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 
s390_sha1_init(struct shash_desc * desc)30 static 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 
s390_sha1_export(struct shash_desc * desc,void * out)45 static 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 
s390_sha1_import(struct shash_desc * desc,const void * in)56 static 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 
68 static 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 
sha1_s390_init(void)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 
sha1_s390_fini(void)93 static void __exit sha1_s390_fini(void)
94 {
95 	crypto_unregister_shash(&alg);
96 }
97 
98 module_cpu_feature_match(S390_CPU_FEATURE_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");
104