// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Key-agreement Protocol Primitives (KPP)
 *
 * Copyright (c) 2016, Intel Corporation
 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
 */

#include <crypto/internal/kpp.h>
#include <linux/cryptouser.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>

#include "internal.h"

static int __maybe_unused crypto_kpp_report(
        struct sk_buff *skb, struct crypto_alg *alg)
{
        struct crypto_report_kpp rkpp;

        memset(&rkpp, 0, sizeof(rkpp));

        strscpy(rkpp.type, "kpp", sizeof(rkpp.type));

        return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp);
}

static void __maybe_unused crypto_kpp_show(struct seq_file *m,
                                           struct crypto_alg *alg)
{
        seq_puts(m, "type         : kpp\n");
}

static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
{
        struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
        struct kpp_alg *alg = crypto_kpp_alg(kpp);

        alg->exit(kpp);
}

static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
{
        struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
        struct kpp_alg *alg = crypto_kpp_alg(kpp);

        if (alg->exit)
                kpp->base.exit = crypto_kpp_exit_tfm;

        if (alg->init)
                return alg->init(kpp);

        return 0;
}

static void crypto_kpp_free_instance(struct crypto_instance *inst)
{
        struct kpp_instance *kpp = kpp_instance(inst);

        kpp->free(kpp);
}

static const struct crypto_type crypto_kpp_type = {
        .extsize = crypto_alg_extsize,
        .init_tfm = crypto_kpp_init_tfm,
        .free = crypto_kpp_free_instance,
#ifdef CONFIG_PROC_FS
        .show = crypto_kpp_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
        .report = crypto_kpp_report,
#endif
        .maskclear = ~CRYPTO_ALG_TYPE_MASK,
        .maskset = CRYPTO_ALG_TYPE_MASK,
        .type = CRYPTO_ALG_TYPE_KPP,
        .tfmsize = offsetof(struct crypto_kpp, base),
        .algsize = offsetof(struct kpp_alg, base),
};

struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
{
        return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_kpp);

int crypto_grab_kpp(struct crypto_kpp_spawn *spawn,
                    struct crypto_instance *inst,
                    const char *name, u32 type, u32 mask)
{
        spawn->base.frontend = &crypto_kpp_type;
        return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_kpp);

int crypto_has_kpp(const char *alg_name, u32 type, u32 mask)
{
        return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_has_kpp);

static void kpp_prepare_alg(struct kpp_alg *alg)
{
        struct crypto_alg *base = &alg->base;

        base->cra_type = &crypto_kpp_type;
        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
        base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
}

int crypto_register_kpp(struct kpp_alg *alg)
{
        struct crypto_alg *base = &alg->base;

        kpp_prepare_alg(alg);
        return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_kpp);

void crypto_unregister_kpp(struct kpp_alg *alg)
{
        crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_kpp);

int kpp_register_instance(struct crypto_template *tmpl,
                          struct kpp_instance *inst)
{
        if (WARN_ON(!inst->free))
                return -EINVAL;

        kpp_prepare_alg(&inst->alg);

        return crypto_register_instance(tmpl, kpp_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(kpp_register_instance);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Key-agreement Protocol Primitives");