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/akcipher.h>
9#include <crypto/internal/sig.h>
10#include <linux/cryptouser.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/scatterlist.h>
14#include <linux/seq_file.h>
15#include <linux/string.h>
16#include <net/netlink.h>
17
18#include "internal.h"
19
20#define CRYPTO_ALG_TYPE_SIG_MASK 0x0000000e
21
22static const struct crypto_type crypto_sig_type;
23
24static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
25{
26 if (tfm->__crt_alg->cra_type != &crypto_sig_type)
27 return crypto_init_akcipher_ops_sig(tfm);
28
29 return 0;
30}
31
32static void __maybe_unused crypto_sig_show(struct seq_file *m,
33 struct crypto_alg *alg)
34{
35 seq_puts(m, s: "type : sig\n");
36}
37
38static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
39 struct crypto_alg *alg)
40{
41 struct crypto_report_akcipher rsig = {};
42
43 strscpy(rsig.type, "sig", sizeof(rsig.type));
44
45 return nla_put(skb, attrtype: CRYPTOCFGA_REPORT_AKCIPHER, attrlen: sizeof(rsig), data: &rsig);
46}
47
48static int __maybe_unused crypto_sig_report_stat(struct sk_buff *skb,
49 struct crypto_alg *alg)
50{
51 struct crypto_stat_akcipher rsig = {};
52
53 strscpy(rsig.type, "sig", sizeof(rsig.type));
54
55 return nla_put(skb, attrtype: CRYPTOCFGA_STAT_AKCIPHER, attrlen: sizeof(rsig), data: &rsig);
56}
57
58static const struct crypto_type crypto_sig_type = {
59 .extsize = crypto_alg_extsize,
60 .init_tfm = crypto_sig_init_tfm,
61#ifdef CONFIG_PROC_FS
62 .show = crypto_sig_show,
63#endif
64#if IS_ENABLED(CONFIG_CRYPTO_USER)
65 .report = crypto_sig_report,
66#endif
67#ifdef CONFIG_CRYPTO_STATS
68 .report_stat = crypto_sig_report_stat,
69#endif
70 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
71 .maskset = CRYPTO_ALG_TYPE_SIG_MASK,
72 .type = CRYPTO_ALG_TYPE_SIG,
73 .tfmsize = offsetof(struct crypto_sig, base),
74};
75
76struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
77{
78 return crypto_alloc_tfm(alg_name, frontend: &crypto_sig_type, type, mask);
79}
80EXPORT_SYMBOL_GPL(crypto_alloc_sig);
81
82int crypto_sig_maxsize(struct crypto_sig *tfm)
83{
84 struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
85
86 return crypto_akcipher_maxsize(tfm: *ctx);
87}
88EXPORT_SYMBOL_GPL(crypto_sig_maxsize);
89
90int crypto_sig_sign(struct crypto_sig *tfm,
91 const void *src, unsigned int slen,
92 void *dst, unsigned int dlen)
93{
94 struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
95 struct crypto_akcipher_sync_data data = {
96 .tfm = *ctx,
97 .src = src,
98 .dst = dst,
99 .slen = slen,
100 .dlen = dlen,
101 };
102
103 return crypto_akcipher_sync_prep(data: &data) ?:
104 crypto_akcipher_sync_post(data: &data,
105 err: crypto_akcipher_sign(req: data.req));
106}
107EXPORT_SYMBOL_GPL(crypto_sig_sign);
108
109int crypto_sig_verify(struct crypto_sig *tfm,
110 const void *src, unsigned int slen,
111 const void *digest, unsigned int dlen)
112{
113 struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
114 struct crypto_akcipher_sync_data data = {
115 .tfm = *ctx,
116 .src = src,
117 .slen = slen,
118 .dlen = dlen,
119 };
120 int err;
121
122 err = crypto_akcipher_sync_prep(data: &data);
123 if (err)
124 return err;
125
126 memcpy(data.buf + slen, digest, dlen);
127
128 return crypto_akcipher_sync_post(data: &data,
129 err: crypto_akcipher_verify(req: data.req));
130}
131EXPORT_SYMBOL_GPL(crypto_sig_verify);
132
133int crypto_sig_set_pubkey(struct crypto_sig *tfm,
134 const void *key, unsigned int keylen)
135{
136 struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
137
138 return crypto_akcipher_set_pub_key(tfm: *ctx, key, keylen);
139}
140EXPORT_SYMBOL_GPL(crypto_sig_set_pubkey);
141
142int crypto_sig_set_privkey(struct crypto_sig *tfm,
143 const void *key, unsigned int keylen)
144{
145 struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
146
147 return crypto_akcipher_set_priv_key(tfm: *ctx, key, keylen);
148}
149EXPORT_SYMBOL_GPL(crypto_sig_set_privkey);
150
151MODULE_LICENSE("GPL");
152MODULE_DESCRIPTION("Public Key Signature Algorithms");
153

source code of linux/crypto/sig.c