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