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 <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
  27 static 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
  45 static int sha256_export(struct shash_desc *desc, void *out)
  46 {
  47         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  48         struct sha256_state *octx = out;
  49
  50         octx->count = sctx->count;
  51         memcpy(octx->state, sctx->state, sizeof(octx->state));
  52         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  53         return 0;
  54 }
  55
  56 static int sha256_import(struct shash_desc *desc, const void *in)
  57 {
  58         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  59         const struct sha256_state *ictx = in;
  60
  61         sctx->count = ictx->count;
  62         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  63         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  64         sctx->func = KIMD_SHA_256;
  65         return 0;
  66 }
  67
  68 static struct shash_alg alg = {
  69         .digestsize     =       SHA256_DIGEST_SIZE,
  70         .init           =       sha256_init,
  71         .update         =       s390_sha_update,
  72         .final          =       s390_sha_final,
  73         .export         =       sha256_export,
  74         .import         =       sha256_import,
  75         .descsize       =       sizeof(struct s390_sha_ctx),
  76         .statesize      =       sizeof(struct sha256_state),
  77         .base           =       {
  78                 .cra_name       =       "sha256",
  79                 .cra_driver_name=       "sha256-s390",
  80                 .cra_priority   =       CRYPT_S390_PRIORITY,
  81                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  82                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  83                 .cra_module     =       THIS_MODULE,
  84         }
  85 };
  86
  87 static int sha256_s390_init(void)
  88 {
  89         if (!crypt_s390_func_available(KIMD_SHA_256))
  90                 return -EOPNOTSUPP;
  91
  92         return crypto_register_shash(&alg);
  93 }
  94
  95 static void __exit sha256_s390_fini(void)
  96 {
  97         crypto_unregister_shash(&alg);
  98 }
  99
 100 module_init(sha256_s390_init);
 101 module_exit(sha256_s390_fini);
 102
 103 MODULE_ALIAS("sha256");
 104 MODULE_LICENSE("GPL");
 105 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");