LXR linux/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
  29static 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
  40nla_put_failure:
  41        return -EMSGSIZE;
  42}
  43#else
  44static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  45{
  46        return -ENOSYS;
  47}
  48#endif
  49
  50static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  51        __maybe_unused;
  52
  53static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  54{
  55        seq_puts(m, "type         : akcipher\n");
  56}
  57
  58static 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
  66static 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
  80static 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
  87static 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
 101int 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}
 107EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 108
 109struct 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}
 114EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
 115
 116static 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
 125int 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}
 132EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 133
 134void crypto_unregister_akcipher(struct akcipher_alg *alg)
 135{
 136        crypto_unregister_alg(&alg->base);
 137}
 138EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 139
 140int 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}
 146EXPORT_SYMBOL_GPL(akcipher_register_instance);
 147
 148MODULE_LICENSE("GPL");
 149MODULE_DESCRIPTION("Generic public key cipher type");
 150