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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Public Key Signature Algorithm
4 *
5 * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/internal/sig.h>
9#include <linux/cryptouser.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/seq_file.h>
13#include <linux/string.h>
14#include <net/netlink.h>
15
16#include "internal.h"
17
18static void crypto_sig_exit_tfm(struct crypto_tfm *tfm)
19{
20 struct crypto_sig *sig = __crypto_sig_tfm(tfm);
21 struct sig_alg *alg = crypto_sig_alg(sig);
22
23 alg->exit(sig);
24}
25
26static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
27{
28 struct crypto_sig *sig = __crypto_sig_tfm(tfm);
29 struct sig_alg *alg = crypto_sig_alg(sig);
30
31 if (alg->exit)
32 sig->base.exit = crypto_sig_exit_tfm;
33
34 if (alg->init)
35 return alg->init(sig);
36
37 return 0;
38}
39
40static void crypto_sig_free_instance(struct crypto_instance *inst)
41{
42 struct sig_instance *sig = sig_instance(inst);
43
44 sig->free(sig);
45}
46
47static void __maybe_unused crypto_sig_show(struct seq_file *m,
48 struct crypto_alg *alg)
49{
50 seq_puts(m, "type : sig\n");
51}
52
53static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
54 struct crypto_alg *alg)
55{
56 struct crypto_report_sig rsig = {};
57
58 strscpy(rsig.type, "sig", sizeof(rsig.type));
59
60 return nla_put(skb, CRYPTOCFGA_REPORT_SIG, sizeof(rsig), &rsig);
61}
62
63static const struct crypto_type crypto_sig_type = {
64 .extsize = crypto_alg_extsize,
65 .init_tfm = crypto_sig_init_tfm,
66 .free = crypto_sig_free_instance,
67#ifdef CONFIG_PROC_FS
68 .show = crypto_sig_show,
69#endif
70#if IS_ENABLED(CONFIG_CRYPTO_USER)
71 .report = crypto_sig_report,
72#endif
73 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
74 .maskset = CRYPTO_ALG_TYPE_MASK,
75 .type = CRYPTO_ALG_TYPE_SIG,
76 .tfmsize = offsetof(struct crypto_sig, base),
77};
78
79struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
80{
81 return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
82}
83EXPORT_SYMBOL_GPL(crypto_alloc_sig);
84
85static int sig_default_sign(struct crypto_sig *tfm,
86 const void *src, unsigned int slen,
87 void *dst, unsigned int dlen)
88{
89 return -ENOSYS;
90}
91
92static int sig_default_verify(struct crypto_sig *tfm,
93 const void *src, unsigned int slen,
94 const void *dst, unsigned int dlen)
95{
96 return -ENOSYS;
97}
98
99static int sig_default_set_key(struct crypto_sig *tfm,
100 const void *key, unsigned int keylen)
101{
102 return -ENOSYS;
103}
104
105static int sig_prepare_alg(struct sig_alg *alg)
106{
107 struct crypto_alg *base = &alg->base;
108
109 if (!alg->sign)
110 alg->sign = sig_default_sign;
111 if (!alg->verify)
112 alg->verify = sig_default_verify;
113 if (!alg->set_priv_key)
114 alg->set_priv_key = sig_default_set_key;
115 if (!alg->set_pub_key)
116 return -EINVAL;
117 if (!alg->key_size)
118 return -EINVAL;
119 if (!alg->max_size)
120 alg->max_size = alg->key_size;
121 if (!alg->digest_size)
122 alg->digest_size = alg->key_size;
123
124 base->cra_type = &crypto_sig_type;
125 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
126 base->cra_flags |= CRYPTO_ALG_TYPE_SIG;
127
128 return 0;
129}
130
131int crypto_register_sig(struct sig_alg *alg)
132{
133 struct crypto_alg *base = &alg->base;
134 int err;
135
136 err = sig_prepare_alg(alg);
137 if (err)
138 return err;
139
140 return crypto_register_alg(base);
141}
142EXPORT_SYMBOL_GPL(crypto_register_sig);
143
144void crypto_unregister_sig(struct sig_alg *alg)
145{
146 crypto_unregister_alg(&alg->base);
147}
148EXPORT_SYMBOL_GPL(crypto_unregister_sig);
149
150int sig_register_instance(struct crypto_template *tmpl,
151 struct sig_instance *inst)
152{
153 int err;
154
155 if (WARN_ON(!inst->free))
156 return -EINVAL;
157
158 err = sig_prepare_alg(&inst->alg);
159 if (err)
160 return err;
161
162 return crypto_register_instance(tmpl, sig_crypto_instance(inst));
163}
164EXPORT_SYMBOL_GPL(sig_register_instance);
165
166int crypto_grab_sig(struct crypto_sig_spawn *spawn,
167 struct crypto_instance *inst,
168 const char *name, u32 type, u32 mask)
169{
170 spawn->base.frontend = &crypto_sig_type;
171 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
172}
173EXPORT_SYMBOL_GPL(crypto_grab_sig);
174
175MODULE_LICENSE("GPL");
176MODULE_DESCRIPTION("Public Key Signature Algorithms");