Made ec_c25519_m62 implementation the default on supported architectures.
[BearSSL] / src / ssl / ssl_ccert_single_ec.c
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
27 static void
28 cc_none0(const br_ssl_client_certificate_class **pctx)
29 {
30 (void)pctx;
31 }
32
33 static void
34 cc_none1(const br_ssl_client_certificate_class **pctx, size_t len)
35 {
36 (void)pctx;
37 (void)len;
38 }
39
40 static void
41 cc_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
49 static void
50 cc_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_ec_context *zc;
55 int x;
56 int scurve;
57
58 zc = (br_ssl_client_certificate_ec_context *)pctx;
59 scurve = br_ssl_client_get_server_curve(cc);
60
61 if ((zc->allowed_usages & BR_KEYTYPE_KEYX) != 0
62 && scurve == zc->sk->curve)
63 {
64 int x;
65
66 x = (zc->issuer_key_type == BR_KEYTYPE_RSA) ? 16 : 17;
67 if (((auth_types >> x) & 1) != 0) {
68 choices->auth_type = BR_AUTH_ECDH;
69 choices->hash_id = -1;
70 choices->chain = zc->chain;
71 choices->chain_len = zc->chain_len;
72 }
73 }
74
75 /*
76 * For ECDSA authentication, we must choose an appropriate
77 * hash function.
78 */
79 x = br_ssl_choose_hash((unsigned)(auth_types >> 8));
80 if (x == 0 || (zc->allowed_usages & BR_KEYTYPE_SIGN) == 0) {
81 memset(choices, 0, sizeof *choices);
82 return;
83 }
84 choices->auth_type = BR_AUTH_ECDSA;
85 choices->hash_id = x;
86 choices->chain = zc->chain;
87 choices->chain_len = zc->chain_len;
88 }
89
90 static uint32_t
91 cc_do_keyx(const br_ssl_client_certificate_class **pctx,
92 unsigned char *data, size_t *len)
93 {
94 br_ssl_client_certificate_ec_context *zc;
95 uint32_t r;
96 size_t xoff, xlen;
97
98 zc = (br_ssl_client_certificate_ec_context *)pctx;
99 r = zc->iec->mul(data, *len, zc->sk->x, zc->sk->xlen, zc->sk->curve);
100 xoff = zc->iec->xoff(zc->sk->curve, &xlen);
101 memmove(data, data + xoff, xlen);
102 *len = xlen;
103 return r;
104 }
105
106 static size_t
107 cc_do_sign(const br_ssl_client_certificate_class **pctx,
108 int hash_id, size_t hv_len, unsigned char *data, size_t len)
109 {
110 br_ssl_client_certificate_ec_context *zc;
111 unsigned char hv[64];
112 const br_hash_class *hc;
113
114 zc = (br_ssl_client_certificate_ec_context *)pctx;
115 memcpy(hv, data, hv_len);
116 hc = br_multihash_getimpl(zc->mhash, hash_id);
117 if (hc == NULL) {
118 return 0;
119 }
120 if (len < 139) {
121 return 0;
122 }
123 return zc->iecdsa(zc->iec, hc, hv, zc->sk, data);
124 }
125
126 static const br_ssl_client_certificate_class ccert_vtable = {
127 sizeof(br_ssl_client_certificate_ec_context),
128 cc_none0, /* start_name_list */
129 cc_none1, /* start_name */
130 cc_none2, /* append_name */
131 cc_none0, /* end_name */
132 cc_none0, /* end_name_list */
133 cc_choose,
134 cc_do_keyx,
135 cc_do_sign
136 };
137
138 /* see bearssl_ssl.h */
139 void
140 br_ssl_client_set_single_ec(br_ssl_client_context *cc,
141 const br_x509_certificate *chain, size_t chain_len,
142 const br_ec_private_key *sk, unsigned allowed_usages,
143 unsigned cert_issuer_key_type,
144 const br_ec_impl *iec, br_ecdsa_sign iecdsa)
145 {
146 cc->client_auth.single_ec.vtable = &ccert_vtable;
147 cc->client_auth.single_ec.chain = chain;
148 cc->client_auth.single_ec.chain_len = chain_len;
149 cc->client_auth.single_ec.sk = sk;
150 cc->client_auth.single_ec.allowed_usages = allowed_usages;
151 cc->client_auth.single_ec.issuer_key_type = cert_issuer_key_type;
152 cc->client_auth.single_ec.mhash = &cc->eng.mhash;
153 cc->client_auth.single_ec.iec = iec;
154 cc->client_auth.single_ec.iecdsa = iecdsa;
155 cc->client_auth_vtable = &cc->client_auth.single_ec.vtable;
156 }