1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Key-agreement Protocol Primitives (KPP)
4 *
5 * Copyright (c) 2016, Intel Corporation
6 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
7 */
8
9 #include <crypto/internal/kpp.h>
10 #include <linux/cryptouser.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/seq_file.h>
15 #include <linux/string.h>
16 #include <net/netlink.h>
17
18 #include "internal.h"
19
20 static int __maybe_unused crypto_kpp_report(
21 struct sk_buff *skb, struct crypto_alg *alg)
22 {
23 struct crypto_report_kpp rkpp;
24
25 memset(&rkpp, 0, sizeof(rkpp));
26
27 strscpy(rkpp.type, "kpp", sizeof(rkpp.type));
28
29 return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp);
30 }
31
32 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
33 __maybe_unused;
34
35 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
36 {
37 seq_puts(m, "type : kpp\n");
38 }
39
40 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
41 {
42 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
43 struct kpp_alg *alg = crypto_kpp_alg(kpp);
44
45 alg->exit(kpp);
46 }
47
48 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
49 {
50 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
51 struct kpp_alg *alg = crypto_kpp_alg(kpp);
52
53 if (alg->exit)
54 kpp->base.exit = crypto_kpp_exit_tfm;
55
56 if (alg->init)
57 return alg->init(kpp);
58
59 return 0;
60 }
61
62 static void crypto_kpp_free_instance(struct crypto_instance *inst)
63 {
64 struct kpp_instance *kpp = kpp_instance(inst);
65
66 kpp->free(kpp);
67 }
68
69 static const struct crypto_type crypto_kpp_type = {
70 .extsize = crypto_alg_extsize,
71 .init_tfm = crypto_kpp_init_tfm,
72 .free = crypto_kpp_free_instance,
73 #ifdef CONFIG_PROC_FS
74 .show = crypto_kpp_show,
75 #endif
76 #if IS_ENABLED(CONFIG_CRYPTO_USER)
77 .report = crypto_kpp_report,
78 #endif
79 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
80 .maskset = CRYPTO_ALG_TYPE_MASK,
81 .type = CRYPTO_ALG_TYPE_KPP,
82 .tfmsize = offsetof(struct crypto_kpp, base),
83 };
84
85 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
86 {
87 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
88 }
89 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
90
91 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn,
92 struct crypto_instance *inst,
93 const char *name, u32 type, u32 mask)
94 {
95 spawn->base.frontend = &crypto_kpp_type;
96 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
97 }
98 EXPORT_SYMBOL_GPL(crypto_grab_kpp);
99
100 int crypto_has_kpp(const char *alg_name, u32 type, u32 mask)
101 {
102 return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask);
103 }
104 EXPORT_SYMBOL_GPL(crypto_has_kpp);
105
106 static void kpp_prepare_alg(struct kpp_alg *alg)
107 {
108 struct crypto_alg *base = &alg->base;
109
110 base->cra_type = &crypto_kpp_type;
111 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
112 base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
113 }
114
115 int crypto_register_kpp(struct kpp_alg *alg)
116 {
117 struct crypto_alg *base = &alg->base;
118
119 kpp_prepare_alg(alg);
120 return crypto_register_alg(base);
121 }
122 EXPORT_SYMBOL_GPL(crypto_register_kpp);
123
124 void crypto_unregister_kpp(struct kpp_alg *alg)
125 {
126 crypto_unregister_alg(&alg->base);
127 }
128 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
129
130 int kpp_register_instance(struct crypto_template *tmpl,
131 struct kpp_instance *inst)
132 {
133 if (WARN_ON(!inst->free))
134 return -EINVAL;
135
136 kpp_prepare_alg(&inst->alg);
137
138 return crypto_register_instance(tmpl, kpp_crypto_instance(inst));
139 }
140 EXPORT_SYMBOL_GPL(kpp_register_instance);
141
142 MODULE_LICENSE("GPL");
143 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
144
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