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 MODULE_ALIAS_CRYPTO("sha384");
  26 MODULE_ALIAS_CRYPTO("sha512");
  27
  28 asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  29                                     int blocks);
  30
  31 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
  32
  33 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  34                             unsigned int len)
  35 {
  36         if (!may_use_simd())
  37                 return sha512_base_do_update(desc, data, len,
  38                                 (sha512_block_fn *)sha512_block_data_order);
  39
  40         kernel_neon_begin();
  41         sha512_base_do_update(desc, data, len,
  42                               (sha512_block_fn *)sha512_ce_transform);
  43         kernel_neon_end();
  44
  45         return 0;
  46 }
  47
  48 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  49                            unsigned int len, u8 *out)
  50 {
  51         if (!may_use_simd()) {
  52                 if (len)
  53                         sha512_base_do_update(desc, data, len,
  54                                 (sha512_block_fn *)sha512_block_data_order);
  55                 sha512_base_do_finalize(desc,
  56                                 (sha512_block_fn *)sha512_block_data_order);
  57                 return sha512_base_finish(desc, out);
  58         }
  59
  60         kernel_neon_begin();
  61         sha512_base_do_update(desc, data, len,
  62                               (sha512_block_fn *)sha512_ce_transform);
  63         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  64         kernel_neon_end();
  65         return sha512_base_finish(desc, out);
  66 }
  67
  68 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  69 {
  70         if (!may_use_simd()) {
  71                 sha512_base_do_finalize(desc,
  72                                 (sha512_block_fn *)sha512_block_data_order);
  73                 return sha512_base_finish(desc, out);
  74         }
  75
  76         kernel_neon_begin();
  77         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  78         kernel_neon_end();
  79         return sha512_base_finish(desc, out);
  80 }
  81
  82 static struct shash_alg algs[] = { {
  83         .init                   = sha384_base_init,
  84         .update                 = sha512_ce_update,
  85         .final                  = sha512_ce_final,
  86         .finup                  = sha512_ce_finup,
  87         .descsize               = sizeof(struct sha512_state),
  88         .digestsize             = SHA384_DIGEST_SIZE,
  89         .base.cra_name          = "sha384",
  90         .base.cra_driver_name   = "sha384-ce",
  91         .base.cra_priority      = 200,
  92         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  93         .base.cra_module        = THIS_MODULE,
  94 }, {
  95         .init                   = sha512_base_init,
  96         .update                 = sha512_ce_update,
  97         .final                  = sha512_ce_final,
  98         .finup                  = sha512_ce_finup,
  99         .descsize               = sizeof(struct sha512_state),
 100         .digestsize             = SHA512_DIGEST_SIZE,
 101         .base.cra_name          = "sha512",
 102         .base.cra_driver_name   = "sha512-ce",
 103         .base.cra_priority      = 200,
 104         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 105         .base.cra_module        = THIS_MODULE,
 106 } };
 107
 108 static int __init sha512_ce_mod_init(void)
 109 {
 110         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 111 }
 112
 113 static void __exit sha512_ce_mod_fini(void)
 114 {
 115         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 116 }
 117
 118 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 119 module_exit(sha512_ce_mod_fini);