LXR linux/arch/arm/crypto/sha512-neon-glue.c

   1/*
   2 * sha512-neon-glue.c - accelerated SHA-384/512 for ARM NEON
   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/sha512_base.h>
  14#include <linux/crypto.h>
  15#include <linux/module.h>
  16
  17#include <asm/simd.h>
  18#include <asm/neon.h>
  19
  20#include "sha512.h"
  21
  22MODULE_ALIAS_CRYPTO("sha384-neon");
  23MODULE_ALIAS_CRYPTO("sha512-neon");
  24
  25asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
  26                                             int blocks);
  27
  28static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
  29                              unsigned int len)
  30{
  31        struct sha512_state *sctx = shash_desc_ctx(desc);
  32
  33        if (!may_use_simd() ||
  34            (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
  35                return sha512_arm_update(desc, data, len);
  36
  37        kernel_neon_begin();
  38        sha512_base_do_update(desc, data, len,
  39                (sha512_block_fn *)sha512_block_data_order_neon);
  40        kernel_neon_end();
  41
  42        return 0;
  43}
  44
  45static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
  46                             unsigned int len, u8 *out)
  47{
  48        if (!may_use_simd())
  49                return sha512_arm_finup(desc, data, len, out);
  50
  51        kernel_neon_begin();
  52        if (len)
  53                sha512_base_do_update(desc, data, len,
  54                        (sha512_block_fn *)sha512_block_data_order_neon);
  55        sha512_base_do_finalize(desc,
  56                (sha512_block_fn *)sha512_block_data_order_neon);
  57        kernel_neon_end();
  58
  59        return sha512_base_finish(desc, out);
  60}
  61
  62static int sha512_neon_final(struct shash_desc *desc, u8 *out)
  63{
  64        return sha512_neon_finup(desc, NULL, 0, out);
  65}
  66
  67struct shash_alg sha512_neon_algs[] = { {
  68        .init                   = sha384_base_init,
  69        .update                 = sha512_neon_update,
  70        .final                  = sha512_neon_final,
  71        .finup                  = sha512_neon_finup,
  72        .descsize               = sizeof(struct sha512_state),
  73        .digestsize             = SHA384_DIGEST_SIZE,
  74        .base                   = {
  75                .cra_name               = "sha384",
  76                .cra_driver_name        = "sha384-neon",
  77                .cra_priority           = 300,
  78                .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  79                .cra_blocksize          = SHA384_BLOCK_SIZE,
  80                .cra_module             = THIS_MODULE,
  81
  82        }
  83},  {
  84        .init                   = sha512_base_init,
  85        .update                 = sha512_neon_update,
  86        .final                  = sha512_neon_final,
  87        .finup                  = sha512_neon_finup,
  88        .descsize               = sizeof(struct sha512_state),
  89        .digestsize             = SHA512_DIGEST_SIZE,
  90        .base                   = {
  91                .cra_name               = "sha512",
  92                .cra_driver_name        = "sha512-neon",
  93                .cra_priority           = 300,
  94                .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  95                .cra_blocksize          = SHA512_BLOCK_SIZE,
  96                .cra_module             = THIS_MODULE,
  97        }
  98} };
  99