1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Cryptographic API.
4 *
5 * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
6 *
7 * s390 Version:
8 *   Copyright IBM Corp. 2005, 2011
9 *   Author(s): Jan Glauber (jang@de.ibm.com)
10 */
11#include <crypto/internal/hash.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/cpufeature.h>
15#include <crypto/sha2.h>
16#include <asm/cpacf.h>
17
18#include "sha.h"
19
20static int s390_sha256_init(struct shash_desc *desc)
21{
22	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
23
24	sctx->state[0] = SHA256_H0;
25	sctx->state[1] = SHA256_H1;
26	sctx->state[2] = SHA256_H2;
27	sctx->state[3] = SHA256_H3;
28	sctx->state[4] = SHA256_H4;
29	sctx->state[5] = SHA256_H5;
30	sctx->state[6] = SHA256_H6;
31	sctx->state[7] = SHA256_H7;
32	sctx->count = 0;
33	sctx->func = CPACF_KIMD_SHA_256;
34
35	return 0;
36}
37
38static int sha256_export(struct shash_desc *desc, void *out)
39{
40	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
41	struct sha256_state *octx = out;
42
43	octx->count = sctx->count;
44	memcpy(octx->state, sctx->state, sizeof(octx->state));
45	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
46	return 0;
47}
48
49static int sha256_import(struct shash_desc *desc, const void *in)
50{
51	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
52	const struct sha256_state *ictx = in;
53
54	sctx->count = ictx->count;
55	memcpy(sctx->state, ictx->state, sizeof(ictx->state));
56	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
57	sctx->func = CPACF_KIMD_SHA_256;
58	return 0;
59}
60
61static struct shash_alg sha256_alg = {
62	.digestsize	=	SHA256_DIGEST_SIZE,
63	.init		=	s390_sha256_init,
64	.update		=	s390_sha_update,
65	.final		=	s390_sha_final,
66	.export		=	sha256_export,
67	.import		=	sha256_import,
68	.descsize	=	sizeof(struct s390_sha_ctx),
69	.statesize	=	sizeof(struct sha256_state),
70	.base		=	{
71		.cra_name	=	"sha256",
72		.cra_driver_name=	"sha256-s390",
73		.cra_priority	=	300,
74		.cra_blocksize	=	SHA256_BLOCK_SIZE,
75		.cra_module	=	THIS_MODULE,
76	}
77};
78
79static int s390_sha224_init(struct shash_desc *desc)
80{
81	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
82
83	sctx->state[0] = SHA224_H0;
84	sctx->state[1] = SHA224_H1;
85	sctx->state[2] = SHA224_H2;
86	sctx->state[3] = SHA224_H3;
87	sctx->state[4] = SHA224_H4;
88	sctx->state[5] = SHA224_H5;
89	sctx->state[6] = SHA224_H6;
90	sctx->state[7] = SHA224_H7;
91	sctx->count = 0;
92	sctx->func = CPACF_KIMD_SHA_256;
93
94	return 0;
95}
96
97static struct shash_alg sha224_alg = {
98	.digestsize	=	SHA224_DIGEST_SIZE,
99	.init		=	s390_sha224_init,
100	.update		=	s390_sha_update,
101	.final		=	s390_sha_final,
102	.export		=	sha256_export,
103	.import		=	sha256_import,
104	.descsize	=	sizeof(struct s390_sha_ctx),
105	.statesize	=	sizeof(struct sha256_state),
106	.base		=	{
107		.cra_name	=	"sha224",
108		.cra_driver_name=	"sha224-s390",
109		.cra_priority	=	300,
110		.cra_blocksize	=	SHA224_BLOCK_SIZE,
111		.cra_module	=	THIS_MODULE,
112	}
113};
114
115static int __init sha256_s390_init(void)
116{
117	int ret;
118
119	if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
120		return -ENODEV;
121	ret = crypto_register_shash(&sha256_alg);
122	if (ret < 0)
123		goto out;
124	ret = crypto_register_shash(&sha224_alg);
125	if (ret < 0)
126		crypto_unregister_shash(&sha256_alg);
127out:
128	return ret;
129}
130
131static void __exit sha256_s390_fini(void)
132{
133	crypto_unregister_shash(&sha224_alg);
134	crypto_unregister_shash(&sha256_alg);
135}
136
137module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha256_s390_init);
138module_exit(sha256_s390_fini);
139
140MODULE_ALIAS_CRYPTO("sha256");
141MODULE_ALIAS_CRYPTO("sha224");
142MODULE_LICENSE("GPL");
143MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
144