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. 2005, 2011
9 * Author(s): Jan Glauber (jang@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/sha2.h>
16 #include <asm/cpacf.h>
17
18 #include "sha.h"
19
20 static int s390_sha256_init(struct shash_desc *desc)
21 {
22 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
23
24 sctx->state[0] = SHA256_H0;
25 sctx->state[1] = SHA256_H1;
26 sctx->state[2] = SHA256_H2;
27 sctx->state[3] = SHA256_H3;
28 sctx->state[4] = SHA256_H4;
29 sctx->state[5] = SHA256_H5;
30 sctx->state[6] = SHA256_H6;
31 sctx->state[7] = SHA256_H7;
32 sctx->count = 0;
33 sctx->func = CPACF_KIMD_SHA_256;
34
35 return 0;
36 }
37
38 static int sha256_export(struct shash_desc *desc, void *out)
39 {
40 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
41 struct sha256_state *octx = out;
42
43 octx->count = sctx->count;
44 memcpy(octx->state, sctx->state, sizeof(octx->state));
45 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
46 return 0;
47 }
48
49 static int sha256_import(struct shash_desc *desc, const void *in)
50 {
51 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
52 const struct sha256_state *ictx = in;
53
54 sctx->count = ictx->count;
55 memcpy(sctx->state, ictx->state, sizeof(ictx->state));
56 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
57 sctx->func = CPACF_KIMD_SHA_256;
58 return 0;
59 }
60
61 static struct shash_alg sha256_alg = {
62 .digestsize = SHA256_DIGEST_SIZE,
63 .init = s390_sha256_init,
64 .update = s390_sha_update,
65 .final = s390_sha_final,
66 .export = sha256_export,
67 .import = sha256_import,
68 .descsize = sizeof(struct s390_sha_ctx),
69 .statesize = sizeof(struct sha256_state),
70 .base = {
71 .cra_name = "sha256",
72 .cra_driver_name= "sha256-s390",
73 .cra_priority = 300,
74 .cra_blocksize = SHA256_BLOCK_SIZE,
75 .cra_module = THIS_MODULE,
76 }
77 };
78
79 static int s390_sha224_init(struct shash_desc *desc)
80 {
81 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
82
83 sctx->state[0] = SHA224_H0;
84 sctx->state[1] = SHA224_H1;
85 sctx->state[2] = SHA224_H2;
86 sctx->state[3] = SHA224_H3;
87 sctx->state[4] = SHA224_H4;
88 sctx->state[5] = SHA224_H5;
89 sctx->state[6] = SHA224_H6;
90 sctx->state[7] = SHA224_H7;
91 sctx->count = 0;
92 sctx->func = CPACF_KIMD_SHA_256;
93
94 return 0;
95 }
96
97 static struct shash_alg sha224_alg = {
98 .digestsize = SHA224_DIGEST_SIZE,
99 .init = s390_sha224_init,
100 .update = s390_sha_update,
101 .final = s390_sha_final,
102 .export = sha256_export,
103 .import = sha256_import,
104 .descsize = sizeof(struct s390_sha_ctx),
105 .statesize = sizeof(struct sha256_state),
106 .base = {
107 .cra_name = "sha224",
108 .cra_driver_name= "sha224-s390",
109 .cra_priority = 300,
110 .cra_blocksize = SHA224_BLOCK_SIZE,
111 .cra_module = THIS_MODULE,
112 }
113 };
114
115 static int __init sha256_s390_init(void)
116 {
117 int ret;
118
119 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
120 return -ENODEV;
121 ret = crypto_register_shash(&sha256_alg);
122 if (ret < 0)
123 goto out;
124 ret = crypto_register_shash(&sha224_alg);
125 if (ret < 0)
126 crypto_unregister_shash(&sha256_alg);
127 out:
128 return ret;
129 }
130
131 static void __exit sha256_s390_fini(void)
132 {
133 crypto_unregister_shash(&sha224_alg);
134 crypto_unregister_shash(&sha256_alg);
135 }
136
137 module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha256_s390_init);
138 module_exit(sha256_s390_fini);
139
140 MODULE_ALIAS_CRYPTO("sha256");
141 MODULE_ALIAS_CRYPTO("sha224");
142 MODULE_LICENSE("GPL");
143 MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
144
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