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
  29 static 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
  40 nla_put_failure:
  41         return -EMSGSIZE;
  42 }
  43 #else
  44 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  45 {
  46         return -ENOSYS;
  47 }
  48 #endif
  49
  50 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  51         __maybe_unused;
  52
  53 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  54 {
  55         seq_puts(m, "type         : kpp\n");
  56 }
  57
  58 static 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
  66 static 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
  80 static 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
  93 struct 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 }
  97 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  98
  99 static 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
 108 int 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 }
 115 EXPORT_SYMBOL_GPL(crypto_register_kpp);
 116
 117 void crypto_unregister_kpp(struct kpp_alg *alg)
 118 {
 119         crypto_unregister_alg(&alg->base);
 120 }
 121 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 122
 123 MODULE_LICENSE("GPL");
 124 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");