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(u32 *digest, const void *data,
  25                                              unsigned 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,
  38                         (sha256_block_fn *)sha256_block_data_order_neon);
  39         kernel_neon_end();
  40
  41         return 0;
  42 }
  43
  44 static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data,
  45                                     unsigned int len, u8 *out)
  46 {
  47         if (!crypto_simd_usable())
  48                 return crypto_sha256_arm_finup(desc, data, len, out);
  49
  50         kernel_neon_begin();
  51         if (len)
  52                 sha256_base_do_update(desc, data, len,
  53                         (sha256_block_fn *)sha256_block_data_order_neon);
  54         sha256_base_do_finalize(desc,
  55                         (sha256_block_fn *)sha256_block_data_order_neon);
  56         kernel_neon_end();
  57
  58         return sha256_base_finish(desc, out);
  59 }
  60
  61 static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out)
  62 {
  63         return crypto_sha256_neon_finup(desc, NULL, 0, out);
  64 }
  65
  66 struct shash_alg sha256_neon_algs[] = { {
  67         .digestsize     =       SHA256_DIGEST_SIZE,
  68         .init           =       sha256_base_init,
  69         .update         =       crypto_sha256_neon_update,
  70         .final          =       crypto_sha256_neon_final,
  71         .finup          =       crypto_sha256_neon_finup,
  72         .descsize       =       sizeof(struct sha256_state),
  73         .base           =       {
  74                 .cra_name       =       "sha256",
  75                 .cra_driver_name =      "sha256-neon",
  76                 .cra_priority   =       250,
  77                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  78                 .cra_module     =       THIS_MODULE,
  79         }
  80 }, {
  81         .digestsize     =       SHA224_DIGEST_SIZE,
  82         .init           =       sha224_base_init,
  83         .update         =       crypto_sha256_neon_update,
  84         .final          =       crypto_sha256_neon_final,
  85         .finup          =       crypto_sha256_neon_finup,
  86         .descsize       =       sizeof(struct sha256_state),
  87         .base           =       {
  88                 .cra_name       =       "sha224",
  89                 .cra_driver_name =      "sha224-neon",
  90                 .cra_priority   =       250,
  91                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  92                 .cra_module     =       THIS_MODULE,
  93         }
  94 } };