arch/arm64/crypto/sha512-ce-glue.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
   4  *
   5  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <asm/neon.h>
  13 #include <asm/simd.h>
  14 #include <asm/unaligned.h>
  15 #include <crypto/internal/hash.h>
  16 #include <crypto/sha.h>
  17 #include <crypto/sha512_base.h>
  18 #include <linux/cpufeature.h>
  19 #include <linux/crypto.h>
  20 #include <linux/module.h>
  21
  22 MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
  23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24 MODULE_LICENSE("GPL v2");
  25
  26 asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  27                                     int blocks);
  28
  29 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
  30
  31 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  32                             unsigned int len)
  33 {
  34         if (!may_use_simd())
  35                 return sha512_base_do_update(desc, data, len,
  36                                 (sha512_block_fn *)sha512_block_data_order);
  37
  38         kernel_neon_begin();
  39         sha512_base_do_update(desc, data, len,
  40                               (sha512_block_fn *)sha512_ce_transform);
  41         kernel_neon_end();
  42
  43         return 0;
  44 }
  45
  46 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  47                            unsigned int len, u8 *out)
  48 {
  49         if (!may_use_simd()) {
  50                 if (len)
  51                         sha512_base_do_update(desc, data, len,
  52                                 (sha512_block_fn *)sha512_block_data_order);
  53                 sha512_base_do_finalize(desc,
  54                                 (sha512_block_fn *)sha512_block_data_order);
  55                 return sha512_base_finish(desc, out);
  56         }
  57
  58         kernel_neon_begin();
  59         sha512_base_do_update(desc, data, len,
  60                               (sha512_block_fn *)sha512_ce_transform);
  61         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  62         kernel_neon_end();
  63         return sha512_base_finish(desc, out);
  64 }
  65
  66 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  67 {
  68         if (!may_use_simd()) {
  69                 sha512_base_do_finalize(desc,
  70                                 (sha512_block_fn *)sha512_block_data_order);
  71                 return sha512_base_finish(desc, out);
  72         }
  73
  74         kernel_neon_begin();
  75         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  76         kernel_neon_end();
  77         return sha512_base_finish(desc, out);
  78 }
  79
  80 static struct shash_alg algs[] = { {
  81         .init                   = sha384_base_init,
  82         .update                 = sha512_ce_update,
  83         .final                  = sha512_ce_final,
  84         .finup                  = sha512_ce_finup,
  85         .descsize               = sizeof(struct sha512_state),
  86         .digestsize             = SHA384_DIGEST_SIZE,
  87         .base.cra_name          = "sha384",
  88         .base.cra_driver_name   = "sha384-ce",
  89         .base.cra_priority      = 200,
  90         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  91         .base.cra_module        = THIS_MODULE,
  92 }, {
  93         .init                   = sha512_base_init,
  94         .update                 = sha512_ce_update,
  95         .final                  = sha512_ce_final,
  96         .finup                  = sha512_ce_finup,
  97         .descsize               = sizeof(struct sha512_state),
  98         .digestsize             = SHA512_DIGEST_SIZE,
  99         .base.cra_name          = "sha512",
 100         .base.cra_driver_name   = "sha512-ce",
 101         .base.cra_priority      = 200,
 102         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 103         .base.cra_module        = THIS_MODULE,
 104 } };
 105
 106 static int __init sha512_ce_mod_init(void)
 107 {
 108         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 109 }
 110
 111 static void __exit sha512_ce_mod_fini(void)
 112 {
 113         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 114 }
 115
 116 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 117 module_exit(sha512_ce_mod_fini);