (sha256_block_fn *)sha256_xform);
  62         kernel_fpu_end();
  63
  64         return 0;
  65 }
  66
  67 static int sha256_finup(struct shash_desc *desc, const u8 *data,
  68               unsigned int len, u8 *out, sha256_transform_fn *sha256_xform)
  69 {
  70         if (!irq_fpu_usable())
  71                 return crypto_sha256_finup(desc, data, len, out);
  72
  73         kernel_fpu_begin();
  74         if (len)
  75                 sha256_base_do_update(desc, data, len,
  76                                       (sha256_block_fn *)sha256_xform);
  77         sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_xform);
  78         kernel_fpu_end();
  79
  80         return sha256_base_finish(desc, out);
  81 }
  82
  83 static int sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
  84                          unsigned int len)
  85 {
  86         return sha256_update(desc, data, len, sha256_transform_ssse3);
  87 }
  88
  89 static int sha256_ssse3_finup(struct shash_desc *desc, const u8 *data,
  90               unsigned int len, u8 *out)
  91 {
  92         return sha256_finup(desc, data, len, out, sha256_transform_ssse3);
  93 }
  94
  95 /* Add padding and return the message digest. */
  96 static int sha256_ssse3_final(struct shash_desc *desc, u8 *out)
  97 {
  98         return sha256_ssse3_finup(desc, NULL, 0, out);
  99 }
 100
 101 static struct shash_alg sha256_ssse3_algs[] = { {
 102         .digestsize     =       SHA256_DIGEST_SIZE,
 103         .init           =       sha256_base_init,
 104         .update         =       sha256_ssse3_update,
 105         .final          =       sha256_ssse3_final,
 106         .finup          =       sha256_ssse3_finup,
 107         .descsize       =       sizeof(struct sha256_state),
 108         .base           =       {
 109                 .cra_name       =       "sha256",
 110                 .cra_driver_name =      "sha256-ssse3",
 111                 .cra_priority   =       150,
 112                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 113                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 114                 .cra_module     =       THIS_MODULE,
 115         }
 116 }, {
 117         .digestsize     =       SHA224_DIGEST_SIZE,
 118         .init           =       sha224_base_init,
 119         .update         =       sha256_ssse3_update,
 120         .final          =       sha256_ssse3_final,
 121         .finup          =       sha256_ssse3_finup,
 122         .descsize       =       sizeof(struct sha256_state),
 123         .base           =       {
 124                 .cra_name       =       "sha224",
 125                 .cra_driver_name =      "sha224-ssse3",
 126                 .cra_priority   =       150,
 127                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 128                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 129                 .cra_module     =       THIS_MODULE,
 130         }
 131 } };
 132
 133 static int register_sha256_ssse3(void)
 134 {
 135         if (boot_cpu_has(X86_FEATURE_SSSE3))
 136                 return crypto_register_shashes(sha256_ssse3_algs,
 137                                 ARRAY_SIZE(sha256_ssse3_algs));
 138         return 0;
 139 }
 140
 141 static void unregister_sha256_ssse3(void)
 142 {
 143         if (boot_cpu_has(X86_FEATURE_SSSE3))
 144                 crypto_unregister_shashes(sha256_ssse3_algs,
 145                                 ARRAY_SIZE(sha256_ssse3_algs));
 146 }
 147
 148 #ifdef CONFIG_AS_AVX
 149 asmlinkage void sha256_transform_avx(u32 *digest, const char *data,
 150                                      u64 rounds);
 151
 152 static int sha256_avx_update(struct shash_desc *desc, const u8 *data,
 153                          unsigned int len)
 154 {
 155         return sha256_update(desc, data, len, sha256_transform_avx);
 156 }
 157
 158 static int sha256_avx_finup(struct shash_desc *desc, const u8 *data,
 159                       unsigned int len, u8 *out)
 160 {
 161         return sha256_finup(desc, data, len, out, sha256_transform_avx);
 162 }
 163
 164 static int sha256_avx_final(struct shash_desc *desc, u8 *out)
 165 {
 166         return sha256_avx_finup(desc, NULL, 0, out);
 167 }
 168
 169 static struct shash_alg sha256_avx_algs[] = { {
 170         .digestsize     =       SHA256_DIGEST_SIZE,
 171         .init           =       sha256_base_init,
 172         .update         =       sha256_avx_update,
 173         .final          =       sha256_avx_final,
 174         .finup          =       sha256_avx_finup,
 175         .descsize       =       sizeof(struct sha256_state),
 176         .base           =       {
 177                 .cra_name       =       "sha256",
 178                 .cra_driver_name =      "sha256-avx",
 179                 .cra_priority   =       160,
 180                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 181                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 182                 .cra_module     =       THIS_MODULE,
 183         }
 184 }, {
 185         .digestsize     =       SHA224_DIGEST_SIZE,
 186         .init           =       sha224_base_init,
 187         .update         =       sha256_avx_update,
 188         .final          =       sha256_avx_final,
 189         .finup          =       sha256_avx_finup,
 190         .descsize       =       sizeof(struct sha256_state),
 191         .base           =       {
 192                 .cra_name       =       "sha224",
 193                 .cra_driver_name =      "sha224-avx",
 194                 .cra_priority   =       160,
 195                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 196                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 197                 .cra_module     =       THIS_MODULE,
 198         }
 199 } };
 200
 201 static bool avx_usable(void)
 202 {
 203         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
 204                 if (cpu_has_avx)
 205                         pr_info("AVX detected but unusable.\n");
 206                 return false;
 207         }
 208
 209         return true;
 210 }
 211
 212 static int register_sha256_avx(void)
 213 {
 214         if (avx_usable())
 215                 return crypto_register_shashes(sha256_avx_algs,
 216                                 ARRAY_SIZE(sha256_avx_algs));
 217         return 0;
 218 }
 219
 220 static void unregister_sha256_avx(void)
 221 {
 222         if (avx_usable())
 223                 crypto_unregister_shashes(sha256_avx_algs,
 224                                 ARRAY_SIZE(sha256_avx_algs));
 225 }
 226
 227 #else
 228 static inline int register_sha256_avx(void) { return 0; }
 229 static inline void unregister_sha256_avx(void) { }
 230 #endif
 231
 232 #if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
 233 asmlinkage void sha256_transform_rorx(u32 *digest, const char *data,
 234                                       u64 rounds);
 235
 236 static int sha256_avx2_update(struct shash_desc *desc, const u8 *data,
 237                          unsigned int len)
 238 {
 239         return sha256_update(desc, data, len, sha256_transform_rorx);
 240 }
 241
 242 static int sha256_avx2_finup(struct shash_desc *desc, const u8 *data,
 243                       unsigned int len, u8 *out)
 244 {
 245         return sha256_finup(desc, data, len, out, sha256_transform_rorx);
 246 }
 247
 248 static int sha256_avx2_final(struct shash_desc *desc, u8 *out)
 249 {
 250         return sha256_avx2_finup(desc, NULL, 0, out);
 251 }
 252
 253 static struct shash_alg sha256_avx2_algs[] = { {
 254         .digestsize     =       SHA256_DIGEST_SIZE,
 255         .init           =       sha256_base_init,
 256         .update         =       sha256_avx2_update,
 257         .final          =       sha256_avx2_final,
 258         .finup          =       sha256_avx2_finup,
 259         .descsize       =       sizeof(struct sha256_state),
 260         .base           =       {
 261                 .cra_name       =       "sha256",
 262                 .cra_driver_name =      "sha256-avx2",
 263                 .cra_priority   =       170,
 264                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 265                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 266                 .cra_module     =       THIS_MODULE,
 267         }
 268 }, {
 269         .digestsize     =       SHA224_DIGEST_SIZE,
 270         .init           =       sha224_base_init,
 271         .update         =       sha256_avx2_update,
 272         .final          =       sha256_avx2_final,
 273         .finup          =       sha256_avx2_finup,
 274         .descsize       =       sizeof(struct sha256_state),
 275         .base           =       {
 276                 .cra_name       =       "sha224",
 277                 .cra_driver_name =      "sha224-avx2",
 278                 .cra_priority   =       170,
 279                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 280                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 281                 .cra_module     =       THIS_MODULE,
 282         }
 283 } };
 284
 285 static bool avx2_usable(void)
 286 {
 287         if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2) &&
 288                     boot_cpu_has(X86_FEATURE_BMI2))
 289                 return true;
 290
 291         return false;
 292 }
 293
 294 static int register_sha256_avx2(void)
 295 {
 296         if (avx2_usable())
 297                 return crypto_register_shashes(sha256_avx2_algs,
 298                                 ARRAY_SIZE(sha256_avx2_algs));
 299         return 0;
 300 }
 301
 302 static void unregister_sha256_avx2(void)
 303 {
 304         if (avx2_usable())
 305                 crypto_unregister_shashes(sha256_avx2_algs,
 306                                 ARRAY_SIZE(sha256_avx2_algs));
 307 }
 308
 309 #else
 310 static inline int register_sha256_avx2(void) { return 0; }
 311 static inline void unregister_sha256_avx2(void) { }
 312 #endif
 313
 314 #ifdef CONFIG_AS_SHA256_NI
 315 asmlinkage void sha256_ni_transform(u32 *digest, const char *data,
 316                                    u64 rounds); /*unsigned int rounds);*/
 317
 318 static int sha256_ni_update(struct shash_desc *desc, const u8 *data,
 319                          unsigned int len)
 320 {
 321         return sha256_update(desc, data, len, sha256_ni_transform);
 322 }
 323
 324 static int sha256_ni_finup(struct shash_desc *desc, const u8 *data,
 325                       unsigned int len, u8 *out)
 326 {
 327         return sha256_finup(desc, data, len, out, sha256_ni_transform);
 328 }
 329
 330 static int sha256_ni_final(struct shash_desc *desc, u8 *out)
 331 {
 332         return sha256_ni_finup(desc, NULL, 0, out);
 333 }
 334
 335 static struct shash_alg sha256_ni_algs[] = { {
 336         .digestsize     =       SHA256_DIGEST_SIZE,
 337         .init           =       sha256_base_init,
 338         .update         =       sha256_ni_update,
 339         .final          =       sha256_ni_final,
 340         .finup          =       sha256_ni_finup,
 341         .descsize       =       sizeof(struct sha256_state),
 342         .base           =       {
 343                 .cra_name       =       "sha256",
 344                 .cra_driver_name =      "sha256-ni",
 345                 .cra_priority   =       250,
 346                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 347                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 348                 .cra_module     =       THIS_MODULE,
 349         }
 350 }, {
 351         .digestsize     =       SHA224_DIGEST_SIZE,
 352         .init           =       sha224_base_init,
 353         .update         =       sha256_ni_update,
 354         .final          =       sha256_ni_final,
 355         .finup          =       sha256_ni_finup,
 356         .descsize       =       sizeof(struct sha256_state),
 357         .base           =       {
 358                 .cra_name       =       "sha224",
 359                 .cra_driver_name =      "sha224-ni",
 360                 .cra_priority   =       250,
 361                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 362                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 363                 .cra_module     =       THIS_MODULE,
 364         }
 365 } };
 366
 367 static int register_sha256_ni(void)
 368 {
 369         if (boot_cpu_has(X86_FEATURE_SHA_NI))
 370                 return crypto_register_shashes(sha256_ni_algs,
 371                                 ARRAY_SIZE(sha256_ni_algs));
 372         return 0;
 373 }
 374
 375 static void unregister_sha256_ni(void)
 376 {
 377         if (boot_cpu_has(X86_FEATURE_SHA_NI))
 378                 crypto_unregister_shashes(sha256_ni_algs,
 379                                 ARRAY_SIZE(sha256_ni_algs));
 380 }
 381
 382 #else
 383 static inline int register_sha256_ni(void) { return 0; }
 384 static inline void unregister_sha256_ni(void) { }
 385 #endif
 386
 387 static int __init sha256_ssse3_mod_init(void)
 388 {
 389         if (register_sha256_ssse3())
 390                 goto fail;
 391
 392         if (register_sha256_avx()) {
 393                 unregister_sha256_ssse3();
 394                 goto fail;
 395         }
 396
 397         if (register_sha256_avx2()) {
 398                 unregister_sha256_avx();
 399                 unregister_sha256_ssse3();
 400                 goto fail;
 401         }
 402
 403         if (register_sha256_ni()) {
 404                 unregister_sha256_avx2();
 405                 unregister_sha256_avx();
 406                 unregister_sha256_ssse3();
 407                 goto fail;
 408         }
 409
 410         return 0;
 411 fail:
 412         return -ENODEV;
 413 }
 414
 415 static void __exit sha256_ssse3_mod_fini(void)
 416 {
 417         unregister_sha256_ni();
 418         unregister_sha256_avx2();
 419         unregister_sha256_avx();
 420         unregister_sha256_ssse3();
 421 }
 422
 423 module_init(sha256_ssse3_mod_init);
 424 module_exit(sha256_ssse3_mod_fini);
 425
 426 MODULE_LICENSE("GPL");
 427 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 428
 429 MODULE_ALIAS_CRYPTO("sha256");
 430 MODULE_ALIAS_CRYPTO("sha224");