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
20static 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
32static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
33	__maybe_unused;
34
35static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
36{
37	seq_puts(m, "type         : kpp\n");
38}
39
40static 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
48static 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
62static 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
69static 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
85struct 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}
89EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
90
91int 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}
98EXPORT_SYMBOL_GPL(crypto_grab_kpp);
99
100int 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}
104EXPORT_SYMBOL_GPL(crypto_has_kpp);
105
106static 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
115int 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}
122EXPORT_SYMBOL_GPL(crypto_register_kpp);
123
124void crypto_unregister_kpp(struct kpp_alg *alg)
125{
126	crypto_unregister_alg(&alg->base);
127}
128EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
129
130int 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}
140EXPORT_SYMBOL_GPL(kpp_register_instance);
141
142MODULE_LICENSE("GPL");
143MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
144