arch/arm64/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) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <asm/neon.h>
   9 #include <asm/simd.h>
  10 #include <asm/unaligned.h>
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/internal/simd.h>
  13 #include <crypto/sha.h>
  14 #include <crypto/sha256_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21 MODULE_LICENSE("GPL v2");
  22
  23 struct sha256_ce_state {
  24         struct sha256_state     sst;
  25         u32                     finalize;
  26 };
  27
  28 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  29                                   int blocks);
  30
  31 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
  32                                 int blocks)
  33 {
  34         sha2_ce_transform(container_of(sst, struct sha256_ce_state, sst), src,
  35                           blocks);
  36 }
  37
  38 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  39                                               sst.count);
  40 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  41                                                  finalize);
  42
  43 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
  44
  45 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
  46                                       int blocks)
  47 {
  48         sha256_block_data_order(sst->state, src, blocks);
  49 }
  50
  51 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  52                             unsigned int len)
  53 {
  54         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  55
  56         if (!crypto_simd_usable())
  57                 return sha256_base_do_update(desc, data, len,
  58                                 __sha256_block_data_order);
  59
  60         sctx->finalize = 0;
  61         kernel_neon_begin();
  62         sha256_base_do_update(desc, data, len, __sha2_ce_transform);
  63         kernel_neon_end();
  64
  65         return 0;
  66 }
  67
  68 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  69                            unsigned int len, u8 *out)
  70 {
  71         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  72         bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
  73
  74         if (!crypto_simd_usable()) {
  75                 if (len)
  76                         sha256_base_do_update(desc, data, len,
  77                                 __sha256_block_data_order);
  78                 sha256_base_do_finalize(desc, __sha256_block_data_order);
  79                 return sha256_base_finish(desc, out);
  80         }
  81
  82         /*
  83          * Allow the asm code to perform the finalization if there is no
  84          * partial data and the input is a round multiple of the block size.
  85          */
  86         sctx->finalize = finalize;
  87
  88         kernel_neon_begin();
  89         sha256_base_do_update(desc, data, len, __sha2_ce_transform);
  90         if (!finalize)
  91                 sha256_base_do_finalize(desc, __sha2_ce_transform);
  92         kernel_neon_end();
  93         return sha256_base_finish(desc, out);
  94 }
  95
  96 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
  97 {
  98         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  99
 100         if (!crypto_simd_usable()) {
 101                 sha256_base_do_finalize(desc, __sha256_block_data_order);
 102                 return sha256_base_finish(desc, out);
 103         }
 104
 105         sctx->finalize = 0;
 106         kernel_neon_begin();
 107         sha256_base_do_finalize(desc, __sha2_ce_transform);
 108         kernel_neon_end();
 109         return sha256_base_finish(desc, out);
 110 }
 111
 112 static struct shash_alg algs[] = { {
 113         .init                   = sha224_base_init,
 114         .update                 = sha256_ce_update,
 115         .final                  = sha256_ce_final,
 116         .finup                  = sha256_ce_finup,
 117         .descsize               = sizeof(struct sha256_ce_state),
 118         .digestsize             = SHA224_DIGEST_SIZE,
 119         .base                   = {
 120                 .cra_name               = "sha224",
 121                 .cra_driver_name        = "sha224-ce",
 122                 .cra_priority           = 200,
 123                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 124                 .cra_module             = THIS_MODULE,
 125         }
 126 }, {
 127         .init                   = sha256_base_init,
 128         .update                 = sha256_ce_update,
 129         .final                  = sha256_ce_final,
 130         .finup                  = sha256_ce_finup,
 131         .descsize               = sizeof(struct sha256_ce_state),
 132         .digestsize             = SHA256_DIGEST_SIZE,
 133         .base                   = {
 134                 .cra_name               = "sha256",
 135                 .cra_driver_name        = "sha256-ce",
 136                 .cra_priority           = 200,
 137                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 138                 .cra_module             = THIS_MODULE,
 139         }
 140 } };
 141
 142 static int __init sha2_ce_mod_init(void)
 143 {
 144         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 145 }
 146
 147 static void __exit sha2_ce_mod_fini(void)
 148 {
 149         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 150 }
 151
 152 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 153 module_exit(sha2_ce_mod_fini);