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