1/*
2 * Cryptographic API.
3 *
4 * s390 implementation of the SHA512 and SHA38 Secure Hash Algorithm.
5 *
6 * Copyright IBM Corp. 2007
7 * Author(s): Jan Glauber (jang@de.ibm.com)
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15#include <crypto/internal/hash.h>
16#include <crypto/sha.h>
17#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/cpufeature.h>
22
23#include "sha.h"
24#include "crypt_s390.h"
25
26static int sha512_init(struct shash_desc *desc)
27{
28	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
29
30	*(__u64 *)&ctx->state[0] = 0x6a09e667f3bcc908ULL;
31	*(__u64 *)&ctx->state[2] = 0xbb67ae8584caa73bULL;
32	*(__u64 *)&ctx->state[4] = 0x3c6ef372fe94f82bULL;
33	*(__u64 *)&ctx->state[6] = 0xa54ff53a5f1d36f1ULL;
34	*(__u64 *)&ctx->state[8] = 0x510e527fade682d1ULL;
35	*(__u64 *)&ctx->state[10] = 0x9b05688c2b3e6c1fULL;
36	*(__u64 *)&ctx->state[12] = 0x1f83d9abfb41bd6bULL;
37	*(__u64 *)&ctx->state[14] = 0x5be0cd19137e2179ULL;
38	ctx->count = 0;
39	ctx->func = KIMD_SHA_512;
40
41	return 0;
42}
43
44static int sha512_export(struct shash_desc *desc, void *out)
45{
46	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
47	struct sha512_state *octx = out;
48
49	octx->count[0] = sctx->count;
50	octx->count[1] = 0;
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 sha512_import(struct shash_desc *desc, const void *in)
57{
58	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
59	const struct sha512_state *ictx = in;
60
61	if (unlikely(ictx->count[1]))
62		return -ERANGE;
63	sctx->count = ictx->count[0];
64
65	memcpy(sctx->state, ictx->state, sizeof(ictx->state));
66	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
67	sctx->func = KIMD_SHA_512;
68	return 0;
69}
70
71static struct shash_alg sha512_alg = {
72	.digestsize	=	SHA512_DIGEST_SIZE,
73	.init		=	sha512_init,
74	.update		=	s390_sha_update,
75	.final		=	s390_sha_final,
76	.export		=	sha512_export,
77	.import		=	sha512_import,
78	.descsize	=	sizeof(struct s390_sha_ctx),
79	.statesize	=	sizeof(struct sha512_state),
80	.base		=	{
81		.cra_name	=	"sha512",
82		.cra_driver_name=	"sha512-s390",
83		.cra_priority	=	CRYPT_S390_PRIORITY,
84		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
85		.cra_blocksize	=	SHA512_BLOCK_SIZE,
86		.cra_module	=	THIS_MODULE,
87	}
88};
89
90MODULE_ALIAS_CRYPTO("sha512");
91
92static int sha384_init(struct shash_desc *desc)
93{
94	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
95
96	*(__u64 *)&ctx->state[0] = 0xcbbb9d5dc1059ed8ULL;
97	*(__u64 *)&ctx->state[2] = 0x629a292a367cd507ULL;
98	*(__u64 *)&ctx->state[4] = 0x9159015a3070dd17ULL;
99	*(__u64 *)&ctx->state[6] = 0x152fecd8f70e5939ULL;
100	*(__u64 *)&ctx->state[8] = 0x67332667ffc00b31ULL;
101	*(__u64 *)&ctx->state[10] = 0x8eb44a8768581511ULL;
102	*(__u64 *)&ctx->state[12] = 0xdb0c2e0d64f98fa7ULL;
103	*(__u64 *)&ctx->state[14] = 0x47b5481dbefa4fa4ULL;
104	ctx->count = 0;
105	ctx->func = KIMD_SHA_512;
106
107	return 0;
108}
109
110static struct shash_alg sha384_alg = {
111	.digestsize	=	SHA384_DIGEST_SIZE,
112	.init		=	sha384_init,
113	.update		=	s390_sha_update,
114	.final		=	s390_sha_final,
115	.export		=	sha512_export,
116	.import		=	sha512_import,
117	.descsize	=	sizeof(struct s390_sha_ctx),
118	.statesize	=	sizeof(struct sha512_state),
119	.base		=	{
120		.cra_name	=	"sha384",
121		.cra_driver_name=	"sha384-s390",
122		.cra_priority	=	CRYPT_S390_PRIORITY,
123		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
124		.cra_blocksize	=	SHA384_BLOCK_SIZE,
125		.cra_ctxsize	=	sizeof(struct s390_sha_ctx),
126		.cra_module	=	THIS_MODULE,
127	}
128};
129
130MODULE_ALIAS_CRYPTO("sha384");
131
132static int __init init(void)
133{
134	int ret;
135
136	if (!crypt_s390_func_available(KIMD_SHA_512, CRYPT_S390_MSA))
137		return -EOPNOTSUPP;
138	if ((ret = crypto_register_shash(&sha512_alg)) < 0)
139		goto out;
140	if ((ret = crypto_register_shash(&sha384_alg)) < 0)
141		crypto_unregister_shash(&sha512_alg);
142out:
143	return ret;
144}
145
146static void __exit fini(void)
147{
148	crypto_unregister_shash(&sha512_alg);
149	crypto_unregister_shash(&sha384_alg);
150}
151
152module_cpu_feature_match(MSA, init);
153module_exit(fini);
154
155MODULE_LICENSE("GPL");
156MODULE_DESCRIPTION("SHA512 and SHA-384 Secure Hash Algorithm");
157