crypto: s390 - Respect STFL bit
[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 <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/crypto.h>
22 #include <crypto/sha.h>
23
24 #include "crypt_s390.h"
25 #include "sha.h"
26
27 static void sha256_init(struct crypto_tfm *tfm)
28 {
29         struct s390_sha_ctx *sctx = crypto_tfm_ctx(tfm);
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
43 static struct crypto_alg alg = {
44         .cra_name       =       "sha256",
45         .cra_driver_name =      "sha256-s390",
46         .cra_priority   =       CRYPT_S390_PRIORITY,
47         .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
48         .cra_blocksize  =       SHA256_BLOCK_SIZE,
49         .cra_ctxsize    =       sizeof(struct s390_sha_ctx),
50         .cra_module     =       THIS_MODULE,
51         .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
52         .cra_u          =       { .digest = {
53         .dia_digestsize =       SHA256_DIGEST_SIZE,
54         .dia_init       =       sha256_init,
55         .dia_update     =       s390_sha_update,
56         .dia_final      =       s390_sha_final } }
57 };
58
59 static int sha256_s390_init(void)
60 {
61         if (!crypt_s390_func_available(KIMD_SHA_256))
62                 return -EOPNOTSUPP;
63
64         return crypto_register_alg(&alg);
65 }
66
67 static void __exit sha256_s390_fini(void)
68 {
69         crypto_unregister_alg(&alg);
70 }
71
72 module_init(sha256_s390_init);
73 module_exit(sha256_s390_fini);
74
75 MODULE_ALIAS("sha256");
76 MODULE_LICENSE("GPL");
77 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");