// SPDX-License-Identifier: GPL-2.0-only

  /*
   * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   *
   * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>

   */
  
  #include <crypto/internal/hash.h>

  #include <crypto/internal/simd.h>

  #include <crypto/sha.h>

  #include <crypto/sha1_base.h>

  #include <linux/cpufeature.h>

  #include <linux/crypto.h>
  #include <linux/module.h>

  #include <asm/hwcap.h>
  #include <asm/neon.h>
  #include <asm/simd.h>

  #include "sha1.h"

  MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  MODULE_LICENSE("GPL v2");

  asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  				  int blocks);

  static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  			  unsigned int len)

  {
  	struct sha1_state *sctx = shash_desc_ctx(desc);

  	if (!crypto_simd_usable() ||

  	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)

  		return sha1_update_arm(desc, data, len);

  	kernel_neon_begin();
  	sha1_base_do_update(desc, data, len, sha1_ce_transform);
  	kernel_neon_end();

  	return 0;
  }

  static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  			 unsigned int len, u8 *out)

  {

  	if (!crypto_simd_usable())

  		return sha1_finup_arm(desc, data, len, out);

  	kernel_neon_begin();
  	if (len)
  		sha1_base_do_update(desc, data, len, sha1_ce_transform);
  	sha1_base_do_finalize(desc, sha1_ce_transform);
  	kernel_neon_end();

  	return sha1_base_finish(desc, out);

  }

  static int sha1_ce_final(struct shash_desc *desc, u8 *out)

  {

  	return sha1_ce_finup(desc, NULL, 0, out);

  }
  
  static struct shash_alg alg = {

  	.init			= sha1_base_init,
  	.update			= sha1_ce_update,
  	.final			= sha1_ce_final,
  	.finup			= sha1_ce_finup,

  	.descsize		= sizeof(struct sha1_state),
  	.digestsize		= SHA1_DIGEST_SIZE,

  	.base			= {
  		.cra_name		= "sha1",
  		.cra_driver_name	= "sha1-ce",
  		.cra_priority		= 200,

  		.cra_blocksize		= SHA1_BLOCK_SIZE,
  		.cra_module		= THIS_MODULE,
  	}
  };
  
  static int __init sha1_ce_mod_init(void)
  {

  	return crypto_register_shash(&alg);
  }
  
  static void __exit sha1_ce_mod_fini(void)
  {
  	crypto_unregister_shash(&alg);
  }

  module_cpu_feature_match(SHA1, sha1_ce_mod_init);

  module_exit(sha1_ce_mod_fini);