arch/s390/crypto/sha256_s390.c

   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
  27 static 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
  43 static 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
  59 static 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
  67 static void __exit sha256_s390_fini(void)
  68 {
  69         crypto_unregister_alg(&alg);
  70 }
  71
  72 module_init(sha256_s390_init);
  73 module_exit(sha256_s390_fini);
  74
  75 MODULE_ALIAS("sha256");
  76 MODULE_LICENSE("GPL");
  77 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");