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 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/sha256_base.h>
  16 #include <linux/cpufeature.h>
  17 #include <linux/crypto.h>
  18 #include <linux/module.h>
  19
  20 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  22 MODULE_LICENSE("GPL v2");
  23
  24 struct sha256_ce_state {
  25         struct sha256_state     sst;
  26         u32                     finalize;
  27 };
  28
  29 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  30                                   int blocks);
  31
  32 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  33                                               sst.count);
  34 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  35                                                  finalize);
  36
  37 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  38                             unsigned int len)
  39 {
  40         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  41
  42         sctx->finalize = 0;
  43         kernel_neon_begin_partial(28);
  44         sha256_base_do_update(desc, data, len,
  45                               (sha256_block_fn *)sha2_ce_transform);
  46         kernel_neon_end();
  47
  48         return 0;
  49 }
  50
  51 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  52                            unsigned int len, u8 *out)
  53 {
  54         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  55         bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
  56
  57         /*
  58          * Allow the asm code to perform the finalization if there is no
  59          * partial data and the input is a round multiple of the block size.
  60          */
  61         sctx->finalize = finalize;
  62
  63         kernel_neon_begin_partial(28);
  64         sha256_base_do_update(desc, data, len,
  65                               (sha256_block_fn *)sha2_ce_transform);
  66         if (!finalize)
  67                 sha256_base_do_finalize(desc,
  68                                         (sha256_block_fn *)sha2_ce_transform);
  69         kernel_neon_end();
  70         return sha256_base_finish(desc, out);
  71 }
  72
  73 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
  74 {
  75         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  76
  77         sctx->finalize = 0;
  78         kernel_neon_begin_partial(28);
  79         sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
  80         kernel_neon_end();
  81         return sha256_base_finish(desc, out);
  82 }
  83
  84 static struct shash_alg algs[] = { {
  85         .init                   = sha224_base_init,
  86         .update                 = sha256_ce_update,
  87         .final                  = sha256_ce_final,
  88         .finup                  = sha256_ce_finup,
  89         .descsize               = sizeof(struct sha256_ce_state),
  90         .digestsize             = SHA224_DIGEST_SIZE,
  91         .base                   = {
  92                 .cra_name               = "sha224",
  93                 .cra_driver_name        = "sha224-ce",
  94                 .cra_priority           = 200,
  95                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  96                 .cra_blocksize          = SHA256_BLOCK_SIZE,
  97                 .cra_module             = THIS_MODULE,
  98         }
  99 }, {
 100         .init                   = sha256_base_init,
 101         .update                 = sha256_ce_update,
 102         .final                  = sha256_ce_final,
 103         .finup                  = sha256_ce_finup,
 104         .descsize               = sizeof(struct sha256_ce_state),
 105         .digestsize             = SHA256_DIGEST_SIZE,
 106         .base                   = {
 107                 .cra_name               = "sha256",
 108                 .cra_driver_name        = "sha256-ce",
 109                 .cra_priority           = 200,
 110                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 111                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 112                 .cra_module             = THIS_MODULE,
 113         }
 114 } };
 115
 116 static int __init sha2_ce_mod_init(void)
 117 {
 118         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 119 }
 120
 121 static void __exit sha2_ce_mod_fini(void)
 122 {
 123         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 124 }
 125
 126 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 127 module_exit(sha2_ce_mod_fini);