arch/s390/crypto/sha256_s390.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Cryptographic API.
   4  *
   5  * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
   6  *
   7  * s390 Version:
   8  *   Copyright IBM Corp. 2005, 2011
   9  *   Author(s): Jan Glauber (jang@de.ibm.com)
  10  */
  11 #include <crypto/internal/hash.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/cpufeature.h>
  15 #include <crypto/sha.h>
  16 #include <asm/cpacf.h>
  17
  18 #include "sha.h"
  19
  20 static int sha256_init(struct shash_desc *desc)
  21 {
  22         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  23
  24         sctx->state[0] = SHA256_H0;
  25         sctx->state[1] = SHA256_H1;
  26         sctx->state[2] = SHA256_H2;
  27         sctx->state[3] = SHA256_H3;
  28         sctx->state[4] = SHA256_H4;
  29         sctx->state[5] = SHA256_H5;
  30         sctx->state[6] = SHA256_H6;
  31         sctx->state[7] = SHA256_H7;
  32         sctx->count = 0;
  33         sctx->func = CPACF_KIMD_SHA_256;
  34
  35         return 0;
  36 }
  37
  38 static int sha256_export(struct shash_desc *desc, void *out)
  39 {
  40         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  41         struct sha256_state *octx = out;
  42
  43         octx->count = sctx->count;
  44         memcpy(octx->state, sctx->state, sizeof(octx->state));
  45         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  46         return 0;
  47 }
  48
  49 static int sha256_import(struct shash_desc *desc, const void *in)
  50 {
  51         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  52         const struct sha256_state *ictx = in;
  53
  54         sctx->count = ictx->count;
  55         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  56         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  57         sctx->func = CPACF_KIMD_SHA_256;
  58         return 0;
  59 }
  60
  61 static struct shash_alg sha256_alg = {
  62         .digestsize     =       SHA256_DIGEST_SIZE,
  63         .init           =       sha256_init,
  64         .update         =       s390_sha_update,
  65         .final          =       s390_sha_final,
  66         .export         =       sha256_export,
  67         .import         =       sha256_import,
  68         .descsize       =       sizeof(struct s390_sha_ctx),
  69         .statesize      =       sizeof(struct sha256_state),
  70         .base           =       {
  71                 .cra_name       =       "sha256",
  72                 .cra_driver_name=       "sha256-s390",
  73                 .cra_priority   =       300,
  74                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  75                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  76                 .cra_module     =       THIS_MODULE,
  77         }
  78 };
  79
  80 static int sha224_init(struct shash_desc *desc)
  81 {
  82         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  83
  84         sctx->state[0] = SHA224_H0;
  85         sctx->state[1] = SHA224_H1;
  86         sctx->state[2] = SHA224_H2;
  87         sctx->state[3] = SHA224_H3;
  88         sctx->state[4] = SHA224_H4;
  89         sctx->state[5] = SHA224_H5;
  90         sctx->state[6] = SHA224_H6;
  91         sctx->state[7] = SHA224_H7;
  92         sctx->count = 0;
  93         sctx->func = CPACF_KIMD_SHA_256;
  94
  95         return 0;
  96 }
  97
  98 static struct shash_alg sha224_alg = {
  99         .digestsize     =       SHA224_DIGEST_SIZE,
 100         .init           =       sha224_init,
 101         .update         =       s390_sha_update,
 102         .final          =       s390_sha_final,
 103         .export         =       sha256_export,
 104         .import         =       sha256_import,
 105         .descsize       =       sizeof(struct s390_sha_ctx),
 106         .statesize      =       sizeof(struct sha256_state),
 107         .base           =       {
 108                 .cra_name       =       "sha224",
 109                 .cra_driver_name=       "sha224-s390",
 110                 .cra_priority   =       300,
 111                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 112                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 113                 .cra_module     =       THIS_MODULE,
 114         }
 115 };
 116
 117 static int __init sha256_s390_init(void)
 118 {
 119         int ret;
 120
 121         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
 122                 return -EOPNOTSUPP;
 123         ret = crypto_register_shash(&sha256_alg);
 124         if (ret < 0)
 125                 goto out;
 126         ret = crypto_register_shash(&sha224_alg);
 127         if (ret < 0)
 128                 crypto_unregister_shash(&sha256_alg);
 129 out:
 130         return ret;
 131 }
 132
 133 static void __exit sha256_s390_fini(void)
 134 {
 135         crypto_unregister_shash(&sha224_alg);
 136         crypto_unregister_shash(&sha256_alg);
 137 }
 138
 139 module_cpu_feature_match(MSA, sha256_s390_init);
 140 module_exit(sha256_s390_fini);
 141
 142 MODULE_ALIAS_CRYPTO("sha256");
 143 MODULE_ALIAS_CRYPTO("sha224");
 144 MODULE_LICENSE("GPL");
 145 MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");