xref: /linux/crypto/kpp.c (revision 90d32e92011eaae8e70a9169b4e7acf4ca8f9d3a)
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