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 void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
  33                                       int blocks)
  34 {
  35         sha512_block_data_order(sst->state, src, blocks);
  36 }
  37
  38 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  39                             unsigned int len)
  40 {
  41         if (!crypto_simd_usable())
  42                 return sha512_base_do_update(desc, data, len,
  43                                              __sha512_block_data_order);
  44
  45         kernel_neon_begin();
  46         sha512_base_do_update(desc, data, len, sha512_ce_transform);
  47         kernel_neon_end();
  48
  49         return 0;
  50 }
  51
  52 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  53                            unsigned int len, u8 *out)
  54 {
  55         if (!crypto_simd_usable()) {
  56                 if (len)
  57                         sha512_base_do_update(desc, data, len,
  58                                               __sha512_block_data_order);
  59                 sha512_base_do_finalize(desc, __sha512_block_data_order);
  60                 return sha512_base_finish(desc, out);
  61         }
  62
  63         kernel_neon_begin();
  64         sha512_base_do_update(desc, data, len, sha512_ce_transform);
  65         sha512_base_do_finalize(desc, sha512_ce_transform);
  66         kernel_neon_end();
  67         return sha512_base_finish(desc, out);
  68 }
  69
  70 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  71 {
  72         if (!crypto_simd_usable()) {
  73                 sha512_base_do_finalize(desc, __sha512_block_data_order);
  74                 return sha512_base_finish(desc, out);
  75         }
  76
  77         kernel_neon_begin();
  78         sha512_base_do_finalize(desc, sha512_ce_transform);
  79         kernel_neon_end();
  80         return sha512_base_finish(desc, out);
  81 }
  82
  83 static struct shash_alg algs[] = { {
  84         .init                   = sha384_base_init,
  85         .update                 = sha512_ce_update,
  86         .final                  = sha512_ce_final,
  87         .finup                  = sha512_ce_finup,
  88         .descsize               = sizeof(struct sha512_state),
  89         .digestsize             = SHA384_DIGEST_SIZE,
  90         .base.cra_name          = "sha384",
  91         .base.cra_driver_name   = "sha384-ce",
  92         .base.cra_priority      = 200,
  93         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  94         .base.cra_module        = THIS_MODULE,
  95 }, {
  96         .init                   = sha512_base_init,
  97         .update                 = sha512_ce_update,
  98         .final                  = sha512_ce_final,
  99         .finup                  = sha512_ce_finup,
 100         .descsize               = sizeof(struct sha512_state),
 101         .digestsize             = SHA512_DIGEST_SIZE,
 102         .base.cra_name          = "sha512",
 103         .base.cra_driver_name   = "sha512-ce",
 104         .base.cra_priority      = 200,
 105         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 106         .base.cra_module        = THIS_MODULE,
 107 } };
 108
 109 static int __init sha512_ce_mod_init(void)
 110 {
 111         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 112 }
 113
 114 static void __exit sha512_ce_mod_fini(void)
 115 {
 116         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 117 }
 118
 119 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 120 module_exit(sha512_ce_mod_fini);