LXR linux/arch/s390/crypto/sha256

   1/*
   2 * Cryptographic API.
   3 *
   4 * s390 implementation of the SHA256 Secure Hash Algorithm.
   5 *
   6 * s390 Version:
   7 *   Copyright IBM Corp. 2005,2007
   8 *   Author(s): Jan Glauber (jang@de.ibm.com)
   9 *
  10 * Derived from "crypto/sha256_generic.c"
  11 * and "arch/s390/crypto/sha1_s390.c"
  12 *
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of the GNU General Public License as published by the Free
  15 * Software Foundation; either version 2 of the License, or (at your option)
  16 * any later version.
  17 *
  18 */
  19#include <crypto/internal/hash.h>
  20#include <linux/init.h>
  21#include <linux/module.h>
  22#include <crypto/sha.h>
  23
  24#include "crypt_s390.h"
  25#include "sha.h"
  26
  27static int sha256_init(struct shash_desc *desc)
  28{
  29        struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  30
  31        sctx->state[0] = SHA256_H0;
  32        sctx->state[1] = SHA256_H1;
  33        sctx->state[2] = SHA256_H2;
  34        sctx->state[3] = SHA256_H3;
  35        sctx->state[4] = SHA256_H4;
  36        sctx->state[5] = SHA256_H5;
  37        sctx->state[6] = SHA256_H6;
  38        sctx->state[7] = SHA256_H7;
  39        sctx->count = 0;
  40        sctx->func = KIMD_SHA_256;
  41
  42        return 0;
  43}
  44
  45static struct shash_alg alg = {
  46        .digestsize     =       SHA256_DIGEST_SIZE,
  47        .init           =       sha256_init,
  48        .update         =       s390_sha_update,
  49        .final          =       s390_sha_final,
  50        .descsize       =       sizeof(struct s390_sha_ctx),
  51        .base           =       {
  52                .cra_name       =       "sha256",
  53                .cra_driver_name=       "sha256-s390",
  54                .cra_priority   =       CRYPT_S390_PRIORITY,
  55                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  56                .cra_blocksize  =       SHA256_BLOCK_SIZE,
  57                .cra_module     =       THIS_MODULE,
  58        }
  59};
  60
  61static int sha256_s390_init(void)
  62{
  63        if (!crypt_s390_func_available(KIMD_SHA_256))
  64                return -EOPNOTSUPP;
  65
  66        return crypto_register_shash(&alg);
  67}
  68
  69static void __exit sha256_s390_fini(void)
  70{
  71        crypto_unregister_shash(&alg);
  72}
  73
  74module_init(sha256_s390_init);
  75module_exit(sha256_s390_fini);
  76
  77MODULE_ALIAS("sha256");
  78MODULE_LICENSE("GPL");
  79MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
  80