LXR linux/crypto/kpp.c

   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 <linux/compiler.h>
  23#include <net/netlink.h>
  24#include <crypto/kpp.h>
  25#include <crypto/internal/kpp.h>
  26#include "internal.h"
  27
  28#ifdef CONFIG_NET
  29static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  30{
  31        struct crypto_report_kpp rkpp;
  32
  33        strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
  34
  35        if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
  36                    sizeof(struct crypto_report_kpp), &rkpp))
  37                goto nla_put_failure;
  38        return 0;
  39
  40nla_put_failure:
  41        return -EMSGSIZE;
  42}
  43#else
  44static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  45{
  46        return -ENOSYS;
  47}
  48#endif
  49
  50static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  51        __maybe_unused;
  52
  53static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  54{
  55        seq_puts(m, "type         : kpp\n");
  56}
  57
  58static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
  59{
  60        struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  61        struct kpp_alg *alg = crypto_kpp_alg(kpp);
  62
  63        alg->exit(kpp);
  64}
  65
  66static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
  67{
  68        struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  69        struct kpp_alg *alg = crypto_kpp_alg(kpp);
  70
  71        if (alg->exit)
  72                kpp->base.exit = crypto_kpp_exit_tfm;
  73
  74        if (alg->init)
  75                return alg->init(kpp);
  76
  77        return 0;
  78}
  79
  80static const struct crypto_type crypto_kpp_type = {
  81        .extsize = crypto_alg_extsize,
  82        .init_tfm = crypto_kpp_init_tfm,
  83#ifdef CONFIG_PROC_FS
  84        .show = crypto_kpp_show,
  85#endif
  86        .report = crypto_kpp_report,
  87        .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  88        .maskset = CRYPTO_ALG_TYPE_MASK,
  89        .type = CRYPTO_ALG_TYPE_KPP,
  90        .tfmsize = offsetof(struct crypto_kpp, base),
  91};
  92
  93struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
  94{
  95        return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
  96}
  97EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  98
  99static void kpp_prepare_alg(struct kpp_alg *alg)
 100{
 101        struct crypto_alg *base = &alg->base;
 102
 103        base->cra_type = &crypto_kpp_type;
 104        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 105        base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
 106}
 107
 108int crypto_register_kpp(struct kpp_alg *alg)
 109{
 110        struct crypto_alg *base = &alg->base;
 111
 112        kpp_prepare_alg(alg);
 113        return crypto_register_alg(base);
 114}
 115EXPORT_SYMBOL_GPL(crypto_register_kpp);
 116
 117void crypto_unregister_kpp(struct kpp_alg *alg)
 118{
 119        crypto_unregister_alg(&alg->base);
 120}
 121EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 122
 123MODULE_LICENSE("GPL");
 124MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
 125