aboutsummaryrefslogtreecommitdiff
path: root/crypto/sig.c
blob: 7645bedf3a1fd4b6703be78336132b218fac6c4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Public Key Signature Algorithm
 *
 * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/akcipher.h>
#include <crypto/internal/sig.h>
#include <linux/cryptouser.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>

#include "internal.h"

#define CRYPTO_ALG_TYPE_SIG_MASK	0x0000000e

static const struct crypto_type crypto_sig_type;

static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
{
	if (tfm->__crt_alg->cra_type != &crypto_sig_type)
		return crypto_init_akcipher_ops_sig(tfm);

	return 0;
}

static void __maybe_unused crypto_sig_show(struct seq_file *m,
					   struct crypto_alg *alg)
{
	seq_puts(m, "type         : sig\n");
}

static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
					    struct crypto_alg *alg)
{
	struct crypto_report_akcipher rsig = {};

	strscpy(rsig.type, "sig", sizeof(rsig.type));

	return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rsig), &rsig);
}

static const struct crypto_type crypto_sig_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_sig_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_sig_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
	.report = crypto_sig_report,
#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_SIG_MASK,
	.type = CRYPTO_ALG_TYPE_SIG,
	.tfmsize = offsetof(struct crypto_sig, base),
};

struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_sig);

int crypto_sig_maxsize(struct crypto_sig *tfm)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_maxsize(*ctx);
}
EXPORT_SYMBOL_GPL(crypto_sig_maxsize);

int crypto_sig_sign(struct crypto_sig *tfm,
		    const void *src, unsigned int slen,
		    void *dst, unsigned int dlen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	struct crypto_akcipher_sync_data data = {
		.tfm = *ctx,
		.src = src,
		.dst = dst,
		.slen = slen,
		.dlen = dlen,
	};

	return crypto_akcipher_sync_prep(&data) ?:
	       crypto_akcipher_sync_post(&data,
					 crypto_akcipher_sign(data.req));
}
EXPORT_SYMBOL_GPL(crypto_sig_sign);

int crypto_sig_verify(struct crypto_sig *tfm,
		      const void *src, unsigned int slen,
		      const void *digest, unsigned int dlen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	struct crypto_akcipher_sync_data data = {
		.tfm = *ctx,
		.src = src,
		.slen = slen,
		.dlen = dlen,
	};
	int err;

	err = crypto_akcipher_sync_prep(&data);
	if (err)
		return err;

	memcpy(data.buf + slen, digest, dlen);

	return crypto_akcipher_sync_post(&data,
					 crypto_akcipher_verify(data.req));
}
EXPORT_SYMBOL_GPL(crypto_sig_verify);

int crypto_sig_set_pubkey(struct crypto_sig *tfm,
			  const void *key, unsigned int keylen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_set_pub_key(*ctx, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_sig_set_pubkey);

int crypto_sig_set_privkey(struct crypto_sig *tfm,
			  const void *key, unsigned int keylen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_set_priv_key(*ctx, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_sig_set_privkey);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Public Key Signature Algorithms");