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
s390_sha256_init(struct shash_desc * desc)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 sctx->first_message_part = 0;
35
36 return 0;
37 }
38
sha256_export(struct shash_desc * desc,void * out)39 static int sha256_export(struct shash_desc *desc, void *out)
40 {
41 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
42 struct sha256_state *octx = out;
43
44 octx->count = sctx->count;
45 memcpy(octx->state, sctx->state, sizeof(octx->state));
46 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
47 return 0;
48 }
49
sha256_import(struct shash_desc * desc,const void * in)50 static int sha256_import(struct shash_desc *desc, const void *in)
51 {
52 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
53 const struct sha256_state *ictx = in;
54
55 sctx->count = ictx->count;
56 memcpy(sctx->state, ictx->state, sizeof(ictx->state));
57 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
58 sctx->func = CPACF_KIMD_SHA_256;
59 sctx->first_message_part = 0;
60 return 0;
61 }
62
63 static struct shash_alg sha256_alg = {
64 .digestsize = SHA256_DIGEST_SIZE,
65 .init = s390_sha256_init,
66 .update = s390_sha_update,
67 .final = s390_sha_final,
68 .export = sha256_export,
69 .import = sha256_import,
70 .descsize = sizeof(struct s390_sha_ctx),
71 .statesize = sizeof(struct sha256_state),
72 .base = {
73 .cra_name = "sha256",
74 .cra_driver_name= "sha256-s390",
75 .cra_priority = 300,
76 .cra_blocksize = SHA256_BLOCK_SIZE,
77 .cra_module = THIS_MODULE,
78 }
79 };
80
s390_sha224_init(struct shash_desc * desc)81 static int s390_sha224_init(struct shash_desc *desc)
82 {
83 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
84
85 sctx->state[0] = SHA224_H0;
86 sctx->state[1] = SHA224_H1;
87 sctx->state[2] = SHA224_H2;
88 sctx->state[3] = SHA224_H3;
89 sctx->state[4] = SHA224_H4;
90 sctx->state[5] = SHA224_H5;
91 sctx->state[6] = SHA224_H6;
92 sctx->state[7] = SHA224_H7;
93 sctx->count = 0;
94 sctx->func = CPACF_KIMD_SHA_256;
95 sctx->first_message_part = 0;
96
97 return 0;
98 }
99
100 static struct shash_alg sha224_alg = {
101 .digestsize = SHA224_DIGEST_SIZE,
102 .init = s390_sha224_init,
103 .update = s390_sha_update,
104 .final = s390_sha_final,
105 .export = sha256_export,
106 .import = sha256_import,
107 .descsize = sizeof(struct s390_sha_ctx),
108 .statesize = sizeof(struct sha256_state),
109 .base = {
110 .cra_name = "sha224",
111 .cra_driver_name= "sha224-s390",
112 .cra_priority = 300,
113 .cra_blocksize = SHA224_BLOCK_SIZE,
114 .cra_module = THIS_MODULE,
115 }
116 };
117
sha256_s390_init(void)118 static int __init sha256_s390_init(void)
119 {
120 int ret;
121
122 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
123 return -ENODEV;
124 ret = crypto_register_shash(&sha256_alg);
125 if (ret < 0)
126 goto out;
127 ret = crypto_register_shash(&sha224_alg);
128 if (ret < 0)
129 crypto_unregister_shash(&sha256_alg);
130 out:
131 return ret;
132 }
133
sha256_s390_fini(void)134 static void __exit sha256_s390_fini(void)
135 {
136 crypto_unregister_shash(&sha224_alg);
137 crypto_unregister_shash(&sha256_alg);
138 }
139
140 module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha256_s390_init);
141 module_exit(sha256_s390_fini);
142
143 MODULE_ALIAS_CRYPTO("sha256");
144 MODULE_ALIAS_CRYPTO("sha224");
145 MODULE_LICENSE("GPL");
146 MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
147