kernel/arch/x86/crypto/sha512_ssse3_glue.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Glue code for the SHA512 Secure Hash Algorithm assembler
   5  * implementation using supplemental SSE3 / AVX / AVX2 instructions.
   6  *
   7  * This file is based on sha512_generic.c
   8  *
   9  * Copyright (C) 2013 Intel Corporation
  10  * Author: Tim Chen <tim.c.chen@linux.intel.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  21  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  22  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  *
  26  */
  27
  28 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  29
  30 #include <crypto/internal/hash.h>
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/mm.h>
  34 #include <linux/cryptohash.h>
  35 #include <linux/types.h>
  36 #include <crypto/sha.h>
  37 #include <crypto/sha512_base.h>
  38 #include <asm/fpu/api.h>
  39
  40 #include <linux/string.h>
  41
  42 asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
  43                                        u64 rounds);
  44
  45 typedef void (sha512_transform_fn)(u64 *digest, const char *data, u64 rounds);
  46
  47 static int sha512_update(struct shash_desc *desc, const u8 *data,
  48                        unsigned int len, sha512_transform_fn *sha512_xform)
  49 {
  50         struct sha512_state *sctx = shash_desc_ctx(desc);
  51
  52         if (!irq_fpu_usable() ||
  53             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  54                 return crypto_sha512_update(desc, data, len);
  55
  56         /* make sure casting to sha512_block_fn() is safe */
  57         BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
  58
  59         kernel_fpu_begin();
  60         sha512_base_do_update(desc, data, len,
  61                               (sha512_block_fn *)sha512_xform);
  62         kernel_fpu_end();
  63
  64         return 0;
  65 }
  66
  67 static int sha512_finup(struct shash_desc *desc, const u8 *data,
  68               unsigned int len, u8 *out, sha512_transform_fn *sha512_xform)
  69 {
  70         if (!irq_fpu_usable())
  71                 return crypto_sha512_finup(desc, data, len, out);
  72
  73         kernel_fpu_begin();
  74         if (len)
  75                 sha512_base_do_update(desc, data, len,
  76                                       (sha512_block_fn *)sha512_xform);
  77         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_xform);
  78         kernel_fpu_end();
  79
  80         return sha512_base_finish(desc, out);
  81 }
  82
  83 static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
  84                        unsigned int len)
  85 {
  86         return sha512_update(desc, data, len, sha512_transform_ssse3);
  87 }
  88
  89 static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
  90               unsigned int len, u8 *out)
  91 {
  92         return sha512_finup(desc, data, len, out, sha512_transform_ssse3);
  93 }
  94
  95 /* Add padding and return the message digest. */
  96 static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
  97 {
  98         return sha512_ssse3_finup(desc, NULL, 0, out);
  99 }
 100
 101 static struct shash_alg sha512_ssse3_algs[] = { {
 102         .digestsize     =       SHA512_DIGEST_SIZE,
 103         .init           =       sha512_base_init,
 104         .update         =       sha512_ssse3_update,
 105         .final          =       sha512_ssse3_final,
 106         .finup          =       sha512_ssse3_finup,
 107         .descsize       =       sizeof(struct sha512_state),
 108         .base           =       {
 109                 .cra_name       =       "sha512",
 110                 .cra_driver_name =      "sha512-ssse3",
 111                 .cra_priority   =       150,
 112                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 113                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 114                 .cra_module     =       THIS_MODULE,
 115         }
 116 },  {
 117         .digestsize     =       SHA384_DIGEST_SIZE,
 118         .init           =       sha384_base_init,
 119         .update         =       sha512_ssse3_update,
 120         .final          =       sha512_ssse3_final,
 121         .finup          =       sha512_ssse3_finup,
 122         .descsize       =       sizeof(struct sha512_state),
 123         .base           =       {
 124                 .cra_name       =       "sha384",
 125                 .cra_driver_name =      "sha384-ssse3",
 126                 .cra_priority   =       150,
 127                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 128                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 129                 .cra_module     =       THIS_MODULE,
 130         }
 131 } };
 132
 133 static int register_sha512_ssse3(void)
 134 {
 135         if (boot_cpu_has(X86_FEATURE_SSSE3))
 136                 return crypto_register_shashes(sha512_ssse3_algs,
 137                         ARRAY_SIZE(sha512_ssse3_algs));
 138         return 0;
 139 }
 140
 141 static void unregister_sha512_ssse3(void)
 142 {
 143         if (boot_cpu_has(X86_FEATURE_SSSE3))
 144                 crypto_unregister_shashes(sha512_ssse3_algs,
 145                         ARRAY_SIZE(sha512_ssse3_algs));
 146 }
 147
 148 #ifdef CONFIG_AS_AVX
 149 asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
 150                                      u64 rounds);
 151 static bool avx_usable(void)
 152 {
 153         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
 154                 if (cpu_has_avx)
 155                         pr_info("AVX detected but unusable.\n");
 156                 return false;
 157         }
 158
 159         return true;
 160 }
 161
 162 static int sha512_avx_update(struct shash_desc *desc, const u8 *data,
 163                        unsigned int len)
 164 {
 165         return sha512_update(desc, data, len, sha512_transform_avx);
 166 }
 167
 168 static int sha512_avx_finup(struct shash_desc *desc, const u8 *data,
 169               unsigned int len, u8 *out)
 170 {
 171         return sha512_finup(desc, data, len, out, sha512_transform_avx);
 172 }
 173
 174 /* Add padding and return the message digest. */
 175 static int sha512_avx_final(struct shash_desc *desc, u8 *out)
 176 {
 177         return sha512_avx_finup(desc, NULL, 0, out);
 178 }
 179
 180 static struct shash_alg sha512_avx_algs[] = { {
 181         .digestsize     =       SHA512_DIGEST_SIZE,
 182         .init           =       sha512_base_init,
 183         .update         =       sha512_avx_update,
 184         .final          =       sha512_avx_final,
 185         .finup          =       sha512_avx_finup,
 186         .descsize       =       sizeof(struct sha512_state),
 187         .base           =       {
 188                 .cra_name       =       "sha512",
 189                 .cra_driver_name =      "sha512-avx",
 190                 .cra_priority   =       160,
 191                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 192                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 193                 .cra_module     =       THIS_MODULE,
 194         }
 195 },  {
 196         .digestsize     =       SHA384_DIGEST_SIZE,
 197         .init           =       sha384_base_init,
 198         .update         =       sha512_avx_update,
 199         .final          =       sha512_avx_final,
 200         .finup          =       sha512_avx_finup,
 201         .descsize       =       sizeof(struct sha512_state),
 202         .base           =       {
 203                 .cra_name       =       "sha384",
 204                 .cra_driver_name =      "sha384-avx",
 205                 .cra_priority   =       160,
 206                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 207                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 208                 .cra_module     =       THIS_MODULE,
 209         }
 210 } };
 211
 212 static int register_sha512_avx(void)
 213 {
 214         if (avx_usable())
 215                 return crypto_register_shashes(sha512_avx_algs,
 216                         ARRAY_SIZE(sha512_avx_algs));
 217         return 0;
 218 }
 219
 220 static void unregister_sha512_avx(void)
 221 {
 222         if (avx_usable())
 223                 crypto_unregister_shashes(sha512_avx_algs,
 224                         ARRAY_SIZE(sha512_avx_algs));
 225 }
 226 #else
 227 static inline int register_sha512_avx(void) { return 0; }
 228 static inline void unregister_sha512_avx(void) { }
 229 #endif
 230
 231 #if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
 232 asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
 233                                       u64 rounds);
 234
 235 static int sha512_avx2_update(struct shash_desc *desc, const u8 *data,
 236                        unsigned int len)
 237 {
 238         return sha512_update(desc, data, len, sha512_transform_rorx);
 239 }
 240
 241 static int sha512_avx2_finup(struct shash_desc *desc, const u8 *data,
 242               unsigned int len, u8 *out)
 243 {
 244         return sha512_finup(desc, data, len, out, sha512_transform_rorx);
 245 }
 246
 247 /* Add padding and return the message digest. */
 248 static int sha512_avx2_final(struct shash_desc *desc, u8 *out)
 249 {
 250         return sha512_avx2_finup(desc, NULL, 0, out);
 251 }
 252
 253 static struct shash_alg sha512_avx2_algs[] = { {
 254         .digestsize     =       SHA512_DIGEST_SIZE,
 255         .init           =       sha512_base_init,
 256         .update         =       sha512_avx2_update,
 257         .final          =       sha512_avx2_final,
 258         .finup          =       sha512_avx2_finup,
 259         .descsize       =       sizeof(struct sha512_state),
 260         .base           =       {
 261                 .cra_name       =       "sha512",
 262                 .cra_driver_name =      "sha512-avx2",
 263                 .cra_priority   =       170,
 264                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 265                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 266                 .cra_module     =       THIS_MODULE,
 267         }
 268 },  {
 269         .digestsize     =       SHA384_DIGEST_SIZE,
 270         .init           =       sha384_base_init,
 271         .update         =       sha512_avx2_update,
 272         .final          =       sha512_avx2_final,
 273         .finup          =       sha512_avx2_finup,
 274         .descsize       =       sizeof(struct sha512_state),
 275         .base           =       {
 276                 .cra_name       =       "sha384",
 277                 .cra_driver_name =      "sha384-avx2",
 278                 .cra_priority   =       170,
 279                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 280                 .cra_blocksize  =       SHA384_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_sha512_avx2(void)
 295 {
 296         if (avx2_usable())
 297                 return crypto_register_shashes(sha512_avx2_algs,
 298                         ARRAY_SIZE(sha512_avx2_algs));
 299         return 0;
 300 }
 301
 302 static void unregister_sha512_avx2(void)
 303 {
 304         if (avx2_usable())
 305                 crypto_unregister_shashes(sha512_avx2_algs,
 306                         ARRAY_SIZE(sha512_avx2_algs));
 307 }
 308 #else
 309 static inline int register_sha512_avx2(void) { return 0; }
 310 static inline void unregister_sha512_avx2(void) { }
 311 #endif
 312
 313 static int __init sha512_ssse3_mod_init(void)
 314 {
 315
 316         if (register_sha512_ssse3())
 317                 goto fail;
 318
 319         if (register_sha512_avx()) {
 320                 unregister_sha512_ssse3();
 321                 goto fail;
 322         }
 323
 324         if (register_sha512_avx2()) {
 325                 unregister_sha512_avx();
 326                 unregister_sha512_ssse3();
 327                 goto fail;
 328         }
 329
 330         return 0;
 331 fail:
 332         return -ENODEV;
 333 }
 334
 335 static void __exit sha512_ssse3_mod_fini(void)
 336 {
 337         unregister_sha512_avx2();
 338         unregister_sha512_avx();
 339         unregister_sha512_ssse3();
 340 }
 341
 342 module_init(sha512_ssse3_mod_init);
 343 module_exit(sha512_ssse3_mod_fini);
 344
 345 MODULE_LICENSE("GPL");
 346 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 347
 348 MODULE_ALIAS_CRYPTO("sha512");
 349 MODULE_ALIAS_CRYPTO("sha384");