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