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/internal/akcipher.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 void crypto_akcipher_free_instance(struct crypto_instance *inst)
  80 {
  81         struct akcipher_instance *akcipher = akcipher_instance(inst);
  82
  83         akcipher->free(akcipher);
  84 }
  85
  86 static const struct crypto_type crypto_akcipher_type = {
  87         .extsize = crypto_alg_extsize,
  88         .init_tfm = crypto_akcipher_init_tfm,
  89         .free = crypto_akcipher_free_instance,
  90 #ifdef CONFIG_PROC_FS
  91         .show = crypto_akcipher_show,
  92 #endif
  93         .report = crypto_akcipher_report,
  94         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  95         .maskset = CRYPTO_ALG_TYPE_MASK,
  96         .type = CRYPTO_ALG_TYPE_AKCIPHER,
  97         .tfmsize = offsetof(struct crypto_akcipher, base),
  98 };
  99
 100 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
 101                          u32 type, u32 mask)
 102 {
 103         spawn->base.frontend = &crypto_akcipher_type;
 104         return crypto_grab_spawn(&spawn->base, name, type, mask);
 105 }
 106 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 107
 108 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
 109                                               u32 mask)
 110 {
 111         return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
 112 }
 113 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
 114
 115 static void akcipher_prepare_alg(struct akcipher_alg *alg)
 116 {
 117         struct crypto_alg *base = &alg->base;
 118
 119         base->cra_type = &crypto_akcipher_type;
 120         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 121         base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
 122 }
 123
 124 int crypto_register_akcipher(struct akcipher_alg *alg)
 125 {
 126         struct crypto_alg *base = &alg->base;
 127
 128         akcipher_prepare_alg(alg);
 129         return crypto_register_alg(base);
 130 }
 131 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 132
 133 void crypto_unregister_akcipher(struct akcipher_alg *alg)
 134 {
 135         crypto_unregister_alg(&alg->base);
 136 }
 137 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 138
 139 int akcipher_register_instance(struct crypto_template *tmpl,
 140                                struct akcipher_instance *inst)
 141 {
 142         akcipher_prepare_alg(&inst->alg);
 143         return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
 144 }
 145 EXPORT_SYMBOL_GPL(akcipher_register_instance);
 146
 147 MODULE_LICENSE("GPL");
 148 MODULE_DESCRIPTION("Generic public key cipher type");