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
sha512_init(struct shash_desc * desc)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 ctx->first_message_part = 0;
36
37 return 0;
38 }
39
sha512_export(struct shash_desc * desc,void * out)40 static int sha512_export(struct shash_desc *desc, void *out)
41 {
42 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
43 struct sha512_state *octx = out;
44
45 octx->count[0] = sctx->count;
46 octx->count[1] = 0;
47 memcpy(octx->state, sctx->state, sizeof(octx->state));
48 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
49 return 0;
50 }
51
sha512_import(struct shash_desc * desc,const void * in)52 static int sha512_import(struct shash_desc *desc, const void *in)
53 {
54 struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
55 const struct sha512_state *ictx = in;
56
57 if (unlikely(ictx->count[1]))
58 return -ERANGE;
59 sctx->count = ictx->count[0];
60
61 memcpy(sctx->state, ictx->state, sizeof(ictx->state));
62 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
63 sctx->func = CPACF_KIMD_SHA_512;
64 sctx->first_message_part = 0;
65 return 0;
66 }
67
68 static struct shash_alg sha512_alg = {
69 .digestsize = SHA512_DIGEST_SIZE,
70 .init = sha512_init,
71 .update = s390_sha_update,
72 .final = s390_sha_final,
73 .export = sha512_export,
74 .import = sha512_import,
75 .descsize = sizeof(struct s390_sha_ctx),
76 .statesize = sizeof(struct sha512_state),
77 .base = {
78 .cra_name = "sha512",
79 .cra_driver_name= "sha512-s390",
80 .cra_priority = 300,
81 .cra_blocksize = SHA512_BLOCK_SIZE,
82 .cra_module = THIS_MODULE,
83 }
84 };
85
86 MODULE_ALIAS_CRYPTO("sha512");
87
sha384_init(struct shash_desc * desc)88 static int sha384_init(struct shash_desc *desc)
89 {
90 struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
91
92 *(__u64 *)&ctx->state[0] = SHA384_H0;
93 *(__u64 *)&ctx->state[2] = SHA384_H1;
94 *(__u64 *)&ctx->state[4] = SHA384_H2;
95 *(__u64 *)&ctx->state[6] = SHA384_H3;
96 *(__u64 *)&ctx->state[8] = SHA384_H4;
97 *(__u64 *)&ctx->state[10] = SHA384_H5;
98 *(__u64 *)&ctx->state[12] = SHA384_H6;
99 *(__u64 *)&ctx->state[14] = SHA384_H7;
100 ctx->count = 0;
101 ctx->func = CPACF_KIMD_SHA_512;
102 ctx->first_message_part = 0;
103
104 return 0;
105 }
106
107 static struct shash_alg sha384_alg = {
108 .digestsize = SHA384_DIGEST_SIZE,
109 .init = sha384_init,
110 .update = s390_sha_update,
111 .final = s390_sha_final,
112 .export = sha512_export,
113 .import = sha512_import,
114 .descsize = sizeof(struct s390_sha_ctx),
115 .statesize = sizeof(struct sha512_state),
116 .base = {
117 .cra_name = "sha384",
118 .cra_driver_name= "sha384-s390",
119 .cra_priority = 300,
120 .cra_blocksize = SHA384_BLOCK_SIZE,
121 .cra_ctxsize = sizeof(struct s390_sha_ctx),
122 .cra_module = THIS_MODULE,
123 }
124 };
125
126 MODULE_ALIAS_CRYPTO("sha384");
127
init(void)128 static int __init init(void)
129 {
130 int ret;
131
132 if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512))
133 return -ENODEV;
134 if ((ret = crypto_register_shash(&sha512_alg)) < 0)
135 goto out;
136 if ((ret = crypto_register_shash(&sha384_alg)) < 0)
137 crypto_unregister_shash(&sha512_alg);
138 out:
139 return ret;
140 }
141
fini(void)142 static void __exit fini(void)
143 {
144 crypto_unregister_shash(&sha512_alg);
145 crypto_unregister_shash(&sha384_alg);
146 }
147
148 module_cpu_feature_match(S390_CPU_FEATURE_MSA, init);
149 module_exit(fini);
150
151 MODULE_LICENSE("GPL");
152 MODULE_DESCRIPTION("SHA512 and SHA-384 Secure Hash Algorithm");
153