arch/s390/crypto/sha3_256_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. 2019
   9  *   Author(s): Joerg Schmidbauer ([email protected])
  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/sha3.h>
  16 #include <asm/cpacf.h>
  17
  18 #include "sha.h"
  19
  20 static int sha3_256_init(struct shash_desc *desc)
  21 {
  22         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  23
  24         if (!test_facility(86)) /* msa 12 */
  25                 memset(sctx->state, 0, sizeof(sctx->state));
  26         sctx->count = 0;
  27         sctx->func = CPACF_KIMD_SHA3_256;
  28         sctx->first_message_part = 1;
  29
  30         return 0;
  31 }
  32
  33 static int sha3_256_export(struct shash_desc *desc, void *out)
  34 {
  35         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  36         struct sha3_state *octx = out;
  37
  38         octx->rsiz = sctx->count;
  39         memcpy(octx->st, sctx->state, sizeof(octx->st));
  40         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
  41         octx->partial = sctx->first_message_part;
  42
  43         return 0;
  44 }
  45
  46 static int sha3_256_import(struct shash_desc *desc, const void *in)
  47 {
  48         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  49         const struct sha3_state *ictx = in;
  50
  51         sctx->count = ictx->rsiz;
  52         memcpy(sctx->state, ictx->st, sizeof(ictx->st));
  53         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  54         sctx->first_message_part = ictx->partial;
  55         sctx->func = CPACF_KIMD_SHA3_256;
  56
  57         return 0;
  58 }
  59
  60 static int sha3_224_import(struct shash_desc *desc, const void *in)
  61 {
  62         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  63         const struct sha3_state *ictx = in;
  64
  65         sctx->count = ictx->rsiz;
  66         memcpy(sctx->state, ictx->st, sizeof(ictx->st));
  67         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
  68         sctx->first_message_part = ictx->partial;
  69         sctx->func = CPACF_KIMD_SHA3_224;
  70
  71         return 0;
  72 }
  73
  74 static struct shash_alg sha3_256_alg = {
  75         .digestsize     =       SHA3_256_DIGEST_SIZE,      /* = 32 */
  76         .init           =       sha3_256_init,
  77         .update         =       s390_sha_update,
  78         .final          =       s390_sha_final,
  79         .export         =       sha3_256_export,
  80         .import         =       sha3_256_import,
  81         .descsize       =       sizeof(struct s390_sha_ctx),
  82         .statesize      =       sizeof(struct sha3_state),
  83         .base           =       {
  84                 .cra_name        =      "sha3-256",
  85                 .cra_driver_name =      "sha3-256-s390",
  86                 .cra_priority    =      300,
  87                 .cra_blocksize   =      SHA3_256_BLOCK_SIZE,
  88                 .cra_module      =      THIS_MODULE,
  89         }
  90 };
  91
  92 static int sha3_224_init(struct shash_desc *desc)
  93 {
  94         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  95
  96         if (!test_facility(86)) /* msa 12 */
  97                 memset(sctx->state, 0, sizeof(sctx->state));
  98         sctx->count = 0;
  99         sctx->func = CPACF_KIMD_SHA3_224;
 100         sctx->first_message_part = 1;
 101
 102         return 0;
 103 }
 104
 105 static struct shash_alg sha3_224_alg = {
 106         .digestsize     =       SHA3_224_DIGEST_SIZE,
 107         .init           =       sha3_224_init,
 108         .update         =       s390_sha_update,
 109         .final          =       s390_sha_final,
 110         .export         =       sha3_256_export, /* same as for 256 */
 111         .import         =       sha3_224_import, /* function code different! */
 112         .descsize       =       sizeof(struct s390_sha_ctx),
 113         .statesize      =       sizeof(struct sha3_state),
 114         .base           =       {
 115                 .cra_name        =      "sha3-224",
 116                 .cra_driver_name =      "sha3-224-s390",
 117                 .cra_priority    =      300,
 118                 .cra_blocksize   =      SHA3_224_BLOCK_SIZE,
 119                 .cra_module      =      THIS_MODULE,
 120         }
 121 };
 122
 123 static int __init sha3_256_s390_init(void)
 124 {
 125         int ret;
 126
 127         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA3_256))
 128                 return -ENODEV;
 129
 130         ret = crypto_register_shash(&sha3_256_alg);
 131         if (ret < 0)
 132                 goto out;
 133
 134         ret = crypto_register_shash(&sha3_224_alg);
 135         if (ret < 0)
 136                 crypto_unregister_shash(&sha3_256_alg);
 137 out:
 138         return ret;
 139 }
 140
 141 static void __exit sha3_256_s390_fini(void)
 142 {
 143         crypto_unregister_shash(&sha3_224_alg);
 144         crypto_unregister_shash(&sha3_256_alg);
 145 }
 146
 147 module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha3_256_s390_init);
 148 module_exit(sha3_256_s390_fini);
 149
 150 MODULE_ALIAS_CRYPTO("sha3-256");
 151 MODULE_ALIAS_CRYPTO("sha3-224");
 152 MODULE_LICENSE("GPL");
 153 MODULE_DESCRIPTION("SHA3-256 and SHA3-224 Secure Hash Algorithm");