arch/arm/crypto/sha512-neon-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sha512-neon-glue.c - accelerated SHA-384/512 for ARM NEON
   4  *
   5  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <crypto/internal/hash.h>
   9 #include <crypto/internal/simd.h>
  10 #include <crypto/sha2.h>
  11 #include <crypto/sha512_base.h>
  12 #include <linux/crypto.h>
  13 #include <linux/module.h>
  14
  15 #include <asm/simd.h>
  16 #include <asm/neon.h>
  17
  18 #include "sha512.h"
  19
  20 MODULE_ALIAS_CRYPTO("sha384-neon");
  21 MODULE_ALIAS_CRYPTO("sha512-neon");
  22
  23 asmlinkage void sha512_block_data_order_neon(struct sha512_state *state,
  24                                              const u8 *src, int blocks);
  25
  26 static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
  27                               unsigned int len)
  28 {
  29         struct sha512_state *sctx = shash_desc_ctx(desc);
  30
  31         if (!crypto_simd_usable() ||
  32             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  33                 return sha512_arm_update(desc, data, len);
  34
  35         kernel_neon_begin();
  36         sha512_base_do_update(desc, data, len, sha512_block_data_order_neon);
  37         kernel_neon_end();
  38
  39         return 0;
  40 }
  41
  42 static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
  43                              unsigned int len, u8 *out)
  44 {
  45         if (!crypto_simd_usable())
  46                 return sha512_arm_finup(desc, data, len, out);
  47
  48         kernel_neon_begin();
  49         if (len)
  50                 sha512_base_do_update(desc, data, len,
  51                                       sha512_block_data_order_neon);
  52         sha512_base_do_finalize(desc, sha512_block_data_order_neon);
  53         kernel_neon_end();
  54
  55         return sha512_base_finish(desc, out);
  56 }
  57
  58 static int sha512_neon_final(struct shash_desc *desc, u8 *out)
  59 {
  60         return sha512_neon_finup(desc, NULL, 0, out);
  61 }
  62
  63 struct shash_alg sha512_neon_algs[] = { {
  64         .init                   = sha384_base_init,
  65         .update                 = sha512_neon_update,
  66         .final                  = sha512_neon_final,
  67         .finup                  = sha512_neon_finup,
  68         .descsize               = sizeof(struct sha512_state),
  69         .digestsize             = SHA384_DIGEST_SIZE,
  70         .base                   = {
  71                 .cra_name               = "sha384",
  72                 .cra_driver_name        = "sha384-neon",
  73                 .cra_priority           = 300,
  74                 .cra_blocksize          = SHA384_BLOCK_SIZE,
  75                 .cra_module             = THIS_MODULE,
  76
  77         }
  78 },  {
  79         .init                   = sha512_base_init,
  80         .update                 = sha512_neon_update,
  81         .final                  = sha512_neon_final,
  82         .finup                  = sha512_neon_finup,
  83         .descsize               = sizeof(struct sha512_state),
  84         .digestsize             = SHA512_DIGEST_SIZE,
  85         .base                   = {
  86                 .cra_name               = "sha512",
  87                 .cra_driver_name        = "sha512-neon",
  88                 .cra_priority           = 300,
  89                 .cra_blocksize          = SHA512_BLOCK_SIZE,
  90                 .cra_module             = THIS_MODULE,
  91         }
  92 } };