tjh.dev
Linux kernel mirror (for testing)
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linux
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
27static 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
45static 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
56static 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
68static 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
87static 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
95static void __exit sha256_s390_fini(void)
96{
97 crypto_unregister_shash(&alg);
98}
99
100module_init(sha256_s390_init);
101module_exit(sha256_s390_fini);
102
103MODULE_ALIAS("sha256");
104MODULE_LICENSE("GPL");
105MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");