arch/arm/crypto/sha256_neon_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
   4  * using NEON instructions.
   5  *
   6  * Copyright © 2015 Google Inc.
   7  *
   8  * This file is based on sha512_neon_glue.c:
   9  *   Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
  10  */
  11
  12 #include <crypto/internal/hash.h>
  13 #include <crypto/internal/simd.h>
  14 #include <linux/types.h>
  15 #include <linux/string.h>
  16 #include <crypto/sha2.h>
  17 #include <crypto/sha256_base.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/simd.h>
  20 #include <asm/neon.h>
  21
  22 #include "sha256_glue.h"
  23
  24 asmlinkage void sha256_block_data_order_neon(struct sha256_state *digest,
  25                                              const u8 *data, int num_blks);
  26
  27 static int crypto_sha256_neon_update(struct shash_desc *desc, const u8 *data,
  28                                      unsigned int len)
  29 {
  30         struct sha256_state *sctx = shash_desc_ctx(desc);
  31
  32         if (!crypto_simd_usable() ||
  33             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
  34                 return crypto_sha256_arm_update(desc, data, len);
  35
  36         kernel_neon_begin();
  37         sha256_base_do_update(desc, data, len, sha256_block_data_order_neon);
  38         kernel_neon_end();
  39
  40         return 0;
  41 }
  42
  43 static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data,
  44                                     unsigned int len, u8 *out)
  45 {
  46         if (!crypto_simd_usable())
  47                 return crypto_sha256_arm_finup(desc, data, len, out);
  48
  49         kernel_neon_begin();
  50         if (len)
  51                 sha256_base_do_update(desc, data, len,
  52                                       sha256_block_data_order_neon);
  53         sha256_base_do_finalize(desc, sha256_block_data_order_neon);
  54         kernel_neon_end();
  55
  56         return sha256_base_finish(desc, out);
  57 }
  58
  59 static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out)
  60 {
  61         return crypto_sha256_neon_finup(desc, NULL, 0, out);
  62 }
  63
  64 struct shash_alg sha256_neon_algs[] = { {
  65         .digestsize     =       SHA256_DIGEST_SIZE,
  66         .init           =       sha256_base_init,
  67         .update         =       crypto_sha256_neon_update,
  68         .final          =       crypto_sha256_neon_final,
  69         .finup          =       crypto_sha256_neon_finup,
  70         .descsize       =       sizeof(struct sha256_state),
  71         .base           =       {
  72                 .cra_name       =       "sha256",
  73                 .cra_driver_name =      "sha256-neon",
  74                 .cra_priority   =       250,
  75                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  76                 .cra_module     =       THIS_MODULE,
  77         }
  78 }, {
  79         .digestsize     =       SHA224_DIGEST_SIZE,
  80         .init           =       sha224_base_init,
  81         .update         =       crypto_sha256_neon_update,
  82         .final          =       crypto_sha256_neon_final,
  83         .finup          =       crypto_sha256_neon_finup,
  84         .descsize       =       sizeof(struct sha256_state),
  85         .base           =       {
  86                 .cra_name       =       "sha224",
  87                 .cra_driver_name =      "sha224-neon",
  88                 .cra_priority   =       250,
  89                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  90                 .cra_module     =       THIS_MODULE,
  91         }
  92 } };