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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef NET_SSL_SSL_CIPHER_SUITE_NAMES_H_ | |
6 #define NET_SSL_SSL_CIPHER_SUITE_NAMES_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "net/base/net_export.h" | |
12 | |
13 namespace net { | |
14 | |
15 // SSLCipherSuiteToStrings returns three strings for a given cipher suite | |
16 // number, the name of the key exchange algorithm, the name of the cipher and | |
17 // the name of the MAC. The cipher suite number is the number as sent on the | |
18 // wire and recorded at | |
19 // http://www.iana.org/assignments/tls-parameters/tls-parameters.xml | |
20 // If the cipher suite is unknown, the strings are set to "???". | |
21 // In the case of an AEAD cipher suite, *mac_str is NULL and *is_aead is true. | |
22 NET_EXPORT void SSLCipherSuiteToStrings(const char** key_exchange_str, | |
23 const char** cipher_str, | |
24 const char** mac_str, | |
25 bool* is_aead, | |
26 uint16 cipher_suite); | |
27 | |
28 // SSLVersionToString returns the name of the SSL protocol version | |
29 // specified by |ssl_version|, which is defined in | |
30 // net/ssl/ssl_connection_status_flags.h. | |
31 // If the version is unknown, |name| is set to "???". | |
32 NET_EXPORT void SSLVersionToString(const char** name, int ssl_version); | |
33 | |
34 // Parses a string literal that represents a SSL/TLS cipher suite. | |
35 // | |
36 // Supported literal forms: | |
37 // 0xAABB, where AA is cipher_suite[0] and BB is cipher_suite[1], as | |
38 // defined in RFC 2246, Section 7.4.1.2. Unrecognized but parsable cipher | |
39 // suites in this form will not return an error. | |
40 // | |
41 // Returns true if the cipher suite was successfully parsed, storing the | |
42 // result in |cipher_suite|. | |
43 // | |
44 // TODO(rsleevi): Support the full strings defined in the IANA TLS parameters | |
45 // list. | |
46 NET_EXPORT bool ParseSSLCipherString(const std::string& cipher_string, | |
47 uint16* cipher_suite); | |
48 | |
49 // |cipher_suite| is the IANA id for the cipher suite. What a "secure" | |
50 // cipher suite is arbitrarily determined here. The intent is to indicate what | |
51 // cipher suites meet modern security standards when backwards compatibility can | |
52 // be ignored. Notably, HTTP/2 requires/encourages this sort of validation of | |
53 // cipher suites: https://http2.github.io/http2-spec/#TLSUsage. | |
54 // | |
55 // Currently, this function follows these criteria: | |
56 // 1) Only uses forward secure key exchanges | |
57 // 2) Only uses AEADs | |
58 NET_EXPORT bool IsSecureTLSCipherSuite(uint16 cipher_suite); | |
59 | |
60 } // namespace net | |
61 | |
62 #endif // NET_SSL_SSL_CIPHER_SUITE_NAMES_H_ | |
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