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/internal/simd.h>
  13 #include <crypto/sha.h>
  14 #include <crypto/sha512_base.h>
  15 #include <linux/crypto.h>
  16 #include <linux/module.h>
  17
  18 #include <asm/simd.h>
  19 #include <asm/neon.h>
  20
  21 #include "sha512.h"
  22
  23 MODULE_ALIAS_CRYPTO("sha384-neon");
  24 MODULE_ALIAS_CRYPTO("sha512-neon");
  25
  26 asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
  27                                              int blocks);
  28
  29 static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
  30                               unsigned int len)
  31 {
  32         struct sha512_state *sctx = shash_desc_ctx(desc);
  33
  34         if (!crypto_simd_usable() ||
  35             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  36                 return sha512_arm_update(desc, data, len);
  37
  38         kernel_neon_begin();
  39         sha512_base_do_update(desc, data, len,
  40                 (sha512_block_fn *)sha512_block_data_order_neon);
  41         kernel_neon_end();
  42
  43         return 0;
  44 }
  45
  46 static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
  47                              unsigned int len, u8 *out)
  48 {
  49         if (!crypto_simd_usable())
  50                 return sha512_arm_finup(desc, data, len, out);
  51
  52         kernel_neon_begin();
  53         if (len)
  54                 sha512_base_do_update(desc, data, len,
  55                         (sha512_block_fn *)sha512_block_data_order_neon);
  56         sha512_base_do_finalize(desc,
  57                 (sha512_block_fn *)sha512_block_data_order_neon);
  58         kernel_neon_end();
  59
  60         return sha512_base_finish(desc, out);
  61 }
  62
  63 static int sha512_neon_final(struct shash_desc *desc, u8 *out)
  64 {
  65         return sha512_neon_finup(desc, NULL, 0, out);
  66 }
  67
  68 struct shash_alg sha512_neon_algs[] = { {
  69         .init                   = sha384_base_init,
  70         .update                 = sha512_neon_update,
  71         .final                  = sha512_neon_final,
  72         .finup                  = sha512_neon_finup,
  73         .descsize               = sizeof(struct sha512_state),
  74         .digestsize             = SHA384_DIGEST_SIZE,
  75         .base                   = {
  76                 .cra_name               = "sha384",
  77                 .cra_driver_name        = "sha384-neon",
  78                 .cra_priority           = 300,
  79                 .cra_blocksize          = SHA384_BLOCK_SIZE,
  80                 .cra_module             = THIS_MODULE,
  81
  82         }
  83 },  {
  84         .init                   = sha512_base_init,
  85         .update                 = sha512_neon_update,
  86         .final                  = sha512_neon_final,
  87         .finup                  = sha512_neon_finup,
  88         .descsize               = sizeof(struct sha512_state),
  89         .digestsize             = SHA512_DIGEST_SIZE,
  90         .base                   = {
  91                 .cra_name               = "sha512",
  92                 .cra_driver_name        = "sha512-neon",
  93                 .cra_priority           = 300,
  94                 .cra_blocksize          = SHA512_BLOCK_SIZE,
  95                 .cra_module             = THIS_MODULE,
  96         }
  97 } };