Merge tag 'usercopy-v5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
[linux-2.6-block.git] / arch / s390 / crypto / sha1_s390.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Cryptographic API.
4  *
5  * s390 implementation of the SHA1 Secure Hash Algorithm.
6  *
7  * Derived from cryptoapi implementation, adapted for in-place
8  * scatterlist interface.  Originally based on the public domain
9  * implementation written by Steve Reid.
10  *
11  * s390 Version:
12  *   Copyright IBM Corp. 2003, 2007
13  *   Author(s): Thomas Spatzier
14  *              Jan Glauber (jan.glauber@de.ibm.com)
15  *
16  * Derived from "crypto/sha1_generic.c"
17  *   Copyright (c) Alan Smithee.
18  *   Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
19  *   Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
20  */
21 #include <crypto/internal/hash.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/cpufeature.h>
25 #include <crypto/sha.h>
26 #include <asm/cpacf.h>
27
28 #include "sha.h"
29
30 static int sha1_init(struct shash_desc *desc)
31 {
32         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
33
34         sctx->state[0] = SHA1_H0;
35         sctx->state[1] = SHA1_H1;
36         sctx->state[2] = SHA1_H2;
37         sctx->state[3] = SHA1_H3;
38         sctx->state[4] = SHA1_H4;
39         sctx->count = 0;
40         sctx->func = CPACF_KIMD_SHA_1;
41
42         return 0;
43 }
44
45 static int sha1_export(struct shash_desc *desc, void *out)
46 {
47         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
48         struct sha1_state *octx = out;
49
50         octx->count = sctx->count;
51         memcpy(octx->state, sctx->state, sizeof(octx->state));
52         memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
53         return 0;
54 }
55
56 static int sha1_import(struct shash_desc *desc, const void *in)
57 {
58         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
59         const struct sha1_state *ictx = in;
60
61         sctx->count = ictx->count;
62         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
63         memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));
64         sctx->func = CPACF_KIMD_SHA_1;
65         return 0;
66 }
67
68 static struct shash_alg alg = {
69         .digestsize     =       SHA1_DIGEST_SIZE,
70         .init           =       sha1_init,
71         .update         =       s390_sha_update,
72         .final          =       s390_sha_final,
73         .export         =       sha1_export,
74         .import         =       sha1_import,
75         .descsize       =       sizeof(struct s390_sha_ctx),
76         .statesize      =       sizeof(struct sha1_state),
77         .base           =       {
78                 .cra_name       =       "sha1",
79                 .cra_driver_name=       "sha1-s390",
80                 .cra_priority   =       300,
81                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
82                 .cra_module     =       THIS_MODULE,
83         }
84 };
85
86 static int __init sha1_s390_init(void)
87 {
88         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
89                 return -ENODEV;
90         return crypto_register_shash(&alg);
91 }
92
93 static void __exit sha1_s390_fini(void)
94 {
95         crypto_unregister_shash(&alg);
96 }
97
98 module_cpu_feature_match(MSA, sha1_s390_init);
99 module_exit(sha1_s390_fini);
100
101 MODULE_ALIAS_CRYPTO("sha1");
102 MODULE_LICENSE("GPL");
103 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");