kernel/arch/arm/crypto/sha1-ce-glue.c

   1 /*
   2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   3  *
   4  * Copyright (C) 2015 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 <crypto/internal/hash.h>
  12 #include <crypto/sha.h>
  13 #include <crypto/sha1_base.h>
  14 #include <linux/crypto.h>
  15 #include <linux/module.h>
  16
  17 #include <asm/hwcap.h>
  18 #include <asm/neon.h>
  19 #include <asm/simd.h>
  20
  21 #include "sha1.h"
  22
  23 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  25 MODULE_LICENSE("GPL v2");
  26
  27 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  28                                   int blocks);
  29
  30 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  31                           unsigned int len)
  32 {
  33         struct sha1_state *sctx = shash_desc_ctx(desc);
  34
  35         if (!may_use_simd() ||
  36             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  37                 return sha1_update_arm(desc, data, len);
  38
  39         kernel_neon_begin();
  40         sha1_base_do_update(desc, data, len, sha1_ce_transform);
  41         kernel_neon_end();
  42
  43         return 0;
  44 }
  45
  46 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  47                          unsigned int len, u8 *out)
  48 {
  49         if (!may_use_simd())
  50                 return sha1_finup_arm(desc, data, len, out);
  51
  52         kernel_neon_begin();
  53         if (len)
  54                 sha1_base_do_update(desc, data, len, sha1_ce_transform);
  55         sha1_base_do_finalize(desc, sha1_ce_transform);
  56         kernel_neon_end();
  57
  58         return sha1_base_finish(desc, out);
  59 }
  60
  61 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  62 {
  63         return sha1_ce_finup(desc, NULL, 0, out);
  64 }
  65
  66 static struct shash_alg alg = {
  67         .init                   = sha1_base_init,
  68         .update                 = sha1_ce_update,
  69         .final                  = sha1_ce_final,
  70         .finup                  = sha1_ce_finup,
  71         .descsize               = sizeof(struct sha1_state),
  72         .digestsize             = SHA1_DIGEST_SIZE,
  73         .base                   = {
  74                 .cra_name               = "sha1",
  75                 .cra_driver_name        = "sha1-ce",
  76                 .cra_priority           = 200,
  77                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  78                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  79                 .cra_module             = THIS_MODULE,
  80         }
  81 };
  82
  83 static int __init sha1_ce_mod_init(void)
  84 {
  85         if (!(elf_hwcap2 & HWCAP2_SHA1))
  86                 return -ENODEV;
  87         return crypto_register_shash(&alg);
  88 }
  89
  90 static void __exit sha1_ce_mod_fini(void)
  91 {
  92         crypto_unregister_shash(&alg);
  93 }
  94
  95 module_init(sha1_ce_mod_init);
  96 module_exit(sha1_ce_mod_fini);