arch/x86/crypto/sha1_ssse3_glue.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
   5  * Supplemental SSE3 instructions.
   6  *
   7  * This file is based on sha1_generic.c
   8  *
   9  * Copyright (c) Alan Smithee.
  10  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  11  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  12  * Copyright (c) Mathias Krause <minipli@googlemail.com>
  13  * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the Free
  17  * Software Foundation; either version 2 of the License, or (at your option)
  18  * any later version.
  19  *
  20  */
  21
  22 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  23
  24 #include <crypto/internal/hash.h>
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/mm.h>
  28 #include <linux/cryptohash.h>
  29 #include <linux/types.h>
  30 #include <crypto/sha.h>
  31 #include <crypto/sha1_base.h>
  32 #include <asm/fpu/api.h>
  33
  34 typedef void (sha1_transform_fn)(u32 *digest, const char *data,
  35                                 unsigned int rounds);
  36
  37 static int sha1_update(struct shash_desc *desc, const u8 *data,
  38                              unsigned int len, sha1_transform_fn *sha1_xform)
  39 {
  40         struct sha1_state *sctx = shash_desc_ctx(desc);
  41
  42         if (!irq_fpu_usable() ||
  43             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  44                 return crypto_sha1_update(desc, data, len);
  45
  46         /* make sure casting to sha1_block_fn() is safe */
  47         BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);
  48
  49         kernel_fpu_begin();
  50         sha1_base_do_update(desc, data, len,
  51                             (sha1_block_fn *)sha1_xform);
  52         kernel_fpu_end();
  53
  54         return 0;
  55 }
  56
  57 static int sha1_finup(struct shash_desc *desc, const u8 *data,
  58                       unsigned int len, u8 *out, sha1_transform_fn *sha1_xform)
  59 {
  60         if (!irq_fpu_usable())
  61                 return crypto_sha1_finup(desc, data, len, out);
  62
  63         kernel_fpu_begin();
  64         if (len)
  65                 sha1_base_do_update(desc, data, len,
  66                                     (sha1_block_fn *)sha1_xform);
  67         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_xform);
  68         kernel_fpu_end();
  69
  70         return sha1_base_finish(desc, out);
  71 }
  72
  73 asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data,
  74                                      unsigned int rounds);
  75
  76 static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data,
  77                              unsigned int len)
  78 {
  79         return sha1_update(desc, data, len,
  80                         (sha1_transform_fn *) sha1_transform_ssse3);
  81 }
  82
  83 static int sha1_ssse3_finup(struct shash_desc *desc, const u8 *data,
  84                               unsigned int len, u8 *out)
  85 {
  86         return sha1_finup(desc, data, len, out,
  87                         (sha1_transform_fn *) sha1_transform_ssse3);
  88 }
  89
  90 /* Add padding and return the message digest. */
  91 static int sha1_ssse3_final(struct shash_desc *desc, u8 *out)
  92 {
  93         return sha1_ssse3_finup(desc, NULL, 0, out);
  94 }
  95
  96 static struct shash_alg sha1_ssse3_alg = {
  97         .digestsize     =       SHA1_DIGEST_SIZE,
  98         .init           =       sha1_base_init,
  99         .update         =       sha1_ssse3_update,
 100         .final          =       sha1_ssse3_final,
 101         .finup          =       sha1_ssse3_finup,
 102         .descsize       =       sizeof(struct sha1_state),
 103         .base           =       {
 104                 .cra_name       =       "sha1",
 105                 .cra_driver_name =      "sha1-ssse3",
 106                 .cra_priority   =       150,
 107                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 108                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 109                 .cra_module     =       THIS_MODULE,
 110         }
 111 };
 112
 113 static int register_sha1_ssse3(void)
 114 {
 115         if (boot_cpu_has(X86_FEATURE_SSSE3))
 116                 return crypto_register_shash(&sha1_ssse3_alg);
 117         return 0;
 118 }
 119
 120 static void unregister_sha1_ssse3(void)
 121 {
 122         if (boot_cpu_has(X86_FEATURE_SSSE3))
 123                 crypto_unregister_shash(&sha1_ssse3_alg);
 124 }
 125
 126 #ifdef CONFIG_AS_AVX
 127 asmlinkage void sha1_transform_avx(u32 *digest, const char *data,
 128                                    unsigned int rounds);
 129
 130 static int sha1_avx_update(struct shash_desc *desc, const u8 *data,
 131                              unsigned int len)
 132 {
 133         return sha1_update(desc, data, len,
 134                         (sha1_transform_fn *) sha1_transform_avx);
 135 }
 136
 137 static int sha1_avx_finup(struct shash_desc *desc, const u8 *data,
 138                               unsigned int len, u8 *out)
 139 {
 140         return sha1_finup(desc, data, len, out,
 141                         (sha1_transform_fn *) sha1_transform_avx);
 142 }
 143
 144 static int sha1_avx_final(struct shash_desc *desc, u8 *out)
 145 {
 146         return sha1_avx_finup(desc, NULL, 0, out);
 147 }
 148
 149 static struct shash_alg sha1_avx_alg = {
 150         .digestsize     =       SHA1_DIGEST_SIZE,
 151         .init           =       sha1_base_init,
 152         .update         =       sha1_avx_update,
 153         .final          =       sha1_avx_final,
 154         .finup          =       sha1_avx_finup,
 155         .descsize       =       sizeof(struct sha1_state),
 156         .base           =       {
 157                 .cra_name       =       "sha1",
 158                 .cra_driver_name =      "sha1-avx",
 159                 .cra_priority   =       160,
 160                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 161                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 162                 .cra_module     =       THIS_MODULE,
 163         }
 164 };
 165
 166 static bool avx_usable(void)
 167 {
 168         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
 169                 if (cpu_has_avx)
 170                         pr_info("AVX detected but unusable.\n");
 171                 return false;
 172         }
 173
 174         return true;
 175 }
 176
 177 static int register_sha1_avx(void)
 178 {
 179         if (avx_usable())
 180                 return crypto_register_shash(&sha1_avx_alg);
 181         return 0;
 182 }
 183
 184 static void unregister_sha1_avx(void)
 185 {
 186         if (avx_usable())
 187                 crypto_unregister_shash(&sha1_avx_alg);
 188 }
 189
 190 #else  /* CONFIG_AS_AVX */
 191 static inline int register_sha1_avx(void) { return 0; }
 192 static inline void unregister_sha1_avx(void) { }
 193 #endif /* CONFIG_AS_AVX */
 194
 195
 196 #if defined(CONFIG_AS_AVX2) && (CONFIG_AS_AVX)
 197 #define SHA1_AVX2_BLOCK_OPTSIZE 4       /* optimal 4*64 bytes of SHA1 blocks */
 198
 199 asmlinkage void sha1_transform_avx2(u32 *digest, const char *data,
 200                                     unsigned int rounds);
 201
 202 static bool avx2_usable(void)
 203 {
 204         if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2)
 205                 && boot_cpu_has(X86_FEATURE_BMI1)
 206                 && boot_cpu_has(X86_FEATURE_BMI2))
 207                 return true;
 208
 209         return false;
 210 }
 211
 212 static void sha1_apply_transform_avx2(u32 *digest, const char *data,
 213                                 unsigned int rounds)
 214 {
 215         /* Select the optimal transform based on data block size */
 216         if (rounds >= SHA1_AVX2_BLOCK_OPTSIZE)
 217                 sha1_transform_avx2(digest, data, rounds);
 218         else
 219                 sha1_transform_avx(digest, data, rounds);
 220 }
 221
 222 static int sha1_avx2_update(struct shash_desc *desc, const u8 *data,
 223                              unsigned int len)
 224 {
 225         return sha1_update(desc, data, len,
 226                 (sha1_transform_fn *) sha1_apply_transform_avx2);
 227 }
 228
 229 static int sha1_avx2_finup(struct shash_desc *desc, const u8 *data,
 230                               unsigned int len, u8 *out)
 231 {
 232         return sha1_finup(desc, data, len, out,
 233                 (sha1_transform_fn *) sha1_apply_transform_avx2);
 234 }
 235
 236 static int sha1_avx2_final(struct shash_desc *desc, u8 *out)
 237 {
 238         return sha1_avx2_finup(desc, NULL, 0, out);
 239 }
 240
 241 static struct shash_alg sha1_avx2_alg = {
 242         .digestsize     =       SHA1_DIGEST_SIZE,
 243         .init           =       sha1_base_init,
 244         .update         =       sha1_avx2_update,
 245         .final          =       sha1_avx2_final,
 246         .finup          =       sha1_avx2_finup,
 247         .descsize       =       sizeof(struct sha1_state),
 248         .base           =       {
 249                 .cra_name       =       "sha1",
 250                 .cra_driver_name =      "sha1-avx2",
 251                 .cra_priority   =       170,
 252                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 253                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 254                 .cra_module     =       THIS_MODULE,
 255         }
 256 };
 257
 258 static int register_sha1_avx2(void)
 259 {
 260         if (avx2_usable())
 261                 return crypto_register_shash(&sha1_avx2_alg);
 262         return 0;
 263 }
 264
 265 static void unregister_sha1_avx2(void)
 266 {
 267         if (avx2_usable())
 268                 crypto_unregister_shash(&sha1_avx2_alg);
 269 }
 270
 271 #else
 272 static inline int register_sha1_avx2(void) { return 0; }
 273 static inline void unregister_sha1_avx2(void) { }
 274 #endif
 275
 276 #ifdef CONFIG_AS_SHA1_NI
 277 asmlinkage void sha1_ni_transform(u32 *digest, const char *data,
 278                                    unsigned int rounds);
 279
 280 static int sha1_ni_update(struct shash_desc *desc, const u8 *data,
 281                              unsigned int len)
 282 {
 283         return sha1_update(desc, data, len,
 284                 (sha1_transform_fn *) sha1_ni_transform);
 285 }
 286
 287 static int sha1_ni_finup(struct shash_desc *desc, const u8 *data,
 288                               unsigned int len, u8 *out)
 289 {
 290         return sha1_finup(desc, data, len, out,
 291                 (sha1_transform_fn *) sha1_ni_transform);
 292 }
 293
 294 static int sha1_ni_final(struct shash_desc *desc, u8 *out)
 295 {
 296         return sha1_ni_finup(desc, NULL, 0, out);
 297 }
 298
 299 static struct shash_alg sha1_ni_alg = {
 300         .digestsize     =       SHA1_DIGEST_SIZE,
 301         .init           =       sha1_base_init,
 302         .update         =       sha1_ni_update,
 303         .final          =       sha1_ni_final,
 304         .finup          =       sha1_ni_finup,
 305         .descsize       =       sizeof(struct sha1_state),
 306         .base           =       {
 307                 .cra_name       =       "sha1",
 308                 .cra_driver_name =      "sha1-ni",
 309                 .cra_priority   =       250,
 310                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 311                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 312                 .cra_module     =       THIS_MODULE,
 313         }
 314 };
 315
 316 static int register_sha1_ni(void)
 317 {
 318         if (boot_cpu_has(X86_FEATURE_SHA_NI))
 319                 return crypto_register_shash(&sha1_ni_alg);
 320         return 0;
 321 }
 322
 323 static void unregister_sha1_ni(void)
 324 {
 325         if (boot_cpu_has(X86_FEATURE_SHA_NI))
 326                 crypto_unregister_shash(&sha1_ni_alg);
 327 }
 328
 329 #else
 330 static inline int register_sha1_ni(void) { return 0; }
 331 static inline void unregister_sha1_ni(void) { }
 332 #endif
 333
 334 static int __init sha1_ssse3_mod_init(void)
 335 {
 336         if (register_sha1_ssse3())
 337                 goto fail;
 338
 339         if (register_sha1_avx()) {
 340                 unregister_sha1_ssse3();
 341                 goto fail;
 342         }
 343
 344         if (register_sha1_avx2()) {
 345                 unregister_sha1_avx();
 346                 unregister_sha1_ssse3();
 347                 goto fail;
 348         }
 349
 350         if (register_sha1_ni()) {
 351                 unregister_sha1_avx2();
 352                 unregister_sha1_avx();
 353                 unregister_sha1_ssse3();
 354                 goto fail;
 355         }
 356
 357         return 0;
 358 fail:
 359         return -ENODEV;
 360 }
 361
 362 static void __exit sha1_ssse3_mod_fini(void)
 363 {
 364         unregister_sha1_ni();
 365         unregister_sha1_avx2();
 366         unregister_sha1_avx();
 367         unregister_sha1_ssse3();
 368 }
 369
 370 module_init(sha1_ssse3_mod_init);
 371 module_exit(sha1_ssse3_mod_fini);
 372
 373 MODULE_LICENSE("GPL");
 374 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 375
 376 MODULE_ALIAS_CRYPTO("sha1");