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      = 100,
  71         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
  72         .base.cra_blocksize     = SHA256_BLOCK_SIZE,
  73         .base.cra_module        = THIS_MODULE,
  74 }, {
  75         .digestsize             = SHA224_DIGEST_SIZE,
  76         .init                   = sha224_base_init,
  77         .update                 = sha256_update,
  78         .final                  = sha256_final,
  79         .finup                  = sha256_finup,
  80         .descsize               = sizeof(struct sha256_state),
  81         .base.cra_name          = "sha224",
  82         .base.cra_driver_name   = "sha224-arm64",
  83         .base.cra_priority      = 100,
  84         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
  85         .base.cra_blocksize     = SHA224_BLOCK_SIZE,
  86         .base.cra_module        = THIS_MODULE,
  87 } };
  88
  89 static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
  90                               unsigned int len)
  91 {
  92         struct sha256_state *sctx = shash_desc_ctx(desc);
  93
  94         if (!may_use_simd())
  95                 return sha256_base_do_update(desc, data, len,
  96                                 (sha256_block_fn *)sha256_block_data_order);
  97
  98         while (len > 0) {
  99                 unsigned int chunk = len;
 100
 101                 /*
 102                  * Don't hog the CPU for the entire time it takes to process all
 103                  * input when running on a preemptible kernel, but process the
 104                  * data block by block instead.
 105                  */
 106                 if (IS_ENABLED(CONFIG_PREEMPT) &&
 107                     chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
 108                         chunk = SHA256_BLOCK_SIZE -
 109                                 sctx->count % SHA256_BLOCK_SIZE;
 110
 111                 kernel_neon_begin();
 112                 sha256_base_do_update(desc, data, chunk,
 113                                       (sha256_block_fn *)sha256_block_neon);
 114                 kernel_neon_end();
 115                 data += chunk;
 116                 len -= chunk;
 117         }
 118         return 0;
 119 }
 120
 121 static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
 122                              unsigned int len, u8 *out)
 123 {
 124         if (!may_use_simd()) {
 125                 if (len)
 126                         sha256_base_do_update(desc, data, len,
 127                                 (sha256_block_fn *)sha256_block_data_order);
 128                 sha256_base_do_finalize(desc,
 129                                 (sha256_block_fn *)sha256_block_data_order);
 130         } else {
 131                 if (len)
 132                         sha256_update_neon(desc, data, len);
 133                 kernel_neon_begin();
 134                 sha256_base_do_finalize(desc,
 135                                 (sha256_block_fn *)sha256_block_neon);
 136                 kernel_neon_end();
 137         }
 138         return sha256_base_finish(desc, out);
 139 }
 140
 141 static int sha256_final_neon(struct shash_desc *desc, u8 *out)
 142 {
 143         return sha256_finup_neon(desc, NULL, 0, out);
 144 }
 145
 146 static struct shash_alg neon_algs[] = { {
 147         .digestsize             = SHA256_DIGEST_SIZE,
 148         .init                   = sha256_base_init,
 149         .update                 = sha256_update_neon,
 150         .final                  = sha256_final_neon,
 151         .finup                  = sha256_finup_neon,
 152         .descsize               = sizeof(struct sha256_state),
 153         .base.cra_name          = "sha256",
 154         .base.cra_driver_name   = "sha256-arm64-neon",
 155         .base.cra_priority      = 150,
 156         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 157         .base.cra_blocksize     = SHA256_BLOCK_SIZE,
 158         .base.cra_module        = THIS_MODULE,
 159 }, {
 160         .digestsize             = SHA224_DIGEST_SIZE,
 161         .init                   = sha224_base_init,
 162         .update                 = sha256_update_neon,
 163         .final                  = sha256_final_neon,
 164         .finup                  = sha256_finup_neon,
 165         .descsize               = sizeof(struct sha256_state),
 166         .base.cra_name          = "sha224",
 167         .base.cra_driver_name   = "sha224-arm64-neon",
 168         .base.cra_priority      = 150,
 169         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 170         .base.cra_blocksize     = SHA224_BLOCK_SIZE,
 171         .base.cra_module        = THIS_MODULE,
 172 } };
 173
 174 static int __init sha256_mod_init(void)
 175 {
 176         int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
 177         if (ret)
 178                 return ret;
 179
 180         if (elf_hwcap & HWCAP_ASIMD) {
 181                 ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 182                 if (ret)
 183                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 184         }
 185         return ret;
 186 }
 187
 188 static void __exit sha256_mod_fini(void)
 189 {
 190         if (elf_hwcap & HWCAP_ASIMD)
 191                 crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 192         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 193 }
 194
 195 module_init(sha256_mod_init);
 196 module_exit(sha256_mod_fini);