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 <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
  28static 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
  39nla_put_failure:
  40        return -EMSGSIZE;
  41}
  42#else
  43static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  44{
  45        return -ENOSYS;
  46}
  47#endif
  48
  49static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  50        __attribute__ ((unused));
  51
  52static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  53{
  54        seq_puts(m, "type         : akcipher\n");
  55}
  56
  57static 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
  65static 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
  79static 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
  86static 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
 100int 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}
 106EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 107
 108struct 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}
 113EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
 114
 115static 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
 124int 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}
 131EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 132
 133void crypto_unregister_akcipher(struct akcipher_alg *alg)
 134{
 135        crypto_unregister_alg(&alg->base);
 136}
 137EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 138
 139int 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}
 145EXPORT_SYMBOL_GPL(akcipher_register_instance);
 146
 147MODULE_LICENSE("GPL");
 148MODULE_DESCRIPTION("Generic public key cipher type");
 149