1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Cryptographic API.
4 *
5 * s390 implementation of the SHA512 and SHA384 Secure Hash Algorithm.
6 *
7 * Copyright IBM Corp. 2019
8 * Author(s): Joerg Schmidbauer (jschmidb@de.ibm.com)
9 */
10 #include <crypto/internal/hash.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/cpufeature.h>
14 #include <crypto/sha3.h>
15 #include <asm/cpacf.h>
16
17 #include "sha.h"
18
19 static int sha3_512_init(struct shash_desc *desc)
20 {
21 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
22
23 memset(sctx->state, 0, sizeof(sctx->state));
24 sctx->count = 0;
25 sctx->func = CPACF_KIMD_SHA3_512;
26
27 return 0;
28 }
29
30 static int sha3_512_export(struct shash_desc *desc, void *out)
31 {
32 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
33 struct sha3_state *octx = out;
34
35 octx->rsiz = sctx->count;
36 octx->rsizw = sctx->count >> 32;
37
38 memcpy(octx->st, sctx->state, sizeof(octx->st));
39 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
40
41 return 0;
42 }
43
44 static int sha3_512_import(struct shash_desc *desc, const void *in)
45 {
46 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
47 const struct sha3_state *ictx = in;
48
49 if (unlikely(ictx->rsizw))
50 return -ERANGE;
51 sctx->count = ictx->rsiz;
52
53 memcpy(sctx->state, ictx->st, sizeof(ictx->st));
54 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
55 sctx->func = CPACF_KIMD_SHA3_512;
56
57 return 0;
58 }
59
60 static int sha3_384_import(struct shash_desc *desc, const void *in)
61 {
62 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
63 const struct sha3_state *ictx = in;
64
65 if (unlikely(ictx->rsizw))
66 return -ERANGE;
67 sctx->count = ictx->rsiz;
68
69 memcpy(sctx->state, ictx->st, sizeof(ictx->st));
70 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
71 sctx->func = CPACF_KIMD_SHA3_384;
72
73 return 0;
74 }
75
76 static struct shash_alg sha3_512_alg = {
77 .digestsize = SHA3_512_DIGEST_SIZE,
78 .init = sha3_512_init,
79 .update = s390_sha_update,
80 .final = s390_sha_final,
81 .export = sha3_512_export,
82 .import = sha3_512_import,
83 .descsize = sizeof(struct s390_sha_ctx),
84 .statesize = sizeof(struct sha3_state),
85 .base = {
86 .cra_name = "sha3-512",
87 .cra_driver_name = "sha3-512-s390",
88 .cra_priority = 300,
89 .cra_blocksize = SHA3_512_BLOCK_SIZE,
90 .cra_module = THIS_MODULE,
91 }
92 };
93
94 MODULE_ALIAS_CRYPTO("sha3-512");
95
96 static int sha3_384_init(struct shash_desc *desc)
97 {
98 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
99
100 memset(sctx->state, 0, sizeof(sctx->state));
101 sctx->count = 0;
102 sctx->func = CPACF_KIMD_SHA3_384;
103
104 return 0;
105 }
106
107 static struct shash_alg sha3_384_alg = {
108 .digestsize = SHA3_384_DIGEST_SIZE,
109 .init = sha3_384_init,
110 .update = s390_sha_update,
111 .final = s390_sha_final,
112 .export = sha3_512_export, /* same as for 512 */
113 .import = sha3_384_import, /* function code different! */
114 .descsize = sizeof(struct s390_sha_ctx),
115 .statesize = sizeof(struct sha3_state),
116 .base = {
117 .cra_name = "sha3-384",
118 .cra_driver_name = "sha3-384-s390",
119 .cra_priority = 300,
120 .cra_blocksize = SHA3_384_BLOCK_SIZE,
121 .cra_ctxsize = sizeof(struct s390_sha_ctx),
122 .cra_module = THIS_MODULE,
123 }
124 };
125
126 MODULE_ALIAS_CRYPTO("sha3-384");
127
128 static int __init init(void)
129 {
130 int ret;
131
132 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA3_512))
133 return -ENODEV;
134 ret = crypto_register_shash(&sha3_512_alg);
135 if (ret < 0)
136 goto out;
137 ret = crypto_register_shash(&sha3_384_alg);
138 if (ret < 0)
139 crypto_unregister_shash(&sha3_512_alg);
140 out:
141 return ret;
142 }
143
144 static void __exit fini(void)
145 {
146 crypto_unregister_shash(&sha3_512_alg);
147 crypto_unregister_shash(&sha3_384_alg);
148 }
149
150 module_cpu_feature_match(S390_CPU_FEATURE_MSA, init);
151 module_exit(fini);
152
153 MODULE_LICENSE("GPL");
154 MODULE_DESCRIPTION("SHA3-512 and SHA3-384 Secure Hash Algorithm");
155
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