arch/arm/crypto/sha2-ce-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
   4  *
   5  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <crypto/internal/hash.h>
   9 #include <crypto/internal/simd.h>
  10 #include <crypto/sha2.h>
  11 #include <crypto/sha256_base.h>
  12 #include <linux/cpufeature.h>
  13 #include <linux/crypto.h>
  14 #include <linux/module.h>
  15
  16 #include <asm/hwcap.h>
  17 #include <asm/simd.h>
  18 #include <asm/neon.h>
  19 #include <asm/unaligned.h>
  20
  21 #include "sha256_glue.h"
  22
  23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  25 MODULE_LICENSE("GPL v2");
  26
  27 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
  28                                   int blocks);
  29
  30 static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
  31                           unsigned int len)
  32 {
  33         struct sha256_state *sctx = shash_desc_ctx(desc);
  34
  35         if (!crypto_simd_usable() ||
  36             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
  37                 return crypto_sha256_arm_update(desc, data, len);
  38
  39         kernel_neon_begin();
  40         sha256_base_do_update(desc, data, len,
  41                               (sha256_block_fn *)sha2_ce_transform);
  42         kernel_neon_end();
  43
  44         return 0;
  45 }
  46
  47 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
  48                          unsigned int len, u8 *out)
  49 {
  50         if (!crypto_simd_usable())
  51                 return crypto_sha256_arm_finup(desc, data, len, out);
  52
  53         kernel_neon_begin();
  54         if (len)
  55                 sha256_base_do_update(desc, data, len,
  56                                       (sha256_block_fn *)sha2_ce_transform);
  57         sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
  58         kernel_neon_end();
  59
  60         return sha256_base_finish(desc, out);
  61 }
  62
  63 static int sha2_ce_final(struct shash_desc *desc, u8 *out)
  64 {
  65         return sha2_ce_finup(desc, NULL, 0, out);
  66 }
  67
  68 static struct shash_alg algs[] = { {
  69         .init                   = sha224_base_init,
  70         .update                 = sha2_ce_update,
  71         .final                  = sha2_ce_final,
  72         .finup                  = sha2_ce_finup,
  73         .descsize               = sizeof(struct sha256_state),
  74         .digestsize             = SHA224_DIGEST_SIZE,
  75         .base                   = {
  76                 .cra_name               = "sha224",
  77                 .cra_driver_name        = "sha224-ce",
  78                 .cra_priority           = 300,
  79                 .cra_blocksize          = SHA256_BLOCK_SIZE,
  80                 .cra_module             = THIS_MODULE,
  81         }
  82 }, {
  83         .init                   = sha256_base_init,
  84         .update                 = sha2_ce_update,
  85         .final                  = sha2_ce_final,
  86         .finup                  = sha2_ce_finup,
  87         .descsize               = sizeof(struct sha256_state),
  88         .digestsize             = SHA256_DIGEST_SIZE,
  89         .base                   = {
  90                 .cra_name               = "sha256",
  91                 .cra_driver_name        = "sha256-ce",
  92                 .cra_priority           = 300,
  93                 .cra_blocksize          = SHA256_BLOCK_SIZE,
  94                 .cra_module             = THIS_MODULE,
  95         }
  96 } };
  97
  98 static int __init sha2_ce_mod_init(void)
  99 {
 100         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 101 }
 102
 103 static void __exit sha2_ce_mod_fini(void)
 104 {
 105         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 106 }
 107
 108 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 109 module_exit(sha2_ce_mod_fini);