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/internal/simd.h>
  17 #include <crypto/sha.h>
  18 #include <crypto/sha512_base.h>
  19 #include <linux/cpufeature.h>
  20 #include <linux/crypto.h>
  21 #include <linux/module.h>
  22
  23 MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
  24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  25 MODULE_LICENSE("GPL v2");
  26
  27 asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  28                                     int blocks);
  29
  30 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
  31
  32 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  33                             unsigned int len)
  34 {
  35         if (!crypto_simd_usable())
  36                 return sha512_base_do_update(desc, data, len,
  37                                 (sha512_block_fn *)sha512_block_data_order);
  38
  39         kernel_neon_begin();
  40         sha512_base_do_update(desc, data, len,
  41                               (sha512_block_fn *)sha512_ce_transform);
  42         kernel_neon_end();
  43
  44         return 0;
  45 }
  46
  47 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  48                            unsigned int len, u8 *out)
  49 {
  50         if (!crypto_simd_usable()) {
  51                 if (len)
  52                         sha512_base_do_update(desc, data, len,
  53                                 (sha512_block_fn *)sha512_block_data_order);
  54                 sha512_base_do_finalize(desc,
  55                                 (sha512_block_fn *)sha512_block_data_order);
  56                 return sha512_base_finish(desc, out);
  57         }
  58
  59         kernel_neon_begin();
  60         sha512_base_do_update(desc, data, len,
  61                               (sha512_block_fn *)sha512_ce_transform);
  62         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  63         kernel_neon_end();
  64         return sha512_base_finish(desc, out);
  65 }
  66
  67 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  68 {
  69         if (!crypto_simd_usable()) {
  70                 sha512_base_do_finalize(desc,
  71                                 (sha512_block_fn *)sha512_block_data_order);
  72                 return sha512_base_finish(desc, out);
  73         }
  74
  75         kernel_neon_begin();
  76         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  77         kernel_neon_end();
  78         return sha512_base_finish(desc, out);
  79 }
  80
  81 static struct shash_alg algs[] = { {
  82         .init                   = sha384_base_init,
  83         .update                 = sha512_ce_update,
  84         .final                  = sha512_ce_final,
  85         .finup                  = sha512_ce_finup,
  86         .descsize               = sizeof(struct sha512_state),
  87         .digestsize             = SHA384_DIGEST_SIZE,
  88         .base.cra_name          = "sha384",
  89         .base.cra_driver_name   = "sha384-ce",
  90         .base.cra_priority      = 200,
  91         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  92         .base.cra_module        = THIS_MODULE,
  93 }, {
  94         .init                   = sha512_base_init,
  95         .update                 = sha512_ce_update,
  96         .final                  = sha512_ce_final,
  97         .finup                  = sha512_ce_finup,
  98         .descsize               = sizeof(struct sha512_state),
  99         .digestsize             = SHA512_DIGEST_SIZE,
 100         .base.cra_name          = "sha512",
 101         .base.cra_driver_name   = "sha512-ce",
 102         .base.cra_priority      = 200,
 103         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 104         .base.cra_module        = THIS_MODULE,
 105 } };
 106
 107 static int __init sha512_ce_mod_init(void)
 108 {
 109         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 110 }
 111
 112 static void __exit sha512_ce_mod_fini(void)
 113 {
 114         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 115 }
 116
 117 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 118 module_exit(sha512_ce_mod_fini);