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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 | |
29 | static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
30 | { | |
31 | struct crypto_report_akcipher rakcipher; | |
32 | ||
33 | memset(&rakcipher, 0, sizeof(rakcipher)); | |
34 | ||
35 | strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); | |
36 | ||
37 | return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, | |
38 | sizeof(rakcipher), &rakcipher); | |
39 | } | |
40 | #else | |
41 | static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
42 | { | |
43 | return -ENOSYS; | |
44 | } | |
45 | #endif | |
46 | ||
47 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
48 | __maybe_unused; | |
49 | ||
50 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
51 | { | |
52 | seq_puts(m, "type : akcipher\n"); | |
53 | } | |
54 | ||
55 | static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) | |
56 | { | |
57 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); | |
58 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); | |
59 | ||
60 | alg->exit(akcipher); | |
61 | } | |
62 | ||
63 | static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) | |
64 | { | |
65 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); | |
66 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); | |
67 | ||
68 | if (alg->exit) | |
69 | akcipher->base.exit = crypto_akcipher_exit_tfm; | |
70 | ||
71 | if (alg->init) | |
72 | return alg->init(akcipher); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static void crypto_akcipher_free_instance(struct crypto_instance *inst) | |
78 | { | |
79 | struct akcipher_instance *akcipher = akcipher_instance(inst); | |
80 | ||
81 | akcipher->free(akcipher); | |
82 | } | |
83 | ||
84 | static const struct crypto_type crypto_akcipher_type = { | |
85 | .extsize = crypto_alg_extsize, | |
86 | .init_tfm = crypto_akcipher_init_tfm, | |
87 | .free = crypto_akcipher_free_instance, | |
88 | #ifdef CONFIG_PROC_FS | |
89 | .show = crypto_akcipher_show, | |
90 | #endif | |
91 | .report = crypto_akcipher_report, | |
92 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
93 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
94 | .type = CRYPTO_ALG_TYPE_AKCIPHER, | |
95 | .tfmsize = offsetof(struct crypto_akcipher, base), | |
96 | }; | |
97 | ||
98 | int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name, | |
99 | u32 type, u32 mask) | |
100 | { | |
101 | spawn->base.frontend = &crypto_akcipher_type; | |
102 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(crypto_grab_akcipher); | |
105 | ||
106 | struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, | |
107 | u32 mask) | |
108 | { | |
109 | return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); | |
112 | ||
113 | static void akcipher_prepare_alg(struct akcipher_alg *alg) | |
114 | { | |
115 | struct crypto_alg *base = &alg->base; | |
116 | ||
117 | base->cra_type = &crypto_akcipher_type; | |
118 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
119 | base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; | |
120 | } | |
121 | ||
122 | static int akcipher_default_op(struct akcipher_request *req) | |
123 | { | |
124 | return -ENOSYS; | |
125 | } | |
126 | ||
127 | int crypto_register_akcipher(struct akcipher_alg *alg) | |
128 | { | |
129 | struct crypto_alg *base = &alg->base; | |
130 | ||
131 | if (!alg->sign) | |
132 | alg->sign = akcipher_default_op; | |
133 | if (!alg->verify) | |
134 | alg->verify = akcipher_default_op; | |
135 | if (!alg->encrypt) | |
136 | alg->encrypt = akcipher_default_op; | |
137 | if (!alg->decrypt) | |
138 | alg->decrypt = akcipher_default_op; | |
139 | ||
140 | akcipher_prepare_alg(alg); | |
141 | return crypto_register_alg(base); | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(crypto_register_akcipher); | |
144 | ||
145 | void crypto_unregister_akcipher(struct akcipher_alg *alg) | |
146 | { | |
147 | crypto_unregister_alg(&alg->base); | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); | |
150 | ||
151 | int akcipher_register_instance(struct crypto_template *tmpl, | |
152 | struct akcipher_instance *inst) | |
153 | { | |
154 | akcipher_prepare_alg(&inst->alg); | |
155 | return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(akcipher_register_instance); | |
158 | ||
159 | MODULE_LICENSE("GPL"); | |
160 | MODULE_DESCRIPTION("Generic public key cipher type"); |