84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "t_inner.h"
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/*
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* Supported cipher suites that use SHA-384 for the PRF when selected
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* for TLS 1.2. All other cipher suites are deemed to use SHA-256.
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*/
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static const uint16_t suites_sha384[] PROGMEM = {
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BR_TLS_RSA_WITH_AES_256_GCM_SHA384,
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BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
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BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,
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BR_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
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BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,
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BR_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
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BR_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,
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BR_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
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BR_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
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};
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/* see bearssl_ssl.h */
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int
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br_ssl_key_export(br_ssl_engine_context *cc,
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void *dst, size_t len, const char *label,
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const void *context, size_t context_len)
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{
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br_tls_prf_seed_chunk chunks[4];
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br_tls_prf_impl iprf;
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size_t num_chunks, u;
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unsigned char tmp[2];
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int prf_id;
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if (cc->application_data != 1) {
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return 0;
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}
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chunks[0].data = cc->client_random;
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chunks[0].len = sizeof cc->client_random;
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chunks[1].data = cc->server_random;
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chunks[1].len = sizeof cc->server_random;
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if (context != NULL) {
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br_enc16be(tmp, (unsigned)context_len);
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chunks[2].data = tmp;
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chunks[2].len = 2;
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chunks[3].data = context;
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chunks[3].len = context_len;
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num_chunks = 4;
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} else {
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num_chunks = 2;
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}
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prf_id = BR_SSLPRF_SHA256;
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for (u = 0; u < (sizeof suites_sha384) / sizeof(uint16_t); u ++) {
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if (pgm_read_word(&suites_sha384[u]) == cc->session.cipher_suite) {
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prf_id = BR_SSLPRF_SHA384;
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}
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}
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iprf = br_ssl_engine_get_PRF(cc, prf_id);
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iprf(dst, len,
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cc->session.master_secret, sizeof cc->session.master_secret,
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label, num_chunks, chunks);
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return 1;
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}
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