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