File Coverage

src/ssl/ssl_keyexport.c

Criterion	Covered	Total	%
statement	0	23	0.0
branch	0	8	0.0
condition			n/a
subroutine			n/a
pod			n/a
total	0	31	0.0

line	stmt	bran	code
1			/*
2			* Copyright (c) 2017 Thomas Pornin
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			/*
28			* Supported cipher suites that use SHA-384 for the PRF when selected
29			* for TLS 1.2. All other cipher suites are deemed to use SHA-256.
30			*/
31			static const uint16_t suites_sha384[] = {
32			BR_TLS_RSA_WITH_AES_256_GCM_SHA384,
33			BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
34			BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,
35			BR_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
36			BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,
37			BR_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
38			BR_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,
39			BR_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
40			BR_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
41			};
42
43			/* see bearssl_ssl.h */
44			int
45	0		br_ssl_key_export(br_ssl_engine_context *cc,
46			void dst, size_t len, const char label,
47			const void *context, size_t context_len)
48			{
49			br_tls_prf_seed_chunk chunks[4];
50			br_tls_prf_impl iprf;
51			size_t num_chunks, u;
52			unsigned char tmp[2];
53			int prf_id;
54
55	0	0	if (cc->application_data != 1) {
56	0		return 0;
57			}
58	0		chunks[0].data = cc->client_random;
59	0		chunks[0].len = sizeof cc->client_random;
60	0		chunks[1].data = cc->server_random;
61	0		chunks[1].len = sizeof cc->server_random;
62	0	0	if (context != NULL) {
63	0		br_enc16be(tmp, (unsigned)context_len);
64	0		chunks[2].data = tmp;
65	0		chunks[2].len = 2;
66	0		chunks[3].data = context;
67	0		chunks[3].len = context_len;
68	0		num_chunks = 4;
69			} else {
70	0		num_chunks = 2;
71			}
72	0		prf_id = BR_SSLPRF_SHA256;
73	0	0	for (u = 0; u < (sizeof suites_sha384) / sizeof(uint16_t); u ++) {
74	0	0	if (suites_sha384[u] == cc->session.cipher_suite) {
75	0		prf_id = BR_SSLPRF_SHA384;
76			}
77			}
78	0		iprf = br_ssl_engine_get_PRF(cc, prf_id);
79	0		iprf(dst, len,
80	0		cc->session.master_secret, sizeof cc->session.master_secret,
81			label, num_chunks, chunks);
82	0		return 1;
83			}