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/sha1.h>
26#include <asm/cpacf.h>
27
28#include "sha.h"
29
30static int s390_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
45static int s390_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
56static int s390_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
68static struct shash_alg alg = {
69	.digestsize	=	SHA1_DIGEST_SIZE,
70	.init		=	s390_sha1_init,
71	.update		=	s390_sha_update,
72	.final		=	s390_sha_final,
73	.export		=	s390_sha1_export,
74	.import		=	s390_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
86static 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
93static void __exit sha1_s390_fini(void)
94{
95	crypto_unregister_shash(&alg);
96}
97
98module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha1_s390_init);
99module_exit(sha1_s390_fini);
100
101MODULE_ALIAS_CRYPTO("sha1");
102MODULE_LICENSE("GPL");
103MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
104