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 void crypto_kpp_free_instance(struct crypto_instance *inst)
  72 {
  73         struct kpp_instance *kpp = kpp_instance(inst);
  74
  75         kpp->free(kpp);
  76 }
  77
  78 static const struct crypto_type crypto_kpp_type = {
  79         .extsize = crypto_alg_extsize,
  80         .init_tfm = crypto_kpp_init_tfm,
  81         .free = crypto_kpp_free_instance,
  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
  92 struct 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 }
  96 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  97
  98 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn,
  99                     struct crypto_instance *inst,
 100                     const char *name, u32 type, u32 mask)
 101 {
 102         spawn->base.frontend = &crypto_kpp_type;
 103         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 104 }
 105 EXPORT_SYMBOL_GPL(crypto_grab_kpp);
 106
 107 static void kpp_prepare_alg(struct kpp_alg *alg)
 108 {
 109         struct crypto_alg *base = &alg->base;
 110
 111         base->cra_type = &crypto_kpp_type;
 112         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 113         base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
 114 }
 115
 116 int crypto_register_kpp(struct kpp_alg *alg)
 117 {
 118         struct crypto_alg *base = &alg->base;
 119
 120         kpp_prepare_alg(alg);
 121         return crypto_register_alg(base);
 122 }
 123 EXPORT_SYMBOL_GPL(crypto_register_kpp);
 124
 125 void crypto_unregister_kpp(struct kpp_alg *alg)
 126 {
 127         crypto_unregister_alg(&alg->base);
 128 }
 129 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 130
 131 int kpp_register_instance(struct crypto_template *tmpl,
 132                           struct kpp_instance *inst)
 133 {
 134         if (WARN_ON(!inst->free))
 135                 return -EINVAL;
 136
 137         kpp_prepare_alg(&inst->alg);
 138
 139         return crypto_register_instance(tmpl, kpp_crypto_instance(inst));
 140 }
 141 EXPORT_SYMBOL_GPL(kpp_register_instance);
 142
 143 MODULE_LICENSE("GPL");
 144 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");