crypto/kpp.c

   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 #include <linux/errno.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/slab.h>
  13 #include <linux/string.h>
  14 #include <linux/crypto.h>
  15 #include <crypto/algapi.h>
  16 #include <linux/cryptouser.h>
  17 #include <linux/compiler.h>
  18 #include <net/netlink.h>
  19 #include <crypto/kpp.h>
  20 #include <crypto/internal/kpp.h>
  21 #include "internal.h"
  22
  23 #ifdef CONFIG_NET
  24 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  25 {
  26         struct crypto_report_kpp rkpp;
  27
  28         memset(&rkpp, 0, sizeof(rkpp));
  29
  30         strscpy(rkpp.type, "kpp", sizeof(rkpp.type));
  31
  32         return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp);
  33 }
  34 #else
  35 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
  36 {
  37         return -ENOSYS;
  38 }
  39 #endif
  40
  41 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  42         __maybe_unused;
  43
  44 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  45 {
  46         seq_puts(m, "type         : kpp\n");
  47 }
  48
  49 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
  50 {
  51         struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  52         struct kpp_alg *alg = crypto_kpp_alg(kpp);
  53
  54         alg->exit(kpp);
  55 }
  56
  57 static int crypto_kpp_init_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         if (alg->exit)
  63                 kpp->base.exit = crypto_kpp_exit_tfm;
  64
  65         if (alg->init)
  66                 return alg->init(kpp);
  67
  68         return 0;
  69 }
  70
  71 static const struct crypto_type crypto_kpp_type = {
  72         .extsize = crypto_alg_extsize,
  73         .init_tfm = crypto_kpp_init_tfm,
  74 #ifdef CONFIG_PROC_FS
  75         .show = crypto_kpp_show,
  76 #endif
  77         .report = crypto_kpp_report,
  78         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  79         .maskset = CRYPTO_ALG_TYPE_MASK,
  80         .type = CRYPTO_ALG_TYPE_KPP,
  81         .tfmsize = offsetof(struct crypto_kpp, base),
  82 };
  83
  84 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
  85 {
  86         return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
  87 }
  88 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  89
  90 static void kpp_prepare_alg(struct kpp_alg *alg)
  91 {
  92         struct crypto_alg *base = &alg->base;
  93
  94         base->cra_type = &crypto_kpp_type;
  95         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  96         base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
  97 }
  98
  99 int crypto_register_kpp(struct kpp_alg *alg)
 100 {
 101         struct crypto_alg *base = &alg->base;
 102
 103         kpp_prepare_alg(alg);
 104         return crypto_register_alg(base);
 105 }
 106 EXPORT_SYMBOL_GPL(crypto_register_kpp);
 107
 108 void crypto_unregister_kpp(struct kpp_alg *alg)
 109 {
 110         crypto_unregister_alg(&alg->base);
 111 }
 112 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 113
 114 MODULE_LICENSE("GPL");
 115 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");