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Linux/arch/s390/crypto/sha256_s390.c

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  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");
146 

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