1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Cryptographic API.
4 *
5 * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
6 *
7 * s390 Version:
8 * Copyright IBM Corp. 2019
9 * Author(s): Joerg Schmidbauer (jschmidb@de.ibm.com)
10 */
11 #include <crypto/internal/hash.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/cpufeature.h>
15 #include <crypto/sha3.h>
16 #include <asm/cpacf.h>
17
18 #include "sha.h"
19
20 static int sha3_256_init(struct shash_desc *desc)
21 {
22 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
23
24 memset(sctx->state, 0, sizeof(sctx->state));
25 sctx->count = 0;
26 sctx->func = CPACF_KIMD_SHA3_256;
27
28 return 0;
29 }
30
31 static int sha3_256_export(struct shash_desc *desc, void *out)
32 {
33 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
34 struct sha3_state *octx = out;
35
36 octx->rsiz = sctx->count;
37 memcpy(octx->st, sctx->state, sizeof(octx->st));
38 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
39
40 return 0;
41 }
42
43 static int sha3_256_import(struct shash_desc *desc, const void *in)
44 {
45 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
46 const struct sha3_state *ictx = in;
47
48 sctx->count = ictx->rsiz;
49 memcpy(sctx->state, ictx->st, sizeof(ictx->st));
50 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
51 sctx->func = CPACF_KIMD_SHA3_256;
52
53 return 0;
54 }
55
56 static int sha3_224_import(struct shash_desc *desc, const void *in)
57 {
58 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
59 const struct sha3_state *ictx = in;
60
61 sctx->count = ictx->rsiz;
62 memcpy(sctx->state, ictx->st, sizeof(ictx->st));
63 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
64 sctx->func = CPACF_KIMD_SHA3_224;
65
66 return 0;
67 }
68
69 static struct shash_alg sha3_256_alg = {
70 .digestsize = SHA3_256_DIGEST_SIZE, /* = 32 */
71 .init = sha3_256_init,
72 .update = s390_sha_update,
73 .final = s390_sha_final,
74 .export = sha3_256_export,
75 .import = sha3_256_import,
76 .descsize = sizeof(struct s390_sha_ctx),
77 .statesize = sizeof(struct sha3_state),
78 .base = {
79 .cra_name = "sha3-256",
80 .cra_driver_name = "sha3-256-s390",
81 .cra_priority = 300,
82 .cra_blocksize = SHA3_256_BLOCK_SIZE,
83 .cra_module = THIS_MODULE,
84 }
85 };
86
87 static int sha3_224_init(struct shash_desc *desc)
88 {
89 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
90
91 memset(sctx->state, 0, sizeof(sctx->state));
92 sctx->count = 0;
93 sctx->func = CPACF_KIMD_SHA3_224;
94
95 return 0;
96 }
97
98 static struct shash_alg sha3_224_alg = {
99 .digestsize = SHA3_224_DIGEST_SIZE,
100 .init = sha3_224_init,
101 .update = s390_sha_update,
102 .final = s390_sha_final,
103 .export = sha3_256_export, /* same as for 256 */
104 .import = sha3_224_import, /* function code different! */
105 .descsize = sizeof(struct s390_sha_ctx),
106 .statesize = sizeof(struct sha3_state),
107 .base = {
108 .cra_name = "sha3-224",
109 .cra_driver_name = "sha3-224-s390",
110 .cra_priority = 300,
111 .cra_blocksize = SHA3_224_BLOCK_SIZE,
112 .cra_module = THIS_MODULE,
113 }
114 };
115
116 static int __init sha3_256_s390_init(void)
117 {
118 int ret;
119
120 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA3_256))
121 return -ENODEV;
122
123 ret = crypto_register_shash(&sha3_256_alg);
124 if (ret < 0)
125 goto out;
126
127 ret = crypto_register_shash(&sha3_224_alg);
128 if (ret < 0)
129 crypto_unregister_shash(&sha3_256_alg);
130 out:
131 return ret;
132 }
133
134 static void __exit sha3_256_s390_fini(void)
135 {
136 crypto_unregister_shash(&sha3_224_alg);
137 crypto_unregister_shash(&sha3_256_alg);
138 }
139
140 module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha3_256_s390_init);
141 module_exit(sha3_256_s390_fini);
142
143 MODULE_ALIAS_CRYPTO("sha3-256");
144 MODULE_ALIAS_CRYPTO("sha3-224");
145 MODULE_LICENSE("GPL");
146 MODULE_DESCRIPTION("SHA3-256 and SHA3-224 Secure Hash Algorithm");
147
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