arch/arm64/crypto/sha256-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64
   4  *
   5  * Copyright (c) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <asm/hwcap.h>
   9 #include <asm/neon.h>
  10 #include <asm/simd.h>
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/internal/simd.h>
  13 #include <crypto/sha2.h>
  14 #include <crypto/sha256_base.h>
  15 #include <linux/types.h>
  16 #include <linux/string.h>
  17
  18 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64");
  19 MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>");
  20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21 MODULE_LICENSE("GPL v2");
  22 MODULE_ALIAS_CRYPTO("sha224");
  23 MODULE_ALIAS_CRYPTO("sha256");
  24
  25 asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
  26                                         unsigned int num_blks);
  27 EXPORT_SYMBOL(sha256_block_data_order);
  28
  29 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
  30                                       int blocks)
  31 {
  32         sha256_block_data_order(sst->state, src, blocks);
  33 }
  34
  35 asmlinkage void sha256_block_neon(u32 *digest, const void *data,
  36                                   unsigned int num_blks);
  37
  38 static void __sha256_block_neon(struct sha256_state *sst, u8 const *src,
  39                                 int blocks)
  40 {
  41         sha256_block_neon(sst->state, src, blocks);
  42 }
  43
  44 static int crypto_sha256_arm64_update(struct shash_desc *desc, const u8 *data,
  45                                       unsigned int len)
  46 {
  47         return sha256_base_do_update(desc, data, len,
  48                                      __sha256_block_data_order);
  49 }
  50
  51 static int crypto_sha256_arm64_finup(struct shash_desc *desc, const u8 *data,
  52                                      unsigned int len, u8 *out)
  53 {
  54         if (len)
  55                 sha256_base_do_update(desc, data, len,
  56                                       __sha256_block_data_order);
  57         sha256_base_do_finalize(desc, __sha256_block_data_order);
  58
  59         return sha256_base_finish(desc, out);
  60 }
  61
  62 static int crypto_sha256_arm64_final(struct shash_desc *desc, u8 *out)
  63 {
  64         return crypto_sha256_arm64_finup(desc, NULL, 0, out);
  65 }
  66
  67 static struct shash_alg algs[] = { {
  68         .digestsize             = SHA256_DIGEST_SIZE,
  69         .init                   = sha256_base_init,
  70         .update                 = crypto_sha256_arm64_update,
  71         .final                  = crypto_sha256_arm64_final,
  72         .finup                  = crypto_sha256_arm64_finup,
  73         .descsize               = sizeof(struct sha256_state),
  74         .base.cra_name          = "sha256",
  75         .base.cra_driver_name   = "sha256-arm64",
  76         .base.cra_priority      = 125,
  77         .base.cra_blocksize     = SHA256_BLOCK_SIZE,
  78         .base.cra_module        = THIS_MODULE,
  79 }, {
  80         .digestsize             = SHA224_DIGEST_SIZE,
  81         .init                   = sha224_base_init,
  82         .update                 = crypto_sha256_arm64_update,
  83         .final                  = crypto_sha256_arm64_final,
  84         .finup                  = crypto_sha256_arm64_finup,
  85         .descsize               = sizeof(struct sha256_state),
  86         .base.cra_name          = "sha224",
  87         .base.cra_driver_name   = "sha224-arm64",
  88         .base.cra_priority      = 125,
  89         .base.cra_blocksize     = SHA224_BLOCK_SIZE,
  90         .base.cra_module        = THIS_MODULE,
  91 } };
  92
  93 static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
  94                               unsigned int len)
  95 {
  96         struct sha256_state *sctx = shash_desc_ctx(desc);
  97
  98         if (!crypto_simd_usable())
  99                 return sha256_base_do_update(desc, data, len,
 100                                 __sha256_block_data_order);
 101
 102         while (len > 0) {
 103                 unsigned int chunk = len;
 104
 105                 /*
 106                  * Don't hog the CPU for the entire time it takes to process all
 107                  * input when running on a preemptible kernel, but process the
 108                  * data block by block instead.
 109                  */
 110                 if (IS_ENABLED(CONFIG_PREEMPTION) &&
 111                     chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
 112                         chunk = SHA256_BLOCK_SIZE -
 113                                 sctx->count % SHA256_BLOCK_SIZE;
 114
 115                 kernel_neon_begin();
 116                 sha256_base_do_update(desc, data, chunk, __sha256_block_neon);
 117                 kernel_neon_end();
 118                 data += chunk;
 119                 len -= chunk;
 120         }
 121         return 0;
 122 }
 123
 124 static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
 125                              unsigned int len, u8 *out)
 126 {
 127         if (!crypto_simd_usable()) {
 128                 if (len)
 129                         sha256_base_do_update(desc, data, len,
 130                                 __sha256_block_data_order);
 131                 sha256_base_do_finalize(desc, __sha256_block_data_order);
 132         } else {
 133                 if (len)
 134                         sha256_update_neon(desc, data, len);
 135                 kernel_neon_begin();
 136                 sha256_base_do_finalize(desc, __sha256_block_neon);
 137                 kernel_neon_end();
 138         }
 139         return sha256_base_finish(desc, out);
 140 }
 141
 142 static int sha256_final_neon(struct shash_desc *desc, u8 *out)
 143 {
 144         return sha256_finup_neon(desc, NULL, 0, out);
 145 }
 146
 147 static struct shash_alg neon_algs[] = { {
 148         .digestsize             = SHA256_DIGEST_SIZE,
 149         .init                   = sha256_base_init,
 150         .update                 = sha256_update_neon,
 151         .final                  = sha256_final_neon,
 152         .finup                  = sha256_finup_neon,
 153         .descsize               = sizeof(struct sha256_state),
 154         .base.cra_name          = "sha256",
 155         .base.cra_driver_name   = "sha256-arm64-neon",
 156         .base.cra_priority      = 150,
 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_blocksize     = SHA224_BLOCK_SIZE,
 170         .base.cra_module        = THIS_MODULE,
 171 } };
 172
 173 static int __init sha256_mod_init(void)
 174 {
 175         int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
 176         if (ret)
 177                 return ret;
 178
 179         if (cpu_have_named_feature(ASIMD)) {
 180                 ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 181                 if (ret)
 182                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 183         }
 184         return ret;
 185 }
 186
 187 static void __exit sha256_mod_fini(void)
 188 {
 189         if (cpu_have_named_feature(ASIMD))
 190                 crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
 191         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 192 }
 193
 194 module_init(sha256_mod_init);
 195 module_exit(sha256_mod_fini);