1/*
2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25#include "inner.h"
26
27static void
28cc_none0(const br_ssl_client_certificate_class **pctx)
29{
30	(void)pctx;
31}
32
33static void
34cc_none1(const br_ssl_client_certificate_class **pctx, size_t len)
35{
36	(void)pctx;
37	(void)len;
38}
39
40static void
41cc_none2(const br_ssl_client_certificate_class **pctx,
42	const unsigned char *data, size_t len)
43{
44	(void)pctx;
45	(void)data;
46	(void)len;
47}
48
49static void
50cc_choose(const br_ssl_client_certificate_class **pctx,
51	const br_ssl_client_context *cc, uint32_t auth_types,
52	br_ssl_client_certificate *choices)
53{
54	br_ssl_client_certificate_rsa_context *zc;
55	int x;
56
57	(void)cc;
58	zc = (br_ssl_client_certificate_rsa_context *)pctx;
59	x = br_ssl_choose_hash((unsigned)auth_types);
60	if (x == 0 && (auth_types & 1) == 0) {
61		memset(choices, 0, sizeof *choices);
62	}
63	choices->auth_type = BR_AUTH_RSA;
64	choices->hash_id = x;
65	choices->chain = zc->chain;
66	choices->chain_len = zc->chain_len;
67}
68
69/*
70 * OID for hash functions in RSA signatures.
71 */
72static const unsigned char HASH_OID_SHA1[] = {
73	0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
74};
75
76static const unsigned char HASH_OID_SHA224[] = {
77	0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
78};
79
80static const unsigned char HASH_OID_SHA256[] = {
81	0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
82};
83
84static const unsigned char HASH_OID_SHA384[] = {
85	0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
86};
87
88static const unsigned char HASH_OID_SHA512[] = {
89	0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
90};
91
92static const unsigned char *HASH_OID[] = {
93	HASH_OID_SHA1,
94	HASH_OID_SHA224,
95	HASH_OID_SHA256,
96	HASH_OID_SHA384,
97	HASH_OID_SHA512
98};
99
100static size_t
101cc_do_sign(const br_ssl_client_certificate_class **pctx,
102	int hash_id, size_t hv_len, unsigned char *data, size_t len)
103{
104	br_ssl_client_certificate_rsa_context *zc;
105	unsigned char hv[64];
106	const unsigned char *hash_oid;
107	size_t sig_len;
108
109	zc = (br_ssl_client_certificate_rsa_context *)pctx;
110	memcpy(hv, data, hv_len);
111	if (hash_id == 0) {
112		hash_oid = NULL;
113	} else if (hash_id >= 2 && hash_id <= 6) {
114		hash_oid = HASH_OID[hash_id - 2];
115	} else {
116		return 0;
117	}
118	sig_len = (zc->sk->n_bitlen + 7) >> 3;
119	if (len < sig_len) {
120		return 0;
121	}
122	return zc->irsasign(hash_oid, hv, hv_len, zc->sk, data) ? sig_len : 0;
123}
124
125static const br_ssl_client_certificate_class ccert_vtable = {
126	sizeof(br_ssl_client_certificate_rsa_context),
127	cc_none0, /* start_name_list */
128	cc_none1, /* start_name */
129	cc_none2, /* append_name */
130	cc_none0, /* end_name */
131	cc_none0, /* end_name_list */
132	cc_choose,
133	0,
134	cc_do_sign
135};
136
137/* see bearssl_ssl.h */
138void
139br_ssl_client_set_single_rsa(br_ssl_client_context *cc,
140	const br_x509_certificate *chain, size_t chain_len,
141	const br_rsa_private_key *sk, br_rsa_pkcs1_sign irsasign)
142{
143	cc->client_auth.single_rsa.vtable = &ccert_vtable;
144	cc->client_auth.single_rsa.chain = chain;
145	cc->client_auth.single_rsa.chain_len = chain_len;
146	cc->client_auth.single_rsa.sk = sk;
147	cc->client_auth.single_rsa.irsasign = irsasign;
148	cc->client_auth_vtable = &cc->client_auth.single_rsa.vtable;
149}
150