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");