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/i387.h>
  39 #include <asm/xcr.h>
  40 #include <asm/xsave.h>
  41
  42 #include <linux/string.h>
  43
  44 asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
  45                                        u64 rounds);
  46 #ifdef CONFIG_AS_AVX
  47 asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
  48                                      u64 rounds);
  49 #endif
  50 #ifdef CONFIG_AS_AVX2
  51 asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
  52                                       u64 rounds);
  53 #endif
  54
  55 static void (*sha512_transform_asm)(u64 *, const char *, u64);
  56
  57 static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
  58                                unsigned int len)
  59 {
  60         struct sha512_state *sctx = shash_desc_ctx(desc);
  61
  62         if (!irq_fpu_usable() ||
  63             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  64                 return crypto_sha512_update(desc, data, len);
  65
  66         /* make sure casting to sha512_block_fn() is safe */
  67         BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
  68
  69         kernel_fpu_begin();
  70         sha512_base_do_update(desc, data, len,
  71                               (sha512_block_fn *)sha512_transform_asm);
  72         kernel_fpu_end();
  73
  74         return 0;
  75 }
  76
  77 static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
  78                               unsigned int len, u8 *out)
  79 {
  80         if (!irq_fpu_usable())
  81                 return crypto_sha512_finup(desc, data, len, out);
  82
  83         kernel_fpu_begin();
  84         if (len)
  85                 sha512_base_do_update(desc, data, len,
  86                                       (sha512_block_fn *)sha512_transform_asm);
  87         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_transform_asm);
  88         kernel_fpu_end();
  89
  90         return sha512_base_finish(desc, out);
  91 }
  92
  93 /* Add padding and return the message digest. */
  94 static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
  95 {
  96         return sha512_ssse3_finup(desc, NULL, 0, out);
  97 }
  98
  99 static struct shash_alg algs[] = { {
 100         .digestsize     =       SHA512_DIGEST_SIZE,
 101         .init           =       sha512_base_init,
 102         .update         =       sha512_ssse3_update,
 103         .final          =       sha512_ssse3_final,
 104         .finup          =       sha512_ssse3_finup,
 105         .descsize       =       sizeof(struct sha512_state),
 106         .base           =       {
 107                 .cra_name       =       "sha512",
 108                 .cra_driver_name =      "sha512-ssse3",
 109                 .cra_priority   =       150,
 110                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 111                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 112                 .cra_module     =       THIS_MODULE,
 113         }
 114 },  {
 115         .digestsize     =       SHA384_DIGEST_SIZE,
 116         .init           =       sha384_base_init,
 117         .update         =       sha512_ssse3_update,
 118         .final          =       sha512_ssse3_final,
 119         .finup          =       sha512_ssse3_finup,
 120         .descsize       =       sizeof(struct sha512_state),
 121         .base           =       {
 122                 .cra_name       =       "sha384",
 123                 .cra_driver_name =      "sha384-ssse3",
 124                 .cra_priority   =       150,
 125                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 126                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 127                 .cra_module     =       THIS_MODULE,
 128         }
 129 } };
 130
 131 #ifdef CONFIG_AS_AVX
 132 static bool __init avx_usable(void)
 133 {
 134         u64 xcr0;
 135
 136         if (!cpu_has_avx || !cpu_has_osxsave)
 137                 return false;
 138
 139         xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 140         if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 141                 pr_info("AVX detected but unusable.\n");
 142
 143                 return false;
 144         }
 145
 146         return true;
 147 }
 148 #endif
 149
 150 static int __init sha512_ssse3_mod_init(void)
 151 {
 152         /* test for SSSE3 first */
 153         if (cpu_has_ssse3)
 154                 sha512_transform_asm = sha512_transform_ssse3;
 155
 156 #ifdef CONFIG_AS_AVX
 157         /* allow AVX to override SSSE3, it's a little faster */
 158         if (avx_usable()) {
 159 #ifdef CONFIG_AS_AVX2
 160                 if (boot_cpu_has(X86_FEATURE_AVX2))
 161                         sha512_transform_asm = sha512_transform_rorx;
 162                 else
 163 #endif
 164                         sha512_transform_asm = sha512_transform_avx;
 165         }
 166 #endif
 167
 168         if (sha512_transform_asm) {
 169 #ifdef CONFIG_AS_AVX
 170                 if (sha512_transform_asm == sha512_transform_avx)
 171                         pr_info("Using AVX optimized SHA-512 implementation\n");
 172 #ifdef CONFIG_AS_AVX2
 173                 else if (sha512_transform_asm == sha512_transform_rorx)
 174                         pr_info("Using AVX2 optimized SHA-512 implementation\n");
 175 #endif
 176                 else
 177 #endif
 178                         pr_info("Using SSSE3 optimized SHA-512 implementation\n");
 179                 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 180         }
 181         pr_info("Neither AVX nor SSSE3 is available/usable.\n");
 182
 183         return -ENODEV;
 184 }
 185
 186 static void __exit sha512_ssse3_mod_fini(void)
 187 {
 188         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 189 }
 190
 191 module_init(sha512_ssse3_mod_init);
 192 module_exit(sha512_ssse3_mod_fini);
 193
 194 MODULE_LICENSE("GPL");
 195 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
 196
 197 MODULE_ALIAS_CRYPTO("sha512");
 198 MODULE_ALIAS_CRYPTO("sha384");