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

   1 /*
   2  * sha512-neon-glue.c - accelerated SHA-384/512 for ARM NEON
   3  *
   4  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/sha.h>
  13 #include <crypto/sha512_base.h>
  14 #include <linux/crypto.h>
  15 #include <linux/module.h>
  16
  17 #include <asm/simd.h>
  18 #include <asm/neon.h>
  19
  20 #include "sha512.h"
  21
  22 MODULE_ALIAS_CRYPTO("sha384-neon");
  23 MODULE_ALIAS_CRYPTO("sha512-neon");
  24
  25 asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
  26                                              int blocks);
  27
  28 static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
  29                               unsigned int len)
  30 {
  31         struct sha512_state *sctx = shash_desc_ctx(desc);
  32
  33         if (!may_use_simd() ||
  34             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  35                 return sha512_arm_update(desc, data, len);
  36
  37         kernel_neon_begin();
  38         sha512_base_do_update(desc, data, len,
  39                 (sha512_block_fn *)sha512_block_data_order_neon);
  40         kernel_neon_end();
  41
  42         return 0;
  43 }
  44
  45 static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
  46                              unsigned int len, u8 *out)
  47 {
  48         if (!may_use_simd())
  49                 return sha512_arm_finup(desc, data, len, out);
  50
  51         kernel_neon_begin();
  52         if (len)
  53                 sha512_base_do_update(desc, data, len,
  54                         (sha512_block_fn *)sha512_block_data_order_neon);
  55         sha512_base_do_finalize(desc,
  56                 (sha512_block_fn *)sha512_block_data_order_neon);
  57         kernel_neon_end();
  58
  59         return sha512_base_finish(desc, out);
  60 }
  61
  62 static int sha512_neon_final(struct shash_desc *desc, u8 *out)
  63 {
  64         return sha512_neon_finup(desc, NULL, 0, out);
  65 }
  66
  67 struct shash_alg sha512_neon_algs[] = { {
  68         .init                   = sha384_base_init,
  69         .update                 = sha512_neon_update,
  70         .final                  = sha512_neon_final,
  71         .finup                  = sha512_neon_finup,
  72         .descsize               = sizeof(struct sha512_state),
  73         .digestsize             = SHA384_DIGEST_SIZE,
  74         .base                   = {
  75                 .cra_name               = "sha384",
  76                 .cra_driver_name        = "sha384-neon",
  77                 .cra_priority           = 300,
  78                 .cra_blocksize          = SHA384_BLOCK_SIZE,
  79                 .cra_module             = THIS_MODULE,
  80
  81         }
  82 },  {
  83         .init                   = sha512_base_init,
  84         .update                 = sha512_neon_update,
  85         .final                  = sha512_neon_final,
  86         .finup                  = sha512_neon_finup,
  87         .descsize               = sizeof(struct sha512_state),
  88         .digestsize             = SHA512_DIGEST_SIZE,
  89         .base                   = {
  90                 .cra_name               = "sha512",
  91                 .cra_driver_name        = "sha512-neon",
  92                 .cra_priority           = 300,
  93                 .cra_blocksize          = SHA512_BLOCK_SIZE,
  94                 .cra_module             = THIS_MODULE,
  95         }
  96 } };