linux/crypto/kpp.c
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   1/*
   2 * Key-agreement Protocol Primitives (KPP)
   3 *
   4 * Copyright (c) 2016, Intel Corporation
   5 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License as published by the Free
   9 * Software Foundation; either version 2 of the License, or (at your option)
  10 * any later version.
  11 *
  12 */
  13#include <linux/errno.h>
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/seq_file.h>
  17#include <linux/slab.h>
  18#include <linux/string.h>
  19#include <linux/crypto.h>
  20#include <crypto/algapi.h>
  21#include <linux/cryptouser.h>
  22#include <net/netlink.h>
  23#include <crypto/kpp.h>
  24#include <crypto/internal/kpp.h>
  25#include "internal.h"
  26
  27#ifdef CONFIG_NET
  28static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  29{
  30        struct crypto_report_kpp rkpp;
  31
  32        strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
  33
  34        if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
  35                    sizeof(struct crypto_report_kpp), &rkpp))
  36                goto nla_put_failure;
  37        return 0;
  38
  39nla_put_failure:
  40        return -EMSGSIZE;
  41}
  42#else
  43static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  44{
  45        return -ENOSYS;
  46}
  47#endif
  48
  49static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  50        __attribute__ ((unused));
  51
  52static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  53{
  54        seq_puts(m, "type         : kpp\n");
  55}
  56
  57static void crypto_kpp_exit_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        alg->exit(kpp);
  63}
  64
  65static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
  66{
  67        struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  68        struct kpp_alg *alg = crypto_kpp_alg(kpp);
  69
  70        if (alg->exit)
  71                kpp->base.exit = crypto_kpp_exit_tfm;
  72
  73        if (alg->init)
  74                return alg->init(kpp);
  75
  76        return 0;
  77}
  78
  79static const struct crypto_type crypto_kpp_type = {
  80        .extsize = crypto_alg_extsize,
  81        .init_tfm = crypto_kpp_init_tfm,
  82#ifdef CONFIG_PROC_FS
  83        .show = crypto_kpp_show,
  84#endif
  85        .report = crypto_kpp_report,
  86        .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  87        .maskset = CRYPTO_ALG_TYPE_MASK,
  88        .type = CRYPTO_ALG_TYPE_KPP,
  89        .tfmsize = offsetof(struct crypto_kpp, base),
  90};
  91
  92struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
  93{
  94        return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
  95}
  96EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  97
  98static void kpp_prepare_alg(struct kpp_alg *alg)
  99{
 100        struct crypto_alg *base = &alg->base;
 101
 102        base->cra_type = &crypto_kpp_type;
 103        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 104        base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
 105}
 106
 107int crypto_register_kpp(struct kpp_alg *alg)
 108{
 109        struct crypto_alg *base = &alg->base;
 110
 111        kpp_prepare_alg(alg);
 112        return crypto_register_alg(base);
 113}
 114EXPORT_SYMBOL_GPL(crypto_register_kpp);
 115
 116void crypto_unregister_kpp(struct kpp_alg *alg)
 117{
 118        crypto_unregister_alg(&alg->base);
 119}
 120EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 121
 122MODULE_LICENSE("GPL");
 123MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
 124