f9fefc5696329fd4f64e272ff6dac0c4e5ec0f91
[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 struct shash_alg alg = {
46         .digestsize     =       SHA256_DIGEST_SIZE,
47         .init           =       sha256_init,
48         .update         =       s390_sha_update,
49         .final          =       s390_sha_final,
50         .descsize       =       sizeof(struct s390_sha_ctx),
51         .base           =       {
52                 .cra_name       =       "sha256",
53                 .cra_driver_name=       "sha256-s390",
54                 .cra_priority   =       CRYPT_S390_PRIORITY,
55                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
56                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
57                 .cra_module     =       THIS_MODULE,
58         }
59 };
60
61 static int sha256_s390_init(void)
62 {
63         if (!crypt_s390_func_available(KIMD_SHA_256))
64                 return -EOPNOTSUPP;
65
66         return crypto_register_shash(&alg);
67 }
68
69 static void __exit sha256_s390_fini(void)
70 {
71         crypto_unregister_shash(&alg);
72 }
73
74 module_init(sha256_s390_init);
75 module_exit(sha256_s390_fini);
76
77 MODULE_ALIAS("sha256");
78 MODULE_LICENSE("GPL");
79 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");