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_PRIVATE bool IsSecureTLSCipherSuite(uint16 cipher_suite); 59 60 } // namespace net 61 62 #endif // NET_SSL_SSL_CIPHER_SUITE_NAMES_H_ 63
