arch/arm64/crypto/nhpoly1305-neon-glue.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum
   4  * (ARM64 NEON accelerated version)
   5  *
   6  * Copyright 2018 Google LLC
   7  */
   8
   9 #include <asm/neon.h>
  10 #include <asm/simd.h>
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/internal/simd.h>
  13 #include <crypto/nhpoly1305.h>
  14 #include <linux/module.h>
  15
  16 asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len,
  17                         __le64 hash[NH_NUM_PASSES]);
  18
  19 static int nhpoly1305_neon_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_neon_begin();
  29                 crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
  30                 kernel_neon_end();
  31                 src += n;
  32                 srclen -= n;
  33         } while (srclen);
  34         return 0;
  35 }
  36
  37 static struct shash_alg nhpoly1305_alg = {
  38         .base.cra_name          = "nhpoly1305",
  39         .base.cra_driver_name   = "nhpoly1305-neon",
  40         .base.cra_priority      = 200,
  41         .base.cra_ctxsize       = sizeof(struct nhpoly1305_key),
  42         .base.cra_module        = THIS_MODULE,
  43         .digestsize             = POLY1305_DIGEST_SIZE,
  44         .init                   = crypto_nhpoly1305_init,
  45         .update                 = nhpoly1305_neon_update,
  46         .final                  = crypto_nhpoly1305_final,
  47         .setkey                 = crypto_nhpoly1305_setkey,
  48         .descsize               = sizeof(struct nhpoly1305_state),
  49 };
  50
  51 static int __init nhpoly1305_mod_init(void)
  52 {
  53         if (!cpu_have_named_feature(ASIMD))
  54                 return -ENODEV;
  55
  56         return crypto_register_shash(&nhpoly1305_alg);
  57 }
  58
  59 static void __exit nhpoly1305_mod_exit(void)
  60 {
  61         crypto_unregister_shash(&nhpoly1305_alg);
  62 }
  63
  64 module_init(nhpoly1305_mod_init);
  65 module_exit(nhpoly1305_mod_exit);
  66
  67 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)");
  68 MODULE_LICENSE("GPL v2");
  69 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
  70 MODULE_ALIAS_CRYPTO("nhpoly1305");
  71 MODULE_ALIAS_CRYPTO("nhpoly1305-neon");