arch/x86/crypto/nhpoly1305-avx2-glue.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum
   4  * (AVX2 accelerated version)
   5  *
   6  * Copyright 2018 Google LLC
   7  */
   8
   9 #include <crypto/internal/hash.h>
  10 #include <crypto/internal/simd.h>
  11 #include <crypto/nhpoly1305.h>
  12 #include <linux/module.h>
  13 #include <linux/sizes.h>
  14 #include <asm/simd.h>
  15
  16 asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len,
  17                         __le64 hash[NH_NUM_PASSES]);
  18
  19 static int nhpoly1305_avx2_update(struct shash_desc *desc,
  20                                   const u8 *src, unsigned int srclen)
  21 {
  22         if (srclen < 64 || !crypto_simd_usable())
  23                 return crypto_nhpoly1305_update(desc, src, srclen);
  24
  25         do {
  26                 unsigned int n = min_t(unsigned int, srclen, SZ_4K);
  27
  28                 kernel_fpu_begin();
  29                 crypto_nhpoly1305_update_helper(desc, src, n, nh_avx2);
  30                 kernel_fpu_end();
  31                 src += n;
  32                 srclen -= n;
  33         } while (srclen);
  34         return 0;
  35 }
  36
  37 static int nhpoly1305_avx2_digest(struct shash_desc *desc,
  38                                   const u8 *src, unsigned int srclen, u8 *out)
  39 {
  40         return crypto_nhpoly1305_init(desc) ?:
  41                nhpoly1305_avx2_update(desc, src, srclen) ?:
  42                crypto_nhpoly1305_final(desc, out);
  43 }
  44
  45 static struct shash_alg nhpoly1305_alg = {
  46         .base.cra_name          = "nhpoly1305",
  47         .base.cra_driver_name   = "nhpoly1305-avx2",
  48         .base.cra_priority      = 300,
  49         .base.cra_ctxsize       = sizeof(struct nhpoly1305_key),
  50         .base.cra_module        = THIS_MODULE,
  51         .digestsize             = POLY1305_DIGEST_SIZE,
  52         .init                   = crypto_nhpoly1305_init,
  53         .update                 = nhpoly1305_avx2_update,
  54         .final                  = crypto_nhpoly1305_final,
  55         .digest                 = nhpoly1305_avx2_digest,
  56         .setkey                 = crypto_nhpoly1305_setkey,
  57         .descsize               = sizeof(struct nhpoly1305_state),
  58 };
  59
  60 static int __init nhpoly1305_mod_init(void)
  61 {
  62         if (!boot_cpu_has(X86_FEATURE_AVX2) ||
  63             !boot_cpu_has(X86_FEATURE_OSXSAVE))
  64                 return -ENODEV;
  65
  66         return crypto_register_shash(&nhpoly1305_alg);
  67 }
  68
  69 static void __exit nhpoly1305_mod_exit(void)
  70 {
  71         crypto_unregister_shash(&nhpoly1305_alg);
  72 }
  73
  74 module_init(nhpoly1305_mod_init);
  75 module_exit(nhpoly1305_mod_exit);
  76
  77 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (AVX2-accelerated)");
  78 MODULE_LICENSE("GPL v2");
  79 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
  80 MODULE_ALIAS_CRYPTO("nhpoly1305");
  81 MODULE_ALIAS_CRYPTO("nhpoly1305-avx2");