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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
static void
cc_none0(const br_ssl_client_certificate_class **pctx)
{
(void)pctx;
}
static void
cc_none1(const br_ssl_client_certificate_class **pctx, size_t len)
{
(void)pctx;
(void)len;
}
static void
cc_none2(const br_ssl_client_certificate_class **pctx,
const unsigned char *data, size_t len)
{
(void)pctx;
(void)data;
(void)len;
}
static void
cc_choose(const br_ssl_client_certificate_class **pctx,
const br_ssl_client_context *cc, uint32_t auth_types,
br_ssl_client_certificate *choices)
{
br_ssl_client_certificate_ec_context *zc;
int x;
int scurve;
zc = (br_ssl_client_certificate_ec_context *)pctx;
scurve = br_ssl_client_get_server_curve(cc);
if ((zc->allowed_usages & BR_KEYTYPE_KEYX) != 0
&& scurve == zc->sk->curve)
{
int x;
x = (zc->issuer_key_type == BR_KEYTYPE_RSA) ? 16 : 17;
if (((auth_types >> x) & 1) != 0) {
choices->auth_type = BR_AUTH_ECDH;
choices->hash_id = -1;
choices->chain = zc->chain;
choices->chain_len = zc->chain_len;
}
}
/*
* For ECDSA authentication, we must choose an appropriate
* hash function.
*/
x = br_ssl_choose_hash((unsigned)(auth_types >> 8));
if (x == 0 || (zc->allowed_usages & BR_KEYTYPE_SIGN) == 0) {
memset(choices, 0, sizeof *choices);
return;
}
choices->auth_type = BR_AUTH_ECDSA;
choices->hash_id = x;
choices->chain = zc->chain;
choices->chain_len = zc->chain_len;
}
static uint32_t
cc_do_keyx(const br_ssl_client_certificate_class **pctx,
unsigned char *data, size_t *len)
{
br_ssl_client_certificate_ec_context *zc;
uint32_t r;
size_t xoff, xlen;
zc = (br_ssl_client_certificate_ec_context *)pctx;
r = zc->iec->mul(data, *len, zc->sk->x, zc->sk->xlen, zc->sk->curve);
xoff = zc->iec->xoff(zc->sk->curve, &xlen);
memmove(data, data + xoff, xlen);
*len = xlen;
return r;
}
static size_t
cc_do_sign(const br_ssl_client_certificate_class **pctx,
int hash_id, size_t hv_len, unsigned char *data, size_t len)
{
br_ssl_client_certificate_ec_context *zc;
unsigned char hv[64];
const br_hash_class *hc;
zc = (br_ssl_client_certificate_ec_context *)pctx;
memcpy(hv, data, hv_len);
hc = br_multihash_getimpl(zc->mhash, hash_id);
if (hc == NULL) {
return 0;
}
if (len < 139) {
return 0;
}
return zc->iecdsa(zc->iec, hc, hv, zc->sk, data);
}
static const br_ssl_client_certificate_class ccert_vtable = {
sizeof(br_ssl_client_certificate_ec_context),
cc_none0, /* start_name_list */
cc_none1, /* start_name */
cc_none2, /* append_name */
cc_none0, /* end_name */
cc_none0, /* end_name_list */
cc_choose,
cc_do_keyx,
cc_do_sign
};
/* see bearssl_ssl.h */
void
br_ssl_client_set_single_ec(br_ssl_client_context *cc,
const br_x509_certificate *chain, size_t chain_len,
const br_ec_private_key *sk, unsigned allowed_usages,
unsigned cert_issuer_key_type,
const br_ec_impl *iec, br_ecdsa_sign iecdsa)
{
cc->client_auth.single_ec.vtable = &ccert_vtable;
cc->client_auth.single_ec.chain = chain;
cc->client_auth.single_ec.chain_len = chain_len;
cc->client_auth.single_ec.sk = sk;
cc->client_auth.single_ec.allowed_usages = allowed_usages;
cc->client_auth.single_ec.issuer_key_type = cert_issuer_key_type;
cc->client_auth.single_ec.mhash = &cc->eng.mhash;
cc->client_auth.single_ec.iec = iec;
cc->client_auth.single_ec.iecdsa = iecdsa;
cc->client_auth_vtable = &cc->client_auth.single_ec.vtable;
}
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