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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"
/* see bearssl_ssl.h */
void
br_ssl_client_init_full(br_ssl_client_context *cc,
br_x509_minimal_context *xc,
const br_x509_trust_anchor *trust_anchors, size_t trust_anchors_num)
{
/*
* The "full" profile supports all implemented cipher suites.
*
* Rationale for suite order, from most important to least
* important rule:
*
* -- Don't use 3DES if AES or ChaCha20 is available.
* -- Try to have Forward Secrecy (ECDHE suite) if possible.
* -- When not using Forward Secrecy, ECDH key exchange is
* better than RSA key exchange (slightly more expensive on the
* client, but much cheaper on the server, and it implies smaller
* messages).
* -- ChaCha20+Poly1305 is better than AES/GCM (faster, smaller code).
* -- GCM is better than CCM and CBC. CCM is better than CBC.
* -- CCM is preferable over CCM_8 (with CCM_8, forgeries may succeed
* with probability 2^(-64)).
* -- AES-128 is preferred over AES-256 (AES-128 is already
* strong enough, and AES-256 is 40% more expensive).
*/
static const uint16_t suites[] = {
BR_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
BR_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
BR_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
BR_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
BR_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
BR_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
BR_TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
BR_TLS_ECDHE_ECDSA_WITH_AES_256_CCM,
BR_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8,
BR_TLS_ECDHE_ECDSA_WITH_AES_256_CCM_8,
BR_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
BR_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
BR_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
BR_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
BR_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
BR_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
BR_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
BR_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
BR_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,
BR_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384,
BR_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
BR_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,
BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,
BR_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
BR_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
BR_TLS_RSA_WITH_AES_128_GCM_SHA256,
BR_TLS_RSA_WITH_AES_256_GCM_SHA384,
BR_TLS_RSA_WITH_AES_128_CCM,
BR_TLS_RSA_WITH_AES_256_CCM,
BR_TLS_RSA_WITH_AES_128_CCM_8,
BR_TLS_RSA_WITH_AES_256_CCM_8,
BR_TLS_RSA_WITH_AES_128_CBC_SHA256,
BR_TLS_RSA_WITH_AES_256_CBC_SHA256,
BR_TLS_RSA_WITH_AES_128_CBC_SHA,
BR_TLS_RSA_WITH_AES_256_CBC_SHA,
BR_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
BR_TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
BR_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
BR_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
BR_TLS_RSA_WITH_3DES_EDE_CBC_SHA
};
/*
* All hash functions are activated.
* Note: the X.509 validation engine will nonetheless refuse to
* validate signatures that use MD5 as hash function.
*/
static const br_hash_class *hashes[] = {
&br_md5_vtable,
&br_sha1_vtable,
&br_sha224_vtable,
&br_sha256_vtable,
&br_sha384_vtable,
&br_sha512_vtable
};
int id;
/*
* Reset client context and set supported versions from TLS-1.0
* to TLS-1.2 (inclusive).
*/
br_ssl_client_zero(cc);
br_ssl_engine_set_versions(&cc->eng, BR_TLS10, BR_TLS12);
/*
* X.509 engine uses SHA-256 to hash certificate DN (for
* comparisons).
*/
br_x509_minimal_init(xc, &br_sha256_vtable,
trust_anchors, trust_anchors_num);
/*
* Set suites and asymmetric crypto implementations. We use the
* "i31" code for RSA (it is somewhat faster than the "i32"
* implementation).
* TODO: change that when better implementations are made available.
*/
br_ssl_engine_set_suites(&cc->eng, suites,
(sizeof suites) / (sizeof suites[0]));
br_ssl_client_set_default_rsapub(cc);
br_ssl_engine_set_default_rsavrfy(&cc->eng);
br_ssl_engine_set_default_ecdsa(&cc->eng);
br_x509_minimal_set_rsa(xc, br_ssl_engine_get_rsavrfy(&cc->eng));
br_x509_minimal_set_ecdsa(xc,
br_ssl_engine_get_ec(&cc->eng),
br_ssl_engine_get_ecdsa(&cc->eng));
/*
* Set supported hash functions, for the SSL engine and for the
* X.509 engine.
*/
for (id = br_md5_ID; id <= br_sha512_ID; id ++) {
const br_hash_class *hc;
hc = hashes[id - 1];
br_ssl_engine_set_hash(&cc->eng, id, hc);
br_x509_minimal_set_hash(xc, id, hc);
}
/*
* Link the X.509 engine in the SSL engine.
*/
br_ssl_engine_set_x509(&cc->eng, &xc->vtable);
/*
* Set the PRF implementations.
*/
br_ssl_engine_set_prf10(&cc->eng, &br_tls10_prf);
br_ssl_engine_set_prf_sha256(&cc->eng, &br_tls12_sha256_prf);
br_ssl_engine_set_prf_sha384(&cc->eng, &br_tls12_sha384_prf);
/*
* Symmetric encryption. We use the "default" implementations
* (fastest among constant-time implementations).
*/
br_ssl_engine_set_default_aes_cbc(&cc->eng);
br_ssl_engine_set_default_aes_ccm(&cc->eng);
br_ssl_engine_set_default_aes_gcm(&cc->eng);
br_ssl_engine_set_default_des_cbc(&cc->eng);
br_ssl_engine_set_default_chapol(&cc->eng);
}
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