crypto: sha-s390 - Fix warnings in import function
[linux-2.6.git] / arch / s390 / crypto / sha256_s390.c
1 /*
2  * Cryptographic API.
3  *
4  * s390 implementation of the SHA256 Secure Hash Algorithm.
5  *
6  * s390 Version:
7  *   Copyright IBM Corp. 2005,2007
8  *   Author(s): Jan Glauber (jang@de.ibm.com)
9  *
10  * Derived from "crypto/sha256_generic.c"
11  * and "arch/s390/crypto/sha1_s390.c"
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License as published by the Free
15  * Software Foundation; either version 2 of the License, or (at your option)
16  * any later version.
17  *
18  */
19 #include <crypto/internal/hash.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <crypto/sha.h>
23
24 #include "crypt_s390.h"
25 #include "sha.h"
26
27 static int sha256_init(struct shash_desc *desc)
28 {
29         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
30
31         sctx->state[0] = SHA256_H0;
32         sctx->state[1] = SHA256_H1;
33         sctx->state[2] = SHA256_H2;
34         sctx->state[3] = SHA256_H3;
35         sctx->state[4] = SHA256_H4;
36         sctx->state[5] = SHA256_H5;
37         sctx->state[6] = SHA256_H6;
38         sctx->state[7] = SHA256_H7;
39         sctx->count = 0;
40         sctx->func = KIMD_SHA_256;
41
42         return 0;
43 }
44
45 static int sha256_export(struct shash_desc *desc, void *out)
46 {
47         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
48         struct sha256_state *octx = out;
49
50         octx->count = sctx->count;
51         memcpy(octx->state, sctx->state, sizeof(octx->state));
52         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
53         return 0;
54 }
55
56 static int sha256_import(struct shash_desc *desc, const void *in)
57 {
58         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
59         const struct sha256_state *ictx = in;
60
61         sctx->count = ictx->count;
62         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
63         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
64         sctx->func = KIMD_SHA_256;
65         return 0;
66 }
67
68 static struct shash_alg alg = {
69         .digestsize     =       SHA256_DIGEST_SIZE,
70         .init           =       sha256_init,
71         .update         =       s390_sha_update,
72         .final          =       s390_sha_final,
73         .export         =       sha256_export,
74         .import         =       sha256_import,
75         .descsize       =       sizeof(struct s390_sha_ctx),
76         .statesize      =       sizeof(struct sha256_state),
77         .base           =       {
78                 .cra_name       =       "sha256",
79                 .cra_driver_name=       "sha256-s390",
80                 .cra_priority   =       CRYPT_S390_PRIORITY,
81                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
82                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
83                 .cra_module     =       THIS_MODULE,
84         }
85 };
86
87 static int sha256_s390_init(void)
88 {
89         if (!crypt_s390_func_available(KIMD_SHA_256))
90                 return -EOPNOTSUPP;
91
92         return crypto_register_shash(&alg);
93 }
94
95 static void __exit sha256_s390_fini(void)
96 {
97         crypto_unregister_shash(&alg);
98 }
99
100 module_init(sha256_s390_init);
101 module_exit(sha256_s390_fini);
102
103 MODULE_ALIAS("sha256");
104 MODULE_LICENSE("GPL");
105 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");