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");