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 <linux/cpufeature.h>
  20 #include <crypto/sha.h>
  21 #include <asm/cpacf.h>
  22
  23 #include "sha.h"
  24
  25 static int sha256_init(struct shash_desc *desc)
  26 {
  27         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  28
  29         sctx->state[0] = SHA256_H0;
  30         sctx->state[1] = SHA256_H1;
  31         sctx->state[2] = SHA256_H2;
  32         sctx->state[3] = SHA256_H3;
  33         sctx->state[4] = SHA256_H4;
  34         sctx->state[5] = SHA256_H5;
  35         sctx->state[6] = SHA256_H6;
  36         sctx->state[7] = SHA256_H7;
  37         sctx->count = 0;
  38         sctx->func = CPACF_KIMD_SHA_256;
  39
  40         return 0;
  41 }
  42
  43 static int sha256_export(struct shash_desc *desc, void *out)
  44 {
  45         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  46         struct sha256_state *octx = out;
  47
  48         octx->count = sctx->count;
  49         memcpy(octx->state, sctx->state, sizeof(octx->state));
  50         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  51         return 0;
  52 }
  53
  54 static int sha256_import(struct shash_desc *desc, const void *in)
  55 {
  56         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  57         const struct sha256_state *ictx = in;
  58
  59         sctx->count = ictx->count;
  60         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  61         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  62         sctx->func = CPACF_KIMD_SHA_256;
  63         return 0;
  64 }
  65
  66 static struct shash_alg sha256_alg = {
  67         .digestsize     =       SHA256_DIGEST_SIZE,
  68         .init           =       sha256_init,
  69         .update         =       s390_sha_update,
  70         .final          =       s390_sha_final,
  71         .export         =       sha256_export,
  72         .import         =       sha256_import,
  73         .descsize       =       sizeof(struct s390_sha_ctx),
  74         .statesize      =       sizeof(struct sha256_state),
  75         .base           =       {
  76                 .cra_name       =       "sha256",
  77                 .cra_driver_name=       "sha256-s390",
  78                 .cra_priority   =       300,
  79                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  80                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  81                 .cra_module     =       THIS_MODULE,
  82         }
  83 };
  84
  85 static int sha224_init(struct shash_desc *desc)
  86 {
  87         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  88
  89         sctx->state[0] = SHA224_H0;
  90         sctx->state[1] = SHA224_H1;
  91         sctx->state[2] = SHA224_H2;
  92         sctx->state[3] = SHA224_H3;
  93         sctx->state[4] = SHA224_H4;
  94         sctx->state[5] = SHA224_H5;
  95         sctx->state[6] = SHA224_H6;
  96         sctx->state[7] = SHA224_H7;
  97         sctx->count = 0;
  98         sctx->func = CPACF_KIMD_SHA_256;
  99
 100         return 0;
 101 }
 102
 103 static struct shash_alg sha224_alg = {
 104         .digestsize     =       SHA224_DIGEST_SIZE,
 105         .init           =       sha224_init,
 106         .update         =       s390_sha_update,
 107         .final          =       s390_sha_final,
 108         .export         =       sha256_export,
 109         .import         =       sha256_import,
 110         .descsize       =       sizeof(struct s390_sha_ctx),
 111         .statesize      =       sizeof(struct sha256_state),
 112         .base           =       {
 113                 .cra_name       =       "sha224",
 114                 .cra_driver_name=       "sha224-s390",
 115                 .cra_priority   =       300,
 116                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 117                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 118                 .cra_module     =       THIS_MODULE,
 119         }
 120 };
 121
 122 static int __init sha256_s390_init(void)
 123 {
 124         int ret;
 125
 126         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
 127                 return -EOPNOTSUPP;
 128         ret = crypto_register_shash(&sha256_alg);
 129         if (ret < 0)
 130                 goto out;
 131         ret = crypto_register_shash(&sha224_alg);
 132         if (ret < 0)
 133                 crypto_unregister_shash(&sha256_alg);
 134 out:
 135         return ret;
 136 }
 137
 138 static void __exit sha256_s390_fini(void)
 139 {
 140         crypto_unregister_shash(&sha224_alg);
 141         crypto_unregister_shash(&sha256_alg);
 142 }
 143
 144 module_cpu_feature_match(MSA, sha256_s390_init);
 145 module_exit(sha256_s390_fini);
 146
 147 MODULE_ALIAS_CRYPTO("sha256");
 148 MODULE_ALIAS_CRYPTO("sha224");
 149 MODULE_LICENSE("GPL");
 150 MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");