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");