arch/arm64/crypto/sha256-glue.c

   1 /*
   2  * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64
   3  *
   4  * Copyright (c) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <asm/hwcap.h>
  14 #include <asm/neon.h>
  15 #include <asm/simd.h>
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/sha.h>
  18 #include <crypto/sha256_base.h>
  19 #include <linux/cryptohash.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22
  23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64");
  24 MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>");
  25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  26 MODULE_LICENSE("GPL v2");
  27 MODULE_ALIAS_CRYPTO("sha224");
  28 MODULE_ALIAS_CRYPTO("sha256");
  29
  30 asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
  31                                         unsigned int num_blks);
  32 EXPORT_SYMBOL(sha256_block_data_order);
  33
  34 asmlinkage void sha256_block_neon(u32 *digest, const void *data,
  35                                   unsigned int num_blks);
  36
  37 static int sha256_update(struct shash_desc *desc, const u8 *data,
  38                          unsigned int len)
  39 {
  40         return sha256_base_do_update(desc, data, len,
  41                                 (sha256_block_fn *)sha256_block_data_order);
  42 }
  43
  44 static int sha256_finup(struct shash_desc *desc, const u8 *data,
  45                         unsigned int len, u8 *out)
  46 {
  47         if (len)
  48                 sha256_base_do_update(desc, data, len,
  49                                 (sha256_block_fn *)sha256_block_data_order);
  50         sha256_base_do_finalize(desc,
  51                                 (sha256_block_fn *)sha256_block_data_order);
  52
  53         return sha256_base_finish(desc, out);
  54 }
  55
  56 static int sha256_final(struct shash_desc *desc, u8 *out)
  57 {
  58         return sha256_finup(desc, NULL, 0, out);
  59 }
  60
  61 static struct shash_alg algs[] = { {
  62         .digestsize             = SHA256_DIGEST_SIZE,
  63         .init                   = sha256_base_init,
  64         .update                 = sha256_update,
  65         .final                  = sha256_final,
  66         .finup                  = sha256_finup,
  67         .descsize               = sizeof(struct sha256_state),
  68         .base.cra_name          = "sha256",
  69         .base.cra_driver_name   = "sha256-arm64",
  70         .base.cra_priority      = 125,
  71         .base.cra_blocksize     = SHA256_BLOCK_SIZE,
  72         .base.cra_module        = THIS_MODULE,
  73 }, {
  74         .digestsize             = SHA224_DIGEST_SIZE,
  75         .init                   = sha224_base_init,
  76         .update                 = sha256_update,
  77         .final                  = sha256_final,
  78         .finup                  = sha256_finup,
  79         .descsize               = sizeof(struct sha256_state),
  80         .base.cra_name          = "sha224",
  81         .base.cra_driver_name   = "sha224-arm64",
  82         .base.cra_priority      = 125,
  83         .base.cra_blocksize     = SHA224_BLOCK_SIZE,
  84         .base.cra_module        = THIS_MODULE,
  85 } };
  86
  87 static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
  88                               unsigned int len)
  89 {
  90         struct sha256_state *sctx = shash_desc_ctx(desc);
  91
  92         if (!may_use_simd())
  93                 return sha256_base_do_update(desc, data, len,
  94                                 (sha256_block_fn *)sha256_block_data_order);
  95
  96         while (len > 0) {
  97                 unsigned int chunk = len;
  98
  99                 /*
 100                  * Don't hog the CPU for the entire time it takes to process all
 101                  * input when running on a preemptible kernel, but process the
 102                  * data block by block instead.
 103                  */
 104                 if (IS_ENABLED(CONFIG_PREEMPT) &&
 105                     chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
 106                         chunk = SHA256_BLOCK_SIZE -
 107                                 sctx->count % SHA256_BLOCK_SIZE;
 108
 109                 kernel_neon_begin();
 110                 sha256_base_do_update(desc, data, chunk,
 111                                       (sha256_block_fn *)sha256_block_neon);
 112                 kernel_neon_end();
 113                 data += chunk;
 114                 len -= chunk;
 115         }
 116         return 0;
 117 }
 118
 119 static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
 120                              unsigned int len, u8 *out)
 121 {
 122         if (!may_use_simd()) {
 123                 if (len)
 124                         sha256_base_do_update(desc, data, len,
 125                                 (sha256_block_fn *)sha256_block_data_order);
 126                 sha256_base_do_finalize(desc,
 127                                 (sha256_block_fn *)sha256_block_data_order);
 128         } else {
 129                 if (len)
 130                         sha256_update_neon(desc, data, len);
 131                 kernel_neon_begin();
 132                 sha256_base_do_finalize(desc,
 133                                 (sha256_block_fn *)sha256_block_neon);
 134                 kernel_neon_end();
 135         }
 136         return sha256_base_finish(desc, out);
 137 }
 138
 139 static int sha256_final_neon(struct shash_desc *desc, u8 *out)
 140 {
 141         return sha256_finup_neon(desc, NULL, 0, out);
 142 }
 143
 144 static struct shash_alg neon_algs[] = { {
 145         .digestsize             = SHA256_DIGEST_SIZE,
 146         .init                   = sha256_base_init,
 147         .update                 = sha256_update_neon,
 148         .final                  = sha256_final_neon,
 149         .finup                  = sha256_finup_neon,
 150         .descsize               = sizeof(struct sha256_state),
 151         .base.cra_name          = "sha256",
 152         .base.cra_driver_name   = "sha256-arm64-neon",
 153         .base.cra_priority      = 150,
 154         .base.cra_blocksize     = SHA256_BLOCK_SIZE,
 155         .base.cra_module        = THIS_MODULE,
 156 }, {
 157         .digestsize             = SHA224_DIGEST_SIZE,
 158         .init                   = sha224_base_init,
 159         .update                 = sha256_update_neon,
 160         .final                  = sha256_final_neon,
 161         .finup                  = sha256_finup_neon,
 162         .descsize               = sizeof(struct sha256_state),
 163         .base.cra_name          = "sha224",
 164         .base.cra_driver_name   = "sha224-arm64-neon",
 165         .base.cra_priority      = 150,
 166         .base.cra_blocksize     = SHA224_BLOCK_SIZE,
 167         .base.cra_module        = THIS_MODULE,
 168 } };
 169
 170 static int __init sha256_mod_init(void)
 171 {
 172         int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
 173         if (ret)
 174                 return ret;
 175
 176         if (elf_hwcap & HWCAP_ASIMD) {
 177                 ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 178                 if (ret)
 179                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 180         }
 181         return ret;
 182 }
 183
 184 static void __exit sha256_mod_fini(void)
 185 {
 186         if (elf_hwcap & HWCAP_ASIMD)
 187                 crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 188         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 189 }
 190
 191 module_init(sha256_mod_init);
 192 module_exit(sha256_mod_fini);