linux/crypto/akcipher.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Public Key Encryption
   4 *
   5 * Copyright (c) 2015, Intel Corporation
   6 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
   7 */
   8#include <linux/errno.h>
   9#include <linux/kernel.h>
  10#include <linux/module.h>
  11#include <linux/seq_file.h>
  12#include <linux/slab.h>
  13#include <linux/string.h>
  14#include <linux/crypto.h>
  15#include <linux/compiler.h>
  16#include <crypto/algapi.h>
  17#include <linux/cryptouser.h>
  18#include <net/netlink.h>
  19#include <crypto/akcipher.h>
  20#include <crypto/internal/akcipher.h>
  21#include "internal.h"
  22
  23#ifdef CONFIG_NET
  24static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  25{
  26        struct crypto_report_akcipher rakcipher;
  27
  28        memset(&rakcipher, 0, sizeof(rakcipher));
  29
  30        strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
  31
  32        return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
  33                       sizeof(rakcipher), &rakcipher);
  34}
  35#else
  36static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  37{
  38        return -ENOSYS;
  39}
  40#endif
  41
  42static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  43        __maybe_unused;
  44
  45static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
  46{
  47        seq_puts(m, "type         : akcipher\n");
  48}
  49
  50static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
  51{
  52        struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
  53        struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
  54
  55        alg->exit(akcipher);
  56}
  57
  58static int crypto_akcipher_init_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        if (alg->exit)
  64                akcipher->base.exit = crypto_akcipher_exit_tfm;
  65
  66        if (alg->init)
  67                return alg->init(akcipher);
  68
  69        return 0;
  70}
  71
  72static void crypto_akcipher_free_instance(struct crypto_instance *inst)
  73{
  74        struct akcipher_instance *akcipher = akcipher_instance(inst);
  75
  76        akcipher->free(akcipher);
  77}
  78
  79static const struct crypto_type crypto_akcipher_type = {
  80        .extsize = crypto_alg_extsize,
  81        .init_tfm = crypto_akcipher_init_tfm,
  82        .free = crypto_akcipher_free_instance,
  83#ifdef CONFIG_PROC_FS
  84        .show = crypto_akcipher_show,
  85#endif
  86        .report = crypto_akcipher_report,
  87        .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  88        .maskset = CRYPTO_ALG_TYPE_MASK,
  89        .type = CRYPTO_ALG_TYPE_AKCIPHER,
  90        .tfmsize = offsetof(struct crypto_akcipher, base),
  91};
  92
  93int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
  94                         struct crypto_instance *inst,
  95                         const char *name, u32 type, u32 mask)
  96{
  97        spawn->base.frontend = &crypto_akcipher_type;
  98        return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
  99}
 100EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 101
 102struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
 103                                              u32 mask)
 104{
 105        return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
 106}
 107EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
 108
 109static void akcipher_prepare_alg(struct akcipher_alg *alg)
 110{
 111        struct crypto_alg *base = &alg->base;
 112
 113        base->cra_type = &crypto_akcipher_type;
 114        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 115        base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
 116}
 117
 118static int akcipher_default_op(struct akcipher_request *req)
 119{
 120        return -ENOSYS;
 121}
 122
 123int crypto_register_akcipher(struct akcipher_alg *alg)
 124{
 125        struct crypto_alg *base = &alg->base;
 126
 127        if (!alg->sign)
 128                alg->sign = akcipher_default_op;
 129        if (!alg->verify)
 130                alg->verify = akcipher_default_op;
 131        if (!alg->encrypt)
 132                alg->encrypt = akcipher_default_op;
 133        if (!alg->decrypt)
 134                alg->decrypt = akcipher_default_op;
 135
 136        akcipher_prepare_alg(alg);
 137        return crypto_register_alg(base);
 138}
 139EXPORT_SYMBOL_GPL(crypto_register_akcipher);
 140
 141void crypto_unregister_akcipher(struct akcipher_alg *alg)
 142{
 143        crypto_unregister_alg(&alg->base);
 144}
 145EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 146
 147int akcipher_register_instance(struct crypto_template *tmpl,
 148                               struct akcipher_instance *inst)
 149{
 150        if (WARN_ON(!inst->free))
 151                return -EINVAL;
 152        akcipher_prepare_alg(&inst->alg);
 153        return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
 154}
 155EXPORT_SYMBOL_GPL(akcipher_register_instance);
 156
 157MODULE_LICENSE("GPL");
 158MODULE_DESCRIPTION("Generic public key cipher type");
 159
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