arch/s390/crypto/sha256_s390.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
   5  *
   6  * s390 Version:
   7  *   Copyright IBM Corp. 2005, 2011
   8  *   Author(s): Jan Glauber (jang@de.ibm.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  */
  16 #include <crypto/internal/hash.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <crypto/sha.h>
  20
  21 #include "crypt_s390.h"
  22 #include "sha.h"
  23
  24 static int sha256_init(struct shash_desc *desc)
  25 {
  26         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  27
  28         sctx->state[0] = SHA256_H0;
  29         sctx->state[1] = SHA256_H1;
  30         sctx->state[2] = SHA256_H2;
  31         sctx->state[3] = SHA256_H3;
  32         sctx->state[4] = SHA256_H4;
  33         sctx->state[5] = SHA256_H5;
  34         sctx->state[6] = SHA256_H6;
  35         sctx->state[7] = SHA256_H7;
  36         sctx->count = 0;
  37         sctx->func = KIMD_SHA_256;
  38
  39         return 0;
  40 }
  41
  42 static int sha256_export(struct shash_desc *desc, void *out)
  43 {
  44         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  45         struct sha256_state *octx = out;
  46
  47         octx->count = sctx->count;
  48         memcpy(octx->state, sctx->state, sizeof(octx->state));
  49         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  50         return 0;
  51 }
  52
  53 static int sha256_import(struct shash_desc *desc, const void *in)
  54 {
  55         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  56         const struct sha256_state *ictx = in;
  57
  58         sctx->count = ictx->count;
  59         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  60         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  61         sctx->func = KIMD_SHA_256;
  62         return 0;
  63 }
  64
  65 static struct shash_alg sha256_alg = {
  66         .digestsize     =       SHA256_DIGEST_SIZE,
  67         .init           =       sha256_init,
  68         .update         =       s390_sha_update,
  69         .final          =       s390_sha_final,
  70         .export         =       sha256_export,
  71         .import         =       sha256_import,
  72         .descsize       =       sizeof(struct s390_sha_ctx),
  73         .statesize      =       sizeof(struct sha256_state),
  74         .base           =       {
  75                 .cra_name       =       "sha256",
  76                 .cra_driver_name=       "sha256-s390",
  77                 .cra_priority   =       CRYPT_S390_PRIORITY,
  78                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  79                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  80                 .cra_module     =       THIS_MODULE,
  81         }
  82 };
  83
  84 static int sha224_init(struct shash_desc *desc)
  85 {
  86         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  87
  88         sctx->state[0] = SHA224_H0;
  89         sctx->state[1] = SHA224_H1;
  90         sctx->state[2] = SHA224_H2;
  91         sctx->state[3] = SHA224_H3;
  92         sctx->state[4] = SHA224_H4;
  93         sctx->state[5] = SHA224_H5;
  94         sctx->state[6] = SHA224_H6;
  95         sctx->state[7] = SHA224_H7;
  96         sctx->count = 0;
  97         sctx->func = KIMD_SHA_256;
  98
  99         return 0;
 100 }
 101
 102 static struct shash_alg sha224_alg = {
 103         .digestsize     =       SHA224_DIGEST_SIZE,
 104         .init           =       sha224_init,
 105         .update         =       s390_sha_update,
 106         .final          =       s390_sha_final,
 107         .export         =       sha256_export,
 108         .import         =       sha256_import,
 109         .descsize       =       sizeof(struct s390_sha_ctx),
 110         .statesize      =       sizeof(struct sha256_state),
 111         .base           =       {
 112                 .cra_name       =       "sha224",
 113                 .cra_driver_name=       "sha224-s390",
 114                 .cra_priority   =       CRYPT_S390_PRIORITY,
 115                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 116                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 117                 .cra_module     =       THIS_MODULE,
 118         }
 119 };
 120
 121 static int __init sha256_s390_init(void)
 122 {
 123         int ret;
 124
 125         if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA))
 126                 return -EOPNOTSUPP;
 127         ret = crypto_register_shash(&sha256_alg);
 128         if (ret < 0)
 129                 goto out;
 130         ret = crypto_register_shash(&sha224_alg);
 131         if (ret < 0)
 132                 crypto_unregister_shash(&sha256_alg);
 133 out:
 134         return ret;
 135 }
 136
 137 static void __exit sha256_s390_fini(void)
 138 {
 139         crypto_unregister_shash(&sha224_alg);
 140         crypto_unregister_shash(&sha256_alg);
 141 }
 142
 143 module_init(sha256_s390_init);
 144 module_exit(sha256_s390_fini);
 145
 146 MODULE_ALIAS_CRYPTO("sha256");
 147 MODULE_ALIAS_CRYPTO("sha224");
 148 MODULE_LICENSE("GPL");
 149 MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");