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
   9 #include <crypto/internal/kpp.h>
  10 #include <linux/cryptouser.h>
  11 #include <linux/errno.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/string.h>
  16 #include <net/netlink.h>
  17
  18 #include "internal.h"
  19
  20 static int __maybe_unused crypto_kpp_report(
  21         struct sk_buff *skb, struct crypto_alg *alg)
  22 {
  23         struct crypto_report_kpp rkpp;
  24
  25         memset(&rkpp, 0, sizeof(rkpp));
  26
  27         strscpy(rkpp.type, "kpp", sizeof(rkpp.type));
  28
  29         return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp);
  30 }
  31
  32 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  33         __maybe_unused;
  34
  35 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
  36 {
  37         seq_puts(m, "type         : kpp\n");
  38 }
  39
  40 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
  41 {
  42         struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  43         struct kpp_alg *alg = crypto_kpp_alg(kpp);
  44
  45         alg->exit(kpp);
  46 }
  47
  48 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
  49 {
  50         struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
  51         struct kpp_alg *alg = crypto_kpp_alg(kpp);
  52
  53         if (alg->exit)
  54                 kpp->base.exit = crypto_kpp_exit_tfm;
  55
  56         if (alg->init)
  57                 return alg->init(kpp);
  58
  59         return 0;
  60 }
  61
  62 static void crypto_kpp_free_instance(struct crypto_instance *inst)
  63 {
  64         struct kpp_instance *kpp = kpp_instance(inst);
  65
  66         kpp->free(kpp);
  67 }
  68
  69 static const struct crypto_type crypto_kpp_type = {
  70         .extsize = crypto_alg_extsize,
  71         .init_tfm = crypto_kpp_init_tfm,
  72         .free = crypto_kpp_free_instance,
  73 #ifdef CONFIG_PROC_FS
  74         .show = crypto_kpp_show,
  75 #endif
  76 #if IS_ENABLED(CONFIG_CRYPTO_USER)
  77         .report = crypto_kpp_report,
  78 #endif
  79         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  80         .maskset = CRYPTO_ALG_TYPE_MASK,
  81         .type = CRYPTO_ALG_TYPE_KPP,
  82         .tfmsize = offsetof(struct crypto_kpp, base),
  83 };
  84
  85 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
  86 {
  87         return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
  88 }
  89 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  90
  91 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn,
  92                     struct crypto_instance *inst,
  93                     const char *name, u32 type, u32 mask)
  94 {
  95         spawn->base.frontend = &crypto_kpp_type;
  96         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
  97 }
  98 EXPORT_SYMBOL_GPL(crypto_grab_kpp);
  99
 100 int crypto_has_kpp(const char *alg_name, u32 type, u32 mask)
 101 {
 102         return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask);
 103 }
 104 EXPORT_SYMBOL_GPL(crypto_has_kpp);
 105
 106 static void kpp_prepare_alg(struct kpp_alg *alg)
 107 {
 108         struct crypto_alg *base = &alg->base;
 109
 110         base->cra_type = &crypto_kpp_type;
 111         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 112         base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
 113 }
 114
 115 int crypto_register_kpp(struct kpp_alg *alg)
 116 {
 117         struct crypto_alg *base = &alg->base;
 118
 119         kpp_prepare_alg(alg);
 120         return crypto_register_alg(base);
 121 }
 122 EXPORT_SYMBOL_GPL(crypto_register_kpp);
 123
 124 void crypto_unregister_kpp(struct kpp_alg *alg)
 125 {
 126         crypto_unregister_alg(&alg->base);
 127 }
 128 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
 129
 130 int kpp_register_instance(struct crypto_template *tmpl,
 131                           struct kpp_instance *inst)
 132 {
 133         if (WARN_ON(!inst->free))
 134                 return -EINVAL;
 135
 136         kpp_prepare_alg(&inst->alg);
 137
 138         return crypto_register_instance(tmpl, kpp_crypto_instance(inst));
 139 }
 140 EXPORT_SYMBOL_GPL(kpp_register_instance);
 141
 142 MODULE_LICENSE("GPL");
 143 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");