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 <crypto/algapi.h>
  21 #include <linux/cryptouser.h>
  22 #include <net/netlink.h>
  23 #include <crypto/akcipher.h>
  24 #include "internal.h"
  25
  26 #ifdef CONFIG_NET
  27 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  28 {
  29         struct crypto_report_akcipher rakcipher;
  30
  31         strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
  32
  33         if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
  34                     sizeof(struct crypto_report_akcipher), &rakcipher))
  35                 goto nla_put_failure;
  36         return 0;
  37
  38 nla_put_failure:
  39         return -EMSGSIZE;
  40 }
  41 #else
  42 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  43 {
  44         return -ENOSYS;
  45 }
  46 #endif
  47
  48 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  49         __attribute__ ((unused));
  50
  51 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  52 {
  53         seq_puts(m, "type         : akcipher\n");
  54 }
  55
  56 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
  57 {
  58         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
  59         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
  60
  61         alg->exit(akcipher);
  62 }
  63
  64 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
  65 {
  66         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
  67         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
  68
  69         if (alg->exit)
  70                 akcipher->base.exit = crypto_akcipher_exit_tfm;
  71
  72         if (alg->init)
  73                 return alg->init(akcipher);
  74
  75         return 0;
  76 }
  77
  78 static const struct crypto_type crypto_akcipher_type = {
  79         .extsize = crypto_alg_extsize,
  80         .init_tfm = crypto_akcipher_init_tfm,
  81 #ifdef CONFIG_PROC_FS
  82         .show = crypto_akcipher_show,
  83 #endif
  84         .report = crypto_akcipher_report,
  85         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  86         .maskset = CRYPTO_ALG_TYPE_MASK,
  87         .type = CRYPTO_ALG_TYPE_AKCIPHER,
  88         .tfmsize = offsetof(struct crypto_akcipher, base),
  89 };
  90
  91 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
  92                                               u32 mask)
  93 {
  94         return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
  95 }
  96 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
  97
  98 int crypto_register_akcipher(struct akcipher_alg *alg)
  99 {
 100         struct crypto_alg *base = &alg->base;
 101
 102         base->cra_type = &crypto_akcipher_type;
 103         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 104         base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
 105         return crypto_register_alg(base);
 106 }
 107 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 108
 109 void crypto_unregister_akcipher(struct akcipher_alg *alg)
 110 {
 111         crypto_unregister_alg(&alg->base);
 112 }
 113 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 114
 115 MODULE_LICENSE("GPL");
 116 MODULE_DESCRIPTION("Generic public key cipher type");