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

  /*
   * Cryptographic API.
   *

   * s390 implementation of the SHA1 Secure Hash Algorithm.

   *
   * Derived from cryptoapi implementation, adapted for in-place
   * scatterlist interface.  Originally based on the public domain
   * implementation written by Steve Reid.
   *
   * s390 Version:

   *   Copyright IBM Corp. 2003, 2007

   *   Author(s): Thomas Spatzier
   *		Jan Glauber (jan.glauber@de.ibm.com)

   *

   * Derived from "crypto/sha1_generic.c"

   *   Copyright (c) Alan Smithee.
   *   Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   *   Copyright (c) Jean-Francois Dive <jef@linuxbe.org>

   */

  #include <crypto/internal/hash.h>

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

  #include <linux/cpufeature.h>

  #include <crypto/sha.h>

  #include <asm/cpacf.h>

  #include "sha.h"

  static int s390_sha1_init(struct shash_desc *desc)

  {

  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

  	sctx->state[0] = SHA1_H0;
  	sctx->state[1] = SHA1_H1;
  	sctx->state[2] = SHA1_H2;
  	sctx->state[3] = SHA1_H3;
  	sctx->state[4] = SHA1_H4;

  	sctx->count = 0;

  	sctx->func = CPACF_KIMD_SHA_1;

  
  	return 0;

  }

  static int s390_sha1_export(struct shash_desc *desc, void *out)

  {
  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  	struct sha1_state *octx = out;
  
  	octx->count = sctx->count;
  	memcpy(octx->state, sctx->state, sizeof(octx->state));
  	memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
  	return 0;
  }

  static int s390_sha1_import(struct shash_desc *desc, const void *in)

  {

  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

  	const struct sha1_state *ictx = in;

  
  	sctx->count = ictx->count;
  	memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  	memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));

  	sctx->func = CPACF_KIMD_SHA_1;

  	return 0;
  }

  static struct shash_alg alg = {
  	.digestsize	=	SHA1_DIGEST_SIZE,

  	.init		=	s390_sha1_init,

  	.update		=	s390_sha_update,
  	.final		=	s390_sha_final,

  	.export		=	s390_sha1_export,
  	.import		=	s390_sha1_import,

  	.descsize	=	sizeof(struct s390_sha_ctx),

  	.statesize	=	sizeof(struct sha1_state),

  	.base		=	{
  		.cra_name	=	"sha1",
  		.cra_driver_name=	"sha1-s390",

  		.cra_priority	=	300,

  		.cra_blocksize	=	SHA1_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}

  };

  static int __init sha1_s390_init(void)

  {

  	if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))

  		return -ENODEV;

  	return crypto_register_shash(&alg);

  }

  static void __exit sha1_s390_fini(void)

  {

  	crypto_unregister_shash(&alg);

  }

  module_cpu_feature_match(MSA, sha1_s390_init);

  module_exit(sha1_s390_fini);

  MODULE_ALIAS_CRYPTO("sha1");

  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");