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
crypto_akcipher_report(struct sk_buff * skb,struct crypto_alg * alg)24 static 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
crypto_akcipher_report(struct sk_buff * skb,struct crypto_alg * alg)36 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
37 {
38 return -ENOSYS;
39 }
40 #endif
41
42 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
43 __maybe_unused;
44
crypto_akcipher_show(struct seq_file * m,struct crypto_alg * alg)45 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
46 {
47 seq_puts(m, "type : akcipher\n");
48 }
49
crypto_akcipher_exit_tfm(struct crypto_tfm * tfm)50 static 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
crypto_akcipher_init_tfm(struct crypto_tfm * tfm)58 static 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
crypto_akcipher_free_instance(struct crypto_instance * inst)72 static 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
79 static 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
crypto_grab_akcipher(struct crypto_akcipher_spawn * spawn,const char * name,u32 type,u32 mask)93 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
94 u32 type, u32 mask)
95 {
96 spawn->base.frontend = &crypto_akcipher_type;
97 return crypto_grab_spawn(&spawn->base, name, type, mask);
98 }
99 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
100
crypto_alloc_akcipher(const char * alg_name,u32 type,u32 mask)101 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
102 u32 mask)
103 {
104 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
105 }
106 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
107
akcipher_prepare_alg(struct akcipher_alg * alg)108 static void akcipher_prepare_alg(struct akcipher_alg *alg)
109 {
110 struct crypto_alg *base = &alg->base;
111
112 base->cra_type = &crypto_akcipher_type;
113 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
114 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
115 }
116
akcipher_default_op(struct akcipher_request * req)117 static int akcipher_default_op(struct akcipher_request *req)
118 {
119 return -ENOSYS;
120 }
121
crypto_register_akcipher(struct akcipher_alg * alg)122 int crypto_register_akcipher(struct akcipher_alg *alg)
123 {
124 struct crypto_alg *base = &alg->base;
125
126 if (!alg->sign)
127 alg->sign = akcipher_default_op;
128 if (!alg->verify)
129 alg->verify = akcipher_default_op;
130 if (!alg->encrypt)
131 alg->encrypt = akcipher_default_op;
132 if (!alg->decrypt)
133 alg->decrypt = akcipher_default_op;
134
135 akcipher_prepare_alg(alg);
136 return crypto_register_alg(base);
137 }
138 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
139
crypto_unregister_akcipher(struct akcipher_alg * alg)140 void crypto_unregister_akcipher(struct akcipher_alg *alg)
141 {
142 crypto_unregister_alg(&alg->base);
143 }
144 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
145
akcipher_register_instance(struct crypto_template * tmpl,struct akcipher_instance * inst)146 int akcipher_register_instance(struct crypto_template *tmpl,
147 struct akcipher_instance *inst)
148 {
149 akcipher_prepare_alg(&inst->alg);
150 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
151 }
152 EXPORT_SYMBOL_GPL(akcipher_register_instance);
153
154 MODULE_LICENSE("GPL");
155 MODULE_DESCRIPTION("Generic public key cipher type");
156