arch/arm64/crypto/sha1-ce-glue.c

   1 /*
   2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   3  *
   4  * Copyright (C) 2014 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/unaligned.h>
  13 #include <crypto/internal/hash.h>
  14 #include <crypto/sha.h>
  15 #include <crypto/sha1_base.h>
  16 #include <linux/cpufeature.h>
  17 #include <linux/crypto.h>
  18 #include <linux/module.h>
  19
  20 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  22 MODULE_LICENSE("GPL v2");
  23
  24 struct sha1_ce_state {
  25         struct sha1_state       sst;
  26         u32                     finalize;
  27 };
  28
  29 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  30                                   int blocks);
  31 #ifdef CONFIG_CFI_CLANG
  32 static inline void __cfi_sha1_ce_transform(struct sha1_state *sst,
  33                                            u8 const *src, int blocks)
  34 {
  35         sha1_ce_transform((struct sha1_ce_state *)sst, src, blocks);
  36 }
  37 #define sha1_ce_transform __cfi_sha1_ce_transform
  38 #endif
  39
  40 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  41 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  42
  43 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  44 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  45
  46 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  47                           unsigned int len)
  48 {
  49         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  50
  51         sctx->finalize = 0;
  52         kernel_neon_begin_partial(16);
  53         sha1_base_do_update(desc, data, len,
  54                             (sha1_block_fn *)sha1_ce_transform);
  55         kernel_neon_end();
  56
  57         return 0;
  58 }
  59
  60 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  61                          unsigned int len, u8 *out)
  62 {
  63         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  64         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  65
  66         /*
  67          * Allow the asm code to perform the finalization if there is no
  68          * partial data and the input is a round multiple of the block size.
  69          */
  70         sctx->finalize = finalize;
  71
  72         kernel_neon_begin_partial(16);
  73         sha1_base_do_update(desc, data, len,
  74                             (sha1_block_fn *)sha1_ce_transform);
  75         if (!finalize)
  76                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  77         kernel_neon_end();
  78         return sha1_base_finish(desc, out);
  79 }
  80
  81 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  82 {
  83         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  84
  85         sctx->finalize = 0;
  86         kernel_neon_begin_partial(16);
  87         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  88         kernel_neon_end();
  89         return sha1_base_finish(desc, out);
  90 }
  91
  92 static struct shash_alg alg = {
  93         .init                   = sha1_base_init,
  94         .update                 = sha1_ce_update,
  95         .final                  = sha1_ce_final,
  96         .finup                  = sha1_ce_finup,
  97         .descsize               = sizeof(struct sha1_ce_state),
  98         .digestsize             = SHA1_DIGEST_SIZE,
  99         .base                   = {
 100                 .cra_name               = "sha1",
 101                 .cra_driver_name        = "sha1-ce",
 102                 .cra_priority           = 200,
 103                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 104                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 105                 .cra_module             = THIS_MODULE,
 106         }
 107 };
 108
 109 static int __init sha1_ce_mod_init(void)
 110 {
 111         return crypto_register_shash(&alg);
 112 }
 113
 114 static void __exit sha1_ce_mod_fini(void)
 115 {
 116         crypto_unregister_shash(&alg);
 117 }
 118
 119 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 120 module_exit(sha1_ce_mod_fini);