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

   1 /*
   2  * sha2-ce-glue.c - SHA-224/SHA-256 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/internal/simd.h>
  13 #include <crypto/sha.h>
  14 #include <crypto/sha256_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/hwcap.h>
  20 #include <asm/simd.h>
  21 #include <asm/neon.h>
  22 #include <asm/unaligned.h>
  23
  24 #include "sha256_glue.h"
  25
  26 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  27 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  28 MODULE_LICENSE("GPL v2");
  29
  30 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
  31                                   int blocks);
  32
  33 static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
  34                           unsigned int len)
  35 {
  36         struct sha256_state *sctx = shash_desc_ctx(desc);
  37
  38         if (!crypto_simd_usable() ||
  39             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
  40                 return crypto_sha256_arm_update(desc, data, len);
  41
  42         kernel_neon_begin();
  43         sha256_base_do_update(desc, data, len,
  44                               (sha256_block_fn *)sha2_ce_transform);
  45         kernel_neon_end();
  46
  47         return 0;
  48 }
  49
  50 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
  51                          unsigned int len, u8 *out)
  52 {
  53         if (!crypto_simd_usable())
  54                 return crypto_sha256_arm_finup(desc, data, len, out);
  55
  56         kernel_neon_begin();
  57         if (len)
  58                 sha256_base_do_update(desc, data, len,
  59                                       (sha256_block_fn *)sha2_ce_transform);
  60         sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
  61         kernel_neon_end();
  62
  63         return sha256_base_finish(desc, out);
  64 }
  65
  66 static int sha2_ce_final(struct shash_desc *desc, u8 *out)
  67 {
  68         return sha2_ce_finup(desc, NULL, 0, out);
  69 }
  70
  71 static struct shash_alg algs[] = { {
  72         .init                   = sha224_base_init,
  73         .update                 = sha2_ce_update,
  74         .final                  = sha2_ce_final,
  75         .finup                  = sha2_ce_finup,
  76         .descsize               = sizeof(struct sha256_state),
  77         .digestsize             = SHA224_DIGEST_SIZE,
  78         .base                   = {
  79                 .cra_name               = "sha224",
  80                 .cra_driver_name        = "sha224-ce",
  81                 .cra_priority           = 300,
  82                 .cra_blocksize          = SHA256_BLOCK_SIZE,
  83                 .cra_module             = THIS_MODULE,
  84         }
  85 }, {
  86         .init                   = sha256_base_init,
  87         .update                 = sha2_ce_update,
  88         .final                  = sha2_ce_final,
  89         .finup                  = sha2_ce_finup,
  90         .descsize               = sizeof(struct sha256_state),
  91         .digestsize             = SHA256_DIGEST_SIZE,
  92         .base                   = {
  93                 .cra_name               = "sha256",
  94                 .cra_driver_name        = "sha256-ce",
  95                 .cra_priority           = 300,
  96                 .cra_blocksize          = SHA256_BLOCK_SIZE,
  97                 .cra_module             = THIS_MODULE,
  98         }
  99 } };
 100
 101 static int __init sha2_ce_mod_init(void)
 102 {
 103         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 104 }
 105
 106 static void __exit sha2_ce_mod_fini(void)
 107 {
 108         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 109 }
 110
 111 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 112 module_exit(sha2_ce_mod_fini);