linux/arch/s390/crypto/sha256_s390.c
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   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 <linux/init.h>
  20#include <linux/module.h>
  21#include <linux/crypto.h>
  22#include <crypto/sha.h>
  23
  24#include "crypt_s390.h"
  25#include "sha.h"
  26
  27static void sha256_init(struct crypto_tfm *tfm)
  28{
  29        struct s390_sha_ctx *sctx = crypto_tfm_ctx(tfm);
  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
  43static struct crypto_alg alg = {
  44        .cra_name       =       "sha256",
  45        .cra_driver_name =      "sha256-s390",
  46        .cra_priority   =       CRYPT_S390_PRIORITY,
  47        .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
  48        .cra_blocksize  =       SHA256_BLOCK_SIZE,
  49        .cra_ctxsize    =       sizeof(struct s390_sha_ctx),
  50        .cra_module     =       THIS_MODULE,
  51        .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
  52        .cra_u          =       { .digest = {
  53        .dia_digestsize =       SHA256_DIGEST_SIZE,
  54        .dia_init       =       sha256_init,
  55        .dia_update     =       s390_sha_update,
  56        .dia_final      =       s390_sha_final } }
  57};
  58
  59static int sha256_s390_init(void)
  60{
  61        if (!crypt_s390_func_available(KIMD_SHA_256))
  62                return -EOPNOTSUPP;
  63
  64        return crypto_register_alg(&alg);
  65}
  66
  67static void __exit sha256_s390_fini(void)
  68{
  69        crypto_unregister_alg(&alg);
  70}
  71
  72module_init(sha256_s390_init);
  73module_exit(sha256_s390_fini);
  74
  75MODULE_ALIAS("sha256");
  76MODULE_LICENSE("GPL");
  77MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
  78