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Linux/arch/s390/crypto/sha256_s390.c

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  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");
151 

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