1/*
2 * Cryptographic API.
3 *
4 * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
5 *
6 * s390 Version:
7 *   Copyright IBM Corp. 2005, 2011
8 *   Author(s): Jan Glauber (jang@de.ibm.com)
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 *
15 */
16#include <crypto/internal/hash.h>
17#include <linux/init.h>
18#include <linux/module.h>
19#include <crypto/sha.h>
20
21#include "crypt_s390.h"
22#include "sha.h"
23
24static int sha256_init(struct shash_desc *desc)
25{
26	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
27
28	sctx->state[0] = SHA256_H0;
29	sctx->state[1] = SHA256_H1;
30	sctx->state[2] = SHA256_H2;
31	sctx->state[3] = SHA256_H3;
32	sctx->state[4] = SHA256_H4;
33	sctx->state[5] = SHA256_H5;
34	sctx->state[6] = SHA256_H6;
35	sctx->state[7] = SHA256_H7;
36	sctx->count = 0;
37	sctx->func = KIMD_SHA_256;
38
39	return 0;
40}
41
42static int sha256_export(struct shash_desc *desc, void *out)
43{
44	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
45	struct sha256_state *octx = out;
46
47	octx->count = sctx->count;
48	memcpy(octx->state, sctx->state, sizeof(octx->state));
49	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
50	return 0;
51}
52
53static int sha256_import(struct shash_desc *desc, const void *in)
54{
55	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
56	const struct sha256_state *ictx = in;
57
58	sctx->count = ictx->count;
59	memcpy(sctx->state, ictx->state, sizeof(ictx->state));
60	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
61	sctx->func = KIMD_SHA_256;
62	return 0;
63}
64
65static struct shash_alg sha256_alg = {
66	.digestsize	=	SHA256_DIGEST_SIZE,
67	.init		=	sha256_init,
68	.update		=	s390_sha_update,
69	.final		=	s390_sha_final,
70	.export		=	sha256_export,
71	.import		=	sha256_import,
72	.descsize	=	sizeof(struct s390_sha_ctx),
73	.statesize	=	sizeof(struct sha256_state),
74	.base		=	{
75		.cra_name	=	"sha256",
76		.cra_driver_name=	"sha256-s390",
77		.cra_priority	=	CRYPT_S390_PRIORITY,
78		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
79		.cra_blocksize	=	SHA256_BLOCK_SIZE,
80		.cra_module	=	THIS_MODULE,
81	}
82};
83
84static int sha224_init(struct shash_desc *desc)
85{
86	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
87
88	sctx->state[0] = SHA224_H0;
89	sctx->state[1] = SHA224_H1;
90	sctx->state[2] = SHA224_H2;
91	sctx->state[3] = SHA224_H3;
92	sctx->state[4] = SHA224_H4;
93	sctx->state[5] = SHA224_H5;
94	sctx->state[6] = SHA224_H6;
95	sctx->state[7] = SHA224_H7;
96	sctx->count = 0;
97	sctx->func = KIMD_SHA_256;
98
99	return 0;
100}
101
102static struct shash_alg sha224_alg = {
103	.digestsize	=	SHA224_DIGEST_SIZE,
104	.init		=	sha224_init,
105	.update		=	s390_sha_update,
106	.final		=	s390_sha_final,
107	.export		=	sha256_export,
108	.import		=	sha256_import,
109	.descsize	=	sizeof(struct s390_sha_ctx),
110	.statesize	=	sizeof(struct sha256_state),
111	.base		=	{
112		.cra_name	=	"sha224",
113		.cra_driver_name=	"sha224-s390",
114		.cra_priority	=	CRYPT_S390_PRIORITY,
115		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
116		.cra_blocksize	=	SHA224_BLOCK_SIZE,
117		.cra_module	=	THIS_MODULE,
118	}
119};
120
121static int __init sha256_s390_init(void)
122{
123	int ret;
124
125	if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA))
126		return -EOPNOTSUPP;
127	ret = crypto_register_shash(&sha256_alg);
128	if (ret < 0)
129		goto out;
130	ret = crypto_register_shash(&sha224_alg);
131	if (ret < 0)
132		crypto_unregister_shash(&sha256_alg);
133out:
134	return ret;
135}
136
137static void __exit sha256_s390_fini(void)
138{
139	crypto_unregister_shash(&sha224_alg);
140	crypto_unregister_shash(&sha256_alg);
141}
142
143module_init(sha256_s390_init);
144module_exit(sha256_s390_fini);
145
146MODULE_ALIAS_CRYPTO("sha256");
147MODULE_ALIAS_CRYPTO("sha224");
148MODULE_LICENSE("GPL");
149MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
150