1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Cryptographic API.
4 *
5 * s390 implementation of the SHA512 and SHA38 Secure Hash Algorithm.
6 *
7 * Copyright IBM Corp. 2007
8 * Author(s): Jan Glauber (jang@de.ibm.com)
9 */
10 #include <crypto/internal/hash.h>
11 #include <crypto/sha2.h>
12 #include <linux/errno.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/cpufeature.h>
17 #include <asm/cpacf.h>
18
19 #include "sha.h"
20
21 static int sha512_init(struct shash_desc *desc)
22 {
23 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
24
25 *(__u64 *)&ctx->state[0] = SHA512_H0;
26 *(__u64 *)&ctx->state[2] = SHA512_H1;
27 *(__u64 *)&ctx->state[4] = SHA512_H2;
28 *(__u64 *)&ctx->state[6] = SHA512_H3;
29 *(__u64 *)&ctx->state[8] = SHA512_H4;
30 *(__u64 *)&ctx->state[10] = SHA512_H5;
31 *(__u64 *)&ctx->state[12] = SHA512_H6;
32 *(__u64 *)&ctx->state[14] = SHA512_H7;
33 ctx->count = 0;
34 ctx->func = CPACF_KIMD_SHA_512;
35
36 return 0;
37 }
38
39 static int sha512_export(struct shash_desc *desc, void *out)
40 {
41 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
42 struct sha512_state *octx = out;
43
44 octx->count[0] = sctx->count;
45 octx->count[1] = 0;
46 memcpy(octx->state, sctx->state, sizeof(octx->state));
47 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
48 return 0;
49 }
50
51 static int sha512_import(struct shash_desc *desc, const void *in)
52 {
53 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
54 const struct sha512_state *ictx = in;
55
56 if (unlikely(ictx->count[1]))
57 return -ERANGE;
58 sctx->count = ictx->count[0];
59
60 memcpy(sctx->state, ictx->state, sizeof(ictx->state));
61 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
62 sctx->func = CPACF_KIMD_SHA_512;
63 return 0;
64 }
65
66 static struct shash_alg sha512_alg = {
67 .digestsize = SHA512_DIGEST_SIZE,
68 .init = sha512_init,
69 .update = s390_sha_update,
70 .final = s390_sha_final,
71 .export = sha512_export,
72 .import = sha512_import,
73 .descsize = sizeof(struct s390_sha_ctx),
74 .statesize = sizeof(struct sha512_state),
75 .base = {
76 .cra_name = "sha512",
77 .cra_driver_name= "sha512-s390",
78 .cra_priority = 300,
79 .cra_blocksize = SHA512_BLOCK_SIZE,
80 .cra_module = THIS_MODULE,
81 }
82 };
83
84 MODULE_ALIAS_CRYPTO("sha512");
85
86 static int sha384_init(struct shash_desc *desc)
87 {
88 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
89
90 *(__u64 *)&ctx->state[0] = SHA384_H0;
91 *(__u64 *)&ctx->state[2] = SHA384_H1;
92 *(__u64 *)&ctx->state[4] = SHA384_H2;
93 *(__u64 *)&ctx->state[6] = SHA384_H3;
94 *(__u64 *)&ctx->state[8] = SHA384_H4;
95 *(__u64 *)&ctx->state[10] = SHA384_H5;
96 *(__u64 *)&ctx->state[12] = SHA384_H6;
97 *(__u64 *)&ctx->state[14] = SHA384_H7;
98 ctx->count = 0;
99 ctx->func = CPACF_KIMD_SHA_512;
100
101 return 0;
102 }
103
104 static struct shash_alg sha384_alg = {
105 .digestsize = SHA384_DIGEST_SIZE,
106 .init = sha384_init,
107 .update = s390_sha_update,
108 .final = s390_sha_final,
109 .export = sha512_export,
110 .import = sha512_import,
111 .descsize = sizeof(struct s390_sha_ctx),
112 .statesize = sizeof(struct sha512_state),
113 .base = {
114 .cra_name = "sha384",
115 .cra_driver_name= "sha384-s390",
116 .cra_priority = 300,
117 .cra_blocksize = SHA384_BLOCK_SIZE,
118 .cra_ctxsize = sizeof(struct s390_sha_ctx),
119 .cra_module = THIS_MODULE,
120 }
121 };
122
123 MODULE_ALIAS_CRYPTO("sha384");
124
125 static int __init init(void)
126 {
127 int ret;
128
129 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512))
130 return -ENODEV;
131 if ((ret = crypto_register_shash(&sha512_alg)) < 0)
132 goto out;
133 if ((ret = crypto_register_shash(&sha384_alg)) < 0)
134 crypto_unregister_shash(&sha512_alg);
135 out:
136 return ret;
137 }
138
139 static void __exit fini(void)
140 {
141 crypto_unregister_shash(&sha512_alg);
142 crypto_unregister_shash(&sha384_alg);
143 }
144
145 module_cpu_feature_match(S390_CPU_FEATURE_MSA, init);
146 module_exit(fini);
147
148 MODULE_LICENSE("GPL");
149 MODULE_DESCRIPTION("SHA512 and SHA-384 Secure Hash Algorithm");
150
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