arch/arm64/crypto/sha2-ce-glue.c

   1 /*
   2  * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
   3  *
   4  * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <asm/neon.h>
  12 #include <asm/simd.h>
  13 #include <asm/unaligned.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/sha.h>
  16 #include <crypto/sha256_base.h>
  17 #include <linux/cpufeature.h>
  18 #include <linux/crypto.h>
  19 #include <linux/module.h>
  20
  21 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  23 MODULE_LICENSE("GPL v2");
  24
  25 struct sha256_ce_state {
  26         struct sha256_state     sst;
  27         u32                     finalize;
  28 };
  29
  30 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  31                                   int blocks);
  32
  33 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  34                                               sst.count);
  35 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  36                                                  finalize);
  37
  38 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
  39
  40 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  41                             unsigned int len)
  42 {
  43         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  44
  45         if (!may_use_simd())
  46                 return sha256_base_do_update(desc, data, len,
  47                                 (sha256_block_fn *)sha256_block_data_order);
  48
  49         sctx->finalize = 0;
  50         kernel_neon_begin();
  51         sha256_base_do_update(desc, data, len,
  52                               (sha256_block_fn *)sha2_ce_transform);
  53         kernel_neon_end();
  54
  55         return 0;
  56 }
  57
  58 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  59                            unsigned int len, u8 *out)
  60 {
  61         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  62         bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
  63
  64         if (!may_use_simd()) {
  65                 if (len)
  66                         sha256_base_do_update(desc, data, len,
  67                                 (sha256_block_fn *)sha256_block_data_order);
  68                 sha256_base_do_finalize(desc,
  69                                 (sha256_block_fn *)sha256_block_data_order);
  70                 return sha256_base_finish(desc, out);
  71         }
  72
  73         /*
  74          * Allow the asm code to perform the finalization if there is no
  75          * partial data and the input is a round multiple of the block size.
  76          */
  77         sctx->finalize = finalize;
  78
  79         kernel_neon_begin();
  80         sha256_base_do_update(desc, data, len,
  81                               (sha256_block_fn *)sha2_ce_transform);
  82         if (!finalize)
  83                 sha256_base_do_finalize(desc,
  84                                         (sha256_block_fn *)sha2_ce_transform);
  85         kernel_neon_end();
  86         return sha256_base_finish(desc, out);
  87 }
  88
  89 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
  90 {
  91         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  92
  93         if (!may_use_simd()) {
  94                 sha256_base_do_finalize(desc,
  95                                 (sha256_block_fn *)sha256_block_data_order);
  96                 return sha256_base_finish(desc, out);
  97         }
  98
  99         sctx->finalize = 0;
 100         kernel_neon_begin();
 101         sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
 102         kernel_neon_end();
 103         return sha256_base_finish(desc, out);
 104 }
 105
 106 static struct shash_alg algs[] = { {
 107         .init                   = sha224_base_init,
 108         .update                 = sha256_ce_update,
 109         .final                  = sha256_ce_final,
 110         .finup                  = sha256_ce_finup,
 111         .descsize               = sizeof(struct sha256_ce_state),
 112         .digestsize             = SHA224_DIGEST_SIZE,
 113         .base                   = {
 114                 .cra_name               = "sha224",
 115                 .cra_driver_name        = "sha224-ce",
 116                 .cra_priority           = 200,
 117                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 118                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 119                 .cra_module             = THIS_MODULE,
 120         }
 121 }, {
 122         .init                   = sha256_base_init,
 123         .update                 = sha256_ce_update,
 124         .final                  = sha256_ce_final,
 125         .finup                  = sha256_ce_finup,
 126         .descsize               = sizeof(struct sha256_ce_state),
 127         .digestsize             = SHA256_DIGEST_SIZE,
 128         .base                   = {
 129                 .cra_name               = "sha256",
 130                 .cra_driver_name        = "sha256-ce",
 131                 .cra_priority           = 200,
 132                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 133                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 134                 .cra_module             = THIS_MODULE,
 135         }
 136 } };
 137
 138 static int __init sha2_ce_mod_init(void)
 139 {
 140         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 141 }
 142
 143 static void __exit sha2_ce_mod_fini(void)
 144 {
 145         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 146 }
 147
 148 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 149 module_exit(sha2_ce_mod_fini);