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 #include <linux/errno.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/seq_file.h>
12 #include <linux/slab.h>
13 #include <linux/string.h>
14 #include <linux/crypto.h>
15 #include <crypto/algapi.h>
16 #include <linux/cryptouser.h>
17 #include <linux/compiler.h>
18 #include <net/netlink.h>
19 #include <crypto/kpp.h>
20 #include <crypto/internal/kpp.h>
21 #include "internal.h"
22 
23 #ifdef CONFIG_NET
crypto_kpp_report(struct sk_buff * skb,struct crypto_alg * alg)24 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
25 {
26 	struct crypto_report_kpp rkpp;
27 
28 	memset(&rkpp, 0, sizeof(rkpp));
29 
30 	strscpy(rkpp.type, "kpp", sizeof(rkpp.type));
31 
32 	return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp);
33 }
34 #else
crypto_kpp_report(struct sk_buff * skb,struct crypto_alg * alg)35 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
36 {
37 	return -ENOSYS;
38 }
39 #endif
40 
41 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
42 	__maybe_unused;
43 
crypto_kpp_show(struct seq_file * m,struct crypto_alg * alg)44 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
45 {
46 	seq_puts(m, "type         : kpp\n");
47 }
48 
crypto_kpp_exit_tfm(struct crypto_tfm * tfm)49 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
50 {
51 	struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
52 	struct kpp_alg *alg = crypto_kpp_alg(kpp);
53 
54 	alg->exit(kpp);
55 }
56 
crypto_kpp_init_tfm(struct crypto_tfm * tfm)57 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
58 {
59 	struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
60 	struct kpp_alg *alg = crypto_kpp_alg(kpp);
61 
62 	if (alg->exit)
63 		kpp->base.exit = crypto_kpp_exit_tfm;
64 
65 	if (alg->init)
66 		return alg->init(kpp);
67 
68 	return 0;
69 }
70 
71 static const struct crypto_type crypto_kpp_type = {
72 	.extsize = crypto_alg_extsize,
73 	.init_tfm = crypto_kpp_init_tfm,
74 #ifdef CONFIG_PROC_FS
75 	.show = crypto_kpp_show,
76 #endif
77 	.report = crypto_kpp_report,
78 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
79 	.maskset = CRYPTO_ALG_TYPE_MASK,
80 	.type = CRYPTO_ALG_TYPE_KPP,
81 	.tfmsize = offsetof(struct crypto_kpp, base),
82 };
83 
crypto_alloc_kpp(const char * alg_name,u32 type,u32 mask)84 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
85 {
86 	return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
87 }
88 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
89 
kpp_prepare_alg(struct kpp_alg * alg)90 static void kpp_prepare_alg(struct kpp_alg *alg)
91 {
92 	struct crypto_alg *base = &alg->base;
93 
94 	base->cra_type = &crypto_kpp_type;
95 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
96 	base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
97 }
98 
crypto_register_kpp(struct kpp_alg * alg)99 int crypto_register_kpp(struct kpp_alg *alg)
100 {
101 	struct crypto_alg *base = &alg->base;
102 
103 	kpp_prepare_alg(alg);
104 	return crypto_register_alg(base);
105 }
106 EXPORT_SYMBOL_GPL(crypto_register_kpp);
107 
crypto_unregister_kpp(struct kpp_alg * alg)108 void crypto_unregister_kpp(struct kpp_alg *alg)
109 {
110 	crypto_unregister_alg(&alg->base);
111 }
112 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
113 
114 MODULE_LICENSE("GPL");
115 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
116