text: /*
   * Cryptographic API.
   *
   * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
   *
   * s390 Version:
   *   Copyright IBM Corp. 2005, 2011
   *   Author(s): Jan Glauber (jang@de.ibm.com)
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 2 of the License, or (at your option)
   * any later version.
   *
   */
  #include <crypto/internal/hash.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <crypto/sha.h>
  
  #include "crypt_s390.h"
  #include "sha.h"
  
  static int sha256_init(struct shash_desc *desc)
  {
  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  
  	sctx->state[0] = SHA256_H0;
  	sctx->state[1] = SHA256_H1;
  	sctx->state[2] = SHA256_H2;
  	sctx->state[3] = SHA256_H3;
  	sctx->state[4] = SHA256_H4;
  	sctx->state[5] = SHA256_H5;
  	sctx->state[6] = SHA256_H6;
  	sctx->state[7] = SHA256_H7;
  	sctx->count = 0;
  	sctx->func = KIMD_SHA_256;
  
  	return 0;
  }
  
  static int sha256_export(struct shash_desc *desc, void *out)
  {
  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  	struct sha256_state *octx = out;
  
  	octx->count = sctx->count;
  	memcpy(octx->state, sctx->state, sizeof(octx->state));
  	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  	return 0;
  }
  
  static int sha256_import(struct shash_desc *desc, const void *in)
  {
  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  	const struct sha256_state *ictx = in;
  
  	sctx->count = ictx->count;
  	memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  	sctx->func = KIMD_SHA_256;
  	return 0;
  }
  
  static struct shash_alg sha256_alg = {
  	.digestsize	=	SHA256_DIGEST_SIZE,
  	.init		=	sha256_init,
  	.update		=	s390_sha_update,
  	.final		=	s390_sha_final,
  	.export		=	sha256_export,
  	.import		=	sha256_import,
  	.descsize	=	sizeof(struct s390_sha_ctx),
  	.statesize	=	sizeof(struct sha256_state),
  	.base		=	{
  		.cra_name	=	"sha256",
  		.cra_driver_name=	"sha256-s390",
  		.cra_priority	=	CRYPT_S390_PRIORITY,
  		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
  		.cra_blocksize	=	SHA256_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}
  };
  
  static int sha224_init(struct shash_desc *desc)
  {
  	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  
  	sctx->state[0] = SHA224_H0;
  	sctx->state[1] = SHA224_H1;
  	sctx->state[2] = SHA224_H2;
  	sctx->state[3] = SHA224_H3;
  	sctx->state[4] = SHA224_H4;
  	sctx->state[5] = SHA224_H5;
  	sctx->state[6] = SHA224_H6;
  	sctx->state[7] = SHA224_H7;
  	sctx->count = 0;
  	sctx->func = KIMD_SHA_256;
  
  	return 0;
  }
  
  static struct shash_alg sha224_alg = {
  	.digestsize	=	SHA224_DIGEST_SIZE,
  	.init		=	sha224_init,
  	.update		=	s390_sha_update,
  	.final		=	s390_sha_final,
  	.export		=	sha256_export,
  	.import		=	sha256_import,
  	.descsize	=	sizeof(struct s390_sha_ctx),
  	.statesize	=	sizeof(struct sha256_state),
  	.base		=	{
  		.cra_name	=	"sha224",
  		.cra_driver_name=	"sha224-s390",
  		.cra_priority	=	CRYPT_S390_PRIORITY,
  		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
  		.cra_blocksize	=	SHA224_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}
  };
  
  static int __init sha256_s390_init(void)
  {
  	int ret;
  
  	if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA))
  		return -EOPNOTSUPP;
  	ret = crypto_register_shash(&sha256_alg);
  	if (ret < 0)
  		goto out;
  	ret = crypto_register_shash(&sha224_alg);
  	if (ret < 0)
  		crypto_unregister_shash(&sha256_alg);
  out:
  	return ret;
  }
  
  static void __exit sha256_s390_fini(void)
  {
  	crypto_unregister_shash(&sha224_alg);
  	crypto_unregister_shash(&sha256_alg);
  }
  
  module_init(sha256_s390_init);
  module_exit(sha256_s390_fini);
  
  MODULE_ALIAS_CRYPTO("sha256");
  MODULE_ALIAS_CRYPTO("sha224");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
  