crypto/akcipher.c

   1 /*
   2  * Public Key Encryption
   3  *
   4  * Copyright (c) 2015, Intel Corporation
   5  * Authors: Tadeusz Struk <tadeusz.struk@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 <linux/compiler.h>
  21 #include <crypto/algapi.h>
  22 #include <linux/cryptouser.h>
  23 #include <net/netlink.h>
  24 #include <crypto/akcipher.h>
  25 #include <crypto/internal/akcipher.h>
  26 #include "internal.h"
  27
  28 #ifdef CONFIG_NET
  29 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  30 {
  31         struct crypto_report_akcipher rakcipher;
  32
  33         strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
  34
  35         if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
  36                     sizeof(struct crypto_report_akcipher), &rakcipher))
  37                 goto nla_put_failure;
  38         return 0;
  39
  40 nla_put_failure:
  41         return -EMSGSIZE;
  42 }
  43 #else
  44 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  45 {
  46         return -ENOSYS;
  47 }
  48 #endif
  49
  50 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  51         __maybe_unused;
  52
  53 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  54 {
  55         seq_puts(m, "type         : akcipher\n");
  56 }
  57
  58 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
  59 {
  60         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
  61         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
  62
  63         alg->exit(akcipher);
  64 }
  65
  66 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
  67 {
  68         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
  69         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
  70
  71         if (alg->exit)
  72                 akcipher->base.exit = crypto_akcipher_exit_tfm;
  73
  74         if (alg->init)
  75                 return alg->init(akcipher);
  76
  77         return 0;
  78 }
  79
  80 static void crypto_akcipher_free_instance(struct crypto_instance *inst)
  81 {
  82         struct akcipher_instance *akcipher = akcipher_instance(inst);
  83
  84         akcipher->free(akcipher);
  85 }
  86
  87 static const struct crypto_type crypto_akcipher_type = {
  88         .extsize = crypto_alg_extsize,
  89         .init_tfm = crypto_akcipher_init_tfm,
  90         .free = crypto_akcipher_free_instance,
  91 #ifdef CONFIG_PROC_FS
  92         .show = crypto_akcipher_show,
  93 #endif
  94         .report = crypto_akcipher_report,
  95         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  96         .maskset = CRYPTO_ALG_TYPE_MASK,
  97         .type = CRYPTO_ALG_TYPE_AKCIPHER,
  98         .tfmsize = offsetof(struct crypto_akcipher, base),
  99 };
 100
 101 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
 102                          u32 type, u32 mask)
 103 {
 104         spawn->base.frontend = &crypto_akcipher_type;
 105         return crypto_grab_spawn(&spawn->base, name, type, mask);
 106 }
 107 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 108
 109 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
 110                                               u32 mask)
 111 {
 112         return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
 113 }
 114 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
 115
 116 static void akcipher_prepare_alg(struct akcipher_alg *alg)
 117 {
 118         struct crypto_alg *base = &alg->base;
 119
 120         base->cra_type = &crypto_akcipher_type;
 121         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 122         base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
 123 }
 124
 125 int crypto_register_akcipher(struct akcipher_alg *alg)
 126 {
 127         struct crypto_alg *base = &alg->base;
 128
 129         akcipher_prepare_alg(alg);
 130         return crypto_register_alg(base);
 131 }
 132 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 133
 134 void crypto_unregister_akcipher(struct akcipher_alg *alg)
 135 {
 136         crypto_unregister_alg(&alg->base);
 137 }
 138 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 139
 140 int akcipher_register_instance(struct crypto_template *tmpl,
 141                                struct akcipher_instance *inst)
 142 {
 143         akcipher_prepare_alg(&inst->alg);
 144         return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
 145 }
 146 EXPORT_SYMBOL_GPL(akcipher_register_instance);
 147
 148 MODULE_LICENSE("GPL");
 149 MODULE_DESCRIPTION("Generic public key cipher type");